1 to 25 of 27 Principal Software Engineer Jobs in the UK

Principal/Senior Principal Software Engineer page is loaded Principal/Senior Principal Software Engineerlocations: Welwyntime type: Tempo integralposted on: Publicado hojetime left to apply: Data de término: 30 de setembro de 2025 (13 dias restantes para se candidatar)job requisition id: 16At Roche you can show up as yourself, embraced for the … and adoption. Our team specializes in building Data Pipelines and Applications for data acquisition, collection, storage, transformation, linkage and sharing. Join our Data and Digital Catalyst team as a Software Engineer, where you will develop the modernized and interconnected computational and data ecosystems that are foundational to our research. You'll build robust and scalable systems that unlock … opportunities to build common, reusable solutions. Mentor junior developers, fostering their professional growth and upholding high engineering standards. Who You Are We are looking for a passionate and collaborative software engineer with a talent for building scalable, reliable platforms. You thrive on engaging with scientific partners to solve complex challenges and are dedicated to engineering best practices.You bring More ❯

Principal Software Engineer - Lead Innovation in Government Tech Up to £95,000 + Exceptional Benefits Remote First (1 Day/Fortnight Onsite) SC Clearable - British Citizens Only Are you ready to shape the future of government technology? Join a cutting-edge software engineering business as a Principal Software Engineer, where you'll lead More ❯

Principal Software Engineer (Permanent) Salary: £65,000 - £75,000 Location: UK-based iO Associates is supporting a large public-sector organisation. They are looking for a Principal Software Engineer to help shape the future of digital services. You'll join a forward-thinking Head of Engineering who is transforming the team to deliver smarter … more efficient solutions for residents and staff. What you'll be doing Setting the technical direction of software engineering and helping to define best practice. Taking a hands-on role in solution design and development. Collaborating closely with platform engineering to create robust, scalable services. Building new tools internally to improve access to services, automate processes, and enhance systems … in housing and property services. What we're looking for Strong software engineering expertise, ideally with JavaScript (React preferred) and knowledge of cloud platforms (AWS, Azure, Cloudflare). Experience in solution design and delivering end-to-end digital services. Background in consultancy Knowledge of containerisation tools (Docker or Kubernetes) is a plus. A proactive, "get things done" mindset with More ❯

Principal Software Engineer (Java/Python) London (Office Based) £100,000 - £115,000 + Progression + Training An excellent opportunity awaits an experienced software engineer with strong Java and Python skills for a hands-on technical leadership position within an innovative ML-driven SaaS firm, in a role offering technical growth, variety and strong development … technical guidance and mentorship to more junior members of the development team. This role is office-based, five days per week, in Central London.The ideal candidate is an experienced engineer with strong Java and Python expertise, looking for a hands-on leadership position. Someone with strong architecture and AWS DevOps skills, along with solid hands-on experience in data … design, and third-party service integration*Mentor and guide the development team while working closely with management*Fully office-based role in Central London The Person: *Experienced hands-on software engineer with strong Java and Python skills*Strong AWS cloud infrastructure and containerisation experience*Skilled in building and managing data ingestion and processing pipelines*Living within a commutable More ❯

Principal Software Engineer (Java/Python) London (Office Based) £100,000 - £115,000 + Progression + Training An excellent opportunity awaits an experienced software engineer with strong Java and Python skills for a hands-on technical leadership position within an innovative ML-driven SaaS firm, in a role offering technical growth, variety and strong development … guidance and mentorship to more junior members of the development team. This role is office-based, five days per week, in Central London. The ideal candidate is an experienced engineer with strong Java and Python expertise, looking for a hands-on leadership position. Someone with strong architecture and AWS DevOps skills, along with solid hands-on experience in data … design, and third-party service integration *Mentor and guide the development team while working closely with management *Fully office-based role in Central London The Person: *Experienced hands-on software engineer with strong Java and Python skills *Strong AWS cloud infrastructure and containerisation experience *Skilled in building and managing data ingestion and processing pipelines *Living within a commutable More ❯

Principal Software Engineer - Lead the Future of UK GovTech ?? Up to £95,000 + Elite Benefits ?? Remote First (Just 1 Day Onsite Every Fortnight) ?? SC Clearable - British Citizens Only Ready to lead innovation that matters? Join a mission-driven tech powerhouse where your code helps protect national interests, drive digital transformation, and shape the future of government … technology. We're looking for a Principal Software Engineer to architect cloud-native solutions, mentor brilliant engineers, and lead delivery across high-impact government programmes. This is your chance to combine deep technical expertise with strategic leadership in a collaborative, forward-thinking environment. You will need experience in Java, React.js and AWS to be successful in this More ❯

