Holt Executive

We are seeking a talented and motivated Flight Dynamics Engineer to join a growing engineering team developing advanced flight dynamics capabilities for defence and space applications. This role offers the opportunity to contribute to the design and evolution of sophisticated software products supporting space domain awareness, mission analysis, and space operations. Working within a multidisciplinary engineering environment, you will help develop innovative flight dynamics solutions, influence product direction, and collaborate with technical specialists to deliver high-quality software and services that meet evolving customer requirements. This is an excellent opportunity for someone who enjoys solving complex technical challenges, working closely with customers, and contributing to advanced space programmes within an Agile software development environment. Key Responsibilities Design, develop, validate and maintain flight dynamics software for defence and space applications. Support business development activities by providing technical expertise during bids and customer engagements. Develop and specify flight dynamics algorithms to support operational software capabilities. Review flight dynamics designs, procedures and technical documentation. Capture, analyse and refine customer and system requirements, translating them into user stories and technical specifications. Help prioritise and define features for future software releases. Support system verification, validation, integration and simulation activities. Provide technical support to operations teams, troubleshooting issues and recommending best practice. Act as the technical interface with external suppliers and development partners where required. Work within an Agile (Scrum) environment to deliver software to agreed schedules. Produce and maintain high-quality engineering documentation, including requirements, verification plans, test procedures and technical reports. Essential Experience Master's degree in Astronautics, Aerospace Engineering, Physics or a related discipline (or equivalent experience). At least five years' commercial experience in flight dynamics within the space or defence sectors. Eligible to obtain UK Security Clearance (SC) or higher. Strong understanding of orbital mechanics and spacecraft flight dynamics. Experience with mission analysis and trajectory design. Experience using MATLAB or equivalent simulation tools. Strong Python programming skills. Experience defining and managing technical requirements. Understanding of the full software development lifecycle, including design, development, integration, testing and maintenance. Experience working alongside spacecraft operations or mission operations teams. Excellent written and verbal communication skills in English. Desirable Experience Knowledge of ECSS standards. Commercial software engineering experience. Experience with commercial flight dynamics software tools. Familiarity with Linux operating systems. Working knowledge of Microsoft Windows and Office applications. What's on Offer Hybrid and flexible working arrangements including 9/75 work pattern. Opportunity to work on challenging space and defence programmes using advanced technologies. Collaborative, supportive engineering environment. Career development and training opportunities. Private healthcare. Life assurance and long-term sickness cover. Generous annual leave entitlement plus public holidays. Relocation assistance may be available. Modern office facilities and regular team social events. If you're passionate about orbital mechanics, spacecraft operations and developing software that supports the future of space and defence, we'd like to hear from you. TT

We are seeking a highly experienced Senior Space Systems Engineer to support the design, development, and integration of complex space-based systems across telecommunications and positioning, navigation, and timing domains. This is a senior-level opportunity within a strategic engineering team focused on delivering high-performance, resilient global communication and navigation capabilities for mission-critical users. The role spans early concept studies through to full system development and delivery. You will be part of a multidisciplinary engineering environment, contributing to the growth of advanced systems engineering capability while helping shape next-generation space-enabled services. Key Responsibilities Lead and support technical activities across mission concept studies, research programmes, and full system development projects Conduct mission analysis, trade studies, and system architecture design Manage system and subsystem requirements capture, flow-down, and verification Develop and maintain system budgets (mass, power, data, thermal) and performance models Contribute to strategic development of PNT and telecommunications capabilities Support engagement with institutional and governmental space organisations and stakeholders Produce technical reports, bid documentation, and engineering recommendations for senior stakeholders Identify and manage programme risks, assumptions, dependencies, and technical issues Perform reliability, availability, and maintainability (RAMS) analysis of system architectures Apply Model-Based Systems Engineering (MBSE) tools and approaches to validate system designs Experience Required Degree-qualified in Physics, Engineering, Mathematics, or a related numerate discipline (or equivalent experience) Significant experience in systems engineering or system architecture roles within the space industry or a related sector Strong understanding of spacecraft systems, space mission operations, and spacecraft development (including AIT processes) Experience with system modelling tools such as STK, MATLAB, and MBSE platforms (e.g. Enterprise Architect) Knowledge of orbit determination techniques and space system analysis Strong understanding of project management and financial modelling principles Excellent communication skills, including technical writing and stakeholder presentations at all levels Membership of a professional engineering institution (e.g. INCOSE or equivalent) is desirable Desirable Experience Knowledge of PNT systems, GNSS, satellite-based augmentation systems, or time transfer techniques Experience with advanced space system operations and analysis methodologies Familiarity with alternative timing systems beyond GNSS-based solutions Exposure to large-scale international space or government programmes TT

