Senior Backend Engineer - APIs, Reliability & Production

Addition UK is seeking a Senior Developer to own production systems, build robust APIs, and help scale a well-established SaaS platform used by thousands of customers globally. You will thrive on solving hard problems, balancing engineering excellence with delivery, and mentoring teammates in a fast-paced environment.

Expect to work on distributed services, cloud-native deployments, and third-party integrations while improving reliability, observability, and performance.