Leading Custom API Development ServicesAPI Development
We build secure, scalable APIs that connect your systems. Get a fixed-price quote in 2 weeks.
IRPR builds high-performance custom APIs using Node.js, Express, FastAPI, PostgreSQL, and Redis. We design RESTful and GraphQL endpoints that handle millions of requests per day with built-in security and rate limiting.
Every project ships with full OpenAPI documentation, automated tests (Jest/PyTest), CI/CD pipelines on GitHub Actions, and 99.9% uptime SLAs. Timeline is 8-12 weeks for an MVP. Fixed pricing ranges from $80K to $250K depending on scope and compliance requirements (HIPAA, PCI-DSS, SOC 2).
Our buyers include: CTOs of SaaS companies needing a backend for user authentication and billing; fintech founders building payment processing APIs; healthcare IT directors migrating to FHIR-based patient data exchange; and ecommerce brands requiring real-time inventory and order management APIs.
Types of software we ship.
RESTful API Development
Stateless, cacheable APIs using Express.js and Django REST Framework. Ideal for mobile apps and third-party integrations.
GraphQL API Development
Flexible query language APIs using Apollo Server and Hasura. Clients control data shape, reducing over-fetching.
Microservices API Development
Decoupled services with API gateways (Kong, Nginx). Each service scales independently using Docker and Kubernetes.
API Integration Services
Connect third-party APIs like Stripe, Salesforce, HubSpot, and Twilio. We handle authentication, mapping, and error handling.
Webhook Development
Real-time event-driven APIs that push data to your systems. Built with Serverless (AWS Lambda) and Redis for delivery.
Real-time API (WebSocket)
Bidirectional streaming APIs for chat, live dashboards, and IoT. Built on Socket.IO or MQTT with horizontal scaling.
API Gateway Development
Centralized API management with Kong, AWS API Gateway, or Tyk. Includes rate limiting, caching, and routing.
API Security & Authentication
OAuth 2.0, JWT, and SAML implementations. Auth0 or Keycloak integration with multi-factor authentication.
We build for every business type.
E-commerce
Fintech
Healthcare
SaaS
Enterprise
Why Leading Custom API Development Services Matter
A well-architected API is the backbone of modern software. It connects users, data, and services without friction.
IRPR has delivered over 200 custom API projects across fintech, healthcare, ecommerce, and SaaS. Each API is designed for high concurrency, minimal latency, and easy extension.
We use automated load testing (k6, Locust) to verify throughput before deployment. 98% of our APIs hit performance SLAs on day one.
How Our API Development Differs from Generic Shops
Most API projects fail due to vague requirements and hourly billing. We fix that.
Generic dev shops hand you an API with no documentation, no tests, and no ownership docs. You are left debugging their work.
IRPR builds APIs like we own them: full documentation, automated CI/CD, and code you can take anywhere.
- Vague, hand-wavy requirements
- Hourly billing that never ends
- No security review or vulnerability scan
- Junior or remote developers with no accountability
- No post-launch support
- Unclear code ownership – you may not own all IP
- Fixed price after a 2-week Roadmap phase
- All senior engineers with 7+ years experience
- Compliance-first: HIPAA, PCI-DSS, SOC 2 built in
- Full code ownership from day one
- 30 days free monitoring and bug fixes after launch
- CI/CD, Sentry, Datadog monitoring included
Our Custom API Development Process
We turn your idea into a documented, scalable API in 8-12 weeks. Here is how.
Every project starts with a Roadmap phase where we define endpoints, data models, and compliance requirements. You get a fixed price and a clear timeline before any code is written.
Our process is divided into four stages, each with a specific deliverable and a go/no-go decision point for you.
What Ships With Every Custom API from IRPR
You get more than endpoints. Every project includes the following deliverables by default.
- Source code in your Git repository (GitHub, GitLab, Bitbucket)
- OpenAPI 3.0 documentation with examples
- Automated unit and integration tests (Jest, PyTest)
- CI/CD pipeline using GitHub Actions
- Sentry error tracking with alerts
- Datadog monitoring dashboard for latency and throughput
- Kubernetes deployment manifests (Helm charts)
- OAuth 2.0 / JWT authentication implementation
- Rate limiting (Redis-based, per endpoint)
- API versioning strategy (URL path or header)
What we ship in this practice.
Payment Gateway API for Fintech Startup
A New York-based fintech needed a PCI-DSS compliant payment API. We built endpoints using Node.js, Stripe Connect, and PostgreSQL. The system now processes $2M monthly, reducing transaction failure rate by 30%.
Real-Time Inventory API for Ecommerce Brand
An ecommerce brand with 10 warehouses needed real-time stock sync. We built a GraphQL API with Kafka and Redis. Inventory updates now propagate in under 2 seconds, and manual data entry dropped from 2 hours to 5 minutes per day.
Patient Data API for Telehealth Platform
A telehealth startup needed a HIPAA-compliant FHIR API. We used FastAPI, AWS HealthLake, and Auth0. The API handles 50K patient records and 10K daily requests with zero PHI breaches since launch.
Real-Time Chat API for SaaS Collaboration Tool
A SaaS company wanted WebSocket-based chat for 10K concurrent users. We built on Socket.IO, Redis Pub/Sub, and MongoDB. Latency stayed under 100ms even during peak usage, increasing user retention by 22%.
CRM Integration API for Real Estate Platform
A real estate firm needed to sync leads from MLS to Salesforce. We built a RESTful API with Salesforce Bulk API and scheduled jobs (Celery with Redis). Lead capture time dropped from 1 hour to 2 minutes, conversion rate rose 25%.
IoT Sensor API for Manufacturing Floor
A manufacturer needed to collect 1M sensor events per day from factory equipment. We built an MQTT-based API with TimescaleDB and Node-RED. Downtime detection improved from 2 hours to under 1 minute, saving $500K annually in lost production.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote after a 2-week Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges.
Senior engineers only
All developers have 7+ years of experience building APIs. We do not use junior or offshore teams. Average tenure at IRPR is 5 years.
Compliance built in
HIPAA, PCI-DSS, and SOC 2 compliance are included in every project from the start. We use encrypted databases (AES-256), audit logs, and access controls.
Code you own, free and clear
You own 100% of the source code, documentation, and IP from day one. No licensing fees, no vendor lock-in.
30 days free post-launch support
After launch, we monitor your API with Sentry and Datadog for 30 days at no extra cost. Bug fixes and performance tuning are included.
8-12 week MVP guarantee
We deliver a production-ready API with documentation and tests in 8-12 weeks. 98% of our projects meet or beat this timeline.
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.