11 jobs found

Senior Mobile QA Engineer (iOS & Android) 350 to 400 per day Outside IR35 Initial 6-Month Contract Hybrid (Stratford, London) Immediate Start Available Our trusted partner within the Ed-Tech sector, employing over 10,000 people across 100 countries and supporting more than 600 million users globally, is seeking an experienced Senior Mobile QA Engineer to join a high-profile product engineering team developing innovative mobile learning applications. This role is ideal for a QA professional with extensive experience testing native and cross-platform mobile applications across iOS and Android environments, coupled with a strong background in test automation and modern Agile delivery practices. Key Responsibilities Lead quality assurance activities across mobile applications, ensuring exceptional user experience on both iOS and Android platforms. Develop and execute comprehensive test strategies, test plans and test cases. Design, implement and maintain automated testing frameworks and tooling. Perform functional, regression, exploratory, performance, usability and compliance testing. Collaborate closely with Product Owners, Developers and Infrastructure teams throughout the SDLC. Identify, document and manage defects through to resolution. Support continuous improvement of QA processes, automation capabilities and CI/CD practices. Provide guidance on mobile testing best practices, device compatibility and platform-specific considerations. Essential Skills & Experience Proven experience as a Senior QA Engineer within a mobile application environment. Extensive testing experience across iOS and Android platforms. Strong hands-on experience with mobile automation tools such as Appium, Cypress, Selenium or Playwright. Experience testing APIs and backend services supporting mobile applications. Strong understanding of Agile delivery methodologies. Experience building and maintaining automated test suites. Knowledge of CI/CD pipelines and modern software delivery practices. Excellent communication and stakeholder management skills. Highly Desirable Experience testing AI-powered applications, conversational interfaces or chatbots. Experience with Python and/or TypeScript. Experience testing voice-enabled applications. Experience within Ed-Tech, Education, SaaS or Product-led organisations. Exposure to AWS cloud environments. Experience with performance, security or compliance testing. The interview process consists of two remote stages with the opportunity to start immediately.

Senior Full Stack Engineer 85,000 to 105,000 Permanent Remote, with occasional London office visits The opportunity Our client is hiring a Senior Full Stack Engineer to take ownership of building the next generation of customer-facing software in the energy market. The business operates in a complex, high-value sector and is using technology, data, and strong product thinking to modernise an industry that has historically been underserved by great software. We have already recruited 4 people into the business, and all 4 are still there. We know the company and team well and are pleased to be supporting them again on this important hire. This is a genuinely high-impact opportunity for an experienced engineer who is equally comfortable across frontend and backend development. You will take the lead on building new products and developing the codebase, with significant autonomy over technical decisions, architecture, and delivery. The position can be fully remote, although the business would welcome occasional visits to its Mayfair office for collaboration and team time. The role This is a true full stack position. They need someone strong in React and TypeScript who can build polished, reliable customer-facing software, but who is equally capable of contributing across backend services, APIs, application logic, databases, and data-rich workflows. The platform supports complex energy processes across areas such as billing, metering, consumption, reporting, and asset performance. You will be responsible for taking those workflows and turning them into clear, scalable products that customers genuinely value. Initially, you will lead much of the engineering work independently. You will not, however, be expected to operate without support. The business can provide access to external engineering expertise and additional coding support where needed as the platform and codebase develop. This role offers genuine autonomy. You will have the freedom to make sensible technical decisions, shape engineering standards, and influence how the product evolves as the company grows. What you will be doing Leading the development of customer-facing products from initial concept through to production Building modern frontend applications using React and TypeScript Designing and developing backend services, APIs, integrations, and application logic Working with Python, SQL, databases, and data platforms Taking ownership of architecture, technical decisions, and engineering standards Helping define the future engineering team and technical direction as the business expands What they are looking for Strong commercial experience across both frontend and backend engineering Excellent React and TypeScript capability Strong backend development experience, ideally including Python Good experience with APIs, databases, SQL, and system integrations A track record of leading projects or taking ownership of major technical workstreams Experience building customer-facing software from scratch Strong product instincts and the ability to think beyond individual tickets Confidence making technical decisions and working with a high level of autonomy Excellent communication skills and the ability to work closely with technical and