Software Engineer -Backend

Posted: 2025-05-02

•Are you curious, excited by experimentation and always looking to innovate? •Do you want to work in embedded payments where you can keep learning and developing whilst getting hands-on experience? •Do you want to have the opportunity to play an important role in a rapidly growing and exciting Fintech business?

If so, we would love to connect and collaborate!

We want to hire ambitious, and value-adding talent into Modulr, one of the fastest growing payments businesses in the UK and Europe. Modulr is experiencing significant growth, and in this role you will work in a cross-functional team who are asked to solve a problem, rather than be handed a task to do. This is an excellent opportunity to work in a high-growth environment with a fast-paced and collaborative culture where you will have great opportunities to work on challenging problems.

In this role you will design, build, and evolve the next generation of Modulr’s event-driven payments platform. You’ll work across the full engineering lifecycle—from shaping technical approaches to delivering production-grade software—within a squad that values ownership, excellence, and continuous improvement.

Specific duties

Engineering & Architecture •Design and develop backend services using Java (17+) or similar OO languages. •Build and evolve microservices and distributed, event-driven components in a cloud-native environment. •Contribute to architectural patterns that support throughput, resilience, reliability, and observability. •Design clean, well-documented RESTful APIs and service contracts. •Work with relational data stores, especially PostgreSQL, and contribute to data modelling. Distributed Systems & Reliability •Engineer solutions for concurrency, idempotency, fault tolerance, retries, and high availability. •Improve system performance, reduce latency, and identify bottlenecks across services. •Build systems with strong observability—logs, metrics, tracing—ensuring issues can be diagnosed quickly.

Quality & Testing •Develop comprehensive automated tests using frameworks such as JUnit, Mockito, Cucumber. •Participate in design and code reviews, helping raise engineering standards across the team. •Advocate for code quality, maintainability, and long-term technical health. DevOps, Cloud & Tooling •Use and improve deployment pipelines and operational tooling (Docker, Kubernetes, CI/CD, AWS services). •Contribute to internal frameworks, shared libraries, and engineering best practices. •Help shape the evolution of our platform toward a more flexible, modern architecture. Collaboration & Delivery •Work in an agile environment, contributing to planning, design discussions, and iterative delivery. •Collaborate across squads to shape technical solutions that span multiple systems. •Document best practices, reference architectures, and design approaches others can rely on.