https://jobs.co.uk/jobs-results?Keyword=Principal%20Software%20Engineer&RadiusMiles=10 RSS feed for Principal Software Engineer Jobs. en-gb Thu, 23 Jul 2026 20:08:20 GMT https://jobs.co.uk/job/principal-software-engineer-jonathan-lee-recruitment-ltd--3ad01e31-7149-4f2b-b0ee-dd01da004f88 https://jobs.co.uk/job/principal-software-engineer-jonathan-lee-recruitment-ltd--3ad01e31-7149-4f2b-b0ee-dd01da004f88 Thu, 23 Jul 2026 11:53:15 GMT Location: Berkshire | Salary: 70000.00-70000.00 Annual | Type: Permanent | Step into a world where innovation meets impact. This Principal Software Engineer role offers you the chance to be a part of cutting-edge defence technology, driving advancements that redefine security and protect lives. Working in a dynamic and collaborative environment, you''ll lead projects that make a real difference, while enjoying excellent benefits such as private medical cover, flexible working hours, and participation in an annual bonus scheme. If you''re ready to shape the future of defence systems by leading the design, architecture, and delivery of secure embedded and application software within advanced cyber and defence programmes. You ll work across the full software lifecycle from requirements and system design through to implementation, testing, and deployment while ensuring high standards in performance, security, and reliability. The position includes technical leadership of small engineering teams, mentoring junior developers, and contributing to multiple concurrent projects with varying scales and complexity. You ll apply modern development practices such as object-oriented design, DevSecOps, and continuous integration, while also supporting bids, cost estimati... Permanent https://jobs.co.uk/job/principal-software-engineer-raytheon--c801f2a8-c4d3-46f3-81f9-6e42b9067185 https://jobs.co.uk/job/principal-software-engineer-raytheon--c801f2a8-c4d3-46f3-81f9-6e42b9067185 Thu, 23 Jul 2026 11:52:41 GMT Location: Gloucester | Salary: 10000-500000 Annual | Type: Permanent | Raytheon UK have a full time, permanent opportunity for a Principal Software Engineer to join our team on our Manchester or Gloucester sites within a hybrid working pattern.As Principal Software Engineer, you have the opportunity to focus on technical work or have a mixture of technical focus and people management focus - guiding and developing our more junior members of the team click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--e0a36de7-acaf-407f-bf8e-68953ed6c76c https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--e0a36de7-acaf-407f-bf8e-68953ed6c76c Thu, 23 Jul 2026 11:52:41 GMT Location: High Wycombe | Salary: 90000.00-90000.00 Annual | Type: Permanent | Are you looking for a fantastic Principal Software Engineer opportunity in High Wycombe?If so, my client is currently recruiting for a Principal Software Engineer to join their RandD site in High Wycombe, BuckinghamshireMy client design and manufacture a range of products and systems focusing on Instrumentation, but you do need a strong background in embedded software and architecture click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-platform-recruitment-limited--4c5fd05c-535a-4bb8-aff2-532481f811ea https://jobs.co.uk/job/principal-software-engineer-platform-recruitment-limited--4c5fd05c-535a-4bb8-aff2-532481f811ea Thu, 23 Jul 2026 11:52:37 GMT Location: Cambridge | Salary: 80000.00-80000.00 Annual | Type: Permanent | Title: Principal Software Engineer Role: Distributed Systems and Communications Location: Cambridgeshire Salary: £60-£80kPlatform Recruitment has partnered with an innovative technology company developing mission-critical systems used by organisations worldwide. They''re looking for a Principal Software Engineer to help shape the technical direction of their platform click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-java-spring-boot-aws-client-server--66493e7f-34a4-43c9-a4c6-cf8ce2d6fade https://jobs.co.uk/job/principal-software-engineer-java-spring-boot-aws-client-server--66493e7f-34a4-43c9-a4c6-cf8ce2d6fade Wed, 22 Jul 2026 23:00:00 GMT Location: City of London | Salary: £100,000 | Type: Permanent | Principal Software Engineer / Developer (Java Spring Boot AWS) London / WFH to £120k Are you an experienced Java focussed