Senior Full Stack Engineer – Java/TypeScript, AI Modernisation

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

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