Principal Software Engineer - Lead the Future of UK GovTech Up to £95,000 + Elite Benefits Remote First (Just 1 Day Onsite Every Fortnight)?? SC Clearable - British Citizens Only Ready to lead innovation that matters? Join a mission-driven tech powerhouse where your code helps protect national interests, drive digital transformation, and shape the future of government … technology. We're looking for a Principal Software Engineer to architect cloud-native solutions, mentor brilliant engineers, and lead delivery across high-impact government programmes. This is your chance to combine deep technical expertise with strategic leadership in a collaborative, forward-thinking environment. You will need experience in Java, React.js and AWS to be successful in this More ❯

Our client, a mission-led consultancy , is looking for an experienced Principal Software Engineer (Python or Java) to join their growing team. They deliver secure, modern software solutions to the UK Government and Defence sectors, enabling clients to build scalable systems and progressive web applications that drive real impact. This is a senior-level opportunity for … a hands-on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native … mentor engineers, promoting best practice, clean coding, and agile delivery Collaborate with stakeholders and clients to shape technical direction and ensure robust, user-focused solutions Contribute across the full software development lifecycle , from discovery to production support Essential Skills & Experience Deep expertise in Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at More ❯

Our client, a mission-led consultancy , is looking for an experienced Principal Software Engineer (Python or Java) to join their growing team. They deliver secure, modern software solutions to the UK Government and Defence sectors, enabling clients to build scalable systems and progressive web applications that drive real impact. This is a senior-level opportunity for … a hands-on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native … mentor engineers, promoting best practice, clean coding, and agile delivery Collaborate with stakeholders and clients to shape technical direction and ensure robust, user-focused solutions Contribute across the full software development lifecycle , from discovery to production support Essential Skills & Experience Deep expertise in Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at More ❯

Principal Software Engineer Security Cleared (High Level of UK Government Security Clearance Required) Salary: up to £100k + Benefits Copello Global is supporting a confidential client within the defence/technology sector in their search for an experienced Software Engineer to join them in Cheltenham. This is an exciting opportunity to work with a global … leader on highly impactful mission-critical programmes. The Role Design, build, and maintain secure, scalable software Write, review code, and support CI/CD pipelines Break down complex features and manage them within Agile workflows Deliver technical demos to internal and external stakeholders Skills Required Proficiency in Java, Python, or JavaScript Experience with AWS or Azure Familiarity with Jenkins More ❯

Principal Software Engineer Security Cleared (High Level of UK Government Security Clearance Required) Salary: up to £100k + Benefits Copello Global is supporting a confidential client within the defence/technology sector in their search for an experienced Software Engineer to join them in Cheltenham click apply for full job details More ❯

Job Title: Lead/Principal Embedded Software Engineer Location: Gloucester (On-Site Working) Salary: Up to £80,000 (Depending on Experience) Summary of Vacancy: We're currently recruiting for a Principal Embedded Software Engineer on behalf of a cutting-edge Security Research & Development organisation. This organisation is focused on low-level, security-related development … embedded systems, and is building novel and secure solutions that push technical boundaries. You'll be working in a deeply technical, collaborative environment that prioritises engineering excellence. As a Principal Engineer, you'll lead development efforts for secure embedded systems, working hands-on with code while also guiding and mentoring others. You'll collaborate with researchers to prototype … new capabilities and deliver high-integrity software across a wide range of platforms. Key Responsibilities: Develop robust, efficient embedded software with a focus on security and performance. Work across the full stack—from low-level hardware interaction up to application logic—depending on project needs. Use your deep understanding of systems to write clean, reliable code that meets More ❯

Select how often (in days) to receive an alert: Oxford Nanoscience is currently seeking an experienced Principal Software Engineer . This is a key role that combines innovation with responsibility, as you contribute to both new development projects and the ongoing evolution of our existing product range. You'll be working on highly complex, high-value scientific … systems that power breakthroughs in physics, materials science, and beyond. The Opportunity In this role, you will be responsible for the full software development lifecycle-from concept through to testing and support. You'll work closely with engineers and scientists across disciplines to deliver robust, maintainable, and high-performance software for our precision instruments. Key Responsibilities: Design, develop … and maintain software applications and device drivers for scientific instruments. Produce clean, maintainable, and well-documented code (primarily in C++, Python). Collaborate with multidisciplinary teams to understand system requirements and translate them into software design specifications. Take ownership of software components, identifying risks and ensuring robust delivery to meet internal and customer requirements. Create and execute More ❯

