Staff Full Stack Engineer - Buy-Side Growth

Job description

📈 Who We Are: We are rebuilding the energy transaction, making it transparent and fair. We're rebuilding how energy is bought and sold. That means cutting out middlemen, connecting businesses directly with renewable generators, and ensuring every transaction is traceable and transparent. We're a 160+ person team - operators, data scientists, engineers, customer champions and energy experts - backed by top-tier investors including Lightspeed Venture Partners, Hitachi Ventures, Allianz, AlbionVC and Atomico. We closed a $75M Series B round in early 2026, taking our total funding to $94M, and we now power energy for over 4,000 UK businesses across 8,500+ sites, with over £75m in value returned to businesses and generators so far. We're a technology company solving the energy industry, not an energy company. Some people call us a neo-utility, the neo-bank idea, applied to energy. The industry is noticing. We were crowned Europe's Most Exciting Tech Company at the GP Bullhound Allstars awards https://www.gpbullhound.com/articles/allstars-awards-2026-winners-announced/, came in at #6 on LinkedIn's Top Startups 2026 https://www.linkedin.com/pulse/linkedin-top-startups-2026-20-uk-companies-rise-linkedin-news-uk-xoffc in the UK, #7 on the Scaling Europe 50 https://scalingeurope.co.uk/ of Europe's fastest-growing companies, and #14 on Sifted's AI 100 https://lnkd.in/p/ehxWgJyc. Learn more about us on our website https://www.tem.energy/. 🏅 THE ROLE: We're hiring a Staff Full Stack Engineer to act as embedded technical leader for one of Buy-Side Growth's engineering squads. Buy-Side is organised into four dedicated squads, each built around a single technical leader: Self-Driving Tendering, Price Everywhere, Broker Self-Serve, and Customer Autopilot, supported by a cross-squad Architect who owns the Buy Engine and tendering service. Two of those squads - Broker Self-Serve and Customer Autopilot - don't yet have a technical leader in place, which is the clearest gap in the team today. This role exists to close that gap: to be the person a squad looks to for architecture calls, technical direction, and the judgement to pick the right bets, without needing to be a people manager to do it. The bigger picture: Buy-Side's vision is an engine that increasingly runs itself - agents handling tendering, pricing, and customer experience end to end, so the team can serve many more brokers and customers without headcount scaling in step. You'll be building directly toward that, on a team that already ships in dedicated, focused squads rather than one team context-switching across everything. In your first 12 months, you might: - Step in as the embedded technical leader for a squad - most likely Broker Self-Serve or Customer Autopilot, both currently short a technical lead. - Take Customer Autopilot from pre-discovery to a shipped first version, setting its technical direction from scratch. - Extend the multi-broker tendering work that Self-Driving Tendering has already shipped, or push further into Price Everywhere, currently the team's biggest strategic bet. - Mentor the engineers around you, raising the technical bar for your squad through code review, architecture proposals, and the credibility of your own delivery. - Help design the agentic workflows that let Buy-Side handle dramatically more tenders and customers per person than it can today. 🚀 RESPONSIBILITIES: - Build with impact: Architect and deliver end-to-end systems, from internal automation to broker- and customer-facing portals, ensuring they are scalable, fast, and user-friendly. - Lead the technical direction: Propose and own the technical direction for your squad, picking the right architectural bets and building the credibility to get others to act on your recommendations. - Own the platform: Improve and extend core platforms and tooling, making it easier for your squad and others to build, test, and ship quality software. - Drive innovation: Rapidly prototype and iterate on new workflows and product ideas that expand our offering and improve the broker and customer journey. - Raise the bar: Mentor other engineers and teach your domain through code reviews and hands-on collaboration, without needing a formal management line to do it. 🎯 REQUIREMENTS: Must-Haves: - Strong technical leadership: a track record of setting technical direction for a team or project, and getting others to commit to it through the credibility of your work, not through a management title. - Track record in fast-paced environments: experience as a Senior or Staff Engineer in a high-growth startup or scale-up, with a strong bias toward shipping. - System design at scale: proven ability to design and build complex systems that power both back-end automation and front-end experiences. - Modern tech expertise: it's preferred that someone has deep experience with Python (FastAPI) and modern JavaScript/TypeScript frameworks such as React, however