non-technical stakeholders Personality and attitude are particularly important. They want someone positive, proactive, collaborative, and genuinely enthusiastic about building great software. The right person will bring energy to the team, take responsibility, and approach challenges with a practical and constructive mindset. Nice to have Startup or scale-up experience Energy, utilities, trading, sustainability, or fintech experience Data visualisation experience Experience working with Databricks or similar data platforms Experience using AI-assisted development tools Previous involvement in shaping engineering teams, standards, or architecture Why join A salary of 85,000 to 105,000 + Bonus The flexibility to work remotely Occasional collaboration from the Mayfair office Real autonomy over what gets built and how it is delivered Support from external engineering resources when required Broad exposure across frontend, backend, data, architecture, and product Long-term scope to help build and shape the engineering function A growing business operating in a complex and important energy market Summary This is an excellent opportunity for a Senior Full Stack Engineer who wants meaningful ownership rather than simply maintaining an established platform. You will lead the development of customer-facing software, work across React, TypeScript, Python, APIs, databases, and data-rich systems, and have the autonomy to shape the technical direction of a growing energy business. They are looking for someone technically strong, but equally importantly, someone with an excellent attitude who is positive, engaging, and excited by the opportunity to build.

Site Reliability Engineer (GCP & Kubernetes) London (Hybrid, 2 days onsite per week) 6-Month Contract Inside IR35 Competitive Day Rate We are looking for an experienced Site Reliability Engineer (SRE) to join a high-performing technology team responsible for building, securing, and operating cloud-native platforms that support innovative AI-driven applications. This is a key role focused on cloud infrastructure development, platform reliability, security hardening, and operational excellence . You will work closely with software engineers, platform teams, and technical stakeholders to design, deploy, and maintain resilient production systems capable of supporting complex and scalable workloads. You will be responsible for the reliability, performance, scalability, and security of cloud-based applications and infrastructure, ensuring services are delivered efficiently and operate effectively in production environments. Key Responsibilities: Design, build, and maintain cloud infrastructure within Google Cloud Platform (GCP). Deploy, manage, and optimise Kubernetes-based environments and containerised applications. Develop and support backend services and operational tooling using Python. Create and maintain Infrastructure as Code using Terraform. Implement security hardening, monitoring, observability, and reliability best practices across cloud platforms. Troubleshoot and resolve complex production issues, ensuring minimal service disruption. Develop and improve CI/CD pipelines to enable efficient and reliable software delivery. Work closely with development teams to improve platform resilience, scalability, and operational performance. Implement monitoring, alerting, and incident response processes to support production systems. Drive automation initiatives to reduce operational overhead and improve system reliability. We're Looking For: Proven experience as a Site Reliability Engineer, Platform Engineer, Cloud Engineer, or DevOps Engineer . Strong hands-on experience with Google Cloud Platform (GCP) . Experience deploying, operating, and supporting production cloud applications at scale . Strong knowledge of Kubernetes and container orchestration technologies. Commercial experience developing with Python . Experience building and supporting backend services and APIs, ideally using FastAPI . Strong knowledge of Terraform and Infrastructure as Code principles. Experience designing highly available, resilient, and secure cloud environments. Strong troubleshooting and incident management skills within production environments. Experience with CI/CD pipelines, Git, GitHub, and DevOps best practices . Strong understanding of cloud networking concepts, with particular emphasis on GCP networking . Ability to take ownership of production systems and drive continuous improvement initiatives. Desirable: Microsoft Azure experience. Experience deploying and supporting AI/ML applications in production environments. Exposure to Large Language Models (LLMs), NLP, or agent-based systems. Experience with observability and monitoring tools such as Sentry , Prometheus, Grafana, or similar platforms. Strong Docker and multi-container application architecture experience. Experience working within scientific, pharmaceutical, genomics, or bioinformatics environments. Start-up or high-growth technology company experience. Open-source software contributions. Technical leadership, mentoring, or coaching experience. Contract Details: 6-Month Initial Contract Inside IR35 London-based Hybrid Working (2 days onsite per week) Competitive Day Rate Potential extension opportunities The Opportunity This role offers the chance to work on modern cloud-native systems supporting innovative AI-enabled technologies. You'll be part of a collaborative engineering environment where reliability, automation, security, and scalability are key priorities, with the opportunity to make a significant impact on critical production platforms. If you're a Site Reliability Engineer or Platform Engineer with strong GCP, Kubernetes, Terraform, and Python experience, we'd love to hear from you.

