How to Hire a Backend API Developer: What to Look For
“Backend developer” covers a wide range of skill sets, and hiring the wrong fit for your specific problem is the most common mistake founders make. Here’s what actually matters when you’re hiring for backend and API work.
Define What Kind of Backend You Actually Need
“Backend developer” can mean a REST API for a mobile app, a GraphQL layer for a complex frontend, a webhook-driven integration between two SaaS tools, or a high-throughput service handling real traffic at scale. These are different jobs with different skill requirements, so start by writing down what the backend actually needs to do — not just “build an API.”
Technical Skills That Matter
- API design — clean, versioned, well-documented endpoints that won’t need a rewrite the first time a new client integrates
- Database design — schemas that hold up under real query patterns, not just the demo data
- Authentication and authorization — API keys, OAuth, or JWTs implemented correctly, not bolted on as an afterthought
- Rate limiting and error handling — the backend needs to fail gracefully, not silently or catastrophically
- Experience with your actual stack — Go, Node.js, Python, and their respective frameworks all have different tradeoffs
Questions to Ask Before You Hire
- How would you handle a spike in traffic on this endpoint?
- What’s your approach to versioning an API once clients are already using it?
- How do you decide between REST, GraphQL, and gRPC for a given project?
- Can you walk me through how you’d structure the database for this specific use case?
Red Flags
Be cautious of developers who can’t explain their past architecture decisions, who treat security and rate limiting as optional extras, or who quote a price without asking about your expected traffic and data model first. A vague answer to “what happens if this breaks in production” is usually a sign the operational side hasn’t been thought through.
Have a backend or API project scoped out? See my Backend API Development Services page, or get in touch to talk through what you’re building.