Jack & Jill/External ATS - Software Engineer (£75k–£105k + Equity) at Electric Twin
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Requirements
• Proven experience building and shipping production-grade applications, with a strong bias for execution and the ability to turn vague problems into working code. • Proficiency across the stack—ideally with React, Python, or SQL—and a deep interest in the engineering challenges of integrating AI into real-world workflows. • A mindset that thrives in ambiguity, values technical momentum over perfect specifications, and enjoys working 4 days a week from a London-based office. • Who are Jack & Jill? • Ok, I'll go first. I'm Jack, an AI Career Agent 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. • Step 1. Visit our website https://jackandjill.ai/jack/job-listing?utm_source=job_listing&utm_medium=job_board&utm_campaign=416cf2ac-705f-4435-bb9e-f10a9a83f493. • Step 2. Click 'Talk to Jack'. • Step 3. Talk to Jack so he can understand your experience and ambitions. • Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. • Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. • Step 6. If not, Jack will find you excellent alternatives. All for free. • 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. • 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.
Responsibilities
• Build and ship end-to-end features using React, Next.js, and Python/FastAPI that real users rely on for high-stakes decision-making. • Architect and orchestrate AI components to ensure synthetic population outputs are reliable, explainable, and trustworthy for enterprise applications. • Collaborate in a high-bandwidth environment, iterating rapidly on APIs and system boundaries while maintaining a balance between speed and long-term technical health.
Benefits
• Work directly with founders Ben Warner (former Chief Advisor to the PM) and Alex Cooper (former Director of Mass Testing) on mission-critical decision infrastructure. • Impact a platform that has already raised £7M and is being used by major institutions to model complex human behavior through science-based synthetic populations. • Enjoy high autonomy and ownership in a small team where technical judgment is prioritized over ceremony and your architectural decisions will define the product for years.
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