Senior Java/React Full Stack Developer - Appvia - Security Clearance eligibility required. Location: London, UK (Hybrid - ~1-2 days per month in office / onsite) Contract: Permanent, Full-time Package: £70,000-80,000 10% Bonus 10% Shares Benefits (see more below) About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy, helping organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering capability focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience. We work across complex, high-impact environments in both the public and private sector, delivering solutions where quality, scalability, and reliability are critical. About the Role We are hiring multiple Senior Java / React Full Stack Developers to join a growing Software Engineering practice, supporting a large-scale modernisation and AI-enabled transformation programme. This is a hands-on, client-facing role where you will help shape and deliver modern software solutions within complex environments working on what is effectively a greenfield build within a brownfield ecosystem, introducing new architecture, tooling, and engineering standards to enable long-term scalability. You will report into a Principal Software Engineer, contributing to both delivery and the continued growth of Appvia’s software engineering capability. Interview Process - 2 Stage Discovery conversation with Talent Acquisition Technical Interview with Engineering Team Final Interview with Leadership Important You must be eligible for UK Security Clearance (SC) : British Passport or ILR Resided in the UK for the last 5 years No criminal record or financial irregularities Requirements About You You are a strong full-stack engineer with a consulting mindset, comfortable working in complex environments and influencing how software is designed and delivered. You will bring: Strong experience with React and modern front-end development Strong backend experience with Java (Spring Boot) A solid grounding in Domain Driven Design (DDD) Experience working with microservices architectures Full-stack capability across UI, API, and data layers Experience working in cloud-native environments (ideally AWS) Interest or experience in AI-assisted development to improve productivity and quality Confidence working directly with stakeholders and guiding technical decisions Responsibilities Design and deliver modern Java / React applications within complex systems Contribute to modernisation of legacy systems into scalable, service-based architectures Apply DDD principles to improve system structure and maintainability Improve development workflows, testing approaches, and engineering standards Collaborate with platform and test engineers to deliver integrated, end-to-end solutions Introduce and embed modern tooling and AI-assisted development practices Act as a senior consultant within delivery teams, influencing engineering best practices Support teams in building scalable, maintainable, and high-quality software Technical Skills Core technologies: Java / Spring Boot React / Node.js HTML / CSS / JavaScript MongoDB Docker / Kubernetes Maven GitLab Nice to have: Playwright or modern testing frameworks GovUK Design System / UI Framework Benefits 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? ⚖️ Work-life balance 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 25 days’ holiday a year, plus bank holidays An additional day off for your birthday Enhanced maternity and paternity to full pay Workplace Nursery Benefit to help working parents For your well-being Full Private Healthcare cover for you with partners and children covered 50% Death in Service Cycle to Work scheme Electric Car Scheme Pension plus a salary sacrifice option for even greater savings Employee Assistance Programme Free hygiene products available in the London office Mental health support Free therapy through AXA Access to the Headspace App Trained Mental Health First Aiders Other fun perks Learning budget of £1,000 a year 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.