Backend Engineer

Summary: The Senior Backend Engineer (Go/Java) role involves joining a critical API team within a global fintech company, focusing on high-throughput backend services and real-time payment routing. The position is contract-based with the potential for permanent employment, requiring ownership of complex problems from the outset. The role demands expertise in Go and/or Java, along with experience in building high-volume distributed systems. The position is hybrid, requiring three days in the office in Central London.

Key Responsibilities:

• Join a critical API team responsible for high-throughput backend services and real-time payment routing.
• Own complex problems end-to-end from day one.
• Contribute to foundational infrastructure affecting payment acceptance rates for global brands.

Key Skills:

• Demonstrable seniority as a backend engineer owning complex services in production.
• Production-level expertise in Go and/or Java.
• Experience building or maintaining high-volume, low-latency distributed systems.
• Strong API design skills.
• Hands-on experience with AWS cloud-native deployment.
• A systems-thinking approach to performance, correctness, and failure modes under load.
• Background in payments, fintech, or financial services is highly advantageous.

Salary (Rate): £500 per day

City: Central London

Country: UK

Working Arrangements: hybrid

IR35 Status: inside IR35

Seniority Level: Senior

Industry: IT

Detailed Description From Employer:

Title: Senior Backend Engineer (Go/Java) - Global Fintech Contract

Location: Central London (Hybrid, 3 days in-office)

Engagement: Contract with potential to convert to permanent

Rate: Competitive

The Role: You will join a critical API team responsible for high-throughput Back End services and Real Time payment routing decisions. This is foundational infrastructure where your work directly affects payment acceptance rates for some of the fastest-moving brands globally. You will own complex problems end-to-end from day one.

What You Will Bring:

• Demonstrable seniority as a Back End engineer owning complex services in production.
• Production-level expertise in Go and/or Java.
• Experience building or maintaining high-volume, low-latency distributed systems.
• Strong API design skills.
• Hands-on experience with AWS cloud-native deployment.
• A systems-thinking approach to performance, correctness, and failure modes under load.
• Background in payments, fintech, or financial services is highly advantageous.

How to apply

This role is being filled exclusively through Randstad Digital. To be considered, please send your CV along with a brief note on your experience with Go/Java and high-volume distributed systems.

Randstad Technologies is acting as an Employment Business in relation to this vacancy.