Head of Engineering

Who you are

• A proven engineering leader: you've led engineering teams before, or you're a strong lead ready to step up. You'll be our senior-most technical person as we scale through Series B
• Startup experience: you've built at early-stage startups (Series A to Series C) and know what shipping at that pace and stage actually takes
• Domain experience: you've worked in energy/optimisation or fintech; you'll be working across both
• Hands-on builder and architect: you write production code today, design systems, and make trade-offs beyond individual features, and have done so in early-stage environments. You know when to hack and when to invest
• A culture setter: you set the bar on output and intensity and hold people to it. Engineers who've worked with you got better because you were there. You've hired exceptional people before
• Genuinely AI-native: you use AI daily in your own workflow and in what you build on the side; shipping AI features in a previous role is a plus. You have a clear point of view on where AI creates real leverage
• Knowledge of our stack or appetite to learn: Python for AI/data science; TypeScript, React/Next.js, Node.js, Postgres and AWS across the rest.

What the job involves

• Lead and transform the engineering team: raise the bar on output and pace, mentor and unblock the team - our default is leverage over headcount: make the engineers we have faster before adding more. Own hiring where required as we scale toward Series B
• Engineering strategy and architecture: define and own the multi-year technical strategy and architecture across solar, batteries, EVs, energy supply, the optimisation/dispatch layer and AI. You'll decide what we build, what we buy, and what we hire for, including bringing in deep specialist talent where the problem demands it
• Output focussed: stay close to the work. Write production code, shape architecture, lead by building. Where you spend your time is your call, judged on what you deliver
• Own the AI platform: the context layer that makes Sunsave readable by AI, the harness employees run agents through, and the eval and autonomy bar agents must clear in a regulated business. Lead the AI builders who deploy into departments
• Represent Engineering: at the leadership table, with investors, and cross-functionally with Product on where we trade off speed, quality, and long-term value

The application process

• Stage 1: Intro and initial CV review (~30 mins)
• Stage 2: Technical test, shared in advance (~1 hour)
• Stage 3: Architecture session (~45 mins)
• Stage 4: Culture and fit (~1 hour)
• Stage 5: Leadership team (~1 hour)
• References

Benefits

• Private health insurance (incl. dependents under 18)
• Mental health support
• Monthly wellness budget (Juno)
• Enhanced maternity and paternity leave
• Team social events (remote & live)
• 25 days holiday (excl. bank holidays)
• Fortnightly company social events
• Quarterly team social outing
• Quarterly women's dinner/social
• Remote working home office budget
• Cycle to work scheme