Senior Java/React Full Stack Developer

We are looking for a Senior Java/React Full Stack Developer to join Appvia on a contract basis, working as a hands-on engineering consultant within our Solutions Engineering team. This role focuses on modernising large, complex software systems, reducing technical debt, and improving delivery speed and reliability. You will work closely with client teams, alongside platform and test engineers, helping introduce modern development practices and AI-assisted engineering techniques to improve developer productivity. You will report to a Principal Software Engineer and play a key role in driving best practices within customer teams., * Design and deliver modern Java/React applications within complex systems

• Improve development workflows, testing approaches, and developer productivity
• Contribute to breaking down monolithic systems into well-defined services
• Apply DDD principles to improve maintainability and system clarity
• Collaborate with platform and test engineers to deliver end-to-end solutions
• Support teams in adopting modern tooling and AI-assisted development practices
• Act as a senior consultant within delivery teams, influencing best practices

Technical Skills

Core technologies:

• Java / Spring
• React
• XML / HTML / CSS
• Mongo DB
• Playwright
• Docker / Kubernetes
• Maven
• GitLab

Nice to have:

• GovUK UI Framework

You are an experienced hands-on Java/React developer and consultant who enjoys working on complex systems and influencing how software is built and evolved. You bring:

• Strong experience with React and modern front-end development
• Strong experience with Java backend development (Spring, Mongo)
• A solid grounding in Domain Driven Design (DDD)
• Experience working with microservice-based architectures
• Full-stack awareness and the ability to collaborate across disciplines
• Interest or experience in AI-assisted development to improve code quality and delivery speed
• Confidence working directly with clients and guiding technical decisions

Why join Appvia?

• Flexible working with core hours of 10-4pm
• Hybrid working - only one compulsory office day per month
• Free hygiene products available in the London office
• Trained Mental Health First Aiders
• Your own MacBook Pro
• Dog-friendly office
• Wear what makes you comfortable
• Free snacks in the office
• Pool table & ping pong table
• Regular team socials, board game nights, industry meetups and more

Appvia is a specialist cloud, platform, and solutions engineering consultancy. We help organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering work focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience.