Backend Software Engineer (Rust)

About the role

Lorum is a clearing and treasury infrastructure company founded in 2023, which has grown 55x in 2025 and is applying for a U.S. national trust bank charter. It is looking for an experienced backend engineer to join a small, cross-functional team in New York and help build its foundational infrastructure. The role suits someone who enjoys fast-moving environments, thrives in ambiguity and wants to build high-quality backend systems, with a particular interest in distributed systems and Rust. The position is in the office three days a week.

Key responsibilities

• Design, build and maintain backend services and APIs in Rust (or similar languages with a path to Rust), implementing domain logic for clearing, payments, accounts and reconciliation.
• Take part in architectural decisions and evolve service boundaries and integrations.
• Build systems for high-volume, high-reliability financial workloads, with metrics, logs and tracing, and take part in on-call and incident response.
• Work with Security and GRC teams on security and compliance (e.g. SOC 2, ISO 27001), secure coding, authentication and authorization, and internal documentation.
• Partner with Product Managers, break projects into tasks, review code and help maintain engineering standards.
• Write unit, integration and property-based tests, support CI/CD, contribute to tooling and share knowledge.

Required profile

• 3+ years of experience building backend systems in a strongly typed language such as Rust, Go, Java, Kotlin or C++.
• Commercial experience in backend or systems engineering on distributed services or APIs.
• Genuine interest in working with Rust day to day; prior Rust experience or demonstrable learning is important.
• Solid understanding of concurrency, data modelling, transactions, reliability and observability.
• Experience designing and consuming APIs (REST/gRPC/GraphQL) and integrating with other services and data stores.
• Strong testing mindset, CI/CD familiarity, clear communication and collaboration with Product, Operations and other engineers.

Nice-to-haves

• Rust in production or substantial personal/OSS projects.
• Fintech, payments, banking or trading experience.
• Event-driven architectures, message queues, stream processing, PostgreSQL, AWS/GCP, Docker/Kubernetes, and regulated environments.

What we offer

• Flexible vacation policy, private healthcare and employee stock ownership (ESOP).
• Flexible working and autonomy.
• Two annual "pay it forward" days for volunteering and three wellness days per quarter.