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Harrington Starr has partnered with a leading Global Payments Technology company who are seeking to hire a Principal Software Engineer to join their senior engineering leadership team. Provide leadership and mentorship across multiple engineering teams.

This is a hands-on technical role where you'll shape the design, guide the team, and ensure successful delivery of a critical transformation project.Collaborate with a cross-functional team (including React developers) to ensure seamless integration of front-end and back-end.Build credibility throug

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, shaping how simulation-

Principal Software Engineer – Node / TypeScript. This is a hands-on principal-level role for a truly T-shaped engineer — someone with exceptional depth in. Join a senior, low-ego engineering team that values clarity of thought and clean execution.

Principal Software EngineerPortsmouth | Hybrid, 3 days onsite£75,000-£85,000 plus bonus and benefitsThis 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 deli

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.

As a Principal Engineer at JPMorgan Chase within the Accelerator, you are the heart of this venture, focused on getting smart ideas into the hands of our customers. Formal training or certification on React engineering concepts and proficient expert experience. Recruit, mentor and lead a lean, high�

Oliver Wyman is seeking a Principal Software Engineer (Cloud) to join our Retail Solutions team in the UK, with London or Newcastle being our preferred office locations but we can offer some flexibility. Principal SW Engineering or SW Architect roles. A strong understanding of software engineering b

You will have the opportunity to shape the direction of our projects while mentoring junior engineers and preparing for a future lead position. Strong background in software design patterns and architectural principles.

We are looking for a Principal Software Engineer who will play a defining role in shaping our platform, our teams, and our technical future. Prior CTO (at a startup), Principal Engineer, or equivalent senior technical leadership experience is a strong plus. We design and operate a software platform

Software Engineer to deploy AI systems in healthcare, focusing on patient communication, triage, and secure data layers using Python. The tech stack is primarily Python, with flexibility on other languages for experienced engineers.

Principal Engineer – Join a profitable FinTech Scale-Up. As they continue to grow, they are looking for a Principal Engineer to lead the next phase of innovation across their most critical product. Lead the re-architecture of the team’s code, collaborating with principal engineers in other teams

A leading software development firm in London is seeking a Principal Software Engineer to lead the architectural evolution of their platform. The ideal candidate has over 12 years of software engineering experience, deep expertise in distributed systems, and exceptional leadership skills.

Senior Principal Software Engineer. You will interact with architects, software and data engineers, AI/ML modelers, product owners as well as other team members across R&D. Software Engineering & Application Development.

As a Principal Software Engineer, your world is being embedded or supporting the teams where the hardest work is happening at any given time, helping them deliver good quality software with predictable velocity, helping them break through when they’re getting blocked, helping them get better over

They’re now looking for a Principal Software Engineer to provide senior technical leadership across multiple delivery engagements and to help shape how modern software is built, evolved, and maintained. We (SR2) have partnered with this highly regarded cloud and software engineering consultancy th

Salary: Circa £65k + Up to 15% Bonus Sponsorship:**Unfortunately, we are unable to offer sponsorship for this role If you're a Principal Software Engineer, who enjoys architecting complex systems, owning technical decisions, and crafting Python‑powered solutions that make a real impac

Snyk is the leader in secure AI software development, helping millions of developers develop fast and stay secure as AI transforms how software is built. At least 10 years of commercial software engineering experience, with a proven track record of leading the design and delivery of large‑scale, c

As a Principal Software Engineer, you will play a senior technical leadership role across Appvia’s software delivery engagements. We partner with customers across public and private sectors to reduce technical debt, improve engineering practices, and support long-term system evolution using modern

A leading software company is seeking a Principal Software Development Engineer to work on CAD/Geometry products. Applicants should have a Bachelor's in engineering or Computer Science, with over 8 years in software engineering, particularly in CAD or 3D applications. This role involves developing s

Senior Systems & Regulatory Software Engineer. Systems / Regulatory Software Engineer. Safety-critical, regulated medical software.

La Fosse has partnered with a leading tech client who is looking for a Principal Software Engineer with extensive experience in React, TypeScript, and Kotlin. Principle Software Engineer - £625-£650 outside IR35 - London (Hybrid 3 days in the office required).

A digital product consultancy is seeking a Principal Software Engineer to lead technology delivery and ensure high-quality outcomes for client engagements. The successful candidate will collaborate with key stakeholders to influence technology strategies, mentor engineering teams, and contribute to

A healthcare AI startup is seeking a Software Engineer to develop and deploy AI systems focused on patient communication and triage.

