Why Software Projects Fail: 12 Causes and How to Avoid Them
Why software projects fail, seen from the developer's side: 12 causes like vague scope, no decision-maker and no tests, and how to prevent each one.
Freelance full-stack developer
- Published
- Reading time
- 14 min
In this post8
Most software projects that fail were in trouble before anyone wrote a line of code. Look at why software projects fail from the developer's side and the causes are surprisingly predictable: no clear goal, scope that keeps growing, nobody with the final say, and a price agreed before anyone understood the work. Below are 12 causes, each with one concrete way to prevent it.
I'm a freelance developer based in Denmark, and a few of these causes sit squarely with people like me. They're on the list anyway.
The short answer: 12 causes and what prevents them
A software project can fail in three ways. It never ships, it ships far over budget, or it ships and nobody uses it. The third is the one people overlook, because it never shows up as a red line in a spreadsheet.
| Cause | When you usually notice | Prevention |
|---|---|---|
| 1. Nobody can say what problem it solves | After launch, when nobody uses it | A one-sentence goal you can measure |
| 2. Everything goes into version one | When the budget is gone and half is missing | A must-have list and a later list |
| 3. Nobody has the final say | When the developer waits weeks for answers | One decision-maker with authority and time |
| 4. The price was set before the work was understood | At the first change request invoice | A range first, a fixed price after discovery |
| 5. You only see the product at the end | At handover | A demo of working software every one to two weeks |
| 6. New requests pile on top | When the deadline slips and nobody decided it should | Something comes out when something goes in |
| 7. Integrations and data are underestimated | When data has to move or an old system has to connect | Map integrations and data before estimating |
| 8. No automated tests | When every new feature breaks an old one | Tests for the parts that must not break |
| 9. The tech suits the developer, not the project | When someone else has to take over | Mainstream tools and a reason you understand |
| 10. Shortcuts never get cleaned up | When small changes take weeks | Regular time set aside for cleanup and updates |
| 11. Everything depends on one person | When that person is ill or leaves | Code, accounts and docs in your company's name |
| 12. Launch is treated as the finish line | Months after go-live | A maintenance budget and an internal owner |
My rule of thumb: if you can't answer the first four, don't start yet. The other eight can be fixed along the way, but each one gets more expensive the longer you wait. As a rough guide, at Western European freelance rates a single month of one developer's rework can easily run into five figures in euros.
This list assumes you've already picked someone. If you haven't, start with my complete guide to hiring a developer.
Before any code is written: four causes built in from day one
1. Nobody can say what problem the project solves
Plenty of projects start with a solution. "We need an app." "We need a customer portal." Ask what should be different a year from now and the answer is fuzzy, or three people give three different answers.
Without a clear goal, nobody can prioritize. Every feature feels equally important, so nothing gets cut. The project can ship on time and on budget and still fail, because it solves a problem nobody actually had.
How to avoid it: Write the goal in one sentence and make it measurable. For example: "Customers can view and pay their own invoices, so finance gets half as many phone calls." Talk to a few of the people who'll use the system before anything gets designed. Any feature that doesn't move the goal is a candidate for version two.
2. Everything goes into version one
Once a budget is approved, it feels like now or never. So every wish goes in: reports, user roles, integrations, maybe a mobile app on the side. The result is a project far bigger than it needs to be, and one that takes a long time before anyone can use it.
From where I sit, big projects aren't impossible. The issue is that every extra feature also has to be designed, tested, maintained and explained to users, and the whole launch waits for the slowest piece.
How to avoid it: Split your wishes into two lists: what's needed to hit the goal, and what can wait. Be ruthless with the first list. Version one should be small enough to get into real users' hands quickly, so you learn from them instead of guessing. If you need help putting that on paper, use my project brief template for developers.
3. Nobody has the final say
The developer asks a question and it circulates around the company. The CEO wants one thing, sales wants another, and the person running the project doesn't have the authority to choose. Meanwhile, work stops or the developer guesses.
The opposite is just as bad: a decision-maker with authority but no time. An answer that takes a week costs either a week of waiting or a week of work that has to be redone.
How to avoid it: Name one person who makes day-to-day decisions, and make sure they have time for it in their calendar. Agree which decisions go up to management and how fast they need to come back. For the weekly rhythm that makes this work, see how to work with a developer.
