Custom API Development CompanyDevelopment Company
We build APIs that connect your systems and scale with your users. Expect your first endpoint in week 2 with a fixed price.
IRPR builds custom APIs for web and mobile applications. We use FastAPI, Node.js, NestJS, and Go to create REST and GraphQL endpoints that handle millions of requests per day.
A typical custom API ships in 8-12 weeks with a fixed price from $60K to $200K. We handle authentication via Auth0, rate limiting with Redis, and monitoring through Datadog. Every API complies with OWASP security standards.
We work with CTOs who need to unify legacy systems, product managers launching a new app, startups building a SaaS MVP that relies on a data layer, and enterprise architects integrating third-party platforms like Salesforce or Stripe.
Types of software we ship.
REST API development
Stateless HTTP endpoints for CRUD operations. Uses Express.js or FastAPI with PostgreSQL. Ideal for mobile backends and web apps.
GraphQL API development
Single endpoint that fetches exactly what the client requests. Built with Apollo Server and Prisma. Reduces over-fetching by 40-60%.
Microservices API gateway
API gateway pattern using Kong or Traefik to route requests to multiple services. Includes rate limiting, auth, and logging.
Webhook API development
Real-time event triggers that push data to external systems. Uses Stripe webhooks, SendGrid, and custom endpoints with retry logic.
Third-party API integration
Connect your app to Salesforce, HubSpot, QuickBooks, or any REST/SOAP API. We handle OAuth2 flows and data mapping.
Public API development
Expose your product's functionality as a public API. Includes developer docs via Swagger, API keys, and usage analytics.
Internal API development
APIs for microservice to microservice communication. Uses gRPC or RabbitMQ for high throughput. Supports service mesh like Istio.
Real-time API (WebSocket)
Persistent connections for live updates. Built with Socket.io or AWS AppSync. Used for chat apps, live notifications, and dashboards.
We build for every business type.
Fintech
SaaS
Ecommerce
Healthcare (HIPAA)
Logistics & Travel
The business case for a custom API development company
Building your own API instead of using off-the-shelf integrations gives you full control over data, performance, and security.
A custom API eliminates vendor lock-in. When you own the endpoints, you can swap backend services without rewriting frontend code. At IRPR we design APIs with versioning via URL (v1, v2) and content negotiation so breaking changes never break your client apps.
We have shipped over 200 APIs across 50 countries. Clients report 30-50% faster time-to-market on new features because their front-end and mobile teams work against a stable API contract from week 2. Our average API handles 10x growth in traffic without refactoring.
IRPR vs generic development shops
Not all API projects are the same. Here is what sets IRPR apart from a typical dev agency.
Generic shops bid hourly and treat APIs as a side task. They often skip API documentation, neglect rate limiting, and deliver endpoints that crash under load. Their code lives in a black box with no automated tests or CI/CD pipeline.
IRPR treats APIs as first-class products. Every endpoint is documented in OpenAPI/Swagger, tested with Jest/Supertest, and deployed via GitHub Actions. We include rate limiting, retry logic, and health checks by default. You own the code and the repository from day one.
- Hourly billing with scope creep
- No API contract upfront
- No documentation or versioning
- No rate limiting or caching
- Untested endpoints
- You don't own the code
- Fixed price from Roadmap
- OpenAPI contract defined in week 2
- Swagger docs generated automatically
- Rate limiting with Redis, caching with CDN
- 95%+ test coverage, CI/CD pipeline
- Full code ownership in your repo
How we build your custom API in 4 phases
From idea to production in 8-12 weeks. Here is exactly what happens at each step.
We follow a four-phase process that turns your requirements into a production-grade API with documentation and deployment scripts.
What ships with every custom API project
No hidden handoffs. Every deliverable is listed in the contract and delivered on time.
You get a complete API package — not just endpoints. Every item below is written into your Roadmap and delivered by week 12.
- Source code in your private GitHub repository
- OpenAPI / Swagger specification in YAML
- CI/CD pipeline with GitHub Actions or GitLab CI
- Automated test suite (unit + integration) with >90% coverage
- API authentication (JWT, OAuth2, or API keys)
- Rate limiting and caching configuration
- Deployment scripts for AWS, GCP, or Azure
- Monitoring dashboard (Datadog logs, Sentry errors)
- Postman collection for manual testing
- Technical documentation and onboarding guide
What we ship in this practice.
Stripe-integrated payment API for a SaaS platform
Built a custom payment API that handles subscription billing, invoicing, and refunds. Reduced manual payment reconciliation by 12 hours per week. Tech stack: Node.js, Stripe Connect, PostgreSQL, Redis.
Real-time inventory API for an ecommerce marketplace
Developed a WebSocket API that pushes inventory updates to 500+ seller stores in real time. Cut order oversell errors by 95%. Tech stack: Go, AWS AppSync, DynamoDB, Elasticsearch.
HIPAA-compliant patient data API for telemedicine
Created a FHIR-based API that integrates with Epic EHR and sends lab results via webhooks. Passed HIPAA audit with no findings. Tech stack: FastAPI, Auth0, AWS HealthLake, Snowflake.
Third-party data aggregation API for logistics
Built an API that aggregates tracking data from UPS, FedEx, and DHL into a single endpoint. Reduced tracking lookup time by 70%. Tech stack: Python, Celery, Redis, AWS Lambda, MongoDB.
GraphQL API for a travel booking platform
Designed a GraphQL gateway that unifies hotel, flight, and car rental data from 8 legacy APIs. Cut front-end data fetching time by 60%. Tech stack: Apollo Server, Prisma, GraphQL Mesh, AWS Fargate.
Internal microservice API gateway for a media company
Deployed a Kong API gateway to route traffic between 15 internal microservices. Achieved sub-20ms latency and 99.99% uptime. Tech stack: Kong, Docker, Kubernetes, Prometheus, Grafana.
Why teams hire us.
Fixed price from the Roadmap
We quote a fixed price after a 2-week Roadmap phase. No hourly billing, no surprise invoices. Our on-time delivery rate is 98% across 200+ projects.
Senior engineers only
IRPR employs no juniors. Every developer has 8+ years of experience and has shipped production APIs for companies like Stripe and Slack. You get a senior architect assigned to every project.
API-first design process
We define your API contract before writing any code. This front-loading catches 90% of integration issues early. Your front-end team can mock endpoints in week 2.
Security and compliance built in
Every API includes OWASP TOP 10 protection, rate limiting, input sanitization, and TLS 1.3. We have built HIPAA-compliant and PCI-DSS compliant APIs — audited and certified.
Ongoing support and maintenance
After launch we offer a 30-day stabilization period with bug fixes included. Extended maintenance plans start at $2,000/month for monitoring, updates, and uptime guarantees.
Full code ownership
You own the code, the repository, the documentation, and the deployment pipeline from day one. No licensing fees, no vendor lock-in. You can take the code to any hosting provider.
Idea → Roadmap → Product → Release.
Every engagement runs through the same four-stage pipeline. Predictable by design.
Questions clients ask first.
Related services and industries.
Ready to build? Let's talk.
30-minute discovery call. No deck. We'll tell you honestly what it takes, how long, and how much.
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