Senior Full Stack Developer

Appvia; Greater London; Hybrid; GBP 70,000 - 85,000; Full time

Benefits offered by this job

10% Bonus

10% Equity

Benefits

Job summary

Appvia is looking for Senior Full Stack Engineers (Java/TypeScript) to join a growing software engineering practice in London. This hands-on, client-facing role involves designing and delivering modern software in complex environments, working on what is effectively a greenfield build within a brownfield ecosystem.

You will report into a Principal Software Engineer, helping raise Appvia's technical direction and capabilities while shaping architecture, tooling, and standards for long-term

Qualifications

• Strong experience with TypeScript and modern Frontend development.
• Strong backend experience with Java (Spring Boot).
• 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 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.

Skills

TypeScript frontend

Java Spring Boot

DDD

microservices

full‑stack

cloud AWS

AI‑assisted development

stakeholder guidance

Tools

Docker/Kubernetes

Maven

GitLab

Job description

What's on offer?

Internal Title: Senior Full Stack Developer

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

Contract: Permanent, Full-time

Package (perm): £70,000 - £85,000 + 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'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

• Discovery conversation with Talent Acquisition
• Technical Interview with Engineering Team
• Final Interview with Leadership

Important - for Permanent applications

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 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

Responsibilities

• 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

Technical Skills

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

Benefits

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.

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.