Senior Java/React Full Stack Developer

Location: London or Newcastle, UK (Hybrid - ~1 day per week in office / onsite)
Contract: Contract - 6 months with view to extend
Day Rate: £550–£600 per day - Outside IR35

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.

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 is focused 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 into a Principal Software Engineer and play a key role in driving best practices within customer teams.

Interview Process - 2 Stage

1. Screening interview with Talent Acquisition
2. Final panel interview 

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.

• 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.

Core technologies:

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

Nice to have:

• GovUK UI Framework

Why join Appvia?

We are a self-funded, London based startup; providing businesses with a fast and secure way to deploy containerised applications into the cloud.

We are on a mission to enable organisations to make cloud-based software delivery simple and efficient, whilst having the insights into costs, security and cadence. As a company that holds customers at the heart of everything we do, we are looking for candidates that want to make a real change to how Dev and Ops is working in the industry.

With us our customers, like the UK’s Home Office & Bank of England, are harnessing cloud-native technologies, limiting the challenges of infrastructure management and rapidly delivering digital products.

What’s on offer?

• Flexible working with core hours of 10-4pm because we know life happens outside of work
• 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 while you work at Appvia
• 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!

But don’t just take our word for it, you can check out what our Appvians say about us on Glassdoor and by following us on LinkedIn, Twitter and TikTok.

We are proud to be an equal opportunities employer and actively encourage, respect, and recognise diversity of thought and background throughout the business. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity, and disability status.

Note: While all roles are active and approved at the time of posting, the dynamic nature of our start-up means some applications may be processed to pipeline talent for future opportunities rather than current openings. We will strive to keep you informed of any changes to the status of your application.