Hire experienced API development developersAPI development
We are senior engineers who build production-grade APIs in 8-12 weeks. You get code owned by you, delivered on time, at a fixed price.
IRPR builds custom APIs for companies that need more than a basic CRUD endpoint. Our experienced API development developers use Python (FastAPI, Django REST), Node.js (Express, NestJS), Go, and Kotlin to design, build, and document APIs that handle millions of requests per day.
Every API project ships in 8-12 weeks at a fixed price between $80K and $250K. We follow your compliance requirements: HIPAA for healthcare, PCI-DSS for fintech and ecommerce, SOC 2 for SaaS. We own no code - you get the full repo, CI/CD pipeline, and deployment scripts.
Our buyers are CTOs at Series A startups who need a secure API layer for their product, engineering leads at healthcare companies who must meet HIPAA data handling rules, fintech founders integrating with banking APIs (Plaid, Stripe, Dwolla), and ecommerce operations directors syncing inventory across Shopify, BigCommerce, and a custom warehouse API.
Types of software we ship.
REST API development
Build stateless, cacheable REST APIs with proper versioning, pagination, and rate limiