How Long Does It Take to Build a Web App
Timelines that survive contact with real scope — from a focused tool to a multi-role product.
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The ranges that are honest
A focused internal tool with one user type can ship in 6–10 weeks. A customer-facing app with auth, payments, and an admin usually takes 3–5 months for a first useful release. Marketplaces, multi-tenant SaaS, and anything with heavy integrations sit closer to 5–8 months. Anyone promising a full product in two weeks is selling a prototype.
A date without a cut of v1 is a wish. A date with a cut is a plan.
/ Dimitriy Caliber
What actually eats the calendar
Code is rarely the slowest part. Waiting on copy, legal, API access, and founder decisions is. So is changing the primary user after sprint two. If you want speed, freeze v1, answer questions within 48 hours, and keep one product owner. Parallel design and engineering only works when the flow is already agreed.
- Unclear roles and permissions
- Third-party APIs without sandbox access
- Design still moving while engineering is staffed
How we sequence the work
First the spine: auth, the main object, the core screen. Then the money path or the operational path — whichever proves the product. Polish, extra roles, and nice-to-haves come after a demo that a real user can complete. That order is how you get a date you can defend.
Protect the date
When something new appears, it either replaces an item in v1 or it waits. Adding without cutting is how a 12-week plan becomes 20. Write that rule down on day one. It is more useful than a Gantt chart nobody updates.
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