How a teenage founder built two companies by ignoring conventional wisdom

Executive overview

Most aspiring founders delay starting by accumulating credentials first. Benjamin Döpfner founded his first software company at 15, grew it to $80k/month in revenue, and used the frustration of idle cash earning negative interest to build Vesto — a cash management platform for startups.

Vesto automates treasury management so startups can earn yield on idle cash without needing institutional-scale deposits.

Persistence beats talent: the founders who succeed are the ones who simply refuse to stop.

Starting young and starting fast

• Elaborate pre-startup plans (banking, consulting, MBA) delay learning that only comes from doing
• Starting young means more time to make mistakes and compound them into advantage
• Age triggers funny looks, not real obstacles — investors care about product and traction
• Being young with no safety net forces harder work and sharper persistence

How Vesto was born

• First company accumulated cash sitting idle in a German bank earning negative interest
• Bank's minimum deposit for investing: $100 million
• Gap identified: no accessible, tech-forward cash management tool for small and growing companies
• Vesto automates treasury and money market fund management, sets up in 10 minutes not 10 months

Raising the first round through persistence

• Early investors called the idea horrible and refused to invest
• Sent weekly updates to one investor for six months: new builds, revenue figures, new hires
• Investor eventually committed — not because the model changed, but because of the persistence itself
• Persistence is the one trait that consistently predicts success across all ventures

Building the MVP

• Spent 2-3 years thinking, then 6-12 months building the first version — too long in hindsight
• Standard advice: ship embarrassingly early to get customer feedback fast
• Fintech exception: core financial product must be highly tested; UI bugs are tolerable, financial errors are not
• Early mistake: obsessed over product, ignored distribution and go-to-market entirely
• "Build it and they will come" works at small scale; it fails at scale

Vesto's market position and growth

• Sits between self-serve tools (simple but leave money on the table) and institutional banks (require billions)
• Core customers: Series A to Series C startups; now expanding to pre-seed, PE firms, enterprises
• SVB and First Republic collapse in March 2023 triggered sudden demand — cash safety became a top priority overnight
• Customer funds held in individual custodial brokerage accounts under their own name; Vesto never touches the money
• Registered with the SEC as an investment advisor

Common financial mistakes startups make

• Not looking at finances at all — fragmented tools (banks, payroll, expense software) make reconciliation painful
• Not tracking burn rate or cash on hand as basic hygiene
• Ignoring profitability: zero-interest-rate era normalised burning cash with no path to revenue
• Better to confront a profitability problem early than face it in three to five years

Long-term vision

• Five to fifteen year goal: build a full financial operating system and control centre for companies
• Cash management is the foundation, not the destination
• Motivation is not material wealth — it is building something that lasts hundreds of years