We are supporting a leading technology organisation in the search for a Cyber Security Analyst to join its Security Operations team. This is an excellent opportunity to join a fast-paced cybersecurity environment, helping to protect critical infrastructure and enterprise systems through proactive monitoring, incident response, and threat analysis. Working as part of a 24/7 operational security function, you will play a key role in identifying, investigating, and responding to security threats across both cloud-based and on-premise environments. Key Responsibilities Monitor security events, alerts, and incidents across enterprise networks and systems. Manage security cases and tickets through to resolution. Analyse logs and data from SIEM platforms, security monitoring tools, network infrastructure, and endpoint technologies. Investigate and triage security alerts to identify malicious activity and determine attack methods and techniques. Follow established incident response and escalation procedures to contain and mitigate security risks. Ensure all incidents are accurately documented, including indicators of compromise, evidence, and investigation findings. Identify and address false positives, providing feedback to improve detection capabilities. Support the development and optimisation of security monitoring rules and processes. Analyse data sets to identify security gaps and recommend improvements. Skills & Experience Essential Degree in Information Security, Computer Science, Digital Forensics, or a related discipline, or equivalent industry experience. 3+ years' experience in cyber security, security operations, threat analysis, or security monitoring. Experience investigating security incidents and working within a Security Operations Centre environment. Understanding of incident response processes, security event triage, and escalation procedures. Strong knowledge of networking protocols, authentication mechanisms, and common attack techniques. Good understanding of information security principles, technologies, and best practices. Experience securing and supporting Windows and Linux environments. Excellent written and verbal communication skills. Desirable Industry certifications such as GCIH, GCIA, or equivalent cyber security qualifications. Experience working with SIEM platforms and security monitoring technologies. Knowledge of Oracle and virtualised environments. What's on Offer Opportunity to work within a highly skilled cyber security team. Exposure to complex security environments and emerging threats. Ongoing professional development and training opportunities. Collaborative and supportive working culture. Competitive salary, bonus and benefits package. This is an excellent opportunity for a Cyber Security Analyst looking to further develop their incident response, threat analysis, and security operations expertise within a technically challenging environment. TT

A leading technology organisation is seeking an experienced Senior Software Engineer to join a team responsible for developing and supporting critical software applications used to monitor, analyse, and optimise large-scale operational systems. This is an exciting opportunity for a hands-on engineer to work on real-time data platforms, operational tooling, and service assurance solutions that provide valuable insights into complex network environments. You will play a key role in designing, developing, and maintaining software that supports business-critical operations, working closely with engineering teams, product stakeholders, and operational users. The role combines software development, system integration, troubleshooting, and continuous improvement, making it ideal for someone who enjoys solving complex technical challenges and delivering reliable, scalable solutions. Key Responsibilities Develop, enhance, and support software applications used within operational environments. Design and implement new features based on user and business requirements. Work closely with engineering teams to understand system architectures and ensure effective monitoring and data collection capabilities. Analyse system performance, troubleshoot issues, and support operational teams with fault diagnosis. Participate in software design, code reviews, testing, and documentation activities. Collaborate with internal stakeholders, product teams, and third-party suppliers to deliver effective solutions. Support the ongoing maintenance and improvement of operational systems. Identify opportunities to improve processes, tooling, and software reliability. Contribute to the full software development lifecycle, from requirements gathering through to deployment and support. Provide technical support for live operational systems, including occasional on-call responsibilities. Experience Required Degree in Computer Science, Software Engineering, or a related technical discipline. Strong hands-on experience developing software using Java within a real-time operational environment. Strong experience with JavaScript and Node.js development. Experience working with both Windows and Linux operating systems. Good understanding of IP networking and experience troubleshooting network issues using tools such as Wireshark or similar. Experience working with event streaming technologies such as Kafka. Strong understanding of the full software development lifecycle. Experience producing high-quality, maintainable, and reusable software within a collaborative engineering environment. Understanding of object-oriented analysis, design principles, and common design patterns. Strong communication skills with the ability to collaborate effectively across technical and non-technical teams. Awareness of software and network security best practices. Experience producing clear technical documentation to support ongoing development and operational support. Desirable Experience Real-time monitoring or service assurance platforms. Large-scale distributed systems. Data analysis and operational dashboards. Network management or telecommunications environments. Supporting production systems within a 24/7 operational environment. The Ideal Candidate You will be a proactive and curious engineer who enjoys understanding complex systems, identifying improvements, and developing practical solutions. You will have strong technical ownership, excellent problem-solving skills, and the ability to work collaboratively across engineering and operational teams. This is an opportunity to contribute to highly visible software platforms that support critical services while working within a technically challenging and collaborative engineering environment. Benefits Hybrid and flexible working arrangements. Competitive salary and comprehensive benefits package including annual bonus. Pension scheme and private healthcare. Professional development and training opportunities. Opportunity to work on cutting-edge satellite technologies. Collaborative engineering culture with exposure to complex international programmes. TT

