Principal Full Stack Software Engineer

Salary: £90,000 - 90,000 per year

Requirements:

• We require at least 10 years of experience at principal or staff grade equivalent.
• We require expert-level Java 17 or 21 experience, including modern language features.
• We require in-depth Spring Boot experience, including security, transaction management, and async/reactive development.
• We require microservices architecture design experience, including designing services from scratch.
• We require production experience with Kubernetes and Docker.
• We require hands-on AWS experience, including EKS, Lambda, S3, RDS, and EventBridge.
• We require experience owning CI/CD pipelines.
• We require a strong automated testing discipline, including JUnit, Mockito, integration testing, and TDD or BDD.
• We require frontend leadership experience in React, including leading React work itself.
• We require experience implementing FFE/BFE separation.
• We require architecture ownership across multiple systems.
• We require cross-team technical leadership.
• We require a track record of influencing engineering standards, technology choices, or hiring.
• We require evidence of growing other engineers.
• We require UK SC clearance eligibility and a UK national with 5 years of continuous UK residency.
• We require that applicants not need sponsorship now or in the future for UK permanent employment status.

Responsibilities:

• We will have our principal engineer own architecture across multiple services.
• We will have our principal engineer provide technical leadership across teams.
• We will have our principal engineer write code and set direction.
• We will have our principal engineer contribute directly to engineering standards.
• We will have our principal engineer contribute to hiring.
• We will have our principal engineer work on a Java/Spring Boot microservices platform on AWS EKS.
• We will have our principal engineer work with a Next.js frontend.
• We will have our principal engineer work with Camunda-based process orchestration.
• We will have our principal engineer travel to London occasionally for client work.

Technologies:

• AWS
• Lambda
• Camunda
• CI/CD
• Docker
• Frontend
• JUnit
• Java
• Kubernetes
• React
• Security
• Spring
• Spring Boot
• TDD
• microservices
• Cloud
• API
• BPMN
• Backend
• JavaScript
• Mobile
• React Native
• Terraform
• UX UI Design
• Fullstack

More:

We are a growing technology consultancy offering a hands-on principal engineering role with salary up to £80k, and potentially higher for the right candidate. The role can be based remotely, with occasional travel to London for client work and travel expenses paid, typically about once a month. We are working on a platform built with Java/Spring Boot microservices on AWS EKS, a Next.js frontend, and Camunda-based process orchestration.

last updated 39 week of 2026