Senior Backend Engineer (Java/.Net & Microservices)

Senior Backend Engineer (.NET / Java Microservices)Contract: Inside IR35Duration: 6 Months+Hybrid – 2 days per week on site in London

We’re seeking a Senior Backend Engineer to design, build and enhance scalable backend services and APIs within a complex enterprise environment. You’ll play a key role in delivering modern microservices while contributing to technical design and engineering best practice.

Key Responsibilities

• Design and develop backend services using C#/.NET and Java (Spring Boot).
• Build and support REST APIs and microservices.
• Contribute to architecture, technical design and system integration.
• Troubleshoot, optimise and support production systems.
• Collaborate with stakeholders and mentor other engineers.

Essential Skills

• Strong commercial experience with C#/.NET and Java (Spring Boot).
• Proven delivery of microservices and REST APIs.
• Experience with distributed systems and enterprise integration.
• Strong SQL experience (SQL Server and/or Oracle).

We’re Looking For

• Engineering Ownership – Takes responsibility for delivery end-to-end, including debugging, optimisation and resolving production issues.
• Microservices & Distributed Systems – Strong understanding of scalable, distributed architectures and the challenges around reliability and performance.
• Event-Driven Thinking – Knowledge of event-driven architectures, decoupled systems and real-time data flows.
• Architecture & Design – Applies sound engineering principles and contributes to solution design and technical decisions.
• Seniority & Influence – Operates at Senior Engineer or Tech Lead level, mentors others, challenges requirements and engages confidently with stakeholders.
• Enterprise Experience – Experience delivering within complex enterprise environments. Financial services experience is advantageous but not essential.

This is an excellent opportunity for a senior engineer who enjoys solving complex technical challenges and influencing both architecture and delivery within a collaborative engineering team.

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