Senior Backend Developer (Python) Remote Contract Remote Contract Start: September 2026 We're recruiting for an experienced Senior Backend Developer to join a high-profile international technology programme focused on building scalable, data-driven applications. This is an exciting opportunity to work on modern backend architecture, processing complex geospatial and temporal data within a collaborative engineering environment. This is a hands-on role where you'll take ownership of features from design through deployment, working closely with architects, data engineers and software developers to deliver robust, production-grade solutions. What you'll be doing Design and develop scalable backend services using Python and FastAPI Build RESTful APIs and microservices Develop data pipelines supporting large-scale analytics platforms Work with Neo4j graph databases and relational databases such as PostgreSQL or SQL Server Collaborate with cross-functional engineering teams to design clean, maintainable software using Domain-Driven Design (DDD) Write high-quality, well-tested code and contribute to code reviews Support CI/CD pipelines, containerised deployments and cloud-native development Troubleshoot performance issues and contribute to architectural decisions Essential Skills & Experience Strong commercial experience with Python Production experience with FastAPI Solid understanding of REST APIs and microservice architectures Experience applying Domain-Driven Design (DDD) Strong SQL skills with PostgreSQL and/or SQL Server Hands-on experience with Neo4j graph databases Experience working with Docker and Kubernetes Knowledge of CI/CD pipelines and Git Understanding of secure software development principles Excellent communication skills and experience working within Agile teams Desirable Experience Databricks Microsoft Azure Event-driven architectures (Kafka, MQTT, Azure Event Hubs, etc.) Geospatial or time-series data Observability tools such as Prometheus, Grafana or OpenTelemetry Eligibility Due to project requirements, applicants must be citizens of a NATO member country and currently reside within a NATO member country. Contract Details Fully remote Start: September 2026 Initial contract through December 2026, with potential for extension International engineering programme Opportunity to work with modern technologies on technically challenging projects If you're an experienced Python Backend Developer looking to work on large-scale distributed systems using modern engineering practices, we'd love to hear from you. Apply today with your latest CV for a confidential discussion.

Founding Engineer Cambridge Hybrid 70,000- 80,000 + Equity Tech stack: Python (FastAPI) - the bread & butter! React & TypeScript PostgreSQL Azure Docker AI / LLMs Some startups are trying to make meetings 3% more efficient. This one is tackling a problem that affects millions of people every day, even if they never realise it. We're working with a AI-native startup building software for one of the UK's most complex and highly regulated industries. Their platform is already live, solving real customer problems, and they're now looking for a Founding Engineer to help scale both the product and the business. This isn't joining a team of 50 engineers. It's joining a small, exceptionally bright group where your decisions will influence the product, architecture and engineering culture for years to come. You'll spend as much time solving problems as you do writing code. One morning might involve designing a new backend service. The afternoon could be spent working alongside customers to understand how they actually use the product before shipping improvements into production. You'll be expected to work backwards from user problems, challenge assumptions, and help decide what should be built in the first place. You'll be responsible for: Building scalable backend systems using Python and FastAPI. Designing clean APIs, data models and software architecture that will stand the test of time. Building AI-powered product features that deliver real value in production. Working across the stack with React and TypeScript where appropriate. Helping shape engineering standards, tooling and technical direction as one of the earliest hires. They're looking for someone who: Loves building products from zero to one. Has strong commercial Python experience and enjoys designing well-structured systems. Has worked with LLMs or AI features in production (rather than simply experimenting). Enjoys operating with ambiguity and taking ownership without waiting for perfect requirements. Thinks about users and product outcomes just as much as technical implementation. Wants to help build an engineering culture, not just contribute to one. Why join? Become one of the earliest engineers in a genuinely mission-driven AI company. Work on software with measurable real-world impact across critical infrastructure. Join an exceptionally strong founding team with a very high technical bar. Shape product, architecture and engineering culture from an early stage. Meaningful equity alongside a competitive salary. Greenfield thinking, high ownership and the opportunity to build something that genuinely matters. If you're excited by difficult engineering problems, real ownership, and building AI products that have genuine impact beyond another productivity tool, I'd love to tell you more. Apply via this advert or drop me an email at .

