Principal Backend Engineer - Java/Spring on AWS (Hybrid)

Client Server; Greater London; Hybrid; GBP 40,000 - 70,000; Full time

Benefits offered by this job

Pension

Life assurance

Income protection

Private medical care for you and your家

Travel insurance

Gym membership

Flexible holiday scheme

Job summary

Client Server in London is seeking a Principal Backend Engineer to lead critical Java-based projects. You will design and build scalable Spring Boot microservices, modernise legacy systems on AWS, and shape REST API architectures across client portfolios.

They seek a collaborative problem-solver with strong CS fundamentals and experience conveying complex concepts to clients. This hybrid London role includes a substantial salary package and comprehensive benefits.

Qualifications

• Experience in financial services or fintech environments is required.
• Strong Java development skills with multi-threading and concurrency.
• Experience with Spring Boot and microservices environments.
• Good knowledge of REST APIs and AWS is essential.
• Solid understanding of OOP, data structures and design patterns.
• Familiarity with DevOps and CI/CD pipelines.
• Collaborative, problem solving, and client-facing mindset.

Responsibilities

• Lead technical projects and client engagements from design through delivery.
• Develop scalable Java applications using Spring Boot and microservices.
• Modernise and migrate legacy systems to AWS.
• Design and work with REST APIs and distributed systems.
• Introduce and improve CI/CD and DevOps practices.
• Provide technical guidance to clients and engineering teams.

Skills

Java

Multithreading

Concurrency

Spring Boot

Microservices

REST APIs

AWS

OOP/DS/Design patterns

DevOps/CI-CD

Client interaction

Tools

Spring

Cloud

CI/CD

Docker

Kubernetes

Job description

Client Server in London is seeking a Principal Backend Engineer to lead critical Java-based projects. You will design and build scalable Spring Boot microservices, modernise legacy systems on AWS, and shape REST API architectures across client portfolios.

They seek a collaborative problem-solver with strong CS fundamentals and experience conveying complex concepts to clients. This hybrid London role includes a substantial salary package and comprehensive benefits.