Full-Stack Java/Spring Engineer | React Frontend

Callsign; England; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Pension scheme

Private medical cover

Life assurance

Learning & Development budget

Cycle to work

Family leave

25 days annual leave

Volunteer program

Job summary

Callsign is seeking a Full Stack Software Engineer to design, build, and maintain high-throughput Java backends and modern web interfaces. You’ll own features from architecture through deployment in an Agile environment with Product, UX, QA, and platform teams.

You’ll work across the stack, delivering scalable APIs, responsive UIs, and robust testing. Collaboration and secure coding practices are essential in this role.

Qualifications

• 3–6 years of commercial full-stack software development experience.
• Strong backend experience in Java, Spring Boot, and RESTful API design; gRPC experience is a plus.
• Hands-on frontend experience with modern JavaScript/TypeScript frameworks (React preferred; Vue.js or Angular welcome).
• Proficiency in HTML/CSS and responsive UI; knowledge of frontend build tools (Vite, Webpack, npm/yarn).
• Relational databases experience (MySQL, PostgreSQL, Oracle) and SQL querying.
• Strong OOP/SOLID fundamentals; familiarity with testing frameworks (JUnit, Mockito, Jest, RTL, Cypress).
• Familiarity with Docker, Linux, CI/CD; exposure to microservices and secure coding practices.

Responsibilities

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

Skills

Java

Spring Boot

REST APIs

gRPC

JavaScript

TypeScript

React

Vue.js

Angular

HTML/CSS

SQL

OOP/SOLID

Testing

Docker

CI/CD

Microservices

Security best practices

Tools

Vite

Webpack

Job description

Callsign is seeking a Full Stack Software Engineer to design, build, and maintain high-throughput Java backends and modern web interfaces. You’ll own features from architecture through deployment in an Agile environment with Product, UX, QA, and platform teams.

You’ll work across the stack, delivering scalable APIs, responsive UIs, and robust testing. Collaboration and secure coding practices are essential in this role.