Software Engineer Location: Hybrid / Remote (UK-based) Team: Engineering Salary: Up to £45,000 Reports to: VP of Engineering About Our Client Our client is one of Europe's fastest-growing software companies, on a mission to solve productivity problems for people-intensive industries using AI and automation. Since being founded, they've focused on automating the manual, tedious parts of complex workflows consolidating entire industries' work into one sleek, integrated platform. Building alongside cutting-edge LLMs, they're pushing the boundaries of what AI agents can do in the real world. They've been recognised as one of the best places to work in the UK, and they take that seriously: pursuing innovation, championing employee wellbeing, and offering fast-paced growth in a supportive, transatlantic culture. Their engineering team is a group of thoughtful, collaborative professionals who care about quality, continuous improvement, and meaningful product outcomes not just output. As they enter their next stage of growth, they're looking for a talented Software Engineer to help build a platform used all day, every working day, by thousands of people. The Role You'll join a high-performing, collaborative engineering team building a product that modern industry professionals rely on constantly. This is a startup with high standards, where engineers are trusted owners, strong collaborators, and thoughtful product contributors. You'll work across the stack, help shape the future of the architecture, and solve real customer problems with empathy and clarity. If you enjoy breadth, autonomy, and impactful work, you'll thrive here and it's an excellent opportunity for a top graduate looking to fast-track their engineering career in a high-growth environment. What You'll Do Design, build, and maintain product features end-to-end Develop scalable backend services (Python) and intuitive frontend components (Svelte/jQuery) Own your work from design and implementation through testing and deployment Contribute to a high-quality, well-structured codebase writing maintainable, predictable, readable code built for reliability and long-term health Collaborate closely with product, QA, and other engineers asking clarifying questions early, seeking feedback, and communicating with precision Work with QA as partners in quality, not downstream testers Bring product thinking into engineering decisions understanding why a feature matters and how it impacts customers Challenge assumptions, propose ideas, and help shape product direction What They're Looking For Academic background: A degree from a top university, with a strong academic record Some relevant industry experience (internships, placements, or early-career roles are welcome) Technical skills: Solid experience with Python for backend development Experience with modern frontend development (Svelte and/or jQuery preferred, but not required) Familiarity with distributed systems, APIs, and integrations Comfortable working across multiple surfaces and technologies Experience with any of the following is a bonus (not required): AWS cloud services Browser/email extensions Third-party API integrations Large Language Models Mindset and behaviours: They hire for mindset as much as skill. You'll thrive if you: Collaborate openly and generously Think like an owner, taking responsibility from definition to delivery Care deeply about quality, long-term maintainability, and thoughtful design Have strong product instincts seeking context, understanding customer impact, and challenging assumptions Communicate clearly, especially in ambiguous or high-stakes situations Adapt quickly, breaking down unclear problems into actionable steps Seek continuous improvement, for yourself, your code, and your team

Senior Full Stack Engineer £85,000 to £105,000 Permanent Remote, with occasional London office visits The opportunity Our client is hiring a Senior Full Stack Engineer to take ownership of building the next generation of customer-facing software in the energy market. The business operates in a complex, high-value sector and is using technology, data, and strong product thinking to modernise an industry that has historically been underserved by great software. We have already recruited 4 people into the business, and all 4 are still there. We know the company and team well and are pleased to be supporting them again on this important hire. This is a genuinely high-impact opportunity for an experienced engineer who is equally comfortable