4. The price was set before anyone understood the work
The project gets described in a short call, and a fixed price of, say, €40,000 lands in your inbox the next day. The budget is approved on that number. The problem is that nobody, the developer included, knew exactly what was being built. Either there's a large buffer baked in, or everything missing from the description turns into change requests and arguments.
Here's the view from the other side of the table: an estimate is never better than the understanding behind it. When I estimate, the uncertainty comes from the unknowns: integrations, legacy data and business rules that only live in one employee's head.
How to avoid it: Ask for a range early and a fixed price later. For larger projects, a short paid discovery phase is the most reliable route. Goals, scope and unknowns are clarified and written down first, and only then estimated. That's how I start larger projects myself, at a fixed price. I've covered what a discovery phase costs and when it pays off separately. Also keep part of the budget free for surprises. My rule of thumb is 15-20%.
During the build: how projects drift without anyone noticing
The next three causes show up once work is underway. They're harder to spot, because everything can look fine in a status update.
5. You only see the product at the end
The plan is that you'll see the system when it's done. Until then, you hear that things are going well. At handover, it turns out a core part was misunderstood.
The longer the gap between something being built and you seeing it, the more gets built on top of it. That's why late discoveries hurt: it's rarely one screen that needs redoing, it's everything that depends on it.
How to avoid it: Agree on a short demo of working software every week or two. Get access to a staging environment (a test copy of the system) so you can click around between demos. Spend fifteen minutes after each demo writing down what needs to change. Small corrections every other week cost less than one big correction at the end.
6. New requests pile on top
Good ideas will come up along the way. That's healthy: you learn things once you see the system. The trouble starts when new requests get added on top, nothing comes out, and nobody says what it means for the timeline. Each change is small. Together, they move the deadline without anyone deciding to move it.
How to avoid it: Keep a single list of requests, prioritized by your decision-maker. Anything new gets a price or a place in the queue, and something else may have to drop out. Put the change process in writing: how changes are estimated and approved before anyone works on them. My freelance developer contract checklist covers what else that agreement should include.
7. Integrations and data are underestimated
The quote says "integration with accounting system" on a single line. In reality, the system's API has limits nobody knew about, and the old customer data sits in three spreadsheets with three spellings of every company name.
Integrations and data migration (moving data from the old system to the new one) are usually the hardest parts of a project to estimate. Nobody knows what's hiding in there until someone looks.
How to avoid it: List every system that needs to connect and every dataset that needs to move. Let the developer read the API documentation and see a real data export before estimating. That's a typical discovery task. If the data includes personal information, bring GDPR in from the start: what's allowed to move, and what should be deleted on the way.
The technical side: causes that hurt later
8. There are no automated tests
Without automated tests, the only way to know something works is for someone to click through it. That's fine early on. But as the system grows, there's more to click through, and a new feature can quietly break login or payments until a customer finds out.
The final stage is the most expensive one: the developer is afraid to change anything because nobody knows what will break. At that point, even small changes take days.
How to avoid it: Ask before you start how the developer tests their work. You don't need tests for everything. But the parts your business depends on, like payments, login and calculations, should be covered by tests that run automatically every time the code changes. A small marketing site rarely needs this. A system your business runs on does.
9. The tech suits the developer, not the project
Some projects get built with the newest tool because the developer wants to try it. Others are built as if they had to handle millions of users from day one, with an architecture far more complex than the job requires. Both make the project more expensive to build and harder to hand over. So does a niche technology that few other developers know.
How to avoid it: Ask for a reason behind the tech choice that's about your project: expected users, integrations, and who'll maintain it afterwards. Default to mainstream tools with a large developer community, so you're never stuck with one person. I work mainly with Laravel and React/Next.js, so I have a stake in that advice. The principle holds whatever stack you end up with.
10. Shortcuts under deadline pressure never get cleaned up
As a deadline gets close, everyone takes shortcuts. Often that's the right call. The problem is when shortcuts become permanent: a quick fix here, an update postponed again there. That's technical debt, and it charges interest: each new change takes a bit longer than the last.
How to avoid it: Ask the developer to log shortcuts as they're taken, so they don't get forgotten. Set aside regular time for cleanup and updates, for example a small slice of every month. Paying for work you can't see feels dull. The alternative is paying more for every piece of work you can see.
