Founding Software Engineer

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 Software Engineer Salary Not Disclosed Company Description Squid is a Y Combinator-backed (W26) London startup building an agentic modelling platform for power grids, tackling the primary bottleneck in the energy transition. Job Description As a founding engineer at Squid, you will build production software for grid operators, bridging the gap between power systems and AI. You will develop tools for validating complex network models and creating human-in-the-loop systems. This high-ownership role involves shaping the technical architecture and engineering culture while solving critical national-scale infrastructure challenges. Location London, UK Why this role is remarkable Join as a founding engineer at a YC W26 startup solving the multi-trillion dollar bottleneck of grid electrification and infrastructure planning.Work alongside founders with elite pedigree from National Grid, Octopus Energy, and AWS, backed by premier venture capital investors.Directly influence the product and technical architecture while partnering with industry leaders including National Grid and Northern Powergrid. What You Will Do Build and ship production-ready software across the full stack, including backend services, frontend interfaces, and cloud infrastructure.Develop sophisticated tools for loading, visualising, and explaining complex power system models and datasets for grid planners and operators.Design and evaluate AI agents and human-in-the-loop systems that assist engineers in critical grid planning and scenario analysis. The ideal candidate Professional software engineering experience building production systems using technologies like Python, TypeScript, React, Postgres, or cloud data pipelines.A background or strong motivation to go deep into power systems, electrical engineering, or grid modelling tools like pandapower or PowerFactory.High-ownership mindset with the ability to translate ambiguous, real-world engineering problems into reliable, usable, and performant software solutions. 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.