DI Jobs
  • Home
  • Search Jobs
  • Job Board Advertising Packages
  • Post a Job
  • Sign in
  • Sign up
  • Home
  • Search Jobs
  • Job Board Advertising Packages
  • Post a Job

Refine Search
Current Search
Engineering Onsite principal senior systems engineer
Refine by Categories
Executive & Management  (4) Information Technology  (2) Other  (1)
Refine by Job Type
Permanent  (23) Full Time  (5) Contract  (2)
Refine by Salary Range
£100,000 - £150,000  (1) £150,000 - £200,000  (1)
Refine by County
Greater London  (8) Buckinghamshire  (2) Hertfordshire  (2) Oxfordshire  (2) West Sussex  (2) Belfast  (1)
Bristol City  (1) Derby  (1) England  (1) Glasgow City  (1) Greater Manchester  (1) Hampshire  (1) Lancashire  (1) Lincolnshire  (1) Somerset  (1) South Gloucestershire  (1) Staffordshire  (1) Warrington  (1) West Midlands  (1)
More
Eden Brown
28 Apr, 2026
Permanent
Senior Mechanical Design Engineer - HVAC - 20% Bonus
Eden Brown 39 Holloway Rd, London N7 8JP, UK
Senior Mechanical Design Engineer - Building Services - 20% Bonus Central London Flexible Working Up to 75k + 20% Basic Salary Bonus, 28 days annual leave & Benefits About Our Client: Our client is a growing Building Services Engineering Consultancy located in the bustling streets of Central London. Established in 2020, They have quickly become a 10 strong team, delivering exceptional work through strong client relationships within the commercial space. They are currently seeking a highly skilled Senior or Principal Mechanical Engineer to join the design team. You will lead on two specific projects. One will be the creation of a new nightclub in a 1930's theatre. The other will be a fulfilment centre within a large industrial unit for a very well known sports brands. Besides these two specific projects the business is know for commercial office real estate and restaurants/bars. Collaborating with a small and dynamic team of design engineers, electrical...
citi
26 Apr, 2026
Full Time
Principal Software Engineer - Margin Technology – Senior Vice President
citi London, UK
Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. What We do / The Team: Markets Operations Technology is going through an exciting phase of transformation in margin and collateral domain. We are re‑engineering our technology estate to achieve world‑leading performance and resiliency, enabling new capabilities in advanced execution, global market...
Thales
26 Apr, 2026
Full Time
Technical Manager / Principal Systems Engineer with Naval communications experience
Thales Crawley, UK
Location: Crawley, United Kingdom Thales people architect solutions at the heart of the defence-security continuum. Interoperable and secure information and telecommunications systems for defence, security, and civil operators, are based upon innovative use of radiocommunications, networks, and cybersecurity. We are ground breaking new digital technologies such as 4G mobile communications, cryptography, cloud computing and big data for use in physical protection systems, and critical information systems. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer. We innovate across the major industries of Aerospace, Defence, Security and Space. Your health and well-being matters to us and that’s why we offer you the flexibility to do what’s important to you; whether...
Thales
26 Apr, 2026
Full Time
Senior Systems Engineer
Thales Crawley, UK
Location: Crawley, United Kingdom Thales people provide armed forces customers with operational advantage at every decisive moment throughout the mission. Defence and armed forces customers rely on us to deliver the full range of defence mission systems solutions at land, sea, and air. Our platforms extend across the battlespace including Above and Sonar, Electronic Combat, and Intelligence, Surveillance and Reconnaissance systems. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer. We innovate across the major industries of Aerospace, Defence, Security and Space. Your health and well-being matters to us and that’s why we offer you the flexibility to do what’s important to you; whether that’s part time hours, job sharing, home working, or the ability to flex...
Thales
26 Apr, 2026
Full Time
Field Service Engineer
Thales Glasgow, UK
Location: Glasgow, United Kingdom Thales people provide armed forces customers with operational advantage at every decisive moment throughout the mission. Defence and armed forces customers rely on us to deliver the full range of defence mission systems solutions at land, sea, and air. Our platforms extend across the battlespace including Above and Sonar, Electronic Combat, and Intelligence, Surveillance and Reconnaissance systems. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer. We innovate across the major industries of Aerospace, Defence, Security and Space. Your health and well-being matters to us and that’s why we offer you the flexibility to do what’s important to you; whether that’s part time hours, job sharing, home working, or the ability to flex...
