Software Engineer (Full Stack)
Key Skills for This Role
Full Job Posting
Requirements
- 3–6 years of commercial full-stack software development experience.
- Strong backend expertise in Java, Spring Boot, and RESTful API design; gRPC experience is a plus.
- Hands-on frontend experience with modern JavaScript or TypeScript frameworks, preferably React. Commercial experience with Vue.js or Angular is also welcome.
- Proficiency in JavaScript, HTML5, CSS3/SCSS, and responsive UI design.
- Working knowledge of frontend build tools and package managers such as Vite, Webpack, npm, or yarn.
- Solid experience with relational databases such as MySQL, PostgreSQL, or Oracle, and SQL query writing.
- Strong understanding of OOP fundamentals, SOLID principles, and data structures and algorithms.
- Familiarity with testing frameworks across the stack, such as JUnit, Mockito, Jest, React Testing Library, or Cypress.
- Familiarity with Docker, Linux environments, and CI/CD pipelines.
- Exposure to microservices architecture.
- Awareness of secure coding practices including OWASP Top 10, XSS, CSRF prevention, and secure authentication/token management.
- Strong communication, analytical thinking, and collaboration skills.
- 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
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
- Private Premium Health Insurance
- Visa costs including 1 month paid hotel stay on arrival
- Annual Airfare Allowance for the home country
- 3 months full pay maternity leaves & 2 weeks full pay paternity leaves
- 25 days of annual leave + Callsign Bank Holiday (not included in holiday allowance)
- Competitive Salary
- Gratuity as EOSB
Preferred Qualifications
- Strong backend expertise in Java, Spring Boot, and RESTful API design; gRPC experience is a plus.
About Callsign
A private cybersecurity software company helping businesses authenticate users and prevent digital fraud.
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