6,245 Mainframe Engineer jobs in the United Kingdom

• Translate customer needs into engineering systematic solutions via the use of Requirements Capture, Use-Cases and Systems architecture design.
  
• To maintain the systems architecture design through complex multi-disciplinary product development teams.
  
• To provide cradle-to-grave systems support throughout the entire project lifecycle: from definition and design through to testing and delivery.
  
• To proactively manage change throughout the development lifecycle
  
• To provide technical representation externally to both customers and sub-contractors.
  
• Design and development of robust system architectures which encompass electrical, mechanical and software interfaces and interactions.
  
• Modelling and simulation as needed to define the scope of an R&D product.
  

• A bachelor's degree in a technical field like engineering, computer science, or a related discipline
  
• A track record in translating customer requirements into system and subsystem requirements.
  
• Systems Architecture and design - be familiar with requirements capture using object orientated modelling.
  

What you'll do

• Undertake design activities at the equipment, system and software levels.
• Meet technical requirements through all phases of design, integration and leading to customer acceptance.
• Develop and review technical documentation to support project development and deliverables, including test plans, specifications and procedures.
• Undertake testing and qualification activities throughout the project.
• Identify project technical risks and opportunities.
• Attendance and input to project design reviews with customers.
• Involvement with acceptance events at factory and external sites.
• Involvement in the safety, reliability and through-life support of products.
• Support the business development by assisting preparation of technical proposals & solutions.
• Foster good working relationships with suppliers and customers.
• Supporting the research and development of products within the Company, improving engineering quality, efficiency and cost.

What you'll need

• Track record of delivering complex system design, implementation, test and integration in the Defence (or similar, highly regulated) domain.
• Experience of full system lifecycle, design, development, testing, integration and acceptance.
• The ability to analyse and specify system acceptance requirements.
• Understanding of network technologies.
• Appreciation of complex electronics and firmware design principles.
• Strong technical knowledge of military-grade COTS communication and sensor systems.
• Have a high level of both verbal and written communication skills providing regular communications to internal and external stakeholders, customers and suppliers.
• Experience of Model Based System Engineering (desirable)
• Experience of Windows and Linux Operating Systems (desirable).
• Appreciation of modern software design techniques and languages (e.g. C++, Java, C#) (desirable).
• Signal &image processing knowledge (desirable).
• Member of a Professional Engineering or Science Institute (desirable).
• Experience of agile or spiral development lifecycles (desirable).
• At least a BSc Degree in Engineering, Maths or Science subject or equivalent experience.
• Sole UK National.
• Ability to attain DV or SC UK Security Clearance.
• Full driving license.
• Ability to ad-hoc travel within the UK

Working for Open Cosmos

Aim high, go beyond

At Open Cosmos we are solving the world's biggest challenges from space, providing businesses, governments and researchers access to more readily available information than ever before - ready for the challenge? Then read on…

Working in our Chief Technology Office

The CTO division is where Open Cosmos technology comes to life. Covering engineering, product development, and technical innovation, the team designs, builds, and operates the satellites, systems, and platforms that make our missions possible. It's a highly collaborative environment where ideas become real hardware, software, and data solutions that deliver impact from space.

Our Systems Team brings together brilliant Systems, AOCS and Thermal Engineers who turn ambitious mission concepts into reality. They design, integrate, and optimise every detail – from spacecraft architecture to next-generation optical payloads – making sure every system fits, works, and thrives in orbit. From first sketch to launch day, they own the journey, ensuring our satellites deliver maximum impact back on Earth

What will you be doing?

As a Systems Engineer, you'll play a pivotal role in delivering fully integrated space missions, taking ownership from concept to launch (and beyond). You'll lead technical delivery, collaborate across disciplines, and be deeply involved in the system architecture that enables our satellites to succeed in orbit.

• Mission Leadership: Serve as the technical lead for full mission delivery, coordinating across multiple engineering domains.
• Systems Design & Analysis: Own the architecture, perform critical system-level analysis and trade-offs, and guide the design through all phases.
• Requirements & Verification: Define and manage system requirements, verification plans, and traceability to ensure mission readiness.
• Risk & Resilience: Conduct FMECA and design FDIR to ensure mission robustness and fault tolerance.
• Cross-Functional Collaboration: Support bids, sales, mission ops, and customer teams with technical expertise and documentation.
• Subsystem Integration: Ensure harmony across spacecraft subsystems — power, comms, AOCS, propulsion, thermal, mechanical, and more.
• Customer & Supplier Engagement: Manage technical expectations, communications, and documentation with external partners.

What you need to be successful

• Proven experience across the full lifecycle of a space mission — from concept and design to launch and disposal.
• Strong grounding in satellite systems engineering, with a solid understanding of all key subsystems.
• Knowledge of mission analysis, system budgeting, FMECA, FDIR, and CONOPs definition.
• Hands-on experience with Assembly, Integration and Testing, ensuring systems perform as designed in operational environments.
• Confident communicator — able to explain complex systems clearly to customers, partners, and team members alike.
• A flexible, agile mindset — comfortable with rapid change, iterative development, and continuous learning.

