Step 1: Define the project before you hire
The most common hiring mistake is looking for a developer before you've defined what you need. Write down the problem you're solving, the core features for version one, your budget range, and what "done" looks like. You don't need a technical spec — you need enough clarity that a developer can give you a real estimate instead of a guess.
This step also filters candidates: a good developer will ask sharp questions about your scope, and you can only tell a sharp question from a vague one if you've thought it through yourself.
Step 2: Where to find good developers
Quality sources, roughly in order of signal:
- Referrals — a developer a peer has worked with is the strongest signal you'll get.
- Portfolios & case studies — developers who publish real, detailed work are easier to evaluate.
- Reputable freelance platforms — useful, but verify with your own reference checks.
- Developer communities and open source — public code is a transparent skill signal.
- Direct outreach — a developer's own site, blog, and shipped projects tell you a lot before you talk.
Step 3: How to evaluate them
Weight evidence over impressions. Anyone can sound competent in a call; what predicts a good outcome is a track record of shipping and maintaining real products. Ask to walk through a project they built end to end: what the problem was, what they chose and why, what broke, and how they handled it.
Look for ownership and judgement. A senior full-stack developer should be comfortable across frontend, backend, database, and deployment, and should be able to explain trade-offs in plain language. If every answer is buzzwords with no specifics, that's your answer.
Step 4: Questions that actually reveal skill
Skip the trivia. These questions surface judgement and working style:
- "Walk me through a project you owned end to end — what would you do differently now?"
- "How do you decide what goes in an MVP versus version two?"
- "How do you handle testing, and what do you choose not to test?"
- "What happens to the code and credentials if we stop working together?"
- "How do you communicate progress, and how often?"
- "Tell me about a time a project went sideways — what did you do?"
Step 5: Trial first, and watch for red flags
Before a full engagement, run a small paid trial — a contained task that mirrors the real work. It tells you more about communication, code quality, and reliability than any interview, and it's cheap insurance against a costly mismatch.
Red flags to take seriously: no portfolio or shippable examples, vague or evasive answers about testing and handover, a quote far below market (which usually means corners will be cut), poor communication during the sales conversation (it won't improve later), and reluctance to let the code live in your repository.
Green flags vs. red flags when hiring a developer
| Area | Green flag | Red flag |
|---|---|---|
| Portfolio | Detailed, real shipped products | None, or only mockups |
| Scoping | Asks sharp questions, gives written estimates | Agrees to everything, vague on price |
| Testing | Explains what they test and why | "It just works" / can't answer |
| Handover | Code in your repo, documented | Code on their machine, no docs |
| Communication | Clear and prompt during sales | Slow, vague, or hard to reach |
| Price | In line with market for the scope | Far below market |