Full Stack Developer

Full-Stack Developer – Java & React Salary: £50,000–£65,000, depending on experienceLocation: Onsite in Central London or Glasgow Role Summary NETbuilder is looking for Full-Stack Developers with 4+ years of professional Java development experience to join our engineering team. We're looking for developers with strong core Java and Spring/Spring Boot fundamentals who are comfortable working through complex or ambiguous requirements, asking the right clarifying questions, and translating requirements into well-designed technical solutions. You will build, enhance, and support scalable web applications, REST APIs, and enterprise platforms using Java, Spring Boot, React, JavaScript/TypeScript, Oracle/MySQL, Git, and CI/CD tooling. You’ll work across the full Software Development Life Cycle (SDLC), from requirements analysis and solution design through development, testing, deployment, production support, and continuous improvement. About NETbuilder NETbuilder is a leading provider of digital solutions, software, consulting, and managed services. Since 1999, we have delivered end-to-end solutions that help organisations innovate and grow. We're hiring motivated Full-Stack Developers to work on enterprise technology solutions for our clients. Successful candidates will combine strong technical fundamentals with an analytical and consultative approach, working collaboratively to understand requirements and deliver appropriate, high-quality solutions. Key Responsibilities Design, develop, and maintain full-stack solutions using Java, Spring/Spring Boot, and React.Analyse complex technical requirements, identify ambiguities, and ask appropriate clarifying questions.Design secure, scalable, maintainable, and RESTful APIs following established API design conventions.Make appropriate technical design decisions around identifiers, data types, pagination, error handling, HTTP methods, and status codes.Create and maintain OpenAPI/Swagger specifications and interface contracts.Design relational data models and implement persistence layers using Oracle and/or MySQL.Build reusable React components using modern JavaScript and TypeScript practices.Write optimised SQL queries and support database performance tuning.Build, maintain, and troubleshoot CI/CD pipelines using Jenkins and/or Spinnaker.Manage source control, branching strategies, pull requests, and code reviews using Git.Contribute across requirements analysis, design, development, testing, deployment, and production support.Investigate production incidents, perform root cause analysis, and implement appropriate fixes.Produce clear technical documentation, including API specifications, deployment guides, runbooks, and support documentation.Collaborate with architects, QA engineers, DevOps teams, product owners, and business stakeholders. Essential Skills & Experience 4+ years of professional Java development experience.Strong understanding of core Java fundamentals.Strong practical experience with Spring and Spring Boot.Good understanding of Dependency Injection and Spring application architecture.Experience designing and developing RESTful APIs.Good understanding of REST principles, including HTTP methods, status codes, resource modelling, identifiers, data types, pagination, and error handling.Experience with React and modern JavaScript/TypeScript.Experience with Oracle and/or MySQL.Strong SQL and database fundamentals.Experience using Git and standard software development practices.Hands-on CI/CD experience, ideally with Jenkins and/or Spinnaker.Strong analytical and troubleshooting skills.Ability to understand complex requirements, identify ambiguities, and ask appropriate clarifying questions.Ability to clearly explain and justify technical design decisions.Strong communication and documentation skills. Preferred Skills & Experience Docker and Kubernetes experience.OpenAPI/Swagger experience.Experience with OAuth2, JWT, and API security.Observability experience, including logging, monitoring, metrics, and tracing.Experience supporting enterprise production environments.Experience with Test-Driven Development (TDD) and automated testing.Experience with AI-assisted software development tools.Previous consulting or client-facing experience. What We're Looking For Beyond technical experience, we're looking for developers who demonstrate a structured and thoughtful approach to problem-solving. You should be able to understand complex requirements, recognise when information is unclear, and ask relevant questions rather than making assumptions. You should also be confident explaining your technical decisions and applying strong Java, Spring/Spring Boot, and REST API design fundamentals in practice. Database & Infrastructure Work with Oracle and MySQL databases to support application functionality and performance.Implement database schemas, indexing strategies, and data access layers.Support containerised deployments using Docker and environments such as Kubernetes.Contribute to application performance, availability, resiliency, and data governance. Quality, Governance & Security Follow secure coding practices and enterprise development standards.Implement authentication and authorisation mechanisms using OAuth2 and JWT where appropriate.Write maintainable, testable, high-quality code.Contribute to testing and code reviews throughout the SDLC.Ensure solutions meet relevant security, compliance, and audit requirements. Continuous Improvement & Operational Support Identify opportunities to improve engineering efficiency, automation, and application performance.Contribute to logging, monitoring, metrics, and tracing initiatives.Provide production support for business-critical applications.Participate in incident resolution and root cause analysis.Maintain technical and operational documentation.Contribute to knowledge sharing and continuous improvement across the engineering team.