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Principal Software Engineer

Haystack
Department:Fullstack React
Type:REMOTE
Region:UK
Location:London, England, United Kingdom
Experience:Mid-Senior Level
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Job Description

Posted on: September 6, 2026

A technology consultancy is seeking a highly skilled and experienced Principal Software Engineer. This company is at the forefront of digital transformation, delivering innovative solutions to complex technical challenges for a diverse client base.

The Role

  • Drive architecture ownership across multiple services and provide technical leadership across teams.
  • Directly contribute to engineering standards and best practices, as well as talent acquisition.
  • Write high-quality code, balancing hands-on development with strategic direction.
  • Collaborate on a Java/Spring Boot microservices platform on AWS EKS with a Next.js frontend and Camunda orchestration.
  • Occasional travel to London for client work (approx. once a month) with expenses paid.
  • UK SC Security Clearance required; must be a UK National who has resided in the UK for the past 5 years.

What You'll Need

  • Minimum 10+ years of experience at a principal or staff-grade equivalent level.
  • Expert-level proficiency in Java 17 or 21, leveraging modern language features.
  • In-depth knowledge of Spring Boot, including security, transaction management, and asynchronous/reactive programming.
  • Proven experience designing microservices architectures from the ground up.
  • Hands-on experience with Kubernetes and Docker in production environments.
  • Practical expertise in AWS services such as EKS, Lambda, S3, RDS, and EventBridge.
  • Experience owning CI/CD pipelines and a strong discipline in automated testing (JUnit, Mockito, integration testing, TDD/BDD).
  • Lead or tech lead experience in React frontend development, understanding FFE/BFE separation.

What's On Offer

  • Competitive salary, potentially higher for exceptional candidates.
  • Opportunity to shape engineering direction and mentor other engineers.
  • Work with cutting-edge technologies in a dynamic consultancy environment.
  • Flexible remote work arrangement with compensated travel for client engagements.

Apply via Haystack today!

Originally posted on LinkedIn

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