Principal Software Engineer jobs in United Kingdom

Job Description Principal Software Engineer Portsmouth | Hybrid, 3 days onsite £75,000-£85,000 plus bonus and benefits This Principal Software Engineer role is designed for a hands-on technical leader with strong C++ and Unreal Engine expertise, working at the forefront of complex, performance-critical software delivery. The role combines advanced engineering with genuine technical authority,...

Job Description Principal Software Engineer Location: Edinburgh, United Kingdom Contract Duration: 12 months Rate: £63.83 p/h PAYE (£73.11 inc. holiday rate) OR £87.04 p/h Umbrella We seek an engineer with recent high-integrity or safety-critical industry experience (defence, aerospace, or similar), or eligible for UK security...

About The Role Deadline for applications: 11:59pm on 31st October 2025 Applying for this role is straight forward Scroll down and click on Apply to be considered for this position. Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. xujxxms We use technology to create impactful,...

Job Description Principal Software Engineer Basildon 3-Month Contract Paying up to £70p/h (Inside IR35) Please note - due to the nature of the work, you will need to hold or be eligible to obtain a high level of UK Security clearance - please only apply if suitable Key Responsibilities: - C++ software development - Development of new applications to meet user expectations and within formal...

Principal Software Engineer Edinburgh An innovative and well-established med tech company are seeking a proven technical leader to join its R&D team basedin central Edinburgh as a Principal Software Engineer. Submit your CV and any additional required information after you have read this description by clicking on the application button. This is a unique opportunity to play a key role in the...

Job Description Principal Software Engineer Salary: Negotiableplus benefits, pension (7% contribution), 25 days holiday & 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...

You will not be a people manager, but a hands-on-keyboard leader and a force multiplier for the team. Your primary responsibility will entail diving deep into our codebase, untangling its intricacies, and crafting a new future by harnessing innovative AI and automation.

You will operate with significant autonomy, influencing the technical strategy for our key products and mentoring senior engineers.

You will work closely with Senior, Staff and Principal Engineers across Belfast and the wider global engineering organisation, contributing to large scale distributed systems while acting as a technical authority within the team. This role offers a strong mix of hands-on development, architectural decision making and mentorship.

A technology company is seeking a Principal Software Engineer II specializing in the storage engine for Elasticsearch. This fully remote position involves leading initiatives for Timeseries solutions and improving Elasticsearch features. A strong background in Java, along with experience in data storage technologies and excellent communication skills, is essential for this collaborative role. The...

A leading crypto platform in London seeks a Principal Software Engineer to define technical direction and tackle complex architectural challenges. The ideal candidate has 8-10 years of software development experience, primarily in Python. Responsibilities include influencing software architecture, maintaining operational excellence, and driving technical initiatives. The role offers competitive...

You will be designing solutions for complex challenges that will meet and exceed user requirements. Responsibilities will include: - Take responsibility for the leadership and delivery of whole, or significant sub-components, of technical consulting projects and products.

You will work closely with subject matter experts and senior stakeholders on high-impact programmes spanning modelling and simulation, autonomy, geospatial systems, synthetic environments and digital twins.

You will remain deeply technical while setting direction, leading teams and acting as the technical authority across projects.

About The Role Deadline for applications: 11:59pm on 31st October 2025 Applying for this role is straight forward Scroll down and click on Apply to be considered for this position. Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. xujxxms We use technology to create impactful,...

Principal Software Engineer Location: Edinburgh, United Kingdom Contract Duration: 12 months Rate: £63.83 p/h PAYE (£73.11 inc. holiday rate) OR £87.04 p/h Umbrella We seek an engineer with recent high-integrity or safety-critical industry experience (defence, aerospace, or similar), or eligible for UK security clearance. Role Overview An experienced Principal Software Engineer is required to...

You will not be a people manager, but a hands-on-keyboard leader and a force multiplier for the team. Your primary responsibility will entail diving deep into our codebase, untangling its intricacies, and crafting a new future by harnessing innovative AI and automation.

You will operate with significant autonomy, influencing the technical strategy for our key products and mentoring senior engineers.

Principal Software Engineer – Manchester – eCommerce - 90k+10% Bonus All the relevant skills, qualifications and experience that a successful applicant will need are listed in the following description. Great opportunity for a Principal Software Engineer to join a Manchester based eCommerce giant as they work on a large-scale digital re-platform across the estate to MACH and Event-Driven...

About The Role Deadline for applications: 11:59pm on 31st October 2025 Applying for this role is straight forward Scroll down and click on Apply to be considered for this position. Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. xujxxms We use technology to create impactful,...

Principal Software Engineer Location: Edinburgh, United Kingdom Contract Duration: 12 months Rate: £63.83 p/h PAYE (£73.11 inc. holiday rate) OR £87.04 p/h Umbrella We seek an engineer with recent high-integrity or safety-critical industry experience (defence, aerospace, or similar), or eligible for UK security clearance. Role Overview An experienced Principal Software Engineer is required to...

About The Role Deadline for applications: 11:59pm on 31st October 2025 Applying for this role is straight forward Scroll down and click on Apply to be considered for this position. Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. xujxxms We use technology to create impactful,...

About The Role Deadline for applications: 11:59pm on 31st October 2025 Applying for this role is straight forward Scroll down and click on Apply to be considered for this position. Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. xujxxms We use technology to create impactful,...