Question 1

Should I choose REST or GraphQL?

Accepted Answer

REST remains the best default for public APIs and simple resource models: it caches well over HTTP, every developer knows it, and tooling is universal. GraphQL earns its complexity when many different clients need different slices of the same data — typically dashboards and mobile apps over a rich domain — because it eliminates over-fetching and endpoint sprawl. We often combine them: REST for public surface, GraphQL for internal product UIs.

Question 2

How long does a typical API project take?

Accepted Answer

A well-scoped API for a single product — 15 to 30 endpoints with auth, docs, and tests — typically takes 4 to 8 weeks. Public-facing API products take longer because rate limiting, developer onboarding, monitoring, and documentation polish become first-class features rather than afterthoughts.

Question 3

How do you handle API versioning?

Accepted Answer

Our first goal is to avoid breaking changes entirely through additive evolution — new fields and endpoints rather than changed ones. When a breaking change is unavoidable we version explicitly (URL path or header), run old and new versions side by side, and publish a deprecation timeline with usage monitoring so no consumer is surprised.

Question 4

What does good API performance look like?

Accepted Answer

For typical CRUD operations we target p95 latency under 200ms and p99 under 500ms at expected load; read-heavy endpoints often reach sub-50ms with Redis caching. The number that matters most is the tail, not the average — a fast median with a slow p99 still means thousands of bad requests per day at scale.

Question 5

How do you secure the APIs you build?

Accepted Answer

Authentication via OAuth 2.0, OpenID Connect, or signed API keys depending on the consumer type; authorization enforced per-scope and per-resource, never just at the route level. We add rate limiting, input validation at the schema boundary, and audit logging, and we review against the OWASP API Security Top 10 — broken object-level authorization is the most common real-world API vulnerability, so we test for it explicitly.

Question 6

Can you build APIs on top of our legacy systems?

Accepted Answer

Yes — this is one of the most valuable uses of an API layer. We wrap legacy databases, SOAP services, or ERP systems behind a clean modern interface, which lets you build new apps and integrations without touching the fragile core. The legacy system can then be modernized or replaced incrementally behind the stable contract.

Question 7

Do you provide API documentation?

Accepted Answer

Always — an undocumented API is unfinished work. Every project ships with an OpenAPI specification, interactive docs (Swagger UI or a hosted portal), a ready-to-import Postman collection, and request/response examples for every endpoint. For partner-facing APIs we also write onboarding guides covering authentication and common workflows.

Question 8

What about webhooks and real-time features?

Accepted Answer

We build webhook systems with signed payloads, automatic retries with exponential backoff, and delivery dashboards — the details that separate reliable webhooks from ones partners complain about. For live in-app features like chat, presence, or dashboards we use WebSockets or Server-Sent Events, choosing based on whether you need bidirectional communication.

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