across frontend and backend development. You will take the lead on building new products and developing the codebase, with significant autonomy over technical decisions, architecture, and delivery. The position can be fully remote, although the business would welcome occasional visits to its Mayfair office for collaboration and team time. The role This is a true full stack position. They need someone strong in React and TypeScript who can build polished, reliable customer-facing software, but who is equally capable of contributing across backend services, APIs, application logic, databases, and data-rich workflows. The platform supports complex energy processes across areas such as billing, metering, consumption, reporting, and asset performance. You will be responsible for taking those workflows and turning them into clear, scalable products that customers genuinely value. Initially, you will lead much of the engineering work independently. You will not, however, be expected to operate without support. The business can provide access to external engineering expertise and additional coding support where needed as the platform and codebase develop. This role offers genuine autonomy. You will have the freedom to make sensible technical decisions, shape engineering standards, and influence how the product evolves as the company grows. What you will be doing Leading the development of customer-facing products from initial concept through to production Building modern frontend applications using React and TypeScript Designing and developing backend services, APIs, integrations, and application logic Working with Python, SQL, databases, and data platforms Taking ownership of architecture, technical decisions, and engineering standards Turning complex energy and operational data into clear, intuitive product experiences Working closely with product, data, leadership, and external engineering partners Building a scalable and maintainable codebase from the ground up Helping define the future engineering team and technical direction as the business expands What they are looking for Strong commercial experience across both frontend and backend engineering Excellent React and TypeScript capability Strong backend development experience, ideally including Python Good experience with APIs, databases, SQL, and system integrations A track record of leading projects or taking ownership of major technical workstreams Experience building customer-facing software from scratch Strong product instincts and the ability to think beyond individual tickets Confidence making technical decisions and working with a high level of autonomy Excellent communication skills and the ability to work closely with technical and non-technical stakeholders Personality and attitude are particularly important. They want someone positive, proactive, collaborative, and genuinely enthusiastic about building great software. The right person will bring energy to the team, take responsibility, and approach challenges with a practical and constructive mindset. Nice to have Startup or scale-up experience Energy, utilities, trading, sustainability, or fintech experience Data visualisation experience Experience working with Databricks or similar data platforms Experience using AI-assisted development tools Previous involvement in shaping engineering teams, standards, or architecture Why join A salary of £85,000 to £105,000 + Bonus The flexibility to work remotely Occasional collaboration from the Mayfair office Real autonomy over what gets built and how it is delivered The opportunity to lead a major product and codebase from an early stage Direct influence over product and technical direction Support from external engineering resources when required Broad exposure across frontend, backend, data, architecture, and product Long-term scope to help build and shape the engineering function A growing business operating in a complex and important energy market Summary This is an excellent opportunity for a Senior Full Stack Engineer who wants meaningful ownership rather than simply maintaining an established platform. You will lead the development of customer-facing software, work across React, TypeScript, Python, APIs, databases, and data-rich systems, and have the autonomy to shape the technical direction of a growing energy business. They are looking for someone technically strong, but equally importantly, someone with an excellent attitude who is positive, engaging, and excited by the opportunity to build.