Software Engineer, with technical project leadership and client facing skills? You could be progressing your career at a global technology consultancy. As a Principal Software Engineer you will lead client projects, often long term technical transformations, designing, developing ... Permanent https://jobs.co.uk/job/principal-software-engineer-sirius-digital--80b2f605-a180-471e-b864-734d4e65ffad https://jobs.co.uk/job/principal-software-engineer-sirius-digital--80b2f605-a180-471e-b864-734d4e65ffad Wed, 22 Jul 2026 23:00:00 GMT Location: Portsmouth | Salary: benefits, pension (7% contribution), 25 days holiday & life insurance | Type: Permanent | Principal Software Engineer Salary: Negotiable plus benefits, pension (7% contribution), 25 days holiday and life insurance We are looking for principal software engineers with diverse experience. We are a small but rapidly growing consultancy, owned highly experienced and recognised practitioners in UK defence consultancy. We are looking for candidates with a mix of technical expertise and interpersona... Permanent https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--f685dc14-13c1-4e03-9f74-5effb5799bf8 https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--f685dc14-13c1-4e03-9f74-5effb5799bf8 Wed, 22 Jul 2026 11:52:00 GMT Location: Loughborough | Salary: 10000-500000 Annual | Type: Permanent | Are you a Principal Software Engineer with a strong background in DSP, embedded software and developing 5G communications applications?If so I''d like to speak with you!A well-established RandD organisation and market leader is looking to rapidly expand its engineering team and is seeking a Principal Software Engineer to provide technical leadership within its development team near Leicestershire click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-verifile-ltd--5f982099-dd0f-4458-85ee-5415269d9fe9 https://jobs.co.uk/job/principal-software-engineer-verifile-ltd--5f982099-dd0f-4458-85ee-5415269d9fe9 Tue, 21 Jul 2026 11:52:12 GMT Location: Bedford | Salary: 85000.00-85000.00 Annual | Type: Permanent | Principal Software EngineerHybrid Who we are?Verifile is an award-winning leading provider of CV verification and background screening services using innovative technology and methodology. We carry out background checks on candidates to enable our clients to make informed and long-term rewarding recruitment decisions click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--db469d52-7770-40c6-b4cf-842cb87defc3 https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--db469d52-7770-40c6-b4cf-842cb87defc3 Mon, 20 Jul 2026 23:00:00 GMT Location: High Wycombe | Salary: £90,000 | Type: Permanent | Are you looking for a fantastic Principal Software Engineer opportunity in High Wycombe? If so, my client is currently recruiting for a Principal Software Engineer to join their RandD site in High Wycombe, Buckinghamshire My client design and manufacture a range of products and systems focusing on Instrumentation, but you do need a strong background in embedded software and architecture. Main requireme... Permanent https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--c512e09b-0ee8-4f07-b671-05a8e3cb9d6f https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--c512e09b-0ee8-4f07-b671-05a8e3cb9d6f Mon, 20 Jul 2026 23:00:00 GMT Location: Loughborough | Salary: Negotiable | Type: Permanent | Are you a Principal Software Engineer with a strong background in DSP, embedded software and developing 5G communications applications? If so I''d like to speak with you! A well-established RandD organisation and market leader is looking to rapidly expand its engineering team and is seeking a Principal Software Engineer to provide technical leadership within its development team near Leicestershire. As ... Permanent https://jobs.co.uk/job/principal-software-engineer-raytheon--70f2ea89-0739-4bbb-9f3c-44030d5dd127 https://jobs.co.uk/job/principal-software-engineer-raytheon--70f2ea89-0739-4bbb-9f3c-44030d5dd127 Mon, 20 Jul 2026 11:51:02 GMT Location: Manchester | Salary: 10000-500000 Annual | Type: Permanent | Raytheon UK have a full time, permanent opportunity for a Principal Software Engineer to join our team on our Manchester or Gloucester sites within a hybrid working pattern.As