After launch: when nobody owns the system
11. Everything depends on one person
The code sits in the developer's account, the server is on the developer's credit card, and the only documentation is in the developer's head. It works fine until that person gets ill, gets busy or moves on. Then even a small bug can turn into weeks without a fix.
That applies to freelancers like me too. One developer is a good fit for many projects, but only if the work can be handed over without starting from scratch. It matters even more when your developer works from another country, as is common for EU companies hiring remotely.
How to avoid it: Put the code in a repository owned by your company from day one, and register the domain, hosting and other services in your company's name. Ask for short documentation of how the system is set up and deployed. With me, the client owns the code from the first day, and that should be true whoever you hire.
12. Launch is treated as the finish line
The budget runs out at go-live and nobody has planned what happens next. But launch is exactly when real users start finding bugs, asking for changes and discovering what's missing. Meanwhile, the framework and packages need regular updates to close security holes.
The other thing people overlook is adoption. Your team actually has to start using the system. Without training and someone to ask, people drift back to the old spreadsheet.
How to avoid it: Set aside budget for maintenance and further development before the project starts, and name an internal owner for the system after launch. Plan the rollout itself: who needs training, when the old system gets switched off, and who collects feedback in the first few weeks.
Early warning signs your project is heading for trouble
Projects rarely fail overnight. There are almost always signs along the way:
- Demos get postponed, or you see slides instead of working software.
- A task has been "almost done" for several weeks.
- The estimate for the remaining work changes every time you ask.
- You can't see where the hours went.
- The same bugs come back after being fixed.
- The developer pushes back on changes because "something might break".
If you see two or more, stop and ask for an honest status: what's done, what's left, and what's uncertain. Reprioritize, and consider cutting scope rather than extending the timeline. If trust is gone, switching may be the right move. Here's how to switch developers mid-project without losing what's already built.
Next steps: check the first four before you start
Run through this list before you sign off on a project, and again a few weeks in.
Ready to start? Eight things that should be in place
- The goal fits in one sentence, and you know how you'll measure it.
- There's a list of what goes into version one and what can wait.
- One named person makes decisions and has time to do it.
- The price is based on understood work, with a buffer for surprises.
- Regular demos are agreed, and you have access to a staging environment.
- Integrations and data that need to move are mapped.
- Code, domain and accounts are set up in your company's name.
- There's a budget and an owner for maintenance after launch.
If you can't tick the first four, your next step isn't hiring a developer. It's clarifying the work, either on your own with a project brief or in a paid discovery phase. Sometimes that process shows you don't need anything built at all, because off-the-shelf software covers it. That's a good outcome too. If you want to see how I price discovery and the projects that follow, it's all on my pricing page.
Frequently asked questions
What percentage of software projects fail?
There's no single figure I'd stand behind. The numbers that circulate use different definitions of failure: late, over budget, never finished or never adopted. What matters more is agreeing on your own definition before you start. A project that ships on time and on budget has still failed if nobody uses it.
Can a stalled software project be rescued?
Often, yes, though not always in its current form. Start with an honest code review and a list of what works, what's missing and what's uncertain. Usually part of the code can be kept while the rest is cleaned up or rebuilt. Starting over from scratch is rarely the cheapest option, but it can be the right one if the foundation doesn't hold.
Does a fixed price protect you from project failure?
Only partly. A fixed price shifts the financial risk to the developer, but it doesn't fix a vague goal or a missing decision-maker. When the work is unclear, fixed-price projects tend to end in arguments about what was included. Fixed pricing works best once scope is clarified, for example after discovery, and when there's an agreed process for changes.
Is agile development the fix?
Agile helps with several of these causes, especially late feedback and new requests, because you see working software every few weeks and can reprioritize as you go. But it asks more of you as the client: a decision-maker who shows up, and a willingness to cut things. Without that, agile just becomes another word for not having a plan.
Who is responsible when a software project fails?
Usually both sides share it. The developer is responsible for professional quality, honest estimates and flagging anything unclear. The client is responsible for goals, decisions and access to the knowledge the project needs. What applies legally depends on your contract and the governing law in it. If you're in a real dispute, talk to a lawyer.