The archive · Small Business & Money · Product decision · 2019
Bootstrapping Calculator: four spreadsheet inputs tell Daniel Vassallo when to quit
A deliberately simple four-parameter spreadsheet converts savings and one guess about income into a target the venture must hit.
Bootstrapping Calculator
What it had to solve
A senior Amazon Web Services engineer with a family, Vassallo's employment contract prevented him from building a business on the side, so the only path to bootstrapping was quitting and living off savings. Before the leap he needed one number he could trust: would the money last until the venture earned its keep, and what income target should he aim for?
How it works
In early 2019 Daniel Vassallo, a senior software engineer at Amazon Web Services, wanted to leave his job and bootstrap a business. His employment contract made side projects impossible, he had a family to support, and the standard question — is my savings buffer big enough? — was exactly the one he could not answer by feel.
His answer was a spreadsheet with four parameters and a strict rule about honesty: the only input that requires guessing is future income. Tweak that one value and the model hands back an income target that the venture must reach to survive. In the launch thread he explained the design: 'It is intentionally simplistic (complex plans are useless). There are only 4 parameters, and the only uncertain one is the income.'
He published the tool free on GitHub under an MIT license and posted it to Hacker News in March 2019. The discussion grew to 112 comments, mixing practical suggestions with a broader argument about whether quitting a job is ever the right move: some readers pushed side-project-first alternatives, while others pointed out that a full-time job can make building on the side legally precarious. Vassallo answered directly, describing his own risk calculus.
The calculator stayed up as a public artifact of the bootstrapping movement. The repository snapshot shows 514 stars, 20 forks and a README that still links to his essays 'Only intrinsic motivation lasts' and 'From employee to bootstrapper', turning a personal spreadsheet into a reusable decision tool for other founders facing the same question.
Why it lands
- Four parameters and one guess force the decision out of the emotional realm: nothing in the model can be quietly fudged except income, which the founder controls by aiming.
- An income target is actionable in a way a probability forecast is not — meet the number and the venture survives, which is precisely the assurance he said the sheet gave him.
- Publishing the spreadsheet invited criticism that improved it; the launch thread became a debate about quitting, side projects and 'mistake runway', not a one-way announcement.
- The MIT license and free download made the tool reusable: 514 stars and 20 forks turned one person's decision aid into a reference others could copy and adapt.
- He paired the model with an explicit exit plan — re-entering the workforce within months was the worst case — which is what made the leap feel reversible rather than reckless.
What it did
The launch post drew 167 points and 112 comments, with the author answering questions about family risk, savings runway and re-entering the workforce, and commenters debating whether quitting was even necessary. The repository snapshot shows 514 stars and 20 forks, and the README still links to the essays he wrote about taking the leap.
What you can take
A scary financial decision becomes manageable when the model has one uncertain input: complex plans are useless, and a target income is easier to aim at than a vague hope.
Since then
The March 2019 Hacker News thread became a reference discussion for the quit-your-job question: Vassallo told readers he was doing it with a family, that the worst case was going back to work, and that he was confident he could find a job within six months if the venture failed. The repository remained live as a free MIT-licensed tool; the crawl snapshot shows 514 stars, 14 watchers and 20 forks, and its README still points new visitors to the essays he wrote about living off savings while bootstrapping.
Sources
- dvassallo/bootstrapping-calculator — Do you have enough savings to fund your business?
- Bootstrapping Calculator: Do you have enough savings to fund your business? (Hacker News discussion)
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