Jobs at Callsign

Build and own end-to-end product experiences across React and TypeScript frontends, Node services, APIs, infrastructure, and configuration. Design and implement accessible, performant, secure features; write and maintain unit, component, and end-to-end tests; improve CI/CD and development tooling; troubleshoot across system boundaries; and contribute product judgment in the fraud, identity, and authentication domain.

Designs, builds, tests, deploys, and monitors end-to-end full-stack features using Java backend services and modern web interfaces. Develops RESTful APIs, responsive frontends, scalable microservices, and secure applications. Collaborates with Product, UX/UI, QA, and platform teams; participates in code reviews and architecture discussions; supports CI/CD pipelines, production troubleshooting, and continuous technical improvement.

Own and evolve client-facing product surfaces across frontend and backend systems. Build TypeScript/React interfaces, Node services, APIs, infrastructure, and deployment pipelines using GitLab CI/CD, Helm, GitOps, and Terraform. Set standards for accessibility, performance, security, testing, architecture, and release quality. Lead platform migrations and cross-repository changes, make product decisions using user and client insight, mentor junior engineers, and raise team engineering standards. The role is a 12-month fixed-term UK contract.