REST API Development

Custom API Development
Built to Connect

We build secure, scalable, and high-performance APIs that connect your websites, mobile apps, third-party services, and business systems for seamless data exchange and automation.

Node.js & LaravelOAuth2 & JWTOpenAPI DocsLegacy migration
200+
APIs Shipped
94%
Avg. Sync Error Reduction
3×
Avg. Response Time Lift
6+ Yrs
API Development Experience
Our Process

How we build step by step

A structured process ensures nothing gets missed, from initial discovery to a fully monitored production API.

  1. 01 Discover

    Discovery & Resource Mapping

    Data models, consumer apps, third-party systems, and existing endpoints inventoried end-to-end before a single route is written.

  2. 02 Architect

    API & Schema Architecture

    Resource structure, versioning strategy, authentication model, and rate-limiting rules decided up front, so the API is fast, predictable, and easy to extend.

  3. 03 Build

    API Development & Testing

    Secure, well-documented endpoints built with modern frameworks, tested against real request loads and edge cases before they're ever consumed by your apps.

  4. 04 Launch

    Launch & Monitoring Setup

    Staging validation, load testing, and monitoring dashboards configured before go-live. Plus 30-day post-launch support for refinements.

What's Included

Every API development service we offer

Auth, versioning, integrations, or performance, we cover the entire API surface end-to-end, not just the endpoints that are easy to template.

Custom REST API Development

End-to-end RESTful APIs built for web apps, mobile apps, and third-party consumers, designed around your data model instead of a generic CRUD template.

  • Node.js / Laravel
  • REST Standards
  • End-to-End Ownership

Authentication & Authorization

Token-based auth, OAuth2, API keys, and role-based access control built in from the start, so every endpoint is protected by design, not as an afterthought.

  • JWT / OAuth2
  • API Keys
  • RBAC

API Versioning & Documentation

Clear versioning strategy and interactive documentation (OpenAPI/Swagger) so consumers know exactly what to expect and what's changed between releases.

  • OpenAPI / Swagger
  • Versioning
  • Changelogs

Rate Limiting & Throttling

Request quotas, throttling rules, and abuse protection configured per client or tier, so your API stays stable under real-world traffic.

  • Rate Limiting
  • Quota Management
  • Abuse Protection

Third-Party & Webhook Integrations

Payment gateways, CRMs, shipping providers, and outbound webhooks connected and documented as part of a single cohesive API surface.

  • Payment Gateways
  • Webhooks
  • Integrations

Legacy API Migration & Modernization

Migrating consumers off outdated SOAP services or unversioned endpoints to a modern REST architecture, incrementally or as a full rebuild, without breaking existing clients.

  • Migration
  • Modernization
  • Zero Downtime

Performance & Caching Strategy

Query optimization, response caching, and pagination built in so your API stays fast as request volume and data size grow.

  • Caching
  • Query Optimization
  • Pagination

Ongoing API Development & Support

Continuous endpoint development, integration upgrades, security patching, and bug fixes, so your API keeps evolving as your products and consumers do.

  • Monitoring
  • Security Patching
  • Support
What You Get

Every deliverable included

  1. Production-Ready Codebase

    Clean, documented backend code following modern conventions, handed off through your Git provider of choice, ready for your team to extend.

  2. Interactive API Documentation

    OpenAPI/Swagger docs generated directly from the codebase, so documentation never drifts out of sync with what's actually deployed.

  3. Authentication & Access Control

    Token-based auth and role-based permissions scoped to each consumer, so internal apps, partners, and public clients each get exactly the access they need.

  4. Automated Test Suite

    Endpoint tests covering core flows and edge cases, so future changes can be verified quickly instead of tested manually every time.

  5. Postman Collection

    A ready-to-import collection covering every endpoint, so your team and partners can start testing and integrating immediately.

  6. 30-Day Support Window

    Post-launch support for bug fixes, configuration tweaks, and technical questions across the full API at no extra cost.

Selected Work

APIs we've shipped

A cross-section of API work, from payments and order management to real-time tracking and public developer platforms.

E-Commerce

Multi-Channel Order API

REST API unifying orders, inventory, and fulfillment across web, mobile, and marketplace channels for a growing e-commerce brand. Order sync errors dropped 94%.

  • Order Management
  • Webhooks
  • Rate Limiting
FinTech

Payments & Ledger API

Secure API handling transactions, reconciliation, and ledger entries for a fintech startup, built with strict auth and audit logging. Passed third-party security review on first submission.