Junior Software Developer Central London, Old Street Hybrid, 1 to 2 days per week in the office initially Up to £55,000 I am working with an innovative technology company that uses AI, machine learning and modern software engineering to build products that solve real-world transport challenges. They are looking for a Junior Software Developer with around 1 to 2 years of commercial experience to join their growing engineering team. This is an excellent opportunity for someone who enjoys backend development and wants to gain broader commercial experience across Python, Node.js, databases, cloud technologies and production machine learning systems. Rather than being restricted to one area, you will contribute across the full software development lifecycle, giving you the opportunity to broaden your technical skills and accelerate your career. What You Will Be Doing Developing backend services and APIs using Python and Node.js Working with PostgreSQL, SQL and MongoDB Contributing to React-based frontend applications Supporting the training and deployment of commercial machine learning models Working with object detection and computer vision functionality Deploying and maintaining applications using AWS Collaborating with an experienced engineering team to build clean, scalable and maintainable software What They Are Looking For You will ideally have: Around 1 to 2 years of commercial software development experience Commercial experience with Python and/or Node.js Experience working with SQL or NoSQL databases, including PostgreSQL, SQL or MongoDB Practical commercial exposure to machine learning projects Experience contributing to the deployment of an ML solution as part of a team Experience with React, AWS, Django, Flask, FastAPI, REST APIs, Git or CI/CD would also be beneficial. You do not need to be a machine learning specialist. However, you should have practical industry experience working with and deploying machine learning solutions as part of a commercial team, rather than exposure limited to coursework or personal projects. Why Join? Broad engineering role covering backend development, databases, cloud and machine learning Hands-on exposure to commercial AI and computer vision technology Opportunity to work on real products that solve practical transport challenges Modern technology stack Visible contribution within a growing engineering team Genuine scope to learn, take ownership and progress Flexible hybrid working Salary of up to £55,000 The company is based in Central London, close to Old Street. New starters are encouraged to spend 1 to 2 days per week in the office initially to get to know the team and wider business. The interview process includes an initial screening interview, a take-home technical task, a technical interview and a final management discussion.

Senior Software Engineer (TypeScript Full Stack) London / WFH to £100k Do you enjoy problem solving and working with a range of technologies including functional programming languages such as Elixir, using the right tool for the job? You could be progressing your career in a senior, hands-on Software Engineer role at a successful and profitable energy trading market data scale-up. What's in it for you: Competitive salary, to £100k + Significant Equity Hybrid working (3 days London office per week) Vitality Healthcare Continuous career development and learning opportunities Influential role as part of a small, close knit team Complex and interesting work Your role: As a Senior Software Engineer you will take ownership, working on technically challenging Greenfield development projects. You'll be working on complex problems with scalability and reliability in mind, across the full development lifecycle from architecture and design through to implementation. There's a range of technology in the stack, you'll have a 50/50 split between backend and frontend development using TypeScript, Elixir, Elm and AWS amongst others, learning and picking new things up on the job in a collaborative, tech driven environment where you can get stuff done and see the results of your work. Location / WFH: You'll join the team in London three days a week in a hybrid work from home model. About you: You are degree educated in Computer Science or similar STEM discipline, having achieved a 2.1 or above from a Russel Group / Oxbridge or top 100 global university You are an experienced software engineer with a strong knowledge of best practices and Computer Science fundamentals and experience of delivering complex, data centric software You have advanced analytical and problem solving skills You're comfortable taking ownership of projects and mentoring more junior team members You have strong TypeScript skills, combined with any backend programming language (e.g. Python, Java, C++, C#) You're happy to work with the following tech stack (you don't need experience with all): Elixir, Ember, Elm, Phoenix, LiveView, Python, PostgreSQL, AWS, Docker You have an analytical mindset and enjoy problem solving You have experience of working in start-ups / SMEs and have good business acumen Ideally you will have a good understanding of financial markets Apply now to find out more about this Senior Software Engineer (TypeScript Full Stack Elixir) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.