Matchtech
23 Apr, 2026
Permanent
Stress Engineer
Matchtech Hertfordshire, UK
Important: All applicants must be able to obtain Security Clearance and must hold British Nationality as their sole/primary nationality. Working: The role offers flexible working but does require engineers on site for a minimum of 3 days per week and is on a secure site where SC clearance is needed. - Due to increased workload, one of our major defence clients is looking for experienced stress engineers to lead the structural design and development of a next-generation complex projects. The Stress Engineers will collaborate closely with multi-disciplinary teams across our UK sites to develop an advanced aerospace structural solution. The team is responsible for the structural and thermal performance of military systems. And will deliver structural and thermal analysis expertise across the whole product lifecycle from studies in the early concept stage and detailed development of engineering designs to manufacturing concessions and in-service support. This role can...
Advance TRS
21 Apr, 2026
Permanent
Associate Director / Principal OHL Design Engineer
Advance TRS Birmingham, UK
My client is seeking an Associate Director or Principal Engineer (OHL) to join their growing Transmission & Distribution team. You'll be part of an ambitious organisation delivering world-class engineering design on some of the most exciting and complex energy infrastructure projects in the country. The Opportunity My client's Transmission & Distribution Engineering division provides end-to-end services across power systems analysis, substations, cabling, overhead lines, and HVDC systems - supporting the UK's transition to a net zero grid. As part of this team, you'll contribute to major national projects that form part of a multi-billion-pound programme to strengthen the UK grid, integrating renewable generation and enhancing long-distance power transmission capability. What You'll Do As a senior member of the OHL team, you'll bring your expertise and leadership to a range of technically challenging and high-profile projects: Lead the delivery of overhead...
DCS Recruitment Limited
18 Apr, 2026
Permanent
Principle Hardware Engineer
DCS Recruitment Limited Stafford, UK
Principal Hardware Engineer Location: Stafford (Hybrid - 3 days per week in the office) Salary: Up to 65,000 (depending on experience) Contract: Full-time About the Role We are seeking an experienced Principal Hardware Engineer to take full technical ownership across a portfolio of complex engineering projects within the nuclear and defence sectors. This is a senior leadership role combining deep technical expertise with responsibility for project delivery, team leadership, and continuous improvement. You will lead and mentor engineering teams, ensure projects are delivered on time and within budget, and maintain the highest standards of safety, quality, and compliance in a highly regulated environment. Key Responsibilities Lead engineering delivery across multiple concurrent projects Take technical ownership to ensure scope, cost, schedule and quality targets are met Line manage, mentor and develop engineers, providing technical leadership and direction...
Eden Brown
18 Apr, 2026
Permanent
Senior Electrical Design Engineer
Eden Brown London, UK
Senior Electrical Design Engineer London Multidisciplinary Consultancy Sustainable Design Looking for a role where you can lead projects, work across multiple disciplines, and deliver genuinely sustainable design solutions? This is an opportunity to join a well-established multidisciplinary consultancy with a strong reputation across the UK for delivering high-quality engineering, environmental, and sustainability services. Their collaborative approach brings together engineers, environmental specialists, and designers to create efficient, low-carbon buildings across a wide range of sectors. They're now looking to appoint a Senior Electrical Design Engineer to strengthen their London team. The Role You'll take the lead on electrical design across a diverse portfolio of projects, working closely with internal teams and external stakeholders to deliver coordinated, high-quality solutions. You will: - Lead electrical design delivery from concept through...
Eden Brown
15 Apr, 2026
Permanent
Senior Electrical Engineer - Design Led Consultancy
Eden Brown 39 Holloway Rd, London N7 8JP, UK
Senior / Principal Electrical Design Engineer London Building Services Consultancy Design-Led Projects Looking for a role where you can lead projects, work closely with clients, and be part of a growing, people-first consultancy? This is an opportunity to join a forward-thinking building services consultancy delivering high-quality, design-led engineering across sectors including commercial, residential, education, healthcare, and more. With a strong pipeline of work and ambitious growth plans, they're looking to strengthen their London team with a Senior or Principal Electrical Engineer. The Opportunity This role is ideal for someone who wants more ownership, more client exposure, and a clear route into leadership. You'll play a key role in delivering projects, shaping electrical design strategies, and supporting the growth of the team - all within a business that values flexibility and development. What You'll Be Doing Leading electrical design delivery...
Eden Brown
15 Apr, 2026
Permanent
Senior - Principal Public Health Engineer
Eden Brown London, UK
Senior / Principal Public Health Engineer City of London Hybrid Working Up to 75k Looking for a role where you can lead projects, influence design, and work on genuinely sustainable developments? This is an opportunity to join a well-established, multidisciplinary building services consultancy with a strong presence across the UK. Known for their collaborative approach and commitment to sustainable design, they deliver high-quality engineering across sectors including commercial, residential, healthcare, education, and more. They're now looking to appoint a Senior or Principal Public Health Engineer to strengthen their London team. The Opportunity This role is ideal for someone who wants to take ownership of projects, work closely with clients, and play a key role in a growing team. You'll be a central figure in delivering innovative public health design solutions, while helping to shape the direction of projects and supporting the development of junior...
