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# Software Engineer (Backend)

- **Company:** Lorum
- **Location:** London, UK
- **Experience:** Experienced
- **Salary:** £66,004.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, C++ (Programming Language), Code Review, Continuous Integration, Data Stores, PostgreSQL, Queueing Systems, Systems Integration, Concurrency, Backend, Kotlin, Event Driven Architecture, Build Tools, Graphql, Stream Processing, Docker, Golang
- **Published:** September 30, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5903639952

## About the Role

* 3+ years building backend systems in a strongly typed language (e.g. Rust, Go, Java, Kotlin, C++)
 * Commercial experience with distributed services or APIs
 * A real interest in working in Rust day to day, shown through prior Rust work or demonstrable learning. We don't expect you to know our exact stack
 * Solid backend fundamentals: concurrency, data modelling, transactions, reliability and observability
 * Experience designing and consuming APIs (REST/gRPC/GraphQL) and integrating with services and data stores
 * A strong testing mindset and familiarity with CI/CD
 * Able to work hybrid, 3 days/week in the London office

 * Rust in production, or substantial personal/OSS Rust projects
 * Experience in fintech, payments, banking, trading or other financial infrastructure
 * Event-driven architectures, message queues and stream processing
 * PostgreSQL (or similar) and data-intensive workloads
 * AWS/GCP, Docker and Kubernetes
 * Regulated or high-assurance environments

 * Correctness first: you'd rather ask one more question than ship an ambiguous money flow
 * Owns problems end to end, from design to production support, not just executing tickets
 * Clear written communication; documents decisions and trade-offs
 * Comfortable with the pace and ambiguity of a fast-growing clearing and treasury infrastructure business
 * Low ego, high standards; gives and takes direct feedback well

## Description

We're looking for Backend Software Engineers to join our engineering team in London. You'll build the systems that move money for banks: the services, ledgers and integrations behind Lorum's clearing and treasury products, mostly in Rust. Correctness matters more than cleverness here. A payment that settles twice, or not at all, is a real problem for a real bank. You'll join a small, cross-functional team, own services end to end from design through production support, and work closely with Product, Operations and Security & GRC as we scale volumes and prepare for a regulated trust bank environment.

 * Design, build and maintain backend services and APIs in Rust (or a similar strongly typed language, with a path to Rust)
 * Implement robust domain logic for clearing, payments, accounts and reconciliation
 * Build systems for high-volume, high-reliability financial workloads, designed with metrics, logs and tracing from day one
 * Take part in on-call and incident response for the services you own
 * Work with Security and GRC so services meet requirements such as SOC 2 and ISO 27001
 * Partner with Product to scope work, review code, write thorough tests and help raise the technical bar

 * Ship production changes to a core clearing or treasury service, and join the on-call rotation for it, within 3 months
 * Own the design and delivery of a meaningful feature or integration end to end by month 6
 * Measurably improve the reliability, throughput or reconciliation accuracy of a service you own by month 12
 * Help raise engineering standards across the team through code review, testing and documentation