Principal Software Engineer, you have the opportunity to focus on technical work or have a mixture of technical focus and people management focus - guiding and developing our more junior members of the team click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-verifile-ltd--7afa7a06-b16a-4127-a139-f2f0ab4adb23 https://jobs.co.uk/job/principal-software-engineer-verifile-ltd--7afa7a06-b16a-4127-a139-f2f0ab4adb23 Fri, 17 Jul 2026 23:00:00 GMT Location: Bedford | Salary: £85,000 | Type: Permanent | Principal Software Engineer Hybrid Who we are? Verifile is an award-winning leading provider of CV verification and background screening services using innovative technology and methodology. We carry out background checks on candidates to enable our clients to make informed and long-term rewarding recruitment decisions. As a Principal Software Engineer, you will play a key role in shaping the future o... Permanent https://jobs.co.uk/job/principal-software-engineer-raytheon--95bcded3-831c-42e5-84a1-0c1ac686997c https://jobs.co.uk/job/principal-software-engineer-raytheon--95bcded3-831c-42e5-84a1-0c1ac686997c Fri, 17 Jul 2026 23:00:00 GMT Location: Gloucester | Salary: Negotiable | Type: Permanent | Raytheon UK have a full time, permanent opportunity for a Principal Software Engineer to join our team on our Manchester or Gloucester sites within a hybrid working pattern. As Principal Software Engineer, you have the opportunity to focus on technical work or have a mixture of technical focus and people management focus - guiding and developing our more junior members of the team. Either way, you''... Permanent https://jobs.co.uk/job/principal-software-engineer-raytheon--62fecd0f-b0e1-47da-9370-82756946bff9 https://jobs.co.uk/job/principal-software-engineer-raytheon--62fecd0f-b0e1-47da-9370-82756946bff9 Fri, 17 Jul 2026 23:00:00 GMT Location: Manchester | Salary: Negotiable | Type: Permanent | Raytheon UK have a full time, permanent opportunity for a Principal Software Engineer to join our team on our Manchester or Gloucester sites within a hybrid working pattern. As Principal Software Engineer, you have the opportunity to focus on technical work or have a mixture of technical focus and people management focus - guiding and developing our more junior members of the team. Either way, you''... Permanent https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--c3729b24-f7bb-492c-af24-0a42fb108da7 https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--c3729b24-f7bb-492c-af24-0a42fb108da7 Fri, 17 Jul 2026 11:52:03 GMT Location: Hathern | Salary: 10000-500000 Annual | Type: Permanent | Are you a Principal Software Engineer with a strong background in DSP, embedded software and developing 5G communications applications? If so I''d like to speak with you! A well-established RandD organisation and market leader is looking to rapidly expand its engineering team and is seeking a Principal Software Engineer to provide technical leadership within its development team near Leicestershire. As a Principal Software Engineer, you will take technical ownership of complex embedded software and DSP development activities, supporting the design and implementation of advanced communications systems. The successful candidate will bring strong embedded/bare-metal software experience, a deep understanding of digital signal processing, and proven capability in implementing communication signal processing algorithms such as DDCs, filters and FFTs. Skills/Experience required for the Principal Software Engineer job based near Leicestershire include:BEng/BSc or MSc/MEng within Engineering, ideally Electronics, Telecommunications, Software Engineering or a similar disciplineSignificant experience in DSP algorithm simulation, embedded software development and 5G communications systemsStron... Permanent https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--eae17b65-fd78-47d6-bd1f-3f7f8824c801 https://jobs.co.uk/job/principal-software-engineer-redline-group-ltd--eae17b65-fd78-47d6-bd1f-3f7f8824c801 Thu, 16 Jul 2026 23:00:00 GMT Location: Hathern | Salary: Negotiable | Type: Permanent | Are you a Principal Software Engineer with a strong background in DSP, embedded software and developing 5G communications applications? If so I''d like