Senior Kotlin Engineer (XP, GCP) - Investment Banking - London/Hybrid Daily rate: £600 - £800 (inside IR35) Duration: 6 months Start: ASAP My client is looking for an experienced Senior Kotlin engineer to support and extend a cloud-hosted platform used for bookbuilding issuances within Investment Banking Capital Markets. You will join a high-calibre London-based front office engineering team working on a next-generation issuance platform replacing a legacy bookbuilding system. This is a hands-on engineering role with a strong emphasis on Extreme Programming (XP) practices, including mob programming, test-driven development, and continuous refactoring. Engineers are expected to contribute across development, integration, and production support, collaborating closely to maintain high standards of code quality, system reliability, and performance. Required & Desirable Skills Strong commercial experience building backend services using Kotlin Experience with event-sourced and event-driven architectures Deep familiarity with XP practices, including: Mob programming as a primary way of working Test-driven development (TDD) Continuous refactoring and clean code principles Cloud experience with GCP, including: GKE and/or Cloud Run Cloud SQL and Memory store Artifact Registry and Cloud Logging Key Management Experience with CI/CD and SDLC in regulated or enterprise environments Comfortable working on production systems requiring high availability and accuracy Engineers in this role: Work primarily in mobs, sharing ownership of design and code Build, test, and evolve services with a strong focus on clarity, simplicity, and maintainability Support the platform in production, using incidents and defects as opportunities to improve system design and resilience Rates depend on experience and client requirements
Jun 20, 2026
Contractor
Senior Kotlin Engineer (XP, GCP) - Investment Banking - London/Hybrid Daily rate: £600 - £800 (inside IR35) Duration: 6 months Start: ASAP My client is looking for an experienced Senior Kotlin engineer to support and extend a cloud-hosted platform used for bookbuilding issuances within Investment Banking Capital Markets. You will join a high-calibre London-based front office engineering team working on a next-generation issuance platform replacing a legacy bookbuilding system. This is a hands-on engineering role with a strong emphasis on Extreme Programming (XP) practices, including mob programming, test-driven development, and continuous refactoring. Engineers are expected to contribute across development, integration, and production support, collaborating closely to maintain high standards of code quality, system reliability, and performance. Required & Desirable Skills Strong commercial experience building backend services using Kotlin Experience with event-sourced and event-driven architectures Deep familiarity with XP practices, including: Mob programming as a primary way of working Test-driven development (TDD) Continuous refactoring and clean code principles Cloud experience with GCP, including: GKE and/or Cloud Run Cloud SQL and Memory store Artifact Registry and Cloud Logging Key Management Experience with CI/CD and SDLC in regulated or enterprise environments Comfortable working on production systems requiring high availability and accuracy Engineers in this role: Work primarily in mobs, sharing ownership of design and code Build, test, and evolve services with a strong focus on clarity, simplicity, and maintainability Support the platform in production, using incidents and defects as opportunities to improve system design and resilience Rates depend on experience and client requirements
Senior Kotlin Software Engineer (Investment Banking) - London/hybrid Daily rate: £600 - £1000 Duration: 6 months Hybrid: 2 days on site Start: ASAP My banking client is looking for 2 experienced Senior Kotlin Software Engineers to join a cloud-hosted platform team within an investment banking environment. This is a fast-paced, Front Office-facing role with a strong emphasis on high-quality engineering, reliability, and collaborative working practices. The role offers exposure to modern engineering practices and the opportunity to work closely with business stakeholders in a demanding and high-impact environment. Key Responsibilities Design, develop, test, and maintain Back End services using Kotlin Contribute across the full software life cycle: development, integration, and production support Implement and support event-driven architectures, including event sourcing and event streaming Work within an Agile/XP environment, utilising: Pair programming Mob programming Test-first development practices Build and maintain CI/CD pipelines and deploy services to cloud environments Continuously refactor code and uphold high standards of code quality and reliability Participate in architectural and technical design discussions Collaborate closely with Front Office stakeholders and cross-functional teams Deliver solutions within short timelines and respond to urgent business needs Essential Skills & Experience Strong commercial experience developing production-grade Kotlin applications (non-Android) Proven experience with Test-Driven Development (TDD) and test-first approaches Hands-on experience with event-driven systems (event streaming and/or event sourcing) Experience with CI/CD tools and practices Strong background in refactoring Legacy code and maintaining clean, maintainable systems Experience working in Agile/XP environments, ideally including mob programming Excellent communication skills with the ability to engage effectively with business/Front Office stakeholders Desirable Skills & Experience Prior experience in investment banking or financial services, particularly Front Office systems Experience with cloud platforms (AWS, GCP, or Azure) Familiarity with containerisation technologies (Docker, Kubernetes) Experience with Kafka or similar messaging/event platforms Understanding of distributed systems design and immutable event patterns Experience with observability, monitoring, and incident response tools Exposure to low-latency or high-availability systems *Rates depend on experience and client requirements
Jun 19, 2026
Contractor
Senior Kotlin Software Engineer (Investment Banking) - London/hybrid Daily rate: £600 - £1000 Duration: 6 months Hybrid: 2 days on site Start: ASAP My banking client is looking for 2 experienced Senior Kotlin Software Engineers to join a cloud-hosted platform team within an investment banking environment. This is a fast-paced, Front Office-facing role with a strong emphasis on high-quality engineering, reliability, and collaborative working practices. The role offers exposure to modern engineering practices and the opportunity to work closely with business stakeholders in a demanding and high-impact environment. Key Responsibilities Design, develop, test, and maintain Back End services using Kotlin Contribute across the full software life cycle: development, integration, and production support Implement and support event-driven architectures, including event sourcing and event streaming Work within an Agile/XP environment, utilising: Pair programming Mob programming Test-first development practices Build and maintain CI/CD pipelines and deploy services to cloud environments Continuously refactor code and uphold high standards of code quality and reliability Participate in architectural and technical design discussions Collaborate closely with Front Office stakeholders and cross-functional teams Deliver solutions within short timelines and respond to urgent business needs Essential Skills & Experience Strong commercial experience developing production-grade Kotlin applications (non-Android) Proven experience with Test-Driven Development (TDD) and test-first approaches Hands-on experience with event-driven systems (event streaming and/or event sourcing) Experience with CI/CD tools and practices Strong background in refactoring Legacy code and maintaining clean, maintainable systems Experience working in Agile/XP environments, ideally including mob programming Excellent communication skills with the ability to engage effectively with business/Front Office stakeholders Desirable Skills & Experience Prior experience in investment banking or financial services, particularly Front Office systems Experience with cloud platforms (AWS, GCP, or Azure) Familiarity with containerisation technologies (Docker, Kubernetes) Experience with Kafka or similar messaging/event platforms Understanding of distributed systems design and immutable event patterns Experience with observability, monitoring, and incident response tools Exposure to low-latency or high-availability systems *Rates depend on experience and client requirements
