What Founders Get Wrong About Software Estimates

We have been estimating software projects for five years. Across 12+ shipped products, hundreds of features, and more proposals than we can count, we have learned something uncomfortable: the biggest source of project failure is not bad code. It is misaligned expectations around estimates.

Founders are smart, driven people. They understand their market, their users, and their business model. But most of them have never bought custom software before, and they bring assumptions from other industries that do not translate. A construction quote and a software estimate are fundamentally different things, and treating them the same way leads to frustration on both sides.

Here are the mistakes we see most often, and how to avoid them.

Mistake 1: Treating an Estimate as a Commitment

This is the big one. A founder asks “how long will this take?” and we say “probably 6-8 weeks.” The founder hears “it will be done in 6 weeks” and plans their launch date, investor update, and marketing campaign around that number.

An estimate is a prediction, not a promise. It is our best guess based on what we know today. And what we know today is always incomplete.

Consider what happens between “estimate” and “done” on a typical project:

• The payment provider’s API turns out to have an undocumented limitation
• The design mockups did not account for a mobile viewport edge case
• A third-party dependency releases a breaking change
• The founder sees a competitor feature and wants to add something similar
• User testing reveals that the original flow confuses people

Every one of these is normal. None of them were predictable at estimation time. But each one adds days or weeks.

What to do instead: Ask your development team for a range, not a number. “6-8 weeks” is honest. “6 weeks” is a fantasy. Plan around the upper end of the range, and treat the lower end as a pleasant surprise.

Mistake 2: Comparing Quotes Without Comparing Scope

A founder gets three quotes for their MVP:

• Agency A: $40,000 / 8 weeks
• Agency B: $25,000 / 6 weeks
• Threshline: $35,000 / 8-10 weeks

Agency B looks like the obvious choice. Cheaper and faster.

But what is actually in each quote? Agency A might include responsive design, automated testing, CI/CD pipeline, and documentation. Agency B might deliver a desktop-only prototype with no tests and a “works on my machine” deployment. Our quote might include all of the above plus Supabase Row Level Security, proper error handling, and a handoff session where we walk the founder through the codebase.

We have inherited projects from cheaper agencies three times in the past two years. In every case, the cost of fixing the codebase exceeded the cost of building it correctly the first time. One client came to us after spending $20,000 on an MVP that could not handle more than 10 concurrent users. We rebuilt the core from scratch.

What to do instead: Ask each vendor to break down their quote by feature. Compare line items. Ask specifically about:

• Automated testing (any? unit? integration? end-to-end?)
• Deployment and hosting setup
• Error monitoring and logging
• Mobile responsiveness
• Security basics (authentication, authorization, input validation)
• Documentation and knowledge transfer

If a quote does not mention these, they are probably not included.

Mistake 3: Specifying the Solution Instead of the Problem

“We need a React Native app with a PostgreSQL backend and GraphQL API.”

That is a solution specification, not a problem description. And it might be the wrong solution.

When founders specify the technology, they constrain the team before the team has a chance to understand the problem. Maybe the app does not need to be native — a well-built progressive web app would ship faster, cost less, and still work on both platforms. Maybe GraphQL is unnecessary overhead for an app with 15 API endpoints. Maybe PostgreSQL is the right database, or maybe you need something else entirely.

We built JustTheRip — a digital pack-opening platform for trading card games. The founders initially wanted a traditional REST API with real-time polling for the pack-opening animations. After understanding the actual user experience they wanted, we implemented WebSocket connections for instant feedback, which was a completely different architecture than what they originally described. The result was dramatically better.

What to do instead: Describe the problem, not the solution. Tell your development team:

• Who are your users?
• What are they trying to accomplish?
• What does success look like?
• What constraints exist (budget, timeline, regulatory)?

Let the technical team propose the solution. That is what you are paying them for.

Mistake 4: Expecting Waterfall Accuracy with Agile Delivery

Founders often want two contradictory things: a fixed price and scope determined up front (waterfall), combined with the ability to change direction based on user feedback (agile).

You can have one or the other. You cannot have both.

Fixed price, fixed scope: We estimate the entire project up front, lock the scope, and deliver exactly what was agreed. Any changes go through a change order process. This works for projects with well-understood requirements — things that have been built before.

Flexible scope, time-and-materials: We work in sprints, the founder prioritizes features each sprint, and we build the most important things first. The total cost depends on how many sprints it takes to reach “good enough.” This works for products where the founder is still figuring out what users want — which is most startups.

The hybrid approach we recommend for most MVPs: fixed budget with flexible scope. We agree on a budget (say, $40,000) and a prioritized feature list. We build features in priority order until the budget runs out. The founder gets the most important features guaranteed, and the nice-to-haves get built if time allows.

This is how we built MindHyv. The feature list was ambitious, but we agreed on clear priorities. The core booking and invoicing features shipped first. Social features came later. The founder could launch and start generating revenue while we continued building.

Mistake 5: Ignoring the Unknowns

When a founder says “it is just a simple app,” we know the estimate is going to be wrong. Not because simple apps are hard, but because “simple” means the founder has not thought through the details yet.

Here is what “simple” usually hides:

“Users can sign up and log in.” Okay. Email/password? Social login? Magic links? Password reset flow? Email verification? Account deletion (legally required in many jurisdictions)? Two-factor authentication? Session management across devices?

“Users can upload their profile photo.” File size limits? Image cropping? Format validation? Storage and CDN? What happens if the upload fails? What about HEIC files from iPhones? For more on the complexity here, read our post on building a file upload system.

“There is an admin dashboard.” With what data? Which metrics? Real-time or batch? Filterable? Exportable? Who has access? What about different admin roles?

Each of these “simple” features has 5-20 decisions hiding inside it. Those decisions take time to make and time to implement.

What to do instead: Before asking for an estimate, write down every screen in your app and every action a user can take on each screen. List the edge cases you can think of. The more detailed your brief, the more accurate the estimate.

We have a post coming on how to write an effective project brief. In the meantime, think of it this way: every sentence you write in your brief saves an hour of back-and-forth later.

Mistake 6: Not Budgeting for Post-Launch

The estimate covers building the product. It does not cover what happens after launch. And something always happens after launch.

• Users find bugs that testing missed
• A third-party API changes its pricing or terms
• Traffic exceeds expectations and the infrastructure needs scaling
• The founder wants to iterate based on user feedback
• Security patches need to be applied
• The app store rejects an update for a policy violation

We tell every client: budget 15-20% of the build cost for the first three months after launch. If you spent $40,000 building the product, keep $6,000-$8,000 reserved for post-launch work.

This is not a problem unique to software. A restaurant budgets for maintenance after opening. A car requires service after purchase. Software is the same — it is a living thing that needs ongoing attention.

Mistake 7: Optimizing for Speed Over Foundation

“Can we skip testing to ship faster?” “Do we really need authentication? Can we add it later?” “Let us just hardcode that for now.”

Every shortcut taken during development becomes a tax on every future change. Skipping automated tests means every new feature risks breaking existing features, and you will not know until a user reports it. Skipping authentication means bolting it on later will require touching every API endpoint. Hardcoding values means someone has to find and replace them all when the business requirements change.

We have built MVPs in 4-6 weeks that included proper authentication, automated testing, CI/CD, and production monitoring. Cutting corners does not meaningfully reduce the timeline — it just moves the cost from “before launch” to “after launch,” where it is more expensive and more painful.

For Trackelio, we invested in solid testing and CI/CD from the start. When we needed to refactor the feedback aggregation pipeline three months later, the test suite caught every regression. That refactor took 3 days. Without tests, it would have taken 2 weeks of careful manual verification.

What to do instead: Trust your development team when they say something is necessary. If they recommend automated testing, it is not because they want to pad the estimate. It is because they have been burned before and they are trying to protect you.

How to Have Better Estimation Conversations

After five years of these conversations, here is what works:

1. Share your budget range early. This is not about getting the cheapest price. It is about letting the team propose a realistic scope. If your budget is $30,000, say so. A good team will tell you what they can build for that amount, not just tell you what you want to hear.

2. Prioritize ruthlessly. List every feature. Mark each one as must-have, should-have, or nice-to-have. Be honest — if your MVP has 20 must-have features, you have not prioritized.

3. Ask about risks. “What could go wrong? What are the unknowns? Where are you least confident in the estimate?” A team that says “nothing could go wrong” is a team you should not hire.

4. Plan for iteration. Your V1 will not be perfect. That is fine. Budget for a V1.1 that addresses what you learn from real users. The best products we have shipped — MindHyv, LancerSpace, VincelIO — all looked significantly different six months after launch than they did on day one.

5. Value communication over credentials. The best technical team in the world is useless if they cannot explain what they are building and why. During the proposal phase, pay attention to how clearly the team communicates. That clarity will carry through the entire project.

The Honest Truth About Estimates

No one can tell you exactly how long your software project will take. Anyone who claims otherwise is either lying or has built the exact same thing before. Software estimation is an art informed by experience, not a science with precise outputs.

What we can do is give you an informed range, explain the risks, and adjust as we learn more. We can be transparent about what is going well and what is taking longer than expected. We can prioritize the work that matters most so that even if the timeline slips, you still have something valuable.

That is the deal. And it is a better deal than a precise number that turns out to be fiction.

If you are planning a software project and want an honest conversation about scope, timeline, and budget, reach out at [email protected]. We would rather lose a deal by being honest than win one by telling you what you want to hear.