Senior Full Stack Engineer in London

This role will close on the 31st August at 23:59 UK Time.

About the job

The Incubator for AI (i.AI) builds AI products inside the UK government that change how public services work across education, health, planning, and parliament. Small teams, startup pace, national-scale impact. We are based in London, Bristol and Manchester, with hybrid working. Full Stack Engineers build the products and services that bring AI capabilities to users: interfaces, APIs, data layers, infrastructure and delivery pipelines that make AI safe, reliable and useful for citizens and civil servants. Our stack includes Python (Django, FastAPI), TypeScript, modern JS frameworks (React, Astro, Svelte), PostgreSQL, AWS and Terraform. We integrate frontier LLMs through providers such as Amazon Bedrock, and the AI-integration landscape evolves as the ecosystem matures.

Job summary

We build a portfolio of AI products at different stages of maturity, from early discovery through to services running at scale. You will be part of a small cross-disciplinary team working on one of these products, owning problems end-to-end and shipping real improvements for users. Over time you may move between products as priorities shift, giving you breadth across different problem domains and technologies. We’re looking for engineers who care as much about understanding the problem as writing the code, and who thrive when working closely with people from different disciplines.

Job description

What you'll do:

• Work with your team to develop a deep understanding of the problem space, participating in discovery, interrogating assumptions, and aligning on what success looks like.
• Shape technical approaches collaboratively, weighing trade-offs with designers, product managers and other engineers to arrive at solutions that work for users and the team.
• Deliver working software across the full stack, from infrastructure and data layers through to APIs and user interfaces, in small, frequent increments.
• Communicate openly by sharing progress, surfacing risks early, and documenting decisions so the team can move confidently.
• Maintain high standards through automated testing, code review, and operational practices that keep services reliable.
• Mentor and support other engineers through pairing, knowledge sharing, and constructive feedback.
• Get stuck in beyond building features, whether that's participating in user research, supporting a live service, or picking up unfamiliar work to keep the team moving.

Who you are:

• Strong experience building and maintaining production services across the stack, with depth in at least one backend language and one frontend framework.
• A collaborative mindset. You believe the best outcomes come from people with different skills and backgrounds solving problems together, and you actively invest in that.
• Experience shaping technical direction in ambiguous environments. You’re comfortable making decisions with incomplete information and revisiting them as you learn more.
• Clear, proactive communication. You naturally keep people around you informed and bring others into decisions.
• A commitment to quality through automated testing, code review, and thoughtful engineering practices.

You don't need to meet every criterion to apply. If this role excites you, we'd love to hear from you.

What we offer:

• Career-defining projects with outsized impact.
• Backing from the Prime Minister and No10 to scope and build transformative AI products.
• Unique opportunities to apply technology to transform the public sector and citizens' lives.
• Talented, supportive and mission-driven colleagues.
• Access to frontier models and ample compute. Work with experts across national security, policy, AI research and adjacent sciences.
• A team culture and development support that prioritises personal growth. Opportunities to own important products early and develop them in small empowered teams.
• 5 days of learning and development, annual stipends for learning and development and funding for conferences and external collaborations.
• Opportunity to work from London, Manchester or Bristol offices. Hybrid working, flexibility for occasional remote work abroad and stipends for work-from-home equipment.
• Generous annual leave - 25 days plus one additional day for each year of service.
• Generous paid parental leave (up to 39 weeks full pay + option for additional unpaid time).
• On top of your salary, we contribute 28.97% of your base salary to your pension.
• Discounts and benefits for cycling to work, dental insurance, donations and retail/gyms.

Salary: £64,450–£88,670. Salary is dependent on location and skills assessed at interview. This is comprised of a Grade 7 base salary of £61,620–£68,570 for London or £56,850–£63,980 for national, plus a non-pensionable technical allowance of £7,600–£20,100. Alongside a salary of £64,450–£88,670, we contribute 28.97% of your base salary to your pension.

Selection Process:

Appointment is conditional on successfully completing UK Government SC clearance. Prior clearance is not required—we will sponsor and support you. You should normally have been resident in the UK for 2 of the past 5 years. Employment is conditional on obtaining and maintaining the required clearance(s). More detail on clearance eligibility can be found on the UK Government website: National security vetting: clearance levels - GOV.UK.

In accordance with the Civil Service Commission rules, the following list contains all elements of the selection process. To apply please upload your CV and answer any required questions. There is no need to upload a separate cover letter. Candidates should expect to go through some or all of the following stages once an application has been submitted:

• A short initial conversation.
• Technical take home test.
• Second interview in which we’ll review the technical test.
• Third interview with wider representation from the team.
• Final interview with members of the senior team.

Diversity and Inclusion:

The Civil Service is committed to attract, retain and invest in talent wherever it is found. To learn more please see the Civil Service People Plan and the Civil Service Diversity and Inclusion Strategy. As part of the application process, we monitor statistics on D&I.