Custom API Development AgencyAPI Development
We build production-ready APIs for your business. Senior engineers ship REST, GraphQL, and microservices in 8 to 12 weeks.
IRPR builds custom APIs for web and mobile applications. We use Node.js, Python, Go, PostgreSQL, and cloud-native tools like AWS Lambda and Docker.
We ship a working MVP in 8 to 12 weeks with fixed pricing starting at $80K for complex integrations. Every API meets HIPAA, PCI-DSS, or SOC 2 compliance if required.
Our clients include SaaS founders needing a public API, ecommerce brands integrating payment gateways, healthcare platforms connecting EHR systems, and logistics companies building real-time tracking APIs.
Types of software we ship.
REST API Development
Build stateless, cacheable RESTful endpoints using Express or FastAPI with full OpenAPI documentation.
GraphQL API Development
Create flexible GraphQL schemas using Apollo or Relay for complex data queries and real-time subscriptions.
Microservices API Architecture
Design event-driven microservices with message brokers like RabbitMQ and container orchestration via Kubernetes.
API Integration Services
Connect your platform to third-party services such as Stripe, Twilio, HubSpot, or Salesforce using custom adapters.
Real-Time API (WebSocket)
Implement bidirectional, low-latency communication using WebSockets and Socket.IO for live dashboards and chat.
Data API & ETL Pipeline
Expose aggregated data from multiple sources via dedicated APIs, backed by Airflow pipelines and Redis caching.
Mobile API Backend
Build a mobile-first API layer with Firebase Cloud Functions or AWS AppSync to support iOS and Android apps.
Third-Party API Wrapper
Create a clean, versioned wrapper around external APIs with retry logic, caching, and rate limiting built in.
We build for every business type.
SaaS companies
ecommerce and retail
healthcare and life sciences
fintech and payments
logistics and transportation
Why companies choose a custom API development agency
Off-the-shelf APIs rarely fit your exact business logic or data models.
When you buy a generic API, you inherit its limitations. You cannot modify the schema, add custom authentication, or optimize for your specific load patterns. A custom API development agency builds endpoints that match your database, workflows, and compliance needs exactly.
IRPR has shipped over 200 custom APIs for clients in 50 countries. Each API is designed with versioning, rate limiting, and monitoring from day one. We use tools like Postman for testing, Swagger for documentation, and Datadog for performance tracking.
Custom API agency vs generic development shop
Not all agencies deliver APIs that scale with your users or data.
Most agencies build APIs as an afterthought, often with no design docs, no tests, and no monitoring. You end up with endpoints that break under load and require constant fixes. IRPR takes a different approach.
We write API contracts before writing code. Every endpoint gets a unit test and integration test. We deploy to AWS or GCP with auto-scaling, and we monitor latency and error rates from day one.
- No API design doc
- No testing strategy
- Hard-coded endpoints
- No monitoring
- Single developer bottleneck
- Hourly billing surprises
- API design doc reviewed with you
- Test-driven development with Postman
- Versioned endpoints with Swagger
- Sentry and Datadog monitoring
- Team of senior engineers
- Fixed price from week 2
How we build your custom API in 12 weeks
We follow a repeatable 4-phase process that de-risks every step.
Each phase has clear deliverables and a sign-off gate. You never wonder what comes next or how much it will cost. The process works for REST, GraphQL, and microservice architectures alike.
What ships with your API
Full ownership from day one. You get every asset the team produces.
Every IRPR API project delivers a complete package, not just code. You can take it to any other team or run it yourself without starting over.
- Source code in your GitHub repo
- CI/CD pipeline with GitHub Actions
- API documentation via Swagger / OpenAPI
- Authentication and authorization (JWT, OAuth 2.0)
- Rate limiting and caching (Redis)
- Error logging with Sentry
- Performance monitoring with Datadog
- Unit and integration tests (Jest, Mocha)
- API versioning strategy
- Deployment scripts for AWS or GCP
What we ship in this practice.
Payment gateway integration API
A fintech startup needed a custom API to aggregate Stripe, PayPal, and local bank transfers. We built a unified REST API with idempotency keys, reducing failed transactions by 40%. Tech stack: Node.js, PostgreSQL, Stripe API.
Real-time vehicle tracking API
A logistics company required live GPS updates from 2,000 trucks. We built a WebSocket API using Socket.IO and Redis pub/sub, cutting dashboard load time from 8 seconds to under 200ms. Tech stack: Python, AWS Lambda, DynamoDB.
Patient data exchange API
A healthcare platform needed to share records with 5 EHR systems while staying HIPAA compliant. We built a FHIR-based REST API with audit logs and encryption at rest. Tech stack: Java Spring Boot, HAPI FHIR, PostgreSQL.
Product catalog API for an ecommerce brand
An online retailer wanted a searchable, filterable product feed for their mobile app. We built a GraphQL API with Algolia search indexing, improving product discovery time by 60%. Tech stack: Ruby on Rails, GraphQL, Redis.
CRM integration API for a SaaS platform
A B2B SaaS company needed two-way sync with Salesforce and HubSpot. We built a microservice with webhooks, conflict resolution, and field mapping. The API processes 500,000 records daily without errors. Tech stack: Go, Kafka, MongoDB.
Property listing API for a real estate portal
A real estate aggregator required a high-performance API to query MLS data from multiple regions. We built a REST API with Elasticsearch and geospatial indexing, cutting query time from 3 seconds to 150ms. Tech stack: Python, Elasticsearch, PostGIS.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote during the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. If you add features, we adjust the quote before we build them.
Senior engineers only
All IRPR engineers have 10+ years of experience. No junior developers, no offshore teams. Your API is built by someone who has shipped production systems for companies like Twilio and Stripe.
12-week delivery guarantee
We ship a working MVP in 8 to 12 weeks. If we miss the deadline, you pay nothing for the extra time. This guarantee has held for 98% of our projects.
Full code ownership
You own the source code, the CI/CD scripts, and the documentation from day one. There is no vendor lock-in. You can deploy anywhere or hand it to your own team.
Compliance built in
We embed HIPAA, PCI-DSS, SOC 2, and GDPR requirements into the API design. Our audits have passed on the first attempt for over 50 compliance checks.
Post-launch support included
Every project includes 30 days of post-launch support with 4-hour response time. We monitor error rates, latency, and uptime, and we patch any issues that arise.
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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