Founders spend weeks debating frameworks before writing a single line of code, and most of that debate doesn't matter. How to choose a tech stack for a startup is less about picking the "best" technology and more about picking the one that gets you to a working product fastest.
The actual priorities in how to choose a tech stack for a startup
Speed to launch matters more early on than theoretical scalability you won't need for years. How to choose a tech stack for a startup should weigh what you and your team already know how to build with, since learning a new framework while also trying to validate a business idea slows both down at once.
Why popularity isn't the deciding factor
A stack being popular doesn't mean it's right for your specific product. How to choose a tech stack for a startup depends on what the product actually needs to do: a data-heavy application has different requirements than a simple booking tool, and copying whatever stack a well known company uses ignores that your constraints are completely different from theirs.
What actually matters for most early-stage products
Python with a framework like Flask covers a huge range of startup needs: fast to build, well documented, and flexible enough to handle most early product requirements without over-engineering. How to choose a tech stack for a startup at this stage means picking something proven and boring over something exciting and unproven.
When to revisit the decision
The stack that gets you to your first hundred customers doesn't have to be the stack you're still running at ten thousand.
How to choose a tech stack for a startup is a decision you're allowed to revisit once you have real usage data telling you where the actual bottlenecks are, instead of guessing at the start.