Russian hacker, Vladimir Leonidovitch Levin, attempted the biggest bank heist the world had ever seen via dial-up internet in 1994, Zia Hayat, Callsign CEO and founder, was hooked - armchair fraud became a real possibility. From this moment, Zia knew he wanted to play a part in stopping the bad guys and securing the internet for all. Founded In 2012, Callsign's mission has been to make Digital Identity simple and secure for everyone and everything. In that time, we've grown to over 250 employees, opened offices in UK and Abu Dhabi, been recognised as a WEF Global Innovator and our technology is being used by many of the world's leading financial institutions to keep millions of consumers safe.
But we aren't stopping here. The identity revolution has only just begun, and we are looking to hire the brightest and inquisitive minds to help us make every web, mobile and physical Interaction seamless and secure. If this sounds like you, lets chat.
As a Full Stack Software Engineer at Callsign, you will design, build, and maintain end-to-end features spanning our high-throughput Java backend services and modern web interfaces. You'll work in an Agile, collaborative environment alongside Product, UX/UI Designers, and QA to deliver secure, scalable, and intuitive digital experiences. You will take ownership of features from architectural design through implementation, testing, deployment, and operational monitoring.
Requirements
*Good to have :** Experience with Java 17 and Spring WebFlux with Project Reactor, or Java 21+ Virtual Threads * Production experience with NoSQL systems such as DynamoDB * Production experience with TypeScript and modern frontend state management such as Redux Toolkit or Zustand * Familiarity with design systems, component libraries, and tools like Storybook or Figma * Production experience with microservices architecture, distributed caching with Redis, and event streaming with Kafka * Familiarity with container orchestration, Kubernetes, Helm, and cloud platforms such as AWS or GCP * Familiarity with observability and monitoring tools such as Prometheus, Grafana, OpenTelemetry, or Elastic Stack * Basic understanding of web accessibility and web performance optimisation
Benefits
