Hiring the wrong web developer can cost you months of delays and thousands of dollars in rework. Getting it right means knowing exactly what to look for before you sign a contract or hand over a deposit. Use this checklist to vet candidates properly and make a confident hire.
Define Your Project Before You Search
You cannot evaluate a developer without knowing what you need built. Before reaching out to anyone, document the following:
- Project type: custom web app, e-commerce store, marketing site, SaaS platform, or redesign
- Tech preferences: React, WordPress, Shopify, Django, Laravel — or open to recommendation
- Timeline: realistic launch date with buffer for revisions
- Budget range: most quality freelancers charge $50–$150/hr; agencies run $5,000–$50,000+ per project
- Ongoing needs: do you need maintenance, hosting support, or future feature development?
A developer who specializes in Shopify storefronts is not the right fit for a custom REST API build. Specificity on your end leads to better matches.
Where to Find Qualified Candidates
Skip generic job boards for anything beyond simple sites. Better sources include:
- Freelance platforms: Toptal, Upwork, and Contra filter for vetted technical talent
- Agency directories: useful when you need a full team (designer + developer + PM)
- Referrals: ask your network for introductions to developers they have actually shipped with
- Comparison platforms: Mercoly lets you compare and find trusted web development providers in one place, which saves significant time when you are evaluating multiple options
Cast a wide net early, then narrow down using the criteria below.
Portfolio Vetting: What to Actually Look For
A portfolio tells you more than a resume. When reviewing work samples, check for:
Relevance — Has the developer built something close to what you need? A portfolio full of brochure sites does not prove they can build a booking system with payment integration.
Live links — Click through to real, working sites. Note page speed, mobile responsiveness, and polish. Use Google PageSpeed Insights to run a quick performance check on their past work.
Code samples — For custom development work, ask for a GitHub profile or a sanitized code sample. Look for readable structure, comments, and consistent conventions.
Case studies — The best developers explain the problem they solved, not just what it looks like. A brief written case study signals clear thinking and communication skills.
Technical Interview Questions Worth Asking
You do not need to be a developer yourself to ask the right questions. These reveal how a candidate thinks:
- "Walk me through how you would approach building [specific feature] in my project."
- "What would you do if you hit a technical blocker two weeks before launch?"
- "How do you handle browser compatibility and mobile responsiveness?"
- "What does your testing process look like before you hand off a project?"
- "Have you worked with my preferred stack? Show me an example."
Vague or defensive answers are red flags. Strong developers explain tradeoffs clearly and admit uncertainty honestly.
Contract and Scope Essentials
Never start work without a written agreement. A proper contract should cover:
- Detailed scope of work with feature list and explicit exclusions
- Milestone-based payment schedule tied to deliverables, not just calendar dates
- Revision limits per milestone to prevent endless feedback loops
- Intellectual property transfer confirming you own the code upon final payment
- Timeline with deadlines and a clause for what happens if either party misses them
- Termination clause so you can exit cleanly if the relationship breaks down
Avoid lump-sum upfront payments. A reasonable structure is 25–33% upfront, milestone payments in the middle, and the remainder on delivery.
Red Flags to Cut Short Immediately
Some warning signs justify walking away regardless of price or availability:
- Cannot provide references from past clients
- Refuses to sign a contract or share a written proposal
- Promises unrealistic timelines without any qualification
- Quotes unusually low rates without explaining how
- Communicates inconsistently or takes days to reply during the vetting stage
- Cannot clearly explain their own previous work
Response speed and communication quality during the hiring process directly predict what working with someone will feel like under deadline pressure.
Final Step: Run a Paid Trial Task
Before committing to a full project, consider offering a small paid task — fixing a bug, building one standalone component, or reviewing your existing codebase. Budget $200–$500 for this and use it to evaluate code quality, communication, turnaround time, and whether their work matches what they promised.
A trial removes guesswork and protects your budget on the larger engagement.
Start your search on Mercoly to compare vetted web development providers side by side and move from candidate list to confident hire faster.