How to Choose a Developer for Your Startup — Practical Guide 2025
For non-technical founders, evaluating a development partner can be hard. This guide offers concrete criteria — observable signals, structured questions, and a short practical test — so you can compare proposals without needing programming expertise.
Red flags — signs something's off
These are warning signals we've seen over 10+ years of clients coming to us after bad experiences:
- Very low price with no questions — a serious developer asks questions before quoting. If you get a fixed price in 5 minutes from a vague description, they're either unprofessional or the price will jump dramatically later.
- No questions before the quote — every project is different. If they didn't ask about features, integrations, user volume, or timeline, they don't understand what they're building.
- Portfolio without code or technical detail — links to working sites are good, but not enough. Ask them to explain what they did technically on past projects. If they can't, they either didn't build it or don't understand what they built.
- "I can do anything" — nobody is an expert in everything. An honest developer knows what they're good at and what they're not. Someone who claims they can do anything in any technology is either a junior who doesn't know what they don't know, or someone subcontracting without telling you.
- Avoids explaining technical decisions — a good developer can always explain why they chose a technology or approach, in terms you understand. If the answer is always "it's technical, not important for you" — that's a bad sign.
- No contract or vague contract — one milestone, one payment, one delivery. Without clear contracts, you have no protection if things go wrong.
Good questions to ask — no technical jargon
You don't need to code to evaluate a developer. These questions reveal how they think and work:
- "Tell me about a project that went wrong and what you learned from it." Anyone with real experience has at least one such story. If they don't, or the answer is vague, that's inexperience or lack of honesty.
- "How do you handle requirements that change mid-project?" Requirements always change. You want to know if they have a process or if they freeze up or push back.
- "How many hours per week will you allocate to my project?" A direct question many avoid answering clearly. If they can't give a number, they're juggling multiple projects and don't know how much time they have free.
- "What happens if I need changes after launch?" Every project has bugs and post-launch adjustments. You want to know upfront: is it included, billed separately, is there a warranty?
The paid test project trick
The most effective filter I know: pay €100–€300 for a small, real task before the big contract.
Not a free test — a paid, fair test. The task should be something real from your project: a simple page, an API integration, a feature prototype. Something that takes 4–8 hours and produces a concrete deliverable.
Watch for:
- Do they ask clarifying questions before starting? (good sign)
- Do they deliver on time or proactively notify if delayed?
- Is the code readable, with comments where needed, or an incomprehensible mess?
- Do they communicate on their own initiative or do you have to chase them?
How a developer handles a €200 task is exactly how they'll handle a €20,000 project. No exceptions.
How to evaluate the portfolio
Three questions to ask for each project in their portfolio:
- "What was the hardest technical problem in this project and how did you solve it?" If they can't answer specifically, the project probably isn't theirs or they didn't understand what they built.
- "Is the project still live? Can I talk to the client?" Direct references from past clients are the best quality indicator. If they refuse or have no references, that's concerning.
- "If you did this project again, what would you do differently?" Good developers reflect on their work and identify improvements. "Nothing, everything was perfect" means they don't think critically.
A word on price
The cheapest developer is never the cheapest long-term. A poorly delivered project that needs rebuilding costs 3–5x more than one done right from the start. The optimal budget isn't the lowest you find — it's the lowest for the quality you need.