To apply, you must have the legal right to work in your chosen location.

Why Open Cosmos?

• Work at the cutting edge of space technology with customers around the globe.
• A mission-driven company making space accessible to help solve real-world challenges.
• A diverse, ambitious, and supportive team.

Role: Systems Engineer

Location: Bristol or Plymouth – 2 days per week in the office

Salary: £40,000 - £55,000 depending on experience

Our client, an established engineering consultancy operating in the South West of England, require an experienced Systems Engineer to join their multi-disciplined team.

Positions are available from Junior to Senior level.

** Please note we can only consider sole UK Nationals (no dual nationalities) **

What the role of the Systems Engineer entails:

Some of the main duties of the Systems Engineer will include:

• Work collaboratively with engineering discipline leads to obtain engineering assistance required, define activities and jointly establish Statements of Work.
• Work collaboratively with the client leadership to ensure goals of engagement are fulfilled, new ideas are discussed and workstream expansion plans implemented
• Ensure project scoping, requirements capture and problem definition are done effectively and collaboratively
• Support the development of technical documentation including requirement sets, interface definitions, V&V plans and logical architectures.
• Apply and promote practical systems thinking in support of infrastructure and facilities maintenance projects
• Compile and peer review project and technical reports.
• Workload Management - Workload planning, estimating & scheduling, support project coordination if part of a multi-disciplinary team
• Be adaptable, as project requirements evolve, and ensure relevant parties are notified of changes in the project
• Drive customer satisfaction.

What experience you need to be the successful Systems Engineer:

Essential

• Bachelor’s degree (minimum) in Mechanical Engineering or a closely related discipline.
• Typically 2+ years of relevant systems engineering experience in a highly regulated industry (e.g., aerospace, nuclear, maritime, infrastructure, oil and gas etc. ).
• Understanding of systems engineering principles, including requirements management, integration and verification and validation.
• Knowledge of requirements engineering practices and methods
• Experience organising and supporting stakeholder meetings. Ability to engage with stakeholders, technical teams and cross-functional groups to understand their key needs.
• Experience in applying systems thinking in environments with legacy systems, real-world constraints and evolving problem sets.
• Good understanding of project life cycle from concept, commissioning to operations and maintenance.

Desirable

• Exposure to systems engineering frameworks such as INCOSE SE Handbook or relevant Defence Standards
• Experience in design and construction phases especially in a dockyard or industrial infrastructure environment.
• Experience with IBM DOORs
• Experience in Project Engineering: including scoping, proposing solutions and approaches, coordinating and managing progress and reporting.

This really is a fantastic opportunity for a Systems Engineer to progress their career. If you are interested please apply as soon as possible as this position will be filled quickly so don't miss out!

Security Cleared (SC) - Systems Engineer
Stevenage - onsite
Up to £55 per hour Inside IR35

IO Associates is seeking for a Security Cleared (SC) - Systems Engineer for the Stevenage site. You will join a global aerospace leader specializing in commercial and military aircraft, helicopters, defense, and space sectors. This role offers a chance to contribute to innovative projects within a dynamic team shaping the future of aviation and space systems.

You will develop and deliver test solutions from planning and coding to debugging and execution. You will be providing first-line support during test anomalies, contribute technical inputs, and complete tests with reviews and reports.

Skills

• Active Security Clearance (SC).
• Experience in writing and debugging test sequences and procedures.
• Experience of working on Test systems.
• Experience on either C or Java (company use a bespoke system, these are similar)
• Systems engineer in space or aerospace.

This is an excellent opportunity to work for an international aerospace leader that encourages and facilitates personal growth.

*PS: The Company can't provide any sponsorship, so only candidates with the existing right to work in the UK will be considered for this role.

About the Company

Due to an increased workload, we are seeking experienced Systems Engineers to join a specialist Systems Team for a leading defence client of ours, based in Stevenage. You will be working on highly complex, yet exciting projects. We are looking for someone with the right mind-set and behaviours to compliment a solid engineering background. This opportunity offers excellent potential for career progression within a leading European defence company.

About the Role

We are offering an exciting opportunity for a Systems Engineer to join the Electro-Optical (EO) Seekers & Sensors Department. This team is integral to the success of complex weapon programmes, providing specialist EO design expertise across all stages of development, from specification and assessment to delivery and ongoing support. The department also leads innovative research and development to support future technologies. In this role, you will be part of a dedicated project team developing cutting-edge EO Seekers & Sensors for advanced weapon systems.

You will play a key role in shaping the technical direction of products, collaborating with internal experts and external partners to ensure successful delivery. This is a varied and dynamic position within a highly skilled team, offering plenty of opportunities for professional development. The company is committed to supporting your growth and ensuring a healthy work-life balance while working on industry-leading technologies.

