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# Principal Backend Engineer Java Spring Boot AWS

- **Company:** Client Server
- **Location:** London, UK (Remote available)
- **Salary:** £100,000.0 - £120,000.0
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Amazon Web Services, Continuous Integration, Data Structures, Software Design Patterns, DevOps, Distributed Systems, Object-Oriented Software Development, Software Engineering, Multithreading, Java Application Server, Concurrency, Spring-boot, Apache Kafka, Restful APIs, Legacy Systems, Microservices
- **Published:** November 3, 2026
- **Apply:** https://www.client-server.com//job/principal-backend-engineer-java-spring-boot-aws-1/apply

## About the Role

* You have experience within a financial services or Fintech environment
 * You have strong Java development skills including multi-threading and concurrency
 * You have experience with Spring Boot and microservices environments
 * You have strong experience with Kafka
 * You have a good knowledge of REST APIs
 * You have a good understanding of AWS
 * You have a thorough understanding of software development and Computer Science fundamentals such as Object Oriented Programming, Data Structures and Design Patterns
 * You are familiar with DevOps, CI/CD pipelines
 * You're collaborative, enjoy problem solving and interacting with clients

## Description

Are you an experienced Java Software Engineer who enjoys taking technical ownership, leading projects and working directly with clients?

You could be progressing your career at a global technology consultancy, working on complex, long-term transformation projects, primarily within the financial services sector.

As a Principal Backend Engineer, you'll lead the design and delivery of high impact technology projects, helping clients modernise legacy systems, migrate to AWS and introduce modern CI/CD and cloud deployment practices. You'll combine hands-on engineering with technical leadership, problem solving and client engagement.

You'll work alongside a highly collaborative team focused on engineering excellence, continuous improvement and delivering meaningful outcomes for clients.

What you'll be doing:

 * Leading technical projects and client engagements from design through to delivery
 * Developing scalable Java applications using Spring Boot and microservices
 * Modernising and migrating legacy systems to AWS
 * Designing and working with REST APIs and distributed systems
 * Introducing and improving CI/CD and DevOps practices
 * Providing technical expertise and guidance to clients and engineering teams