best custom api development agencycustom api
We build secure, scalable APIs that connect your systems. Ship in 8-12 weeks with a fixed price.
IRPR is the best custom API development agency for companies that need secure, production-grade APIs. We use Node.js, Python, Go, and Java with frameworks like Fastify, Express, and Apollo Server to build REST, GraphQL, and gRPC APIs.
Every project ships in 8-12 weeks with a fixed price starting at $80K and going up to $250K. We handle HIPAA, PCI-DSS, and SOC 2 compliance out of the box. Your code is in your repo from day one.
CTOs hire us to replace outdated integration layers. Product owners hire us to build API-first platforms. Engineering leads hire us to create developer portals with authentication, rate limiting, and monitoring.
Types of software we ship.
REST API development
Stateless, cacheable endpoints for CRUD operations. Uses OpenAPI 3.0 specs and JSON:API standards.
GraphQL API development
Query language for efficient data fetching. Built with Apollo Server, Prisma, and schema stitching.
gRPC API development
High-performance RPC framework for microservices. Uses Protocol Buffers and HTTP/2 for low latency.
WebSocket API development
Real-time, bidirectional communication for chat, live updates, and streaming data. Uses Socket.IO or native WebSockets.
Third-party API integration
Connect to Stripe, Salesforce, HubSpot, Slack, and 200+ other services. Includes webhook handling and retry logic.
API gateway development
Single entry point for multiple services. Implements rate limiting, authentication, and request routing with Kong or AWS API Gateway.
Internal API development
Private APIs for microservice communication. Includes service discovery, circuit breakers, and distributed tracing with Jaeger.
API security and auth
OAuth 2.0, JWT, API keys, and role-based access control. Includes encryption at rest and in transit with TLS 1.3.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics
Why IRPR is the best custom API development agency
We have shipped 200+ products across 50 countries with a 98% on-time delivery rate.
Our APIs handle over 10 million requests per day for clients in healthcare, fintech, and ecommerce. We use automated load testing with k6 and artillery to guarantee 99.9% uptime.
Every API comes with OpenAPI documentation, Postman collections, and integration tests. We deploy on AWS, GCP, or Azure with CI/CD pipelines using GitHub Actions or GitLab CI.
The difference between IRPR and other API agencies
Most agencies bill hourly and deliver late. IRPR works differently.
We give you a fixed price after a 2-week Roadmap phase. No hourly billing, no surprise invoices. You know the cost before we write a line of code.
Our senior engineers have 10+ years of experience each. We use pair programming and code reviews to catch bugs early. Everything is in your repo from day one.
- Hourly billing with no cap
- Junior developers on your project
- No compliance expertise
- Late delivery is common
- No documentation included
- Code stays on their servers
- Fixed price after Roadmap
- Senior engineers only (10+ years)
- HIPAA, PCI-DSS, SOC 2 built in
- 98% on-time delivery
- OpenAPI docs and Postman collections
- Code in your repo from day one
How we build your custom API in 8-12 weeks
Our process has four phases. Each phase has a clear deliverable.
We start with a 2-week Roadmap where we define endpoints, data models, and security requirements. You get a fixed price and a timeline before we build anything.
The Product phase takes 4-6 weeks. We build the API with automated tests and deploy to staging. The Release phase includes load testing, security audit, and production deployment.
What ships with every custom API
Every project includes these deliverables by default. No extra charges.
- Source code in your private GitHub repo
- CI/CD pipeline on GitHub Actions or GitLab CI
- OpenAPI 3.0 specification document
- Postman collection with example requests
- Unit tests and integration tests (90%+ coverage)
- Load test results from k6
- Sentry error tracking and logging
- Deployment playbook for AWS, GCP, or Azure
- Admin dashboard for API usage monitoring
- Security audit report (OWASP top 10)
What we ship in this practice.
Healthcare patient data API
Built a HIPAA-compliant API for a telemedicine platform. Reduced patient data retrieval time from 12 seconds to 200ms. Tech stack: Node.js, Fastify, PostgreSQL, FHIR standard.
Fintech payment gateway API
Developed a PCI-DSS Level 1 compliant payment API for a lending startup. Processed $50M in transactions in the first 6 months. Tech stack: Go, gRPC, Stripe Connect, AWS KMS.
Ecommerce inventory sync API
Created a real-time inventory sync API for a multi-store retailer. Reduced overselling by 95% and saved $200K in refunds per year. Tech stack: Python, FastAPI, Redis, Shopify API.
SaaS subscription billing API
Built a billing API with usage-based pricing for a B2B SaaS company. Cut billing errors by 100% and reduced dunning costs by 40%. Tech stack: Node.js, Express, Stripe, MongoDB.
Real estate MLS data API
Developed a GraphQL API for a real estate platform that aggregates MLS data from 50+ sources. Reduced API response time from 3 seconds to 400ms. Tech stack: Apollo Server, PostgreSQL, Elasticsearch.
Logistics tracking API
Created a real-time tracking API for a logistics company. Reduced customer support calls by 60% with live delivery status webhooks. Tech stack: Go, WebSockets, Redis, Kafka.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote after the 2-week Roadmap phase. No hourly billing, no surprise invoices, no scope creep charges. You know the cost upfront.
Senior engineers only
Every engineer at IRPR has 10+ years of experience. No juniors, no outsourcing. Your API is built by someone who has shipped production systems at scale.
Compliance built in
We build HIPAA, PCI-DSS, and SOC 2 compliance into every API from day one. We handle encryption, audit logs, and access controls so you pass audits faster.
Code ownership from day one
Your code lives in your GitHub repo from the first commit. You own everything. No licensing fees, no vendor lock-in, no surprises when you want to change providers.
8-12 week delivery
We ship every project in 8-12 weeks. Our process is optimized for speed without cutting corners. 98% of our projects deliver on time.
Post-launch support included
Every project includes 30 days of post-launch support. We monitor your API, fix bugs, and help your team take over. After that, we offer retainer plans starting at $5K/month.
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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