Professional Custom API Development TeamAPI Development
We build APIs that integrate your systems in 12 weeks. Fixed price, senior engineers, full documentation.
IRPR builds custom APIs for software companies that need to connect internal tools, expose data to partners, or power mobile apps. We work with Node.js, Python, Go, PostgreSQL, Redis, and AWS/GCP to deliver production-ready endpoints.
Every professional custom API development project ships in 8-12 weeks with a fixed price range of $80,000 to $250,000. We handle compliance requirements like HIPAA, PCI-DSS, and SOC 2, including audit logging and encryption.
Our clients are CTOs who need a secure integration layer with Salesforce, product managers scaling a SaaS platform from 10 to 10,000 API calls per second, and startups building an API-first product that must ship in under 3 months.
Types of software we ship.
REST API Development
Build a resource-oriented API with JSON responses, rate limiting, and token-based auth using Express or Django REST Framework.
GraphQL API Development
Deliver a flexible query layer with Apollo Server, real-time subscriptions, and resolver caching for frontend teams.
Webhook Integration API
Receive and deliver real-time events from Stripe, Slack, or HubSpot with idempotency, retries, and logging.
Real-Time API (WebSocket)
Build a low-latency event stream using Socket.IO or WebSocket protocol for live dashboards or chat apps.
B2B Integration API
Connect your platform to ERP systems like NetSuite or SAP with EDI-style payloads and OAuth2 authentication.
Payment Gateway API
Wrap Stripe or Adyen endpoints with idempotency, 3D Secure, and PCI-DSS compliant tokenization.
Data Aggregation API
Aggregate data from 10+ third-party sources (CRMs, databases, file shares) into a single GraphQL or REST endpoint.
Microservice API Gateway
Deploy a Kong or Envoy gateway with rate limiting, JWT validation, and canary releases for your internal services.
We build for every business type.
Finance
Healthcare
Ecommerce
SaaS
Logistics
Results from 200+ custom API builds
Every API we ship is designed for scale, security, and developer happiness.
Our professional custom API development team has delivered over 200 APIs across 50 countries. Average build time is 12 weeks, and 98% of projects finish on schedule. We start every engagement with a fixed price that covers discovery, roadmap, build, and release.
APIs we build handle an average of 50,000 requests per day in production. Clients see a 60% reduction in manual data entry when we replace CSV uploads with REST endpoints. Uptime is guaranteed at 99.9% with monitoring via Datadog and PagerDuty.
The difference between IRPR and a generic dev shop
Most agencies bill hourly and deliver incomplete APIs. We do the opposite.
Generic dev shops charge by the hour, push ambiguous timelines, and deliver APIs without documentation or monitoring. You end up with a broken endpoint and no contract to fix it.
IRPR gives you a fixed price upfront based on a 2-week Roadmap phase. We deliver a documented, tested, monitored API with full ownership. If we miss a milestone, you don't pay for that phase.
- Hourly billing with no cap
- No written API contract
- No OpenAPI/Swagger docs
- No rate limiting or auth
- No CI/CD or monitoring
- Slow email-only support
- Fixed price per phase
- 2-week Roadmap with wireframes and data model
- OpenAPI/Swagger docs for every endpoint
- Rate limiting, JWT, and OAuth2 wired in
- GitHub Actions CI/CD + Datadog monitoring
- 24-hour response on Slack and email
How we build your custom API in 4 phases
From idea to release, every phase has a clear deliverable and a fixed price.
Phase 1 (Discovery) identifies the data sources, workflows, and consumers. Phase 2 (Roadmap) produces an OpenAPI spec, data model ERD, and fixed quote. Phase 3 (Sprints) delivers incremental endpoints every 1-2 weeks. Phase 4 (Release) includes load testing, deployment, and monitoring setup.
By the end of Phase 2, you know exactly what you're getting and for how much. No surprises. We use Stripe for payments and Sentry for error tracking from sprint one.
What ships with every professional custom API
Every API includes these assets by default. No extra cost.
We don't just write code. Every IRPR API project delivers a complete production kit. Your team can start using the API the day we hand it over, with no missing pieces.
From source code to monitoring dashboards, everything is included in the fixed price. You own all deliverables, and we provide a 30-day post-release support window.
- Source code in your private GitHub/GitLab repo
- OpenAPI/Swagger 3.0 specification
- Postman collection with example requests
- CI/CD pipeline on GitHub Actions
- Unit tests with 90%+ coverage (Jest, Mocha)
- Integration tests for each endpoint
- Deployment script for AWS ECS or Google Cloud Run
- Sentry error tracking
- Datadog dashboard with latency and error metrics
- Architecture diagram and API usage guide
What we ship in this practice.
Financial Data Aggregation API
Aggregated transactions from 10 banking APIs into a single REST endpoint. Reduced integration time from 8 hours to 90 minutes. Stack: Node.js, Redis, Express, Plaid.
Healthcare FHIR API
Built a FHIR R4 compliant API for a telehealth platform, handling patient records and appointment scheduling. Achieved HIPAA audit pass in 2 weeks. Stack: Python, FastAPI, PostgreSQL, AWS.
Ecommerce Product Sync API
Synced inventory and prices across Shopify, WooCommerce, and Amazon. Cut manual data entry by 12 hours per week. Stack: GraphQL, Apollo Server, Redis, Stripe.
Real Estate MLS API
Provided real-time property listings from 3 MLS sources via a single GraphQL endpoint. Reduced data latency from 24 hours to 5 minutes. Stack: Ruby on Rails, Sidekiq, PostgreSQL.
SaaS Webhook Handler
Built an idempotent webhook receiver for a CRM platform that processes 200,000 events daily from HubSpot and Salesforce. Stack: Go (Gin), RabbitMQ, MongoDB.
Logistics Tracking API
Integrated live tracking data from 5 carriers (UPS, FedEx, DHL, USPS, Canada Post) into a single REST endpoint. Improved tracking accuracy from 85% to 99.5%. Stack: Node.js, Redis, Express, AWS Lambda.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. 98% of our projects finish on budget.
Senior engineers only
Your professional custom API development team consists of engineers with 7+ years of experience. We don't assign juniors or freelancers. Average tenure at IRPR is 8 years.
8-12 week MVP delivery
From kickoff to production, most APIs ship in 8-12 weeks. For example, a recent fintech API with 15 endpoints was live in 9 weeks. We use 1-week sprints to keep momentum.
Full ownership from day one
We place source code in your GitHub repo on day one. You own the IP, the code, the documentation, and the deployment scripts. No license fees, no restrictions.
Compliance by default
HIPAA, PCI-DSS, SOC 2, and FERPA are built into our process from the Roadmap phase. We include audit logging, encryption at rest and in transit, and annual penetration testing.
24-hour support window
After release, you get 24-hour response time on Slack and email for 30 days. We help your team onboard and handle any edge cases. Extended maintenance contracts are available at $2,000/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.