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# Principal Full Stack Software Engineer

- **Company:** Leadershiptrack
- **Location:** Southampton, UK (Remote available)
- **Experience:** Expert
- **Salary:** £80,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, Amazon S3, Business Process Model and Notation, Continuous Integration, Data Normalization, Junit, Mockito, Next.js, Network Routers, Test-Driven Development (TDD), Docker for Aws, ReactJS, Spring-boot, SC Clearance, Material UI, Integration Tests, Kubernetes, Front End Software Development, Software Coding, Terraform, AWS EKS, Docker, Microservices
- **Published:** September 24, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/principal-full-stack-software-engineer/48023249

## About the Role

orchestration.EssentialExperience level: 10+ years minimum, principal or staff grade equivalent.Backend and cloud:Java 17 or 21, at expert level - modern language featuresSpring Boot in depth: security, transaction management, async/reactiveMicroservices architecture design - has designed services from scratchKubernetes and Docker in production (not local development use)AWS, hands-on: EKS, Lambda, S3, RDS, EventBridgeCI/CD pipeline ownershipAutomated testing discipline: JUnit, Mockito, integration testing, TDD or BDDFrontend:Held a lead or tech lead role on frontend development in React. Leadership must have been over React work itself.Understands and has implemented FFE/BFE separation - the split between the presentation layer (components, styling, client state) and the frontend's own server-side tier (data aggregation for the UI, session and auth handling, server-side rendering, API route composition).Leadership:Architecture ownership across multiple systemsCross-team technical
leadershipTrack record of influencing engineering standards, technology choices, or hiringEvidence of growing other engineersSecurity clearance: UK SC clearance required. Active clearance strongly preferred; eligible candidates considered - must be a UK national with 5+ years continuous UK residency.Desirable:Camunda 8 / BPMN process orchestrationNext.js specifically (App Router, server components, route handlers)Terraform or other infrastructure-as-code, to module-authoring levelReact Native or equivalent building native mobile from a React codebaseDesign system or component library ownershipConsultancy or client-facing delivery backgroundOpen-source contributions, conference talks, or published technical writingPolyglot beyond JavaOther StuffNB: for non-UK Citizens; we cannot accept applications from anyone requiring sponsorship (now or in the future) for UK permanent employment you are utilising a work visa this must allow you to work in the UK unrestricted
for at least the next 5 years.Profile 29 recruitment keywords: Java Spring Boot Microservices Kubernetes Docker AWS EKS Lambda S3 RDS EventBridge CI/CD Junit Mockito integration testing TDD BDD React Camunda BPMN Next.js Terraform lead senior manage manager director remote London hybrid developer engineerJBRP1_UKTJ

## Description

Job DescriptionPrincipal Software Engineer Salary to £80k, poss higher for their Unicorn candidate Role can be based remotely, as long as you can occasionally travel to London for client work (travel expenses paid)- approx. once a month.NB: Please only apply if you are a UK National & UK passport holder, have resided in the UK for the past 5 years and are prepared to go through UK SC Security Clearance. Proof of ID will be required prior to interview. This role is with a growing is a technology consultancy. This is a hands-on principal engineering role: architecture ownership across multiple services, technical leadership across teams, and direct contribution to engineering standards and hiring. Their successful candidate will be writing code as well as setting direction - this is not a purely architectural or management position. Current delivery is a Java/Spring Boot microservices platform on AWS EKS, with a Next.js frontend and Camunda-based process


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