Senior Software Engineer at UnlikelyAI

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Senior Software Engineer Salary Not Disclosed Company Description UnlikelyAI is a London-based Series A startup founded by the creator of Amazon Alexa, pioneering neurosymbolic technology that combines LLMs with deterministic symbolic reasoning. Job Description Join a high-caliber team of 40 as we transition from bespoke enterprise solutions to a scalable AI platform. You will build core capabilities at the intersection of symbolic AI and modern LLMs, developing high-performance Python systems that deliver reliable, explainable outcomes for top-tier financial institutions and global accounting firms. Location London, UK Why this role is remarkable Work on a genuinely novel tech stack combining the probabilistic power of LLMs with proprietary deterministic symbolic guardrails to solve AI reliability. Join a prestigious team founded by William Tunstall-Pedoe (creator of Evi/Alexa) and staffed by elite engineers from Google, Amazon, and Imperial College. Play a pivotal role in the company's evolution as you architect and launch the public API and platform that will scale their technology globally. What You Will Do Design and implement core neurosymbolic infrastructure, including decision trees, propositional graphs, and knowledge graphs, within a collaborative Python monorepo. Architect the public API and developer experience, ensuring high scalability, robust authentication, and seamless document ingestion for enterprise-grade compliance tools. Develop advanced evaluation frameworks and feedback loops to benchmark and continuously improve system accuracy and performance against regulatory requirements. The ideal candidate Exceptional Python engineering skills with a track record of building well-tested, production-quality code and advocating for high standards in a monorepo environment. Deep expertise in complex algorithms and data structures, specifically applied to non-trivial problems like symbolic reasoning or knowledge representation. Experience leading end-to-end software ownership, from ideation to production, ideally within high-growth startups or complex regulated industries like fintech and audit. Who are Jack & Jill? Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support. And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate. How does this work? Jack's an AI agent for job searching and career coaching. He works for you. Jill is the AI recruiter working for the company. She recruits from Jack's network. If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.