Job Title: Senior Software Engineer in Test
Type: Inside IR35 Contract
Rate: £600-£650 per day
Duration: 6 months minimum (likely to extend)
Location: London - 3 days on site (Canary Wharf) 

A large fintech business are looking for a senior-level quality engineer with a strong software engineering mindset to help shape and safeguard new UI and platform capabilities across complex workflow-driven systems on a contract-basis. This role sits embedded within product engineering, operating in a shared ownership model alongside Java and React developers, with a heavy emphasis on automation.
What you’ll be doing

• Building and maintaining automated coverage across the stack, from APIs through to user journeys, using established internal tooling and frameworks.
• Evolving existing test frameworks where required, while staying aligned with core engineering standards.
• Working closely with frontend and backend engineers to ensure critical paths are well understood, well tested, and production-ready.
• Participating in code and design discussions with a quality-first lens across the full delivery lifecycle.
• Applying targeted exploratory testing early, where automation is still catching up with new functionality.
• Ensuring automated testing is a first-class citizen within CI/CD, enabling fast and reliable releases.
• Validating business-critical workflows within post-trade / collateral-style domains, where correctness really matters.

What we expect

• A solid engineering foundation, backed by significant hands-on experience in test automation.
• Deep familiarity with Java or JavaScript/TypeScript-based automation, including modern UI and API testing approaches.
• Comfort working across React-based front ends, RESTful services, and distributed architectures.
• Experience operating in environments without a dedicated QA function, where quality is owned collectively.
• Strong problem-solving skills and the ability to communicate clearly with engineers and stakeholders alike.

Bonus points for

• Exposure to cloud-native platforms (particularly AWS).
• Working knowledge of containerised environments.
• Experience with performance or resilience testing.
• Familiarity with workflow engines, event-driven systems, or highly distributed platforms

Please note that you must be located in/around London and have UK right to work to be considered for this position - thank you!