Senior Software Engineer Lead in London

About Us

At UnlikelyAI, we are building the future of AI: one that is reliable, explainable, and resistant to hallucination. Our patented neurosymbolic platform combines the expressive power of LLMs with the transparency and control of symbolic reasoning. This enables us to create AI systems that are accurate, auditable, and suitable for high-trust, high-stakes applications – where precision, traceability, and compliance are essential.

The Role

We're looking for a Senior Software Engineer to be the Tech Lead for Uncheck, our accounting disclosure product, and lead its planning and delivery as it scales across customers and markets. You'll own the technical plan and sequencing, working with product and customers, and make sure it is delivered well and on time, while staying hands-on in the code.

Uncheck automates the checking of accounting disclosures. It reviews financial statements against the accounting standards and regulations that apply to them, and shows the evidence behind each finding. It is live in production at enterprise scale, and we are expanding it into new regions and markets.

This role is ideal for someone who enjoys leading the delivery of software as much as building it, and takes pride in delivering what has been promised. You'll work on planning and building a product that customers rely on for regulatory decisions, writing code alongside an experienced engineering team, and collaborate with product and research colleagues.

Pioneering AI is one of our leadership principles. In every role we make AI our starting point for rethinking how work gets done, and you'll lead that for the Uncheck engineering team. This is a hands-on position with real impact, offering the chance to shape Uncheck through its next stage of growth.

What You'll Do

• Own the technical plan for Uncheck and lead delivery against the commitments we make to customers.
• Build software as a hands-on member of the team, writing production code and reviewing others' work.
• Make technical decisions together with the team, aligning with senior engineering and leadership.
• Lead how the team builds with AI agents, including how agent-written code is reviewed, tested and shipped safely, and measure what it does for delivery.
• Make sure Uncheck runs reliably and securely in the cloud as it scales to new customers and regions.
• Lead technical conversations with customers' IT, security and architecture teams, from first evaluation through to live use.
• Work with product and research colleagues to turn new capabilities and customer feedback into clear priorities.
• Mentor engineers across the team.

You'll be successful here if...

• ...you already work AI-first. Agents write a large share of your code, and you have firm views on how a team should review and test that work, because customers rely on what we ship for regulatory decisions.
• ...you have led delivery for a team of 4 to 8 engineers, shipping to enterprise customers on time and to a high standard.
• ...you have mentored engineers and helped them grow.
• ...you communicate clearly with customers and non-engineers, and are comfortable leading technical conversations with enterprise teams.
• ...you have strong back-end experience in any language, including agent-written code, and able to make sound technical decisions.
• ...you have owned production cloud services, ideally on AWS, in a team with strong engineering practice: code review, automated testing, CI/CD and on-call.
• ...you understand what enterprise security and compliance teams expect.

Other skills

You don't need all of these, but any of them would strengthen your application:

• Experience shipping AI-powered products or features to customers, and making their output reliable at scale.
• Experience with Python, which our back end is written in.
• Experience in a regulated industry, such as financial or professional services, legal, insurance or healthcare.
• Experience taking a product into new regions.
• DevOps, infrastructure and SRE experience, such as infrastructure as code, CI/CD pipelines and observability.

What's in it for You

Joining UnlikelyAI means working on technology that pushes boundaries while shaping your career:

• Work on a hard and worthwhile problem: making AI output reliable enough for regulatory decisions.
• Have a real say in how we plan and deliver, in a team of around 40 where decisions are made quickly and together.
• Work alongside researchers developing new approaches to trustworthy AI.
• Help take a live product into new regions and markets.

Working at UnlikelyAI

We offer a range of benefits and perks designed to support our team's wellbeing and work-life balance:

• A hybrid working policy, with three days a week as the expectation at our Central London office.
• Office in Bloomsbury, five minutes from Tottenham Court Road and Holborn stations.
• Free team lunches every Monday, Tuesday, Wednesday and Thursday.
• Optional social and extra-curricular activities throughout the year.
• Share options, so you own part of what you help build.
• Private health insurance with Bupa.
• Juno rewards, earning points on everyday purchases.

Equal Opportunities

We are committed to having a truly diverse team where everyone is encouraged to be their authentic selves. We do not discriminate in employment based on gender, race, religion, sexual orientation, national origin, political affiliation, disability, age, marital status, medical history, parental status or genetic information. Having a broad mix of people helps us to be the best we can. If there is anything we can do to make the recruitment process more accessible or comfortable for you, please let us know.