Responsibilities

• Drive the technical direction of EO Seekers & Sensors development to meet customer requirements.
• Collaborate with internal and external stakeholders to ensure the successful delivery of project commitments.
• Lead and coordinate system design activities, ensuring alignment with programme objectives.
• Manage engineering work packages, including co-ordination with other disciplines and subject matter experts.
• Oversee the delivery of systems proving, design assurance, and certification.
• Apply engineering processes to ensure the development of high-quality, complex systems.
• Support research and development initiatives for future emerging technologies.
• Contribute to AGILE team activities and apply AGILE frameworks effectively.
• Ensure compliance with relevant defence, military, or aerospace standards.

Qualifications - A well-rounded Systems Engineer with any of the following skills and experience:

• Requirements analysis, specifications and justification
• System architecture design and modelling
• System trade studies to inform design decisions
• Systems proving, design assurance and certification

If this opportunity aligns with your skills and career goals, please contact Keelan ASAP or apply via this advert!

*Due to the nature of the industry and the job classification, all candidates are required to have British Citizenship, or dual nationality inclusive of British Citizenship, prior to applying*

We endeavour to respond to every candidate; however, if you have not heard from us within 10 days, please assume that you have been unsuccessful or that the position has been filled. Feel free to call the office or send an email to discuss other potential opportunities.

Senior Systems Engineer
Bristol - Hybrid
Up to £45 per hour
OUTSIDE IR35

A Senior Systems Engineer is required to work with a global engineering and consulting group specializing in delivering advanced solutions across aerospace, defense, automotive, and rail industries. With a strong presence in over nine countries and known for its expertise in aircraft interiors, cockpit systems, and mobility technologies, it supports sustainable and high-value engineering programs worldwide.

As a Senior Systems Engineer, you will take a lead role in requirements engineering and systems development for cutting-edge aerospace projects. You will ensure system and subsystem requirements are complete, traceable, and aligned with programme goals.

Requirements:

• 7+ years' experience in systems or requirements engineering, ideally within aerospace R&T / R&D .
• Expert knowledge of Codebeamer (5+ years) for managing and structuring requirements.
• Strong experience with DOORS/Polarion.
• Strong background in systems engineering principles and early-stage development.
• Experience developing Verification & Validation (V&V) requirements framework strategy

Ready to elevate your career? Join a pioneering team where your expertise in requirements engineering will directly shape the success of future aerospace technologies .

Mission:

The Systems Engineer is part of the engineering team that develops marine navigation and bridge systems for OSI’s government and naval markets. The Systems Engineer plays a critical role in the development of the overall system requirements’ design and definition for OSI’s complex products. The Systems Engineer will execute various system engineering functions throughout the life cycle of the project. The incumbent has experience in working with various organizations and system components (software engineering, hardware engineering, integration and test, production, manufacturing and logistics) and can take on the technical lead of a project.

Responsibilities:

• Assists senior engineers in developing design concepts and generates technical proposal material in response to Request for Quotation (RFQ)
• Develops system designs, performs functional analysis, defines systems architecture, defines interfaces and specification, performs trade-studies and documents the design by writing SSDD, ICDs, SRS
• Performs requirement analysis, traceability and maintenance of requirements
• Identifies, analyzes and resolves program support deficiencies and recommends actions
• Designs to government standards, including Military and IMO standards, ensuring ongoing compliance and adherence to requirements
• Attends and participates in customer design reviews and acceptance events
• May participate in system integration tests, trials, and acceptance tests at customer facilities
• Writes acceptance test procedures
• Manages scope of work, schedules work, estimates effort and costs, and identifies technical risks; effectively communicates status on a regular basis to management

Knowledge and Qualifications:

• Degree in Engineering or Physics, Engineering or related field or equivalent experience; eligible for registration as a Professional Engineer in Canada an asset
• 4 years’ engineering experience, Minimum 3 years’ experience in Systems Engineering; Experience in marine electronics and integrated bridge systems a significant asset; experience in defense or government domain preferably in naval ship sector a significant asset
• Proven track record in the timely delivery of engineering related projects; Strong knowledge of marine navigation and tactical sensors or systems; Excellent knowledge of Systems Engineering principles, standards and best practices; Working experience in network design and architecture; Excellent communication and interpersonal skills; Familiarity with requirements and verification management tools such as DOORS; Knowledge of safety engineering and human factors engineering is an asset.
• Eligible to obtain and maintain a location relevant security clearance

What we offer:

• Work with a talented and supportive international team in an exciting, growing industry
• Diversity, equality, and inclusion are more than just buzzwords at OSI – our team is recruited from all over the world and works in constant exchange with one another
• We invest in your professional development – together, we’ll assess your skills and plan how to take you to the next level
• Competitive salary with annual salary review
• Flexible working hours to ensure a perfect work-life balance