Principal Software Engineer
3 weeks ago
Principal Full Stack Engineer – React, Typescript, C#, .NET Core, MySQL, AWS Services (serverless) Outstanding permanent opportunity to join this global, market leading, B2B SaaS tech business as a Principal Engineer (Full Stack) / Lead Full Stack Developer with deep expertise in React, Typescript, C#, .Net Core, MySQL, AWS Serverless Services and event driven architecture. This business is embracing AI and bleeding edge development practices and offers the opportunity to help them to evolve and automate their Platform as a Service (PaaS) environment. What You’ll Be Doing: Own architecture and technical decisions across squads; accountable for how software is built and shipped. Design and develop distributed, scalable microservices (C# .NET Core or Node.js) and REST/JSON APIs. Build modern React + TypeScript UIs with component-driven design, advanced state management, and reusable frameworks. Leverage AWS services (Lambda, API Gateway, SQS/SNS, Step Functions, S3, IAM) to deliver secure, event-driven systems. Embed testing-first practices (TDD/BDD, contract tests, Jest/RTL, Playwright/Cypress, xUnit/NUnit) to raise code quality. Implement modern CI/CD (GitHub Actions) and Infrastructure as Code (Terraform, CloudFormation, AWS CDK). Model secure-by-design principles; ensure robust authentication/authorisation (OAuth2, JWT) and data governance. Mentor engineers, set patterns, run PoCs, and unblock complex problems across squads. Champion “Always ship each cycle”; partner with Product to balance scope, delivery, and quality. Drive modernisation: sunset legacy code, reduce tech debt, and improve performance, reliability, and observability. Who We’re Looking For: Highly experienced full stack engineer with strong proficiency in C# .NET Core and/or Node.js , plus React + TypeScript expertise. Proven experience designing event-driven, microservices architectures on AWS with secure, scalable patterns. Deep knowledge of API design, integration, and auth (OAuth2, JWT), with end-to-end performance focus. Strong database fundamentals with MySQL/Aurora: schema design, query optimisation, and performance engineering. Hands-on leader: comfortable coding ~40%+ of the time while guiding architecture across squads. Fluent with testing strategies across the stack and quality gates (coverage thresholds, PR checks, static analysis). Experienced with CI/CD and IaC (GitHub Actions, Terraform, CloudFormation, AWS CDK) and Git workflows. Security-minded with experience using tools like Sonat/Snyk/AppCheck for CVE remediation. Excellent collaborator and communicator with Product, QA, Security, DevOps, and Design stakeholders. Pragmatic, outcome-oriented, and energised by mentoring others and solving hard engineering problems. £Market rate + bonus + benefits. London & 95% remote
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Principal Software Engineer
2 weeks ago
London, United Kingdom Software Development & Engineering Full time🔥 Principal Software Engineer - Lead the Future of UK GovTech Innovation💰 Up to £100,000 + Premium Benefits Package 🏡 Remote-First | Just 1 Day Onsite Every 2 Weeks 🔐 SC Clearable | British Citizens Only 🚀 Where Technology Meets Purpose Are you ready to lead engineering efforts that directly impact national security, public services, and...
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Principal Software Engineer
2 weeks ago
London, United Kingdom Harnham Full time**Principal Python Engineer (start up)** **Up to £130,000 + equity + pension** **LONDON - HYBRID / MOSTLY REMOTE** **TECH STACK: Python, Kubernetes, Docker, Microservices, GCP** An extremely successful machine learning based start-up is hiring a Principal python engineer to join their expanding London-based team. They are seeking a motivated and...
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Principal Software Engineer
2 weeks ago
London, United Kingdom Manpower Full timePrincipal Software Engineer Great Baddow(Chelmsford)-Hybrid working role Up to £80k + 10-20% Bonus My client a multinational Aerospace & Defence organisation are looking for a Principal Software Engineer to join their Great Baddow site working on a hybrid basis. What you'll be doing: Derive and maintain a set of software requirements from a baseline set of...
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Principal Software Engineer
2 weeks ago
London, United Kingdom Bright Purple Resourcing Full timePrincipal Software EngineerEdinburgh 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. This is a unique opportunity to play a key role in the development of next-generation patient monitoring and connectivity solutions that make a real...
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Principal Software Engineer
2 weeks ago
City Of London, United Kingdom Bright Purple Resourcing Full timePrincipal 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. This is a unique opportunity to play a key role in the development of next-generation patient monitoring and connectivity solutions that make a real...
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Principal Software Engineer
3 days ago
London, United Kingdom TPXImpact Holdings Plc Full timeJob DescriptionJob DescriptionYou can get further details about the nature of this opening, and what is expected from applicants, by reading the below.About The RoleDeadline for applications: 11:59pm on 31st October 2025Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern,...
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Principal Software Engineer
1 week ago
East London, United Kingdom TPXImpact Holdings Plc Full timeAbout The Role Deadline for applications: 11:59pm on 31st October 2025 Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. We use technology to create impactful, human-centred solutions that make a difference to users and organisations. We believe great...
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Principal Software Engineer
1 week ago
East London, United Kingdom TPXImpact Holdings Plc Full timeAbout The Role Deadline for applications: 11:59pm on 31st October 2025 Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. We use technology to create impactful, human-centred solutions that make a difference to users and organisations. We believe great...
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Principal Software Engineer
2 weeks ago
Greater London, United Kingdom Free-Work UK Full timePrincipal Software Engineer – Free-Work UK Join to apply for the Principal Software Engineer role at Free-Work UK. Base pay range Job Title: Principal Software Engineer Location: Great Baddow – We offer flexible working arrangements, part time & accruing hours available. Please let us know if you would like to discuss these options. Salary: Up to...
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Principal Software Engineer
1 week ago
London Area, United Kingdom Fynity Full timePrincipal Software Engineer (Java) London – 1 day a week onsite
