Contract - Senior/Principal Java Developer

JR United Kingdom; London; On-site; GBP 75,000 - 110,000; Full time

Job summary

A major financial institution seeks a Principal Java Developer to lead critical systems work while improving legacy platforms and delivering new functionality. This role involves technical leadership and collaboration with various teams, focusing on CI/CD processes and modern API design within a dynamic environment.

Qualifications

• Proven experience supporting large-scale, business-critical systems.
• Strong background in Java and ideally C#.
• Experience with CI/CD pipelines and modern deployment practices.

Responsibilities

• Lead critical systems work modernising legacy platforms and improving availability.
• Work closely with infrastructure, architecture, and infosec teams.
• Guide CI/CD improvements and REST API design.

Skills

Java

C#

CI/CD

REST API design

Angular

Legacy systems

Job description

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Client:

Source Technology

Location:

london, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

4

Posted:

16.06.2025

Expiry Date:

31.07.2025

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Job Description:

We’re working with a major financial institution looking to scale out its engineering function with a Principal Java Developer to lead critical systems work. This is a hands-on role within a high-performing team modernising legacy platforms, improving availability, and delivering new functionality across the estate.

You’ll be working closely with infrastructure, architecture, and infosec teams to support high-availability production systems. The role also involves guiding CI/CD improvements, REST API design, and steering collaborative technical decisions across squads.

What they’re looking for:

• Proven experience supporting large-scale, business-critical systems
• Strong background in Java and ideally C#
• Some front end exposure (Angular ideally but other frameworks considered). Note the role is back end focused.
• Comfortable working with legacy systems and large enterprise environments
• Confident leading technical conversations across multiple engineering disciplines
• Experience with CI/CD pipelines and modern deployment practices
• Greenfield REST API design including HATEOAS implementation
• Angular, React or frontend exposure
• Familiarity with Snowflake or backend SQL variants

This is a great opportunity for an experienced Java Developer to join a prestigious financial player. If you’re someone who thrives in complex environments and enjoys technical leadership alongside delivery, apply now.