Principal Backend Engineer Java Spring Boot AWS

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

Salary: £40,000 - 70,000 per year

Requirements:

• We require experience within a financial services or Fintech environment.
• We require strong Java development skills, including multi-threading and concurrency.
• We require experience with Spring Boot and microservices environments.
• We require a good knowledge of REST APIs.
• We require a good understanding of AWS.
• We require a thorough understanding of software development and Computer Science fundamentals such as Object Oriented Programming, Data Structures and Design Patterns.
• We require familiarity with DevOps and CI/CD pipelines.
• We are looking for someone who is collaborative, enjoys problem solving, and interacting with clients.

Responsibilities:

• We lead technical projects and client engagements from design through to delivery.
• We develop scalable Java applications using Spring Boot and microservices.
• We modernise and migrate legacy systems to AWS.
• We design and work with REST APIs and distributed systems.
• We introduce and improve CI/CD and DevOps practices.
• We provide technical expertise and guidance to clients and engineering teams.

Technologies:

• AWS
• Backend
• CI/CD
• DevOps
• Support
• Java
• REST
• Spring
• Spring Boot
• microservices
• Cloud

More:

We are a global technology consultancy working on complex, long-term transformation projects, primarily within the financial services sector. This is a Principal Backend Engineer / Developer role based in London with a hybrid work-from-home policy, requiring three days a week in the London City office or at client sites. You will join a friendly, diverse, upbeat, and highly collaborative team focused on engineering excellence, continuous improvement, and delivering meaningful outcomes for clients. The package includes a salary of up to 120k, pension, life assurance, income protection, private medical care for you and your family including mental health support, travel insurance, charitable giving, gym membership for you and your family, and a flexible holiday scheme.

last updated 36 week of 2026