A leading tech solutions provider in Greater London seeks a Principal Engineer to guide projects that leverage AI/ML, deliver high-quality software, and build strong client relationships.

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 bring deep hands-on experience in software engineering, particularly modernisation, with a track reco

A leading technology consulting firm in London is seeking a Principal Software Engineer to drive technical direction and client engagement. This role requires extensive experience in software development, particularly with AI and ML technologies.

Elasticsearch - Principal Software Engineer I (Distributed Systems). Principal Software Engineer I - Distributed Systems. We are looking for a senior engineer to join our Elasticsearch - Distributed Systems team and focus on scale, performance, and resilience.

Principal Tech Recruiter (Software Engineering) at Wave Talent. Software Engineer/Quant Developer (FULLY REMOTE) - Up to £200k + Bonus - London. Get notified about new Software Engineer jobs in.

A leading cloud consultancy in the UK is looking for a Principal Software Engineer to lead the design and delivery of modern scalable software systems. You will mentor engineers and act as a senior technical advisor, guiding customers through complex architectural decisions.

As the Principal Engineer, Software Supply Chain Security, you’ll own the technical strategy that secures how software is built and delivered on GitLab’s DevSecOps platform. Experience operating as a Principal or Staff Engineer across multiple development teams, providing architectural leadershi

A transformative Medical Device company in the UK is seeking a Principal Software Engineer. You will lead software testing and quality assurance activities, create effective testing strategies, and manage cybersecurity efforts. The ideal candidate has hands-on software testing experience and a relev

Principal Embedded Software Engineer - Southampton - £70k - £80k. Hexwired Recruitment has partnered with a world renowned Electronics manufacturer based in Southampton who are now seeking a Principal Embedded Software Engineer to help develop and maintain a brand new system the company is develop

A leading global financial services firm seeks an experienced Principal Software Engineer specializing in Java development for algorithmic trading.

As a Lead / Principal Software Engineer, you will:. Champion engineering excellence by influencing the adoption and continuous improvement of engineering standards and best practices across the firm. Establish and mentor permanent engineering teams within agencies, transferring technical expertise a

Principal Software Engineer (London Only). Our pay ranges for our Principal Engineer position within London is: £92-818-£116-122 GBP. Data Engineering: including platforms like Databricks for data processing and analytics.

A leading retail company is currently seeking a Principal Software Engineer to join their dynamic team in London. This role involves leading high-performing engineering teams, enhancing engineering excellence, and influencing technology strategy. The ideal candidate will have a deep expertise in sof

A leading retail company in the United Kingdom seeks a Principal Software Engineer to lead high-performing teams and drive engineering excellence. You will shape and inspire the software engineering culture while working with modern technologies like React, Java, and Azure.

Technical Lead - Principal Software Engineer. Degree in computer science or software engineering, with at least 8 years of relevant work experience, including experience in technical leadership and people management. We are looking for a highly motivated individual to become a Software Engineering T

Platform - Principal Software Engineer (Billing Team). Proven record of mentoring engineers, setting technical direction, and elevating engineering quality standards. Elasticsearch develops and distributes encryption software and technology that is subject to U.

A leading global technology provider is looking for a Software Engineer in London to drive technical excellence and mentor engineering talent. Join a team committed to shaping a best-in-class engineering culture and making a meaningful impact in technology.

A leading fintech scale-up in the UK is seeking a Principal Software Engineer to drive the development of a new credit card product.

A leading cloud and software engineering consultancy in Greater London seeks a Principal Software Engineer to provide senior technical leadership. You'll design and evolve scalable software systems, mentor engineers, and influence architectural standards.

A leading insurtech company in Greater London is seeking a Principal Engineer to shape the technology direction and drive modernization initiatives. You'll lead by example in designing and delivering resilient, high-quality systems, and mentor junior engineers.

As part of the M&S Software Engineering team, you’ll be joining a well-loved historic brand, working on solutions that serves millions of loyal customers and thousands of colleagues! With ethical values that run right through the company’s core and technology leaders that truly understand softwa

A global management consulting firm is seeking a Principal Software Engineer (Cloud) to join their Retail Solutions team in the UK. The ideal candidate will have strong cloud engineering skills and experience in software development, especially in JavaScript and Python.

As a Principal Systems Engineer, you’ll lead a team of talented, collaborative engineers working across Cloudflare’s ecosystem. Principal Systems Engineer - Billing. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a li

Join to apply for the Principal Software Engineer, Snyk Code (SAST) role at Snyk. As a Principal Software Engineer on the Snyk Code team, you will be responsible for driving our technical future and tackling our most difficult and strategic challenges in static analysis. Principal Software Engineer,