Chief of Staff

At Hadean, we are building the next generation of defense technology. As a key player in the UK’s defense tech ecosystem, our world-leading software is trusted by defense organizations and militaries worldwide. We specialize in AI-powered digital wargaming and Command & Control systems that help users understand complexity, make better decisions, and operate at scale. Joining Hadean means working on technology with real-world impact, alongside a team that is driven to push the limits of what’s possible. The Role: We are hiring a Chief of Staff to work closely with senior leadership, supporting the execution of key priorities across the business. This is a broad, high-impact role that sits across teams and functions. You will take ownership of projects that do not clearly sit within one team, helping to drive progress on strategic initiatives and remove friction as the company scales. You will partner closely with the leadership team to translate priorities into action. This includes identifying where the business needs focus, stepping in to support delivery when needed, and ensuring work moves forward with clarity and accountability. A key part of the role is improving how the company operates. You will help shape internal processes, support planning cycles, and ensure teams are aligned around shared goals. You will also play a role in strengthening leadership effectiveness by improving communication, coordination, and decision-making across the business. This role is suited to someone who is comfortable moving between strategy and execution, and who takes pride in raising the standard of whatever they work on. About You: An “expert generalist” who can move across different domains, get up to speed quickly, and add value without needing to be the deepest specialist in the room. Curious, adaptable, and with a high bar for your own work. Comfortable working across different functions, switching context quickly, and bringing structure to ambiguous problems. Someone who takes ownership and follows through. Equally comfortable shaping a plan as executing it, with a strong focus on the quality of the outcome. Able to build trust with senior stakeholders through sound judgment, clear communication and a consistent focus on what matters. A track record of taking on responsibility early and operating with a level of ownership that goes beyond your role. Key Responsibilities: Own and drive cross-functional projects from idea through to execution Support the CEO and leadership team on strategic priorities and planning Turn high-level goals into clear plans, milestones, and accountability Step into teams when needed to support delivery on priority initiatives Improve internal processes and operating rhythms (e.g. planning cycles, OKRs, leadership meetings) Support board preparation, investor updates, and key communications Improve coordination and information flow across teams Identify inefficiencies and implement practical solutions Skills required: Experience working in a fast-paced, high-growth environment Strong problem-solving and analytical skills Able to manage multiple projects and priorities simultaneously Comfortable working across teams and functions Clear and effective communication, both written and verbal High level of ownership and attention to detail Able to handle sensitive information with discretion Job Benefits We make Hadean an awesome place to work with competitive benefits… Health insurance 401k Flexible working 3 extra days off at Christmas (on top of our standard 20) L&D budget Business reviews with team dinners and events Share options A Place For Everyone We believe diversity drives innovation and for that reason we strongly encourage those from all backgrounds to apply for roles at Hadean. We are an equal opportunity employer and aim to build a workforce that is truly representative of the communities in which we operate and our clients. If you need reasonable adjustments at any point in the application or inte