Senior API Development FirmAPI Development
We build production-grade APIs for data-heavy systems. Get a scalable, documented API in 8-12 weeks with a fixed price.
A senior API development firm builds the glue between your frontend, databases, and third-party services. IRPR uses Node.js, Python, Go, and TypeScript on top of PostgreSQL, MongoDB, and Redis to design RESTful and GraphQL APIs that handle millions of requests per day.
Every API ships with auto-generated OpenAPI documentation, rate limiting, authentication (OAuth2 / JWT), and CI/CD pipelines. A typical project runs 8-12 weeks and costs between $80K and $250K depending on complexity. Compliance standards like HIPAA, PCI-DSS, and SOC 2 are baked in from the start.
We work with CTOs launching a SaaS product that needs a multi-tenant API, product owners replacing a legacy monolith with microservices, and founders building an integration marketplace. Each client has a clear API contract before code is written.
Types of software we ship.
REST API Development
Stateless, resource-oriented APIs using Express.js or FastAPI. Includes pagination, filtering, and versioning.
GraphQL API Development
Single endpoint with Apollo Server or Hasura. Reduces over-fetching and under-fetching of data.
Microservices API Gateway
Kong or Envoy gateway that routes requests to dozens of internal services. Handles auth, rate limits, and logging.
Payment API Integration
Stripe, Braintree, or Adyen API integrations with webhook handling, idempotency keys, and PCI-DSS compliance.
Third-Party API Aggregator
Unified layer on top of Salesforce, HubSpot, Shopify, or QuickBooks APIs. Normalizes data and caches responses.
Real-Time API (WebSocket)
Low-latency WebSocket or Server-Sent Events API using Socket.io or Redis pub/sub. Built for live dashboards and notifications.
Internal API (B2B)
Private APIs for your own frontend teams or mobile apps. Includes API keys, audit logs, and usage analytics.
File Upload API
Signed URL uploads to S3 or GCS with resumable uploads, image resizing, and malware scanning via ClamAV.
We build for every business type.
Enterprise Software
Financial Services
Healthcare & Life Sciences
Ecommerce & Retail
Logistics & Supply Chain
Why Hire a Dedicated Senior API Development Firm
Building an API that scales to production traffic requires more than writing endpoints.
IRPR has shipped over 200 API-powered products across 50 countries. Our typical API handles 10 million requests per month with 99.9% uptime. We enforce rate limiting (token bucket algorithm), authentication (JWT with refresh tokens), and query optimization (N+1 prevention, database indexing).
When you hire a senior API development firm, you get a team that codes the API, writes integration tests, sets up monitoring (Datadog, Sentry), and documents everything in Postman or Swagger. The result is an API that your frontend and mobile teams can consume without context switching.
How We Differ from Generic API Developers
Not all API firms deliver the same quality. Here is what changes when you hire IRPR.
Generic dev shops often deliver an API that works on your local machine but fails under load. They skip rate limiting, use no caching, and write no integration tests. The code ships without documentation, and the first time you hit a 500 error, you are on a Slack call trying to debug.
IRPR treats your API as a product. We design the schema first, write integration tests before endpoints, and deploy behind a CDN with caching headers. Every API has health check endpoints, structured logging (JSON logs to ELK stack), and a runbook for incident response.
- No API contract before coding
- No rate limiting or throttling
- No integration tests
- No auto-generated docs
- No monitoring or alerting
- Unclear ownership of code
- OpenAPI spec approved before writing code
- Rate limiting with token bucket algorithm
- Integration tests that run in CI on every PR
- Swagger/Postman docs auto-published
- Datadog dashboards + PagerDuty alerts
- Full IP and source code ownership
Our API Development Process in 4 Phases
We follow a structured process so every API is predictable, secure, and scalable.
Every API project starts with a 1-week discovery phase where we map the data model, agree on authentication strategy (OAuth2, API keys, or JWT), and define route structure. The output is an OpenAPI spec that both teams sign off on.
From there we build in 2-week sprints. After each sprint you see a deployed version on a staging URL. By week 6 the core routes are ready. Week 8 through 12 handle edge cases, webhooks, and performance tuning.
Everything That Ships with Your API
You get more than a set of endpoints. Every deliverable is production-ready.
IRPR ensures you walk away with a complete API product. That includes the source code, infrastructure as code (Terraform), CI/CD pipelines, monitoring dashboards, and a runbook for on-call engineers. Nothing is left for you to build later.
We also provide a 30-day post-launch support period where we fix any bugs or respond to incidents. After that, we can transition to a maintenance retainer or you take over — the code is yours.
- Source code in your GitHub/GitLab repo
- OpenAPI (Swagger) documentation
- CI/CD pipeline with GitHub Actions or GitLab CI
- Infrastructure as code (Terraform) for AWS/GCP/Azure
- Datadog dashboard with request latency and error rate
- Sentry error tracking for API exceptions
- Postman collection for manual testing
- Deployment runbook with rollback steps
- Load test results from k6
- 30-day post-launch support window
What we ship in this practice.
Ecommerce Product API for a Subscription Box Startup
Built a REST API in Node.js and PostgreSQL that served product catalog, inventory, and subscription management. Reduced product data sync time from 4 hours to 3 minutes using Redis caching. Integrated Stripe for recurring billing webhooks.
Real-Time Fleet Tracking API for a Logistics Company
Developed a WebSocket API using Go and Redis pub/sub that pushed GPS coordinates every 2 seconds. Handled 50,000 concurrent connections with 200ms latency. Replaced a polling-based system that cost $1,200/month in database reads.
Healthcare FHIR API for a Telehealth Platform
Built a FHIR-compliant API with Python and FastAPI for patient records, appointments, and prescriptions. Passed HIPAA audit in 2 weeks. Enabled 10 clinics to share data in real time.
Payment Aggregator API for a Fintech Startup
Created a unified API layer over Stripe, Braintree, and Adyen with idempotent retries and PCI-DSS scoped data. Reduced integration time for new payment gateways from 6 weeks to 3 days. Handled $2 million in monthly transaction volume.
MLS Data API for a Real Estate Platform
Designed a GraphQL API in Node.js and Apollo that aggregated MLS data from 12 regional sources. Cached property data with Redis and reduced average query time from 8 seconds to 400ms. Supported 100+ realtor partners.
Course Enrollment API for an EdTech Platform
Developed a REST API with Django REST Framework that handled student enrollment, grade submission, and payment processing. Integrated with Canvas LMS via their API. Reduced manual data entry by 8 hours per week per school.
Why teams hire us.
APIs designed by senior engineers, not juniors
Every IRPR team member has 10+ years of experience. You never get junior developers learning on your project. Our architects have built APIs for systems serving 50 million users.
Fixed price, not hourly billing
You get a fixed quote in week 2 after the discovery phase. No hourly tracking, no surprise invoices. The price covers the full API build, including documentation and deployment automation.
OpenAPI spec before coding starts
We write a complete OpenAPI specification with request schemas, response examples, and error codes. You review and approve it before we write a single line of code. No scope creep.
Production-grade monitoring and alerting
Every API ships with Datadog dashboards, Sentry error tracking, and PagerDuty alerts. You see request rates, latency percentiles, and error rates from day one in production.
Full IP and code ownership
You own every line of code we write. No licenses, no royalties, no recurring fees. The source code, infrastructure files, and documentation are all in your repository.
Compliance built in, not bolted on
We handle HIPAA, PCI-DSS, SOC 2, and GDPR during API design, not after. For example, we log audits for every FHIR API call and encrypt PHI at rest and in transit using AES-256 and TLS 1.3.
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.