The global fintech sector is projected to surpass $1.5 trillion in market value by 2030, according to Boston Consulting Group. Billions of dollars flow toward engineers, product designers, and growth marketers. Very little attention goes to the person keeping the whole operation from falling apart. At most startups, that person does not even have a clear job title. At Sumvin, a fintech startup building the only B2C permission layer for agent-driven finance. They are called the Chief of Staff. And Matthew Doll runs it with less visibility than the role probably deserves.
The Role Nobody Defines the Same Way Twice
Ask ten Chiefs of Staff what they do, and you will receive ten different answers. That is the defining feature of the role. The Chief of Staff sits at the edge of every function, close enough to lead when needed and removed enough to see the full picture. In large corporations, the role typically involves executive support and strategic coordination. In a ten-person startup, it means something closer to running the entire company.
Doll leads operations, finance, legal & compliance, HR, IT, vendor relationships, and office management at Sumvin simultaneously. External accountants and legal counsel handle work requiring certification. Everything else falls to him.
The Chief of Staff title carries different meanings across different organizations, and that ambiguity has made it one of the most poorly understood positions in the technology industry. The Chief of Staff function at startups has grown significantly in prominence as founders recognize that operational breakdown, rather than product failure, is among the most common causes of early-stage company collapse. Where a founder’s associate typically operates as a generalist support function, executing tasks and handling overflow from the founding team, the Chief of Staff sits a level above that, owning entire functions independently, and bringing the kind of cross-functional experience that allows them to anticipate problems rather than simply respond to them.
What the role demands at this stage is a combination that’s hard to find in one person. The person filling it needs to be able to build financial and legal systems without hand-holding, advise founders credibly on strategy, and stand up operational processes from nothing while everything else is moving. Most people’s careers develop one or two of those muscles. It’s unusual to find someone who’s built all of them.
“If something needs doing and no one else owns it, it’s mine. That’s basically the job description.,” Doll says. “That sounds overwhelming until you realize it’s actually the most complete view of a business you can have.“
An Unusual Route In
Doll’s route to this position ran through a first-class MChem in Chemistry at the University of Oxford, where his masters’ research produced two published academic papers. His A-level record, top grades across Chemistry, Physics, Mathematics, and Further Mathematics, established a pattern of performance under rigour that his professional career has continued without interruption. Graduate-level scientific training at that standard produces something that translates directly into operational leadership, a discipline for working through problems with a lot of moving parts and not enough information, which is most of what early-stage operations actually involves
After graduation, he moved through a sequence of roles that, individually, would look like a winding path and, collectively, read as intentional building. A project management role at Prysmian, a world-leading cable manufacturer, where he served as project managed the implemention of the 6S operational framework across his section of the factory. A consulting internship at Simon Kucher, a global strategy consultancy. A graduate role at ION, one of fintech’s most established enterprise software firms, where he led a the strategy on a complete overhaul of an existing enterprise software product and built the business case that secured a multi-million-dollar go-ahead decision. “You learn quickly in those environments that the quality of your thinking has a direct dollar value,” he says. “There’s no place to hide.“
During his ION tenure, Doll simultaneously held a founder’s associate role at Sibylline Labs, a startup venture studio, working evenings and weekends across both positions. A serious accident that left him in a coma and temporarily unable to walk delayed his ION start date by three months. He joined as planned once he had recovered and each role covered ground the previous one hadn’t, and the pattern across his career is consistent: he takes on whatever needs doing and figures it out.
The Broader Argument
The technology industry has spent years optimizing for technical talent while treating operational leadership as a secondary concern. The agentic AI for financial services market is projected to reach $80.9 billion by 2034, expanding at a compound annual growth rate of 43.8%. Building companies at that frontier requires professionals who can operate with the same speed and precision the technology demands, across every function simultaneously, without the scaffolding that larger organisations provide.
The career path that produces someone like Doll doesn’t follow a straight line, but each stage of it left him with something the next one needed. That’s harder to plan than it looks, and harder to find than most founders realise.
“The early career path that looks messy from the outside is often the one that builds the most complete operator,” he says. “Every role I had, including the ones that didn’t work out, gave me something I use now. None of it was wasted.“