  • OAuth2
  • Audit Logging
  • PCI-Aware Design
Logistics

Real-Time Tracking API

High-throughput API powering live shipment tracking for a logistics operator's customer and partner apps. API response times improved 3x after the rebuild.

  • Real-Time Data
  • Caching
  • High Throughput
Healthcare

Patient Records Integration API

Secure API connecting a clinic's internal systems to a patient-facing portal, with strict role-based access and encrypted data handling. Zero data exposure incidents post-launch.

  • RBAC
  • Data Security
  • Third-Party Integration
SaaS

Public Developer API

Versioned public API with self-serve API keys and interactive documentation for a B2B SaaS platform's developer ecosystem. Partner integration time dropped from weeks to days.

  • Public API
  • Versioning
  • Developer Docs
Legacy Modernization

SOAP-to-REST Migration

Migrated a decade-old SOAP service layer to a modern REST API with zero downtime for existing enterprise consumers. Integration errors dropped after the migration.

  • Migration
  • Modernization
  • Zero Downtime
Client Voices

What it's like to work with us

We measure success in integration errors avoided and response times saved, not just how many endpoints ship. Here's what a few clients had to say.

Our old API had no versioning and broke every time we shipped a change. The rebuild gave every consumer a stable contract, and our integration bugs dropped almost to zero.
Ananya Kapoor
Head of Engineering, WooCommerce
They handed off an API codebase our own engineers actually enjoyed working in, with documentation that stayed accurate release after release.
Rohan Mehta
Founder, Meridian Boutique
Migrating our partner integrations off a legacy SOAP service felt daunting, but the transition was seamless and every partner stayed connected throughout.
Daniel Cruz
Engineering Lead, Harbor Freight
Transparent Pricing

Simple, honest pricing

No hidden fees, no surprises. Choose a package that fits your scope or talk to us for a custom quote.

Starter

₹ 25Konwards

Perfect for a single app or MVP that needs a clean, secure API layer, fast.

  • Up to 15 endpoints
  • Token-based authentication
  • Basic rate limiting
  • Unlimited revisions
  • Postman collection
  • Deployment + SSL included
  • 1 year free support
  • Third-party integrations
  • Role-based access control
  • Interactive API docs
Get Started
Most Popular

Growth

₹ 65Konwards

Ideal for growing products that need multiple consumers, integrations, and access control built in from day one.

  • Up to 50 endpoints
  • OAuth2 & role-based access
  • Unlimited revisions
  • Interactive OpenAPI docs
  • Third-party integrations
  • Automated test suite
  • Deployment + SSL included
  • 1 year free priority support
  • Legacy API migration

Get Started

Enterprise

Custom

For high-traffic platforms, legacy API migrations, or teams needing an embedded development team on retainer.

  • Unlimited endpoints
  • Full public/partner API platform
  • Legacy API migration
  • Unlimited revisions
  • Advanced caching & rate limiting
  • Custom monitoring dashboards
  • Deployment + SSL included
  • 1 year free priority support
  • Dedicated development lead
  • Monthly retainer available
Talk to Us
FAQ

Common questions

Anything else on your mind? Drop us a message at info@sitefiy.com

A custom REST API fits your exact data model and business logic instead of forcing your product to work around a generic schema, avoids per-request pricing that scales against you, and gives you full ownership of your backend with no vendor lock-in.

It depends on the project. A common pairing is Node.js or Laravel with PostgreSQL or MySQL, but we'll recommend the right combination during discovery based on your goals, existing systems, and expected traffic.

A focused API covering one or two core resource groups typically takes 4–6 weeks; a full multi-consumer platform usually takes 10–16 weeks depending on scope. We share a detailed timeline in our proposal before development begins.

Yes. We connect payment gateways, CRMs, shipping providers, and other third-party services directly into the API, and document each integration so your team can maintain it independently.

Yes. We migrate legacy APIs, including SOAP services and unversioned REST endpoints, to a modern architecture, either incrementally alongside the existing API or as a full rebuild, with a plan designed to avoid breaking existing consumers.

We handle the full platform, including interactive OpenAPI/Swagger documentation, a Postman collection, and an automated test suite, so your team can test and extend the API independently.

Yes. Upon receipt of final payment, full IP and the complete codebase transfer to you through your own Git repository, database, and hosting account, no vendor lock-in.

We offer optional retainers for continued endpoint development, integration upgrades, security patching, and bug fixes after launch. It's entirely opt-in, not bundled by default.
Ready to Begin

Let's build an API
that every consumer can rely on

Tell us about your data model and consumers and we'll get back within 24 hours with a tailored API development proposal, no commitment required.

Start a Projectinfo@sitefiy.com