Experienced Custom API Development AgencyAPI Development
We build production APIs in 8-12 weeks. REST, GraphQL, gRPC with fixed pricing and full compliance.
IRPR is an experienced custom API development agency. We design and build REST APIs with Express.js and FastAPI, GraphQL APIs with Apollo, and gRPC services with Go. Every API includes auto-generated OpenAPI docs and Postman collections.
A typical custom API ships in 8-12 weeks with a fixed price between $80K and $250K. We handle HIPAA for healthcare, PCI-DSS for fintech, and SOC 2 for SaaS. Our APIs run on AWS ECS or GCP Cloud Run with 99.9% uptime SLA.
CTOs hire us when their in-house team lacks API security expertise. Product owners hire us to build APIs for a new SaaS MVP. Tech leads hire us to replace a legacy monolithic backend with microservices.
Types of software we ship.
REST API Development
Stateless JSON APIs with OpenAPI 3.0 specs. Built with Express.js, FastAPI, or Spring Boot. Includes rate limiting and OAuth 2.0.
GraphQL API Development
Single endpoint APIs with Apollo Server or Hasura. Supports real-time subscriptions and schema stitching from multiple data sources.
gRPC API Development
High-performance binary APIs using Protocol Buffers. Built with Go or Node.js. Ideal for internal microservice communication.
Third-Party API Integration
Connect your app to Stripe, Salesforce, HubSpot, Twilio, or any REST/SOAP endpoint. Includes error handling and retry logic.
API Gateway Development
Centralized gateways with Kong or AWS API Gateway. Handles authentication, rate limiting, caching, and request transformation.
Webhook System Development
Event-driven webhook delivery with retries, idempotency keys, and logging. Built with Express.js or AWS Lambda.
Microservice API Development
Decoupled APIs with Docker and Kubernetes. Each service owns its database. Uses message queues like RabbitMQ or SQS.
Real-Time API Development
WebSocket or SSE based APIs for live data. Built with Socket.io or AWS AppSync. Used for chat, notifications, and live dashboards.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics
Why hire an experienced custom API development agency
Building a production API is more than writing endpoints. It takes security, monitoring, and documentation.
IRPR has shipped 200+ APIs for clients in 50 countries. We write integration tests with Jest and Supertest, deploy with GitHub Actions, and monitor with Datadog. Every API gets a Grafana dashboard for latency and error rates.
We enforce API versioning from day one using URL prefixes (v1, v2) or headers. We use rate limiting with Redis to prevent abuse. Our APIs pass OWASP Top 10 security scans before they go live.
How IRPR differs from other API development agencies
Most agencies bill hourly and deliver late. We do the opposite.
We quote a fixed price after a 2-week Roadmap phase. That price covers everything: design, build, test, deploy, and documentation. No hourly rates, no surprise invoices.
We also handle compliance. Our APIs use encryption at rest (AES-256) and in transit (TLS 1.3). We write audit logs for HIPAA and SOC 2. We scan dependencies with Snyk every build.
- Hourly billing with no cap
- No OpenAPI docs
- No load testing
- No security audit
- No monitoring setup
- No post-launch support
- Fixed price from Roadmap
- OpenAPI 3.0 docs auto-generated
- k6 load tests at 1000+ RPS
- OWASP ZAP security scan
- Datadog + Grafana monitoring
- 2 weeks post-launch support
Our API development process in 4 phases
We follow a repeatable process to ship APIs on time and on budget.
Every project starts with a 2-week Roadmap phase. We define endpoints, data models, auth strategy, and deployment plan. You get a fixed price and a timeline before we write code.
The Build phase runs 6-10 weeks depending on complexity. We ship in 2-week sprints with demo at the end of each sprint. You see working endpoints early and can adjust priorities.
What ships with every custom API
You get more than just code. Every API comes with production-ready artifacts.
We deliver source code in your private GitHub repo. We include a CI/CD pipeline with GitHub Actions that runs tests, lints, and deploys on merge to main. We configure Sentry for error tracking and Datadog for performance monitoring.
Documentation is auto-generated from OpenAPI specs. You get a hosted Swagger UI and a Postman collection with example requests. We also write a runbook with deployment steps, rollback procedures, and scaling guidelines.
- Source code in your GitHub repo
- CI/CD pipeline with GitHub Actions
- OpenAPI 3.0 spec with Swagger UI
- Postman collection with example requests
- Sentry error tracking
- Datadog dashboard for latency and errors
- k6 load test scripts
- OWASP ZAP security scan report
- Dockerfile and docker-compose.yml
- Runbook with deployment and rollback steps
What we ship in this practice.
HIPAA compliant EHR integration API
Built a REST API that connects a telemedicine app to Epic EHR. Handles FHIR R4 resources. Reduced data entry time by 12 hours per week. Tech stack: Express.js, PostgreSQL, AWS ECS, FHIR.
PCI-DSS payment processing API
Developed a tokenization API for a fintech startup. Processes 50,000 transactions per month. Passed PCI SAQ D audit. Tech stack: FastAPI, Stripe Connect, AWS KMS, Redis.
Real-time inventory sync API
Created a WebSocket API that syncs inventory across 12 warehouses in real time. Reduced stockouts by 30%. Tech stack: Socket.io, MongoDB, AWS Lambda, DynamoDB.
Multi-tenant SaaS billing API
Built a GraphQL API for a B2B SaaS platform. Handles 10,000+ tenants with usage-based billing. Reduced billing errors by 40%. Tech stack: Apollo Server, PostgreSQL, Stripe, Redis.
MLS data integration API
Developed a REST API that ingests MLS listings from 15 different sources. Normalizes data into a single schema. Reduced listing sync time from 4 hours to 15 minutes. Tech stack: Node.js, MongoDB, AWS SQS, Elasticsearch.
FERPA compliant student data API
Built a REST API for a learning management system. Handles student records, grades, and attendance. Passed FERPA compliance audit. Tech stack: Django REST Framework, PostgreSQL, AWS RDS, Celery.
Why teams hire us.
Fixed price from week 2
We quote a fixed price after the 2-week Roadmap phase. No hourly billing. No scope creep charges. The price you see is the price you pay.
Compliance built in
We build HIPAA, PCI-DSS, SOC 2, and FERPA compliant APIs. We use encryption at rest (AES-256) and in transit (TLS 1.3). We write audit logs for every request.
200+ APIs shipped
We have built 200+ production APIs for clients in 50 countries. Our APIs handle millions of requests per day. We know what breaks and how to prevent it.
Full documentation included
Every API ships with OpenAPI 3.0 specs, Swagger UI, Postman collections, and a runbook. Your team can start using the API on day one.
Load tested at 1000+ RPS
We run k6 load tests before launch. We test at 1000+ requests per second and measure p99 latency. We optimize database queries and cache aggressively.
You own everything
We write clean, modular code. You own the source code, the documentation, and the infrastructure. There are no licensing fees or lock-in contracts.
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.