Principal Software Engineer Southampton 6-month contract Paying up to 65p/h (inside IR35) Please note that due to the nature of the work, you will need to be eligible to obtain a high level of UK security clearance. Please only apply if suitable. Responsibilities : Creation and development of a new generation of features and capabilities … using innovative software solutions Provide software support to the Integrated Sensors & Protection line of business. Tasked with C# application development Familiarity with the tools and approaches to embedded development Bare metal embedded C++ software development Experience required: Familiarity with Configuration Management process and tools e.g., Git Familiar with Embedded interfaces, e.g., CAN bus, I2C, SPI, GPIO Software More ❯

Principal Software Engineer Southampton 6-month contract Paying up to £65p/h (inside IR35) Please note that due to the nature of the work, you will need to be eligible to obtain a high level of UK security clearance. Please only apply if suitable. Responsibilities : Creation and development of a new generation of features and capabilities … using innovative software solutions Provide software support to the Integrated Sensors & Protection line of business. Tasked with C# application development Familiarity with the tools and approaches to embedded development Bare metal embedded C++ software development Experience required: Familiarity with Configuration Management process and tools e.g., Git Familiar with Embedded interfaces, e.g., CAN bus, I2C, SPI, GPIO Software More ❯

We are looking for a Principal Software Engineer (we call them Principal Software Craftspeople) who shares the same values of pragmatism, professionalism and transparency as us to join our team. You'd be utilising your expertise with clients, helping to shape Codurance, and being involved in coaching and mentoring across the company. We support our … within our client's existing team to help them tackle complex challenges within their own software. Or maybe you're more interested in helping to introduce the values of software craftsmanship and extreme programming practices to an organisation through coaching & mentoring. Location: We are open to this role being hybrid, with occasional travel to client sites. Please note that … identify and solve problems. You are good at helping people come up with a vision and helping them get aligned behind it You bring deep hands-on experience in software engineering, particularly modernisation, with a track record of guiding teams to build well-crafted, reliable, and maintainable systems. You're comfortable leading complex client engagements - shaping delivery through discovery More ❯

We don't just build technology. We build hope. We are seeking a highly experienced Principal Software Engineer to lead the development of advanced control systems software for our state-of-the-art radiotherapy solutions.This role involves designing and evolving a suite of applications, including service tools, factory test software, and interfaces that connect treatment … and maintenance of these applications to a modern, containerised microservices platform.As a technical leader within a Scrum team and an Agile Release Train, you will champion best practices in software engineering, ensuring quality and compliance in a safety-critical environment. Your expertise will guide architectural decisions, influence technical strategy, and mentor teams to deliver innovative, reliable solutions that make … patient care. What you'll do at Elekta: Define, design, develop and maintain applications and the control system for the Elekta Radiotherapy Treatment System (Linac). Maintaining and enhancing Software quality metrics including test coverage and code maintainability through code walkthroughs, testing at all level of the V model and attention to detail. Ensuring the code and the system More ❯

Principal Software Engineer - Front End Architect and Governance Lead Why you should apply for a job to JPMorgan Chase: 61% say women are treated fairly and equally to men 77% say the CEO supports gender diversity Ratings are based on anonymous reviews by Fairygodboss members. Position summary ll guide the development of innovative UI components and frameworks More ❯

Embedded C++ Software Engineer (Senior/Principal) We are on the hunt for talented software engineers to support our Integrated Sensors & Protection line of business. Direct industry experience is not required, we are happy to explore all backgrounds. We want to develop a new generation of features and capabilities using innovative software solutions and we … need you to create them. What we are looking for: Essential • Bare metal embedded C++ software development • Embedded interfaces e.g. CAN bus, I2C, SPI, GPIO • Familiarity with the tools and approaches to embedded development Useful to have • C# application development • Developing Windows & Linux applications • Familiarity with the Software lifecycle processes • Familiarity with Configuration Management process and tools e.g. … git • Software design e.g. SysML/UML • Test case/procedure development • Iterative development lifecycles (for example tailored Agile.) • Tools associated with Iterative development lifecycles (Jira/DevOps.) • Docker, Virtual machines and Continuous Integration (CI) tools e.g. Jenkins More ❯

Embedded C++ Software Engineer (Senior/Principal) We are on the hunt for talented software engineers to support our Integrated Sensors & Protection line of business. Direct industry experience is not required, we are happy to explore all backgrounds. We want to develop a new generation of features and capabilities using innovative software solutions and we More ❯

