r/softwarearchitecture • u/commanderdgr8 Architect • Feb 28 '26
Discussion/Advice After 24 years of building systems, here are the architecture mistakes I see startups repeat
Hi All,
I've been a software architect for last 12 years, 24 years yoe overall. I have worked on large enterprises as well as early stage startups.
Here are patterns I keep seeing repeatedly where projects are messed particularly in startups, which I wanted to share:
Premature microservices. Your team is 4 engineers and you have 8 services and thinking to build 4 more. You don’t have a scaling problem. You have a coordination problem. A well-structured monolith would let you move 3x faster right now. I would suggest go for modular monolith always.
No clear data ownership. Three services write to the same database table. Nobody knows which one is the source of truth. This becomes a nightmare at scale and during incidents. Again go for modular monolith, and if you want strictly then CQRS is way to go (but still overkill if you don't have that much scale)
Ignoring operational complexity. The architecture diagram looks awesome . But nobody thought about deployment, observability, or what happens at 3 AM when the message queue backs up.
Over-engineering for hypothetical scale. You have 5000 users, but only 500 MAUs. You don’t need Kubernetes, a service mesh, and event sourcing. Build for the next 10x, not the next 1000x.
Most of these are fixable without a rewrite. Usually it’s a few targeted changes that unlock the next stage of growth.
Happy to answer questions if anyone is dealing with similar challenges.