Spectrum Manager An opportunity has arisen for an experienced Spectrum Manager to lead spectrum management and regulatory activities across innovative satellite missions within a rapidly growing space organisation. This role is focused on ensuring compliance with international and national spectrum regulations while supporting spacecraft programmes from concept through to launch and operations. You will lead ITU satellite filings, frequency coordination, regulatory engagement, licensing activities, and technical spectrum analysis to enable the successful delivery of Active Debris Removal (ADR) and In-Orbit Servicing (IOS) missions. You will act as the key interface between engineering teams, regulators, government bodies, and international stakeholders, ensuring spectrum compliance is embedded throughout mission development. The role requires strong technical knowledge of satellite communications, ITU regulations, spectrum policy, and the ability to influence both technical and regulatory outcomes. Key Responsibilities for the Spectrum Manager: Lead ITU satellite filings and frequency coordination activities for current and future satellite missions Prepare, submit, and manage satellite filings while ensuring all regulatory milestones and deadlines are achieved Produce annual regulatory reports and maintain filing documentation with national authorities Negotiate frequency coordination agreements with international satellite operators and administrations Perform technical studies including RF interference analysis, compatibility assessments, link budgets, and spectrum simulations Provide technical guidance to engineering teams on compliance with ITU Radio Regulations and national licensing requirements Support licensing activities for satellite ground stations and associated communications infrastructure Develop technical reports, regulatory assessments, and spectrum strategies for spacecraft programmes Engage with Ofcom, the ITU, UK Government organisations, Ministry of Defence, and international regulatory stakeholders Support the development and implementation of spectrum policy for future satellite missions Represent the organisation at ITU Working Parties, regional preparatory meetings, and World Radiocommunication Conference (WRC) activities where required Essential Skills & Experience for the Spectrum Manager: Bachelor's or Master's degree in Electrical Engineering, Telecommunications, Radio Frequency Engineering, or a related discipline Experience in spectrum management or spectrum engineering within the satellite or space sector Strong understanding of satellite communications systems, spacecraft engineering, and radio frequency principles Working knowledge of ITU Radio Regulations, satellite filing procedures, satellite licensing, and spectrum management processes Experience conducting interference analysis, frequency coordination, link budget analysis, or spectrum compatibility studies Good understanding of the commercial and regulatory space industry environment Ability to manage technical work independently while delivering against programme schedules and budgets

