What’s the first technical decision you lock in when starting a new SaaS product?
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For me, I feel like the hardest part isn't choosing between tools like React, Firebase, Railway, etc, it's really deciding which parts of the stack I should commit most of my time and tokens early and which ones may become painful to replace later.
Do you stick with a familiar stack and avoid overthinking it, design around expected scale from day one, let your coding agent influence the architecture, or start with the cheapest setup and migrate later? Also, curious which early technical choice has saved you the most time, and which one you wish you probably shouldn't have overthinked on.
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The first thing I lock in is not a tool, it is which decisions are expensive to reverse, and I only spend real time on those. The data model, and anything that touches how money or auth flows, I sketch carefully because they leak into every feature later. Almost everything else, hosting, framework, the exact database, I treat as cheap to swap and refuse to agonize over on day one. The one I would flag for anyone building with AI right now: do not let your app marry a single model's API and its quirks. Model choice is the fastest moving part of the whole stack, so keep that layer thin and swappable from the start. The teams I see moving fastest can change the model under the hood without touching product code. That is the kind of reversibility that actually pays off this year.
I lock in ownership boundaries before vendor choices: which system is authoritative for identity, billing, user data, and generated artifacts. Libraries can move. Two services believing they own the same state creates the migrations that hurt. The stack matters less than knowing where truth lives.
MyNextBrowser
I’m not technical enough to recommend one universal stack, but I’d prioritize reversibility. The earliest architecture should make it easy to test demand and change direction without creating obvious security or data problems.
I’m not technical enough to comment on this, but I’d prioritize reversibility. The earliest architecture should make it easy to test demand and change direction without creating obvious security or data problems.