Senior Full-Stack Engineer — AI & GovTech (Hybrid/Remote)

Addition; Greater London; Hybrid; GBP 70,000 - 95,000; Full time

Benefits offered by this job

Annual bonus

Birthday off

Hybrid work: Shoreditch office

£1,000 learning & development budget

Remote work up to 4 weeks/year

High-spec Windows or MacBook

Meaningful AI projects in UK govt

Autonomy & diverse tech challenges

Job summary

Addition is seeking a senior Full-Stack Developer to design, build and deploy scalable software for UK government projects. You will work across frontend, backend and data pipelines, balancing hands-on engineering with technical leadership.

The role uses Python, TypeScript, SQL with Azure and GCP, Docker and Linux; you’ll mentor engineers, review code, and collaborate with stakeholders while delivering secure, reliable solutions in a hybrid setup with one day per week in Shoreditch.

Qualifications

• Strong commercial experience as a Full-Stack Developer or Software Engineer working on complex applications.
• Advanced Python and TypeScript skills with frameworks such as FastAPI, Pydantic, Node.js, Express or Next.js.
• Strong React experience and confidence building sophisticated, user‑friendly front‑end applications.
• Strong SQL and database experience, including performance optimisation and data integrity.
• Hands‑on knowledge of cloud deployments, ideally Azure or GCP.
• Confident working with Docker and Linux‑based environments.
• Advanced Git knowledge, including branching, merging, pull requests, code reviews and collaborative workflows.
• Experience with CI/CD practices and automated testing.
• Strong stakeholder communication skills, including presenting complex technical concepts clearly.
• Experience mentoring or supporting less experienced engineers.
• Excellent problem‑solving, organisation and attention to detail.

Responsibilities

• Design, build and deploy scalable full‑stack software solutions across front‑end, back‑end and data engineering.
• Develop high‑quality APIs, backend services and complex data pipelines with performance and reliability in mind.
• Work extensively with Python, TypeScript and SQL across a variety of applications and integrations.
• Support the delivery of technology solutions helping public‑sector organisations adopt AI and machine learning effectively.
• Deploy and maintain applications within cloud environments such as Azure and GCP.
• Use Docker and Linux to support reliable application deployments, including containers, storage, volumes and permissions.
• Review code and pull requests, maintaining strong standards around security, testing and maintainability.
• Design and optimise database solutions to protect data integrity and improve application performance.
• Troubleshoot complex technical challenges and continuously improve existing platforms and services.
• Mentor junior engineers and help establish strong engineering practices across the wider team.
• Communicate technical decisions, project progress and outcomes clearly to technical and non‑technical stakeholders.
• Contribute to technical planning, identify potential risks and recommend new technologies or approaches.

Skills

Full-Stack Development

Python

TypeScript

FastAPI

Pydantic

Node.js

Express

Next.js

React

SQL

Database design

Azure

GCP

Docker

Linux

Git

CI/CD

Testing

Code reviews

Security

Stakeholder communication

Mentoring

Problem solving

Tools

Docker

Linux

Azure

GCP

Git

CI/CD

Job description

Addition is seeking a senior Full-Stack Developer to design, build and deploy scalable software for UK government projects. You will work across frontend, backend and data pipelines, balancing hands-on engineering with technical leadership.

The role uses Python, TypeScript, SQL with Azure and GCP, Docker and Linux; you’ll mentor engineers, review code, and collaborate with stakeholders while delivering secure, reliable solutions in a hybrid setup with one day per week in Shoreditch.