Senior Software Engineer (£80k–£100k + Equity) at Humaans

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 (Full Stack) Salary £80k–£100k + Equity Company Description Humaans is a $20M venture-backed London startup building the next-generation AI-powered infrastructure for the global workplace. Backed by Y Combinator and the founders of Slack, Figma, and Shopify, the company is redefining people operations with an agentic AI layer that automates workflows across HR, IT, Finance, and Operations. Job Description Join Humaans as a Senior Full Stack Engineer to build "Athena," an agentic AI layer automating people operations. Working directly with the founders in London, you will own features from ideation to launch across a modern TypeScript stack. Help us redefine how fast-growing companies like Poolside and Quantexa manage complex global workflows. Location London, UK Why this role is remarkable Work on a highly differentiated AI platform that uses a structured workforce data model to make automation reliable for HR, IT, and Finance. Join a company backed by $20M from elite investors, including Y Combinator and the founders of Slack, Figma, and Shopify, in a category that is currently wide open. Enjoy a high-autonomy product culture where engineers influence the roadmap, collaborate with designers, and solve complex orchestration problems for high-growth global teams. What You Will Do Build and ship end-to-end features using TypeScript, React, and Node.js while contributing to technical architecture and infrastructure on Kubernetes. Collaborate directly with the CEO and Head of Engineering to shape product definition, discover customer needs, and expand the third-party integration marketplace. Own the full software lifecycle, from scoping and technical planning to implementation, bug fixes, and supporting sales/marketing efforts. The ideal candidate Extensive professional experience building full-stack web applications, ideally within a high-growth SaaS environment, with a deep appreciation for digital craftsmanship. Expert-level proficiency in TypeScript and Node.js, with the ability to navigate complex backend systems and frontend React components with ease. Proven track record of taking ownership of ambiguous problems and collaborating effectively with product teams to deliver tangible value to end-users. 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.