Full Stack AI Software Engineer - Full Remote UK - £90,000 + Equity This role requires a software engineer with experience in implementing RAG pipelines and Vector Search (and hybrid AI searches, preferably). The client I am working with is an AI focused start-up backed by a £1.7M pre-seed investment. They are on a mission to streamline the deal making process, with the founders having had firsthand experience of the lengthiness and challenges of deal processes in the past. Their stack spans across back end, front end, data and crucially AI.This is a great opportunity for an entrepreneurial software engineer who wants to play a part in shaping the technical vision of this business and work on their product from an early stage. What you'll work on: Backend APIs (Python/FastAPI): Build and maintain secure, high-performance services that drive AI features and data access at scale. RAG & vector search: Design and improve retrieval pipelines (embeddings, chunking, hybrid search, ranking, feedback loops), owning schema design, latency, and relevance across vector databases. LLM integration: Connect and orchestrate large language models (OpenAI, Bedrock, etc.), manage prompts, tools, safeguards, and evaluation. Data pipelines: Ingest, clean, and transform structured and unstructured data; design efficient schemas (Postgres/NoSQL) for search and analytics. Frontend (React/Next.js): Deliver user-friendly, performant UIs that make AI-powered features (search, filters, explanations, citations) clear and accessible. Architecture: Shape a modular, scalable platform on AWS (ECS), separating ingestion, retrieval, reasoning, and delivery. Quality & reliability: Ensure reliability through testing, CI/CD, observability (metrics/tracing for LLM and retrieval paths), and performance optimisation. Collaboration: Partner with product and leadership teams, mentor peers, and play a role in shaping technical direction. Innovation: Explore and recommend new technologies, frameworks, and methods for both full-stack and AI development. Requirements: A motivated, hands-on engineer with an ownership mindset, strong communication skills, and a collaborative approach. 5+ years' experience in full-stack development. Strong background in RAG systems , vector databases (pgvector, FAISS, Weaviate, Elasticsearch k-NN), embeddings, and hybrid search methods. Practical knowledge of chunking strategies, indexing, precision/recall trade-offs, reranking, and evaluation techniques. Proficient in Python (FastAPI) and React/Next.js . Solid experience with both SQL and NoSQL databases (Postgres, DynamoDB, etc.). Exposure to LLMs, embeddings, and vector search APIs . Strong understanding of data engineering , schema design, ETL, and optimisation. Proficiency with cloud (AWS preferred) and containerised deployments (Docker, ECS). Knowledge of secure coding practices and managing sensitive data. Excellent communication, problem-solving, and leadership skills. Nice to have Experience with rerankers (e.g., cross-encoders), hybrid retrieval (SQL + vectors), query expansion, or lightweight knowledge graphs. Familiarity with LLM evaluation tooling (LangChain, LlamaIndex, OpenAI Evals) and observability for cost, relevance, and latency. Background in B2B data products or fintech.

Software Engineer / Developer Newcastle onsite to £70k+ Are you a bright, ambitious Software Engineer looking for an opportunity to progress your career, working on complex and interesting systems in a role where you can learn and develop your skills? You could be joining a FinTech start-up, they have secure backing and an established Hedge Fund client as a partner. As a Software Engineer you will collaborate with a small, talented team to deliver the core platform within a Microsoft environment using the latest versions of C# .Net to produce high quality code. Once the Beta has been rolled out and tested the company has ambitious growth plans, this is a great opportunity to be involved from the ground up and progress your career. Location / WFH: You'll join colleagues in brand new Central Newcastle offices on a full-time basis (Monday to Friday), working hours with some flexibility. The offices are well equipped and offer fantastic views across the City and the local countryside, many employees walk or cycle in (onsite showers available!). About you: You have achieved a minimum 2.1 BSc in Computer Science or similar technical discipline from a top tier / Russel Group university, backed by A's at A-level You're a technologist who enjoys collaborating and problem solving, working on complex, distributed systems You have strong backend coding skills - you can come from any tech background (e.g. Java, Python, Full Stack) but be happy to use C# .Net going forward and pick up new things along the way You have experience with public cloud technologies - Azure, AWS, GCP You have a good knowledge of modern software engineering best practices and have experience across the full software development lifecycle You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, Design Patterns, Algorithms You're excited to join a start-up in a role that you can shape and influence What's in it for you: As a Software Engineer / Developer you will earn a competitive package: Salary to £70k Bonus 25 days holiday Bupa healthcare Generous pension contribution Continuous career development opportunities Social team atmosphere with a range of events and early finish for drinks on Fridays Apply now to find out more about this Software Engineer / Developer opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.