APIs your partners actually enjoy using
Well-versioned, well-documented REST or GraphQL APIs with auth, rate limiting, and webhooks. Built to be consumed by partners and customers - not only your own frontend.
A public API is a contract. I treat it that way - versioned cleanly, documented from day one, monitored, and designed so that the SDK practically writes itself.
30+
Production APIs shipped
<50ms
p95 on cached endpoints
99.9%
Uptime across deployed APIs
100%
Routes documented in OpenAPI
Trusted by founders & teams in
Smit Parekh
Full-Stack Developer
Gujarat, India · available worldwide
I'm the only person who touches your code. You talk directly to the senior developer writing every line - no account managers, no juniors, no handoffs. React, Next.js, Node.js, TypeScript and PostgreSQL, end to end.
- AWS Certified Solutions Architect
- 4+ years shipping production web apps
- 20+ live systems across FinTech, SaaS & AI
Everything included in every engagement
No upsells. No surprise change orders. One scope, one price.
REST or GraphQL - picked for you
Not religion. REST for resource-shaped data and CDN cacheability. GraphQL when clients need flexible shapes and there's a real schema team.
OpenAPI / GraphQL schema
Generated docs that stay accurate. Type-safe clients for TypeScript, Python, Go via openapi-typescript or codegen. Postman collection on request.
Auth that scales beyond your frontend
API keys with rotation, OAuth 2.0 with PKCE, JWT with refresh, mTLS for partner integrations. Scoped permissions per token.
Rate limiting + quotas
Per-key, per-IP, per-endpoint limits with Redis. Quota dashboards your customers can self-serve. Burst tolerance + 429 with Retry-After done right.
Webhooks with retry & signing
HMAC-signed payloads, exponential backoff with jitter, dead-letter for failures, replay endpoint, idempotency keys on inbound.
Usage analytics & SLOs
Per-customer usage dashboards, p95/p99 latency tracking, error budget alerting. Sales can see who's hitting their limits.
Results that build trust
The numbers behind the work - measured on real production data, not demos.
30+
Production APIs shipped
<50ms
p95 on cached endpoints
99.9%
Uptime across deployed APIs
100%
Routes documented in OpenAPI
The tools I actually use in production
Modern, battle-tested, and chosen for fit - not hype.
REST
- NestJS
- Fastify
- OpenAPI
- Zod
GraphQL
- Apollo Server
- Pothos
- DataLoader
- Mercurius
Auth
- JWT
- OAuth 2.0
- Supabase Auth
- Auth0
Infra
- Redis
- Kong / Tyk
- Cloudflare
- AWS API Gateway
How we'll work together
Predictable, written-down, no surprises.
- 01
Design first
Endpoints, resources, errors, pagination, versioning strategy - all written in OpenAPI before code.
- 02
Reference implementation
Build a thin slice end-to-end: auth, one resource, full docs, one SDK. Validates the design with a real consumer.
- 03
Build the surface
Fan out the rest of the endpoints. Contract tests against the schema run on every PR.
- 04
Launch & monitor
Public docs site, sandbox keys, status page, and webhook test tool - the things partners actually expect.
AWS Certified
Solutions Architect
I'm Smit Parekh - a full-stack developer who writes every single line of your code
With 4+ years of experience shipping production systems for FinTech, SaaS, and AI startups, I work as a senior individual contributor - no juniors on your project, no account managers between you and the work. Every commit, every architecture decision, every deployment lands on my machine first.
I specialise in the TypeScript ecosystem - React & Next.js on the frontend, Node.js / NestJS on the backend, PostgreSQL for data, and AWS for infrastructure. I've built headless e-commerce stores, multi-tenant SaaS platforms, real-time dashboards, AI-powered tools, and performance-first marketing sites. The common thread: clean code, zero tech-debt handover docs, and measurable business results.
10+ production apps shipped
FinTech, SaaS, AI startups & e-commerce
95+ Lighthouse scores, guaranteed
Performance baked in from day one
AWS Certified Solutions Architect
Infrastructure decisions you can trust
Direct, async-first communication
You talk to who writes every line of code
My daily stack
Pricing that matches the work
Starting prices. Final quote in writing after a 30-minute scoping call.
Internal API
Backend for your own frontend
$3,000starting
- 10-20 endpoints
- JWT auth, OpenAPI docs
- Tests, CI, deploy
Public API
APIs your customers consume
$8,500starting
- API keys, quotas, rate limiting
- Webhooks + SDK
- Public docs site + sandbox
- Status page + monitoring
Retainer
Long-term API evolution
$2,500/mostarting
- New endpoints, deprecations
- SDK maintenance
- On-call coverage
Me vs. an agency vs. hiring in-house
Three ways to get this built. Here's the honest comparison.
Best value Solo Dev (me) $80-$120 /hr or fixed | Agency $150-$300 /hr blended | In-house hire $80-$120K /yr + benefits | |
|---|---|---|---|
| Start date | 1-2 weeks from quote | 4-8 weeks onboarding | 8-16 weeks to hire |
| Who writes the code | Senior dev - every single line | Junior assigned to your account | Whoever you manage to hire |
| Communication | Direct - you talk to who codes | Via account manager first | Direct, but management overhead |
| Flexibility | Scale up or down any time | Locked to contract length | Fixed headcount, hard to change |
| Code ownership | 100% yours, full handover docs | Depends on contract terms | Yours, but bus factor risk |
| Risk | Weekly demos, fixed scope | Scope creep & handoff gaps | Wrong hire = months lost |
Questions I get asked first
REST or GraphQL?+
REST for partner-facing APIs (CDN-cacheable, simple integration). GraphQL when clients need to compose responses and there's a schema team. I'll recommend based on your actual consumers, not preference.
Do you build SDKs?+
Yes. TypeScript first, then Python, Go, and Ruby on request. Generated from OpenAPI so they stay in sync with the API.
How do you version an API?+
URL path versioning (/v1, /v2) with a documented deprecation window - typically 12 months - and a changelog endpoint for clients to subscribe to.
What about API gateway and edge?+
Kong, Tyk, or AWS API Gateway depending on your infra. Cloudflare Workers for edge auth and rate limiting where it makes sense.
Let's scope your project
Tell me what you're building. I'll reply with a written estimate within 24 hours - no sales call required.
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