to speak with you! A well-established R&D organisation and market leader is looking to rapidly expand its engineering team and is seeking a Principal Software Engineer to provide technical leadership within its development team near Leicestershire. As a Principal Software Engineer, you will take technical ownership of complex embedded software and DSP development activities, supporting the design and implementation of advanced communications systems. The successful candidate will bring strong embedded/bare-metal software experience, a deep understanding of digital signal processing, and proven capability in implementing communication signal processing algorithms such as DDCs, filters and FFTs. Skills/Experience required for the Principal Software Engineer job based near Leicestershire include: BEng/BSc or MSc/MEng within Engineering, ideally Electronics, Telecommunications, Software Engineering or a similar discipline Significant experience in DSP algorithm simulation, embedded software development and 5G communic... Permanent https://jobs.co.uk/job/principal-software-engineer-cv-library-ltd--190ac828-7e21-468f-ada5-42586ea141e1 https://jobs.co.uk/job/principal-software-engineer-cv-library-ltd--190ac828-7e21-468f-ada5-42586ea141e1 Thu, 16 Jul 2026 11:52:34 GMT Location: Fleet | Salary: 10000-500000 Annual | Type: Permanent | At CV-Library, we have a simple vision: to help the world to work and we are looking for exceptional and talented people to help us realise this vision in both UK and overseas markets. We are in a period of focused internal investment, following a year of key strategic acquisitions and significant investment across all parts of the business, from Tech and Data to People and HR, there''s never been a more exciting time to join us or a better place to grow your career!The RoleHours: Monday-Friday, 9:00-17:30Location: Fleet Working Pattern: Hybrid - twice a quarterWe are looking for a Principal Software Engineer to provide technical leadership across our application estate. Following our multi-year re-platforming, our backend is now a collection of RESTful microservices managing state for our core data entities - meaning the majority of our business logic and product complexity now lives in our Next.js web client and React Native mobile app. This role carries ongoing influence over how those applications are built and evolve. This role is centred on driving alignment across teams and systems - owning the interface lifecycle (API specifications and event schemas), setting and managing ... Permanent https://jobs.co.uk/job/principal-software-engineer-100k-10-bonus-morson-edge--1136db38-4584-42c1-ac8c-0f26c12dfa57 https://jobs.co.uk/job/principal-software-engineer-100k-10-bonus-morson-edge--1136db38-4584-42c1-ac8c-0f26c12dfa57 Wed, 15 Jul 2026 11:52:25 GMT Location: Manchester | Salary: 100000.00-100000.00 Annual | Type: Permanent | Principal Software Engineer (£100k + 10% bonus)Great opportunity for a Principal Software Engineer to work for a retail company near Manchester going through a digital transformation.This role is onsite 3-4 days per week so we''re looking for people who enjoy in person collaboration in a fast-paced and challenging work environment click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineer-matchtech--b2409ec9-eb7a-43b9-959c-8cfb9b168557 https://jobs.co.uk/job/principal-software-engineer-matchtech--b2409ec9-eb7a-43b9-959c-8cfb9b168557 Wed, 15 Jul 2026 11:52:19 GMT Location: Maidenhead | Salary: 10000-500000 Annual | Type: Permanent | Matchtech are working closely with a UK defence technology organisation delivering secure communications and cyber solutions used in mission-critical environments. Their teams build high-assurance cryptographic and key management capabilities that enable the confidential exchange of sensitive information for customers operating across tactical and strategic settings.If you enjoy solving hard engineering problems where security, reliability, and real-world outcomes matter, this is a good fit. Important informationClearanceDue to the nature of the work, applicants will need to meet UK security clearance eligibility requirements (including UK residency criteria).DV clearance is required (you must be eligible and willing to obtain and