Senior Full Stack Developer

Internal Title: Senior Full Stack Developer

Location: London, UK (Hybrid - typically 1-2 days per month in office)

Contract: Permanent, Full-time OR Outside IR35 Contract, 6 months with view to extend

Day Rate (contract): £500-550 per day

Package (perm): £70,000 - £80,000 + 10% Bonus + 10% Shares + Benefits (see more below)

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.

We’re hiring multiple Senior Full Stack Engineers (Java / TypeScript) to join a growing Software Engineering practice supporting a major modernisation and AI-enabled transformation programme.

This is a hands-on, client-facing role where you’ll help design and deliver modern software solutions in complex environments. You’ll be working on what is effectively a greenfield build within a brownfield ecosystem, introducing new architecture, tooling, and engineering standards to enable long-term scalability and resilience.

You will report into a Principal Software Engineer, contributing both to day-to-day delivery and the continued growth of Appvia’s software engineering capability and technical direction.

Interview Process - 3 Stage

1. Discovery conversation with Talent Acquisition
2. Technical Interview with Engineering Team
3. Final Interview with Leadership

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

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 TypeScript and modern Frontend 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

• Design and deliver modern Java and TypeScript applications in 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

Core technologies:

• Java / Spring Boot
• TypeScript for Frontend
• HTML / CSS / JavaScript
• MongoDB
• Docker / Kubernetes
• Maven
• GitLab

Nice to have:

• Playwright or modern testing frameworks
• GovUK Design System / UI Framework

Why join Appvia?

We are a self-funded, London-based consultancy, growing rapidly while staying true to what got us here: a human, engineering-led culture built on trust, ownership, and getting things done.

As we scale, we’re maturing as a business and expanding into new areas across platform engineering, software, data, and AI. We’re intentional about keeping our culture at the heart of it. We operate with a flat structure, agile ways of working, and a strong focus on collaboration, where good ideas come from anywhere and people are trusted to make an impact.

We work alongside our customers to solve complex, real-world problems: modernising systems, improving delivery, and building scalable platforms that enable long-term success.

If you want to be part of a team that values people as much as technology and gives you the space to grow while working on meaningful challenges, Appvia is the place to do it.

What’s on offer?

⚖️ Work-life balance

• Flexible working hours - because we know life happens outside of work
• Hybrid working - outcomes focused working

• 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.