Senior Backend Java Software Engineer

Senior Backend Software Engineer (Java) - Identity Management Services

Location: Dunton, Essex (Must be on-site 4x a week) Contract: Initial 7 Month Contract Rate: £460- £560 a day (Inside IR35) Build the Future of Enterprise Identity

We’re looking for an experienced Senior Backend Software Engineer to join a high-performing Identity Management Services team, building the core platform behind a large-scale enterprise identity infrastructure.

You’ll design and develop secure, resilient, high-scale Java services while providing technical leadership, mentoring engineers and driving engineering best practices across the team. The Role

• Design and develop high-scale Back End services using Java.
• Build secure, resilient and highly available applications.
• Provide technical leadership and mentor engineers.
• Champion TDD, pair programming and clean coding practices.
• Contribute to architecture and technical design.
• Support CI/CD pipelines, DevOps practices, monitoring and logging.
• Collaborate within Agile teams to deliver high-quality software.

Essential Skills & Experience

• 8+ years’ commercial Back End Java development.
• Experience designing and building high-scale Back End services.
• Background delivering highly transactional systems within regulated environments (Banking, Financial Services, FinTech, Telecoms or similar).
• Strong knowledge of Java frameworks and Server Side technologies.
• Experience with CI/CD, Git and DevOps practices.
• Strong relational database experience.
• Experience with security-focused development, ideally Identity & Access Management or Identity Infrastructure.
• Technical leadership experience with mentoring responsibilities.
• Excellent communication skills and Agile delivery experience.

Desirable

• Identity & Access Management (IAM)
• Google Cloud Platform (GCP)
• Networking knowledge (subnets, Firewalls, VPNs, load balancing)
• Monitoring and logging platforms

What We’re Looking For

This role suits engineers who are passionate about engineering excellence and collaborative development. You’ll be comfortable practising Test Driven Development (TDD) daily, pair programming as part of your normal workflow, mentoring others and building clean, scalable Back End solutions.

Please note: Pair programming and TDD are key parts of the interview process, so candidates must have genuine, hands-on experience with both. Why Join?

• Build a business-critical identity platform.
• Work on complex, high-scale Back End systems.
• Influence architecture and engineering standards.
• Join a collaborative, engineering-led team.
• Long-term contract on a major technology programme.

If you’re a Senior Java Backend Engineer looking to work on scalable, enterprise-grade systems in an engineering-first environment, we’d love to hear from you.

Disclaimer Not withstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies. Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.

• 8+ years’ commercial Back End Java development.
• Experience designing and building high-scale Back End services.
• Background delivering highly transactional systems within regulated environments (Banking, Financial Services, FinTech, Telecoms or similar).
• Strong knowledge of Java frameworks and Server Side technologies.
• Experience with CI/CD, Git and DevOps practices.
• Strong relational database experience.
• Experience with security-focused development, ideally Identity & Access Management or Identity Infrastructure.
• Technical leadership experience with mentoring responsibilities.
• Excellent communication skills and Agile delivery experience.

Desirable

• Identity & Access Management (IAM)
• Google Cloud Platform (GCP)
• Networking knowledge (subnets, Firewalls, VPNs, load balancing)
• Monitoring and logging platforms

What We’re Looking For

This role suits engineers who are passionate about engineering excellence and collaborative development. You’ll be comfortable practising Test Driven Development (TDD) daily, pair programming as part of your normal workflow, mentoring others and building clean, scalable Back End solutions.

Please note: Pair programming and TDD are key parts of the interview process, so candidates must have genuine, hands-on experience with both. Why Join?

• Build a business-critical identity platform.
• Work on complex, high-scale Back End systems.
• Influence architecture and engineering standards.
• Join a collaborative, engineering-led team.
• Long-term contract on a major technology programme.

If you’re a Senior Java Backend Engineer looking to work on scalable, enterprise-grade systems in an engineering-first environment, we’d love to hear from you.

Disclaimer Not withstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies. Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.