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# Full Stack Software Engineer

- **Company:** Callsign
- **Location:** UK
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Java (Programming Language), JavaScript (Programming Language), Web Accessibility, Amazon Web Services, HTML5, Cascading Style Sheets (CSS), Continuous Integration, Cross-Site Request Forgery, Data Structures, Relational Databases, Amazon DynamoDB, Elasticsearch, Design of User Interfaces, Monitoring of Systems, Spring Framework, Junit, PostgreSQL, Linux System Administration, MySQL, NoSQL, Object-Oriented Software Development, Oracle (Applications), Open Web Application Security, Package Management Systems, Redis, Mockito, Prometheus, Distributed Caching, SQL Databases, Data Streaming, TypeScript, Web Applications, Web Performance Optimization, Apache Yarn, ReactJS, Grafana, Spring-boot, Cypress (Programming Language), Technical Debt, Cross-Site Scripting (XSS), Backend, Vue.js, Webpack, AngularJS, Material UI, Solid Principles, Kubernetes, Apache Kafka, Build Tools, Figma, Npm(Software), Front End Software Development, React Redux, React Testing Library, Restful APIs, Docker, Microservices
- **Published:** October 6, 2026
- **Apply:** https://startup.jobs/software-engineer-full-stack-callsign-10298880

## About the Role

* 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.

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

## Description

* Design, build, and maintain scalable Java-based backend services and modern frontend web applications.
 * Develop robust RESTful APIs and integrate frontend interfaces seamlessly with backend systems.
 * Build responsive, accessible, and performant user interfaces using modern web frameworks.
 * Write clean, testable, and maintainable code across the full stack following engineering best practices.
 * Collaborate closely with Product Managers, UX/UI Designers, QA, and platform teams to translate user requirements into technical solutions.
 * Participate in peer code reviews, contribute to architectural discussions, and proactively address technical debt.
 * Support deployment pipelines, troubleshoot production issues across frontend and backend layers, and drive continuous improvement.