An exciting opportunity has arisen for an experienced Software Solutions Architect to join an innovative engineering organisation developing complex, mission-critical software systems. Working across multiple engineering teams and external technology partners, you will be responsible for defining and maintaining solution architectures that enable the successful integration of software platforms, cloud services, and operational systems. Acting as the technical bridge between stakeholders, you will ensure solutions remain scalable, secure, and aligned with long-term business and engineering objectives. This role would suit an experienced architect with strong systems thinking, a collaborative approach, and a passion for delivering robust software solutions within highly regulated engineering environments. Key Responsibilities Develop and maintain end-to-end solution architectures across multiple software systems and suppliers. Define implementation roadmaps, operational models, and long-term technology strategies. Ensure solutions meet security, privacy, performance, and testing requirements. Design cloud-based architectures, selecting appropriate services while optimising cost and scalability. Support migration of existing applications and services to modern cloud environments. Provide architectural governance throughout project delivery, managing change requests and technical risks. Collaborate with software, systems, infrastructure, and external engineering teams to ensure seamless integration. Ensure compliance with relevant engineering standards, policies, and best practices. Required Experience Proven experience as a Software Solutions Architect or in a similar senior technical architecture role. Strong background designing and integrating complex software systems across multiple teams and suppliers. Experience developing secure, scalable, and maintainable solution architectures. Knowledge of cloud platforms such as AWS or Azure, including cloud migration and cost optimisation. Experience producing architecture roadmaps and guiding implementation activities. Understanding of architecture governance, change management, and technical risk assessment Desirable Experience Experience within aerospace, space, defence, robotics, or other safety- or mission-critical industries. Familiarity with systems engineering principles and software architecture standards. Experience with distributed systems, APIs, and integration platforms. Knowledge of DevOps practices, CI/CD pipelines, and modern software delivery methodologies. Understanding of cybersecurity principles and secure-by-design architectures. Experience working with third-party technology providers and managing technical integrations. Knowledge of data architecture and enterprise integration approaches. What's on Offer Hybrid and flexible working arrangements including 9/75 work pattern. Private healthcare and life assurance. Generous annual leave allowance with additional service-related entitlement. Relocation support available for suitable candidates. Modern engineering facilities and collaborative working environment. Opportunity to work on technically challenging, mission-critical programmes alongside experienced multidisciplinary engineering teams. TT

A leading satellite communications organisation is seeking an experienced Systems Engineer to join its Access Networks engineering team, supporting the design, integration, and deployment of next-generation satellite communications systems. This is an exciting opportunity to play a key role in the development of advanced 5G Non-Terrestrial Networks (NTN), working across cutting-edge satellite programmes and helping deliver innovative connectivity solutions. You will contribute throughout the full systems engineering lifecycle, from requirements definition and architecture through integration, testing, and operational deployment. Working within a multidisciplinary engineering environment, you will collaborate with systems, software, network, and operations teams while acting as a technical authority across complex communications programmes. Key Responsibilities Lead systems engineering activities for Radio Access Network (RAN) and Access Network subsystems. Develop and manage system requirements, specifications, and technical documentation. Support the design, integration, validation, and deployment of advanced satellite ground segment capabilities. Design and validate 5G NTN Layer 2 and Layer 3 features in line with 3GPP standards. Lead simulation and modelling activities to evaluate system performance and inform engineering decisions. Develop test methodologies, tools, and validation campaigns for new network capabilities. Support the deployment of laboratory and test infrastructure for next-generation communications systems. Collaborate with software, systems, operations, and programme teams to successfully introduce new services. Investigate and resolve complex technical challenges across multiple engineering disciplines. Contribute to future radio resource management strategies to maximise network performance and efficiency. Monitor industry developments and emerging technologies, helping shape future system architecture and technology roadmaps. Provide technical leadership during integration, testing, and service introduction activities. Required Experience & Qualifications Degree in Electronic Engineering, Telecommunications, Satellite Communications, Computer Science, or a related engineering discipline. Strong systems engineering experience within telecommunications or satellite communications environments. Knowledge of Radio Access Network (RAN) technologies. Understanding of: 5G Non-Terrestrial Networks (NTN) Satellite propagation Modulation and coding Mobile satellite and VSAT systems Experience developing system requirements, specifications, and technical documentation. Desirable Experience Experience with any of the following would be advantageous: 3GPP 5G standards Satellite ground segment systems Terrestrial mobile network design and operation Radio resource management RF systems and antenna technologies (Ka, L or Q/V Band) Performance modelling, simulation, and data analysis Large-scale telecommunications or satellite network integration programmes Why Apply? This is an opportunity to work on some of the most advanced satellite communications programmes currently in development, helping deliver next-generation global connectivity solutions. You'll join a highly collaborative engineering environment where you'll influence system architecture, contribute to innovative technologies, and work across the full lifecycle of complex satellite communications systems. Benefits Hybrid and flexible working arrangements. Competitive salary and comprehensive benefits package. Pension scheme and private healthcare. Professional development and training opportunities. Opportunity to work on cutting-edge satellite and 5G NTN technologies. Collaborative engineering culture with exposure to complex international programmes. TT