Job Title : Principal Embedded Software Engineer Location : Bristol City Centre - 3 Days Per Week On-Site Salary - Up to £72,000 + Bonus & Benefits (Depending on Experience) Summary: This is a fantastic opportunity for an experienced engineer with a passion for leadership and a background in safety-critical embedded software to step into a high … impact role, driving both technical delivery and team performance. Responsibilities : Leading, mentoring, and managing a team of embedded software engineers in a collaborative and high-performing environment. Overseeing the full software development lifecycle from requirements and design through to implementation, testing, and maintenance. Collaborating with cross-functional teams, including project management and QA, to ensure seamless and timely … and resolving technical challenges while managing risk and maintaining timelines. Driving continuous improvement, fostering innovation, and supporting professional growth within your team. Required Skills & Experience: Proven experience in embedded software development within a safety-critical environment. Solid understanding of embedded systems and RTOS Strong programming skills in C and assembler. Demonstrated leadership experience with the ability to mentor, motivate More ❯

Job Title : Principal Embedded Software Engineer Location : Bristol City Centre - 3 Days Per Week On-Site Salary - Up to £72,000 + Bonus & Benefits (Depending on Experience) Summary: This is a fantastic opportunity for an experienced engineer with a passion for leadership and a background in safety-critical embedded software to step into a high … impact role, driving both technical delivery and team performance. Responsibilities : Leading, mentoring, and managing a team of embedded software engineers in a collaborative and high-performing environment. Overseeing the full software development lifecycle – from requirements and design through to implementation, testing, and maintenance. Collaborating with cross-functional teams, including project management and QA, to ensure seamless and timely … and resolving technical challenges while managing risk and maintaining timelines. Driving continuous improvement, fostering innovation, and supporting professional growth within your team. Required Skills & Experience: Proven experience in embedded software development within a safety-critical environment. Solid understanding of embedded systems and RTOS Strong programming skills in C and assembler. Demonstrated leadership experience with the ability to mentor, motivate More ❯

Job Title : Principal Embedded Software Engineer Location : Bristol City Centre - 3 Days Per Week On-Site Salary - Up to £72,000 + Bonus & Benefits (Depending on Experience) Summary: This is a fantastic opportunity for an experienced engineer with a passion for leadership and a background in safety-critical embedded software to step into a high … impact role, driving both technical delivery and team performance. Responsibilities : Leading, mentoring, and managing a team of embedded software engineers in a collaborative and high-performing environment. Overseeing the full software development lifecycle – from requirements and design through to implementation, testing, and maintenance. Collaborating with cross-functional teams, including project management and QA, to ensure seamless and timely … and resolving technical challenges while managing risk and maintaining timelines. Driving continuous improvement, fostering innovation, and supporting professional growth within your team. Required Skills & Experience: Proven experience in embedded software development within a safety-critical environment. Solid understanding of embedded systems and RTOS Strong programming skills in C and assembler. Demonstrated leadership experience with the ability to mentor, motivate More ❯

transaction services, to make mobility ecological, efficient and convenient. Are you adaptable, flexible and pragmatic with a DevOps mindset? Are you able to apply good engineering processes to deliver software products of high quality and performance, even with occasionally ambiguous requirements? The ideal candidate will be a lifelong learner who enjoys solving technical problems, is curious about new technologies … pre-release and production environments running on AWS. We operate a DevOps culture and are responsible for developing, deploying, operating and monitoring our team's deliverables. As the senior engineer in the team, you will set the technical standard for the team; offering mentoring and support to your team-mates. Requirements A desire and willingness to learn other languages … direction to your team and contributing to the wider engineering organisation. Deep technical understanding of MySQL and relational databases, particularly database performance tuning. Knowledge of best practises around Modern Software Engineering, CI/CD, DORA metrics. Experience of software architecture and presenting technical designs to your team and stakeholders. Demonstrable expertise and understanding of API development/design More ❯

Vicinity Technologies Limited, a dynamic leader in the UK's 5G and AI revolution, is seeking talented Senior/Principal Wireless Software Engineers to join our team of innovators. As a key contributor, you will play an integral role in developing cutting-edge 5G, 6G and Non-terrestrial Network (NTN) solutions which are transforming the way we connect … and communicate. Job Responsibilities Participate in design and develop 5G/6G TN/NTN and AI signal processing algorithms for communications systems, physical layer software and protocol stack software. Participate in 5G radio equipment and user terminals physical layer solution verification, end-to-end testing, network deployment and field trials. Interface with hardware, software and system engineers … growing company. Benefit from a competitive salary, performance-based bonuses, and a comprehensive benefits package. About Vicinity Founded in 2023, Vicinity develops and deploys advanced base stations, NTN solutions, software-defined terminal solutions and private networks, with global trials already underway. We collaborate with silicon providers, operators, integrators and top research institutes, pushing past 5G into what is next. More ❯