maintain DV; SC is typically required first).Working arrangementFully onsite: please only apply if you can work onsite in MaidenheadThe role You''ll provide technical leadership in a software engineering team (typically 5 to 20 engineers) delivering multiple concurrent RandD and production programmes. The focus is on embedded and/or application software in secure environments, with end-to-end ownership across the software lifecycle (requirements through d... Permanent https://jobs.co.uk/job/principal-software-engineer-cv-library-ltd--73de15de-d75e-463d-8f17-ad10174c87df https://jobs.co.uk/job/principal-software-engineer-cv-library-ltd--73de15de-d75e-463d-8f17-ad10174c87df Tue, 14 Jul 2026 23:00:00 GMT Location: Fleet | Salary: Negotiable | Type: Permanent | At CV-Library, we have a simple vision: to help the world to work and we are looking for exceptional and talented people to help us realise this vision in both UK and overseas markets. We are in a period of focused internal investment, following a year of key strategic acquisitions and significant investment across all parts of the business, from Tech and Data to People and HR, there''s never been a more exciting time to join us or a better place to grow your career! The Role Hours: Monday-Friday, 9:00-17:30 Location: Fleet Working Pattern: Hybrid - twice a quarter We are looking for a Principal Software Engineer to provide technical leadership across our application estate. Following our multi-year re-platforming, our backend is now a collection of RESTful microservices managing state for our core data entities - meaning the majority of our business logic and product complexity now lives in our Next.js web client and React Native mobile app. This role carries ongoing influence over how those applications are built and evolve. This role is centred on driving alignment across teams and systems - owning the interface lifecycle (API specifications and event schemas), s... Permanent https://jobs.co.uk/job/principal-software-engineer-hyperloop-recruitment--0d1dfc6c-3320-456f-9031-3edec002392d https://jobs.co.uk/job/principal-software-engineer-hyperloop-recruitment--0d1dfc6c-3320-456f-9031-3edec002392d Tue, 14 Jul 2026 11:51:52 GMT Location: Liverpool | Salary: 75000.00-75000.00 Annual | Type: Permanent | Principal Software Engineer£75,000 (DOE) + benefitsLiverpool (hybrid)Hyperloop Recruitment is partnering with a leading Liverpool-based tech firm who are looking for a Principal Software Engineer to join their team. This role would suit a Principal Software Engineer seeking a challenging next step in their career; this is a mix of both hands-on work (TypeScript focused stack) and technical leadershi click apply for full job details Permanent https://jobs.co.uk/job/principal-software-engineering-azure-and-integration-centrica-chp--a52278ed-71da-4007-8477-e1dfc183edcc https://jobs.co.uk/job/principal-software-engineering-azure-and-integration-centrica-chp--a52278ed-71da-4007-8477-e1dfc183edcc Mon, 13 Jul 2026 23:00:00 GMT Location: Windsor | Salary: Negotiable | Type: Permanent | Description Join us, be part of more. We''re so much more than an energy company. We''re a family of brands revolutionising how we power the planet. We''re energisers. One team of 21,000 colleagues that''s energising a greener, fairer future by creating an energy system that doesn''t rely on fossil fuels, whilst living our powerful commitment to igniting positive change in our communities. Here, you ca... Permanent https://jobs.co.uk/job/principal-software-engineer-matchtech--b5eefa8e-5773-4893-a455-24d4f3d956e2 https://jobs.co.uk/job/principal-software-engineer-matchtech--b5eefa8e-5773-4893-a455-24d4f3d956e2 Mon, 13 Jul 2026 23:00:00 GMT Location: Maidenhead | Salary: Negotiable | Type: Permanent | Matchtech are working closely with a UK defence technology organisation delivering secure communications and cyber solutions used in mission-critical environments. Their teams build high-assurance cryptographic and key management capabilities that enable the confidential exchange of sensitive information for customers operating across tactical and strategic settings. If you enjoy solving hard engineering problems where security, reliability, and real-world outcomes matter, this is a good