Eden Brown
15 Apr, 2026
Permanent
Senior - Principal Electrical Engineer
Eden Brown London, UK
Senior - Principal Electrical Design Engineer City of London Hybrid Working Up to 75k London Building Services Consultancy Design-Led Projects If you're an experienced Electrical Design Engineer looking for more ownership, better projects, and a stronger voice in design - this is worth a look. This consultancy is known for delivering high-quality, design-led building services engineering, working closely with architects on projects where detail, creativity, and technical excellence are equally valued. Their portfolio spans a range of sectors, with a strong focus on well-crafted, architecturally led schemes. They're now looking for a Senior to Principal Electrical Design Engineer to take a leading role in project delivery and client engagement. The Role You'll play a key role in shaping projects from concept through to completion, with the autonomy to influence both design and delivery. You will: Lead electrical design delivery across a variety of projects...
Eden Brown
15 Apr, 2026
Permanent
Senior / Principal / Associate Mechanical Design Engineer
Eden Brown Oxford, UK
Senior / Principal / Associate Mechanical Design Engineer Oxfordshire Hybrid Working 9 Day Fortnight Up to 75k Looking for a role where you can lead projects, influence clients, and still have a genuine work-life balance? This is an opportunity to join a growing, design-focused building services consultancy with a strong reputation for delivering high-quality engineering across a diverse range of sectors. With ambitious plans and a close-knit team, they're now looking to appoint a senior mechanical hire to play a key role in their Oxford office. The Opportunity This role is ideally suited to someone operating at Principal or Associate level (or a strong Senior ready to step up), who wants more ownership, visibility, and progression. You'll take the lead on projects, act as a key client contact, and help shape the growth of the team - all within a business that genuinely supports its people. What You'll Be Doing Leading mechanical design delivery from...
Mars Recruitment
15 Apr, 2026
Permanent
Principal Electronics Engineer
Mars Recruitment Booker, High Wycombe, Marlow SL7, UK
Principal Electronics Engineer High Wycombe Hybrid £72,000pa plus benefits: Are you a Senior or Principal Electronics Engineer who has a scientific or engineering mind? Would you like to own and manage the electronics hardware development of a world-leading scientific instrumentation product? Our client has been at the forefront of technical innovation for over 50 years. Their ground-breaking products are used worldwide and as they go from strength to strength, they are looking for a Principal Electronics Engineer to join their highly talented electronics engineering team. On a day-to-day basis, your focus will be the design and development of electronics hardware for a specific product line. You will become the subject matter expert for this product, coordinating design reviews, testing to validate systems, and support the product with any customer queries. Please note that your specific product is manufactured in Santa Barbara, so there may be some international...
Thales
15 Apr, 2026
Full Time
Senior/Principal Firmware Engineer/ Firmware Architect
Thales Belfast, UK
Location: Belfast, United Kingdom Thales is a global technology leader with more than 83,000 employees on five continents. With over 7,500 people in the UK, operating across defence, space, aerospace, and digital security, we help build a future we can all trust. Thales supports the security and stability of our nation by providing extraordinary technology to our customers, as well as delivering social value to the UK with our products and services. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer. We innovate across the major industries of Aerospace, Defence, Security and Space. Your health and well-being matters to us and that’s why we offer you the flexibility to do what’s important to you; whether that’s part time hours, job sharing, home working, or...
Aldwych Consulting
09 Apr, 2026
Permanent
Senior/Principal Electrical Engineer
Aldwych Consulting Bristol, UK
Senior / Principal Electrical Design Engineer - Critical Infrastructure Bristol (Hybrid Working) I'm working with a globally recognised engineering consultancy looking to appoint a Senior or Principal Electrical Design Engineer into their growing Building Design team in Bristol. This business operates at the cutting edge of major infrastructure, defence, and energy projects , with a strong reputation for delivering technically complex schemes across the UK and internationally. Their work spans sectors including energy, defence, aviation, healthcare, and commercial , with a growing focus on decarbonisation and sustainable design . This is a fantastic opportunity for someone looking to step into a role with real project ownership , technical influence, and clear progression within a highly respected organisation. The Role You'll play a key role in the delivery of electrical design across a range of high-profile and technically challenging projects, particularly...
