Senior Java​/React Full Stack Developer

Appvia Newcastle Upon Tyne, England, United Kingdom

Location:

London or Newcastle, UK (Hybrid - 1 day per week in office)

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.

• Screening interview with Talent Acquisition
• 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

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

• GovUK UI Framework

• 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 Mac Book 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!

Referrals increase your chances of interviewing at Appvia by 2x

Mid‑Senior level

Contract

IT Services and IT Consulting

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, 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.