Chief of Staff

Job description

What we are building at Sitemark Sitemark is the AI and robotics platform for building and operating renewable energy. The world's leading Owners, EPCs, and O&M companies use Sitemark to build and operate their sites faster. What problem are we solving and why is this important to solve The world is building one of the largest infrastructure shifts in history — and it needs better tools to get it done. Renewable energy projects are growing in scale, complexity, and urgency, but the teams responsible for building and operating them are stretched thin — buried in repetitive work, disconnected systems, and running out of time. That's why we built Sitemark: AI and robotics take the repetitive load off these teams, from the field to the office, so their time goes to what matters — and sites get built faster and perform better. The team you'll join You will join an extremely talented team of incredibly passionate, high-energy people. We go the extra mile while having the best time of our lives. How we operate We care deeply about our customers and the problems we solve for them. We move fast, keep things simple, and focus on what matters. We keep our quality bar high by staying lean and hiring only the best. Tasks As Chief of Staff, you are the leadership team's force multiplier — the person who takes the hardest, highest-stakes problems off their plate and drives them to done. Sitemark is a fast-growing scale-up going global: we're going from 60 to 200 people over the next two to three years, and how well we navigate that depends on getting a lot of hard things right at once. You've helped scale a company through this exact stage before — you know what breaks between 50 and 200 people, and you've built the muscle that holds a company together as it grows. You'll work directly with the leadership team, founders included, and get your hands into projects across the entire company. The scope is deliberately, almost unusually broad — finance, strategy, operations, people, processes, international expansion — wherever the most important problem of the moment lives. This is a hands-on role for an experienced operator: you bring the judgment of someone who's done it before, and you roll up your sleeves and execute yourself. What you'll do Own end-to-end the high-value, cross-departmental projects the leadership team cares about most — from messy problem to shipped outcome. Build the operational backbone of a company tripling in size: spot what's starting to break as we grow and put in the systems and ways of working that fix it — so we scale fast without scaling headcount or losing our quality bar. Keep the company on track: help run planning, set and track the goals and KPIs that matter, and pull together the analysis behind leadership meetings, all-hands, and board updates. Act as a trusted advisor and sounding board to the leadership team — pressure-testing decisions, surfacing what they're missing, and turning ambiguity into a clear plan. Drive alignment across teams: connect leadership's priorities to what each department is actually doing, kill low-value work, and unblock the projects that matter. Go deep fast on unfamiliar problems — why a key metric is dropping, how to fix a process that's breaking as we grow — build the analysis, bring a recommendation, and implement the solution. Step in wherever the gaps are. The brief changes constantly, and you fill whatever role the moment needs. What success looks like after 6–12 months: You understand how every department works inside out The leadership team routes its hardest cross-functional problems to you by default and trusts your judgment on them. Systems and processes you've put in place are holding as the company grows, and recurring bottlenecks you've removed don't come back. Requirements Proven experience scaling a company from roughly 60 to 200+ people — ideally at a startup or scale-up — and a real feel for what breaks at each stage and how to fix it before it does. Hands-on operating experience across HR, finance, strategy, and operations — you've actually built and run these functions, not just managed the people who do. You can set up an entity, fix a broken hiring process, build a budget, and stand up the systems a growing company needs. A strategic executor, not a manager. You turn ambiguous problems into a clear plan and personally drive them to done. A track record of structuring messy, cross-functional problems and shipping results without a playbook handed to you. Exceptional communication — you can write a crisp memo, run a leadership meeting, and hold your own with the leadership team and founders. Genuinely high standards and high ownership — you'd rather do it excellently and lean than adequately and bloated. This is not a nine-to-five. It's hard, it's tough problems, and it'll push you well outside your comfort zone repeatedly. You should want that. We work primarily onsite from our Leuven HQ office and value in-person collaboration. This role requires being in our office at least 2 days per week. Benefits A rare chance to work directly with leadership and founders of a fast-scaling company Get involved in projects across the entire company, and build the systems that carry us from 60 to 200+ people. Collaborate with a high-energy team that is obsessed with excellence and execution. Work on a mission that matters: accelerating the world's transition to renewable energy. Competitive compensation including meaningful equity (stock options) with real upside.