Calibre Search
03 Apr, 2026
Permanent
Senior / Principal Mechanical Building Services Engineer
Calibre Search Woolston, Warrington, UK
Senior / Principal Mechanical Building Services Engineer Warrington 50,000 - 65,000 DOE + Benefits We're working with a growing integrated MEP and building physics consultancy with offices in Yorkshire and the North West. They deliver mechanical, electrical, and sustainability design across a broad range of sectors, residential, commercial, education, industrial, and retail - and they're looking for a Senior or Principal Mechanical Engineer to join their expanding team. This is a consultancy that does things properly. Design continuity runs all the way through to site, so you'll actually see your work get built - not hand it off at Stage 3 and move on. They have a real emphasis on buildability from the earliest design stages, and the business is fully digitally operational with Revit Coordinators working alongside the engineering team on every project. At Senior level, you'll be taking ownership of mechanical design across a live and varied project portfolio, working...
Astute People
03 Apr, 2026
Permanent
Principal Integrity Engineer (Pressure Systems)
Astute People Derby, UK
Astute's Power Team are working with a global technical services and engineering consultancy to recruit for a Principal Integrity Engineer, specialising in Pressure Systems, to join their expanding Asset Integrity management team. This is a senior, permanent opportunity where you'll lead the delivery of high-value engineering solutions, supporting major clients across the Conventional Power and Clean Energy sectors - including CCGT, Biomass and Energy from Waste facilities. Candidates must have a degree in a relevant field, have at least 5 - 10 years Power Generation experience and be a Subject Matter Expert in PSSR / Asset Integrity / Mechanical Plant. If you would like to discuss this role & the package available, please get in touch. Responsibilities and duties of the Principal Integrity Engineer role: You will be responsible for: Carrying out integrity assessments of defective or degraded power plant components operating at both low and high temperatures, using...
Mars Recruitment
03 Apr, 2026
Permanent
Principal Electronics Hardware Engineer
Mars Recruitment Booker, High Wycombe, Marlow SL7, UK
Principal Electronics Hardware Engineer High Wycombe Hybrid £72,000pa plus benefits: Are you a Senior or Principal Electronics Hardware Engineer who has a scientific or engineering mind? Would you like to own and manage the electronics hardware development of a world-leading scientific instrumentation product? Our client has been at the forefront of technical innovation for over 50 years. Their ground-breaking products are used worldwide and as they go from strength to strength, they are looking for a Principal Electronics Hardware Engineer to join their highly talented electronics engineering team. On a day-to-day basis, your focus will be the design and development of electronics hardware for a specific product line. You will become the subject matter expert for this product, coordinating design reviews, testing to validate systems, and support the product with any customer queries. Please note that your specific product is manufactured in Santa Barbara, so there...
Calibre Search
24 Apr, 2026
Permanent
Senior/Principal Highway Engineer
Calibre Search Basingstoke, UK
A leading independent transport planning & highway engineering consultancy is seeking a Senior/Principal Highways Engineer to join its team in Basingstoke. With a strong national presence and a reputation for delivering innovative solutions to complex transport challenges, this consultancy offers an excellent platform for experienced professionals looking to take the next step in their career. The Opportunity This is a key leadership role where you will drive the delivery of complex highway design projects, provide technical direction, and play an active role in business growth. You will work closely with senior stakeholders, manage high-profile projects, and lead multidisciplinary teams across a diverse project portfolio. Key Responsibilities Lead highway design projects from feasibility through to detailed design Provide technical leadership and act as a key problem-solver on complex schemes Oversee project delivery, including budgets, resourcing, and programme...
  • Home
  • About Us
  • Recruitment Blog
  • Terms & Conditions
  • Privacy & Cookies Policy
  • Employer
  • Post a Job
  • Job Board Advertising Packages
  • Diversity, Inclusion & Equality (ED&I) Articles
  • Sign in
  • Contact Us | Recruiters
  • Job Seeker
  • Find Jobs
  • Upload CV
  • Job Seeker Help & Advice
  • Equal Opportunities Monitoring Form
  • Sign in
  • Contact Us | Jobseeker
  • Facebook
  • X / Twitter
  • LinkedIn
© 2026 DIjobs Limited  |  3rd Floor, 86-90 Paul Street, London EC2A 4NE  |  Company Registration: 13316146  |  VAT No: GB 377358650
Diversity Job Board | Inclusion | Equality | ED&I | DEI | EDI | D&I | DEIB | IDEA | BDI | Jobboard | Vacancies | Diversity Jobs | Careers | Jobsite | Diversity and Inclusion Job Boards | Find a New Job | Job Search with DIjobs