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.

Design, develop, test, and maintain Java services and APIs within a highly transactional platform. Collaborate with Product, QA, SRE, and App Support teams to deliver secure, scalable software. Participate in refinement sessions, code reviews, deployments, troubleshooting, and continuous improvement. Address technical debt, performance issues, observability, and production reliability while applying microservices, orchestration, workflow, testing, and secure coding practices.

Design, build, test, deploy, and maintain full-stack features using Java backend services, REST APIs, and modern web frameworks. Collaborate with Product, UX/UI, QA, and platform teams in an Agile environment. Own features from architecture through production monitoring, participate in code reviews, troubleshoot issues, improve technical debt, and support secure, scalable digital experiences.

Develop and operate production Java microservices for secure digital identity and telco integrations. Responsibilities include architecture and low-level design, threat modeling, authentication and authorization, performance and reliability engineering, MySQL optimization, Kubernetes and AWS deployments, observability, incident response, mentoring, and technical interviewing.

Manages product releases across non-production and production environments while improving release processes, tracking release health, and coordinating cross-functional teams. Delivers agile training and coaching to multiple scrum teams, develops targeted learning plans, and promotes continuous improvement in delivery reliability, speed, and predictability. Supports QA and DevOps practices, release automation, deployment mechanics, and stakeholder collaboration.