fit. Important information Clearance Due to the nature of the work, applicants will need to meet UK security clearance eligibility requirements (including UK residency criteria). DV clearance is required (you must be eligible and willing to obtain and maintain DV; SC is typically required first). Working arrangement Fully onsite: please only apply if you can work onsite in Maidenhead The role You''ll provide technical leadership in a software engineering team (typically 5 to 20 engineers) delivering multiple concurrent R&D and production programmes. The focus is on embedded and/or application software in secure environments, with end-to-end ownership across the software lifec... Permanent https://jobs.co.uk/job/principal-software-engineer-mobile-centrica-chp--b13a085e-5b82-4fce-9c5f-3e2d2d25cc52 https://jobs.co.uk/job/principal-software-engineer-mobile-centrica-chp--b13a085e-5b82-4fce-9c5f-3e2d2d25cc52 Mon, 13 Jul 2026 23:00:00 GMT Location: Windsor | Salary: Negotiable | Type: Permanent | Description Join us, be part of more. We''re so much more than an energy company. We''re a family of brands revolutionising how we power the planet. We''re energisers. One team of 21,000 colleagues that''s energising a greener, fairer future by creating an energy system that doesn''t rely on fossil fuels, whilst living our powerful commitment to igniting positive change in our communities. Here, you ca... Permanent https://jobs.co.uk/job/principal-software-engineer-100k-10-bonus-morson-edge--3442cfdd-1629-4fd3-a102-95fdaaf298d5 https://jobs.co.uk/job/principal-software-engineer-100k-10-bonus-morson-edge--3442cfdd-1629-4fd3-a102-95fdaaf298d5 Sun, 12 Jul 2026 23:00:00 GMT Location: Manchester | Salary: £100,000 | Type: Permanent | Principal Software Engineer (£100k + 10% bonus) Great opportunity for a Principal Software Engineer to work for a retail company near Manchester going through a digital transformation. This role is onsite 3-4 days per week so we''re looking for people who enjoy in person collaboration in a fast-paced and challenging work environment. You''d report to the Head of Engineering and would work alongside oth... Permanent https://jobs.co.uk/job/principal-software-engineer-platform-recruitment--3d843daf-123b-43de-947c-66d92d7a87bc https://jobs.co.uk/job/principal-software-engineer-platform-recruitment--3d843daf-123b-43de-947c-66d92d7a87bc Sat, 04 Jul 2026 11:51:57 GMT Location: Waterbeach | Salary: 60000.00-60000.00 Annual | Type: Permanent | Title: Principal Software Engineer Role: Distributed Systems and Communications Location: Cambridgeshire Salary: 60- 80k Platform Recruitment has partnered with an innovative technology company developing mission-critical systems used by organisations worldwide. They''re looking for a Principal Software Engineer to help shape the technical direction of their platform. Key Responsibilities: Lead architecture and implementation of systems in C#/.NET Build low-latency applications handling high-volume data traffic Drive technical vision and mentor engineers across the team Oversee code reviews, coding standards and CI/CD pipelines Key Requirements: 10+ years C# and .NET Core Strong distributed systems and microservices background Hands-on experience with RabbitMQ, Kafka or similar messaging technologies Proficiency with TCP/IP, gRPC and high-availability protocols Performance tuning, concurrency and multithreading expertise Docker, Kubernetes and CI/CD familiarity Relevant degree If this sounds like your next challenge, apply with a copy of your CV. Permanent https://jobs.co.uk/job/principal-software-engineer-hyperloop-recruitment--695fea5a-3ecc-41cd-b228-78a071d8dc15 https://jobs.co.uk/job/principal-software-engineer-hyperloop-recruitment--695fea5a-3ecc-41cd-b228-78a071d8dc15 Thu, 25 Jun 2026 23:00:00 GMT Location: Liverpool | Salary: £75,000 | Type: Permanent | Principal Software Engineer £75,000 (DOE) + benefits Liverpool (hybrid) Hyperloop Recruitment is partnering with a leading Liverpool-based tech firm who are looking for a Principal Software Engineer to join their team. This role would suit a Principal Software Engineer seeking a challenging next step in their career; this is a mix of both hands-on work (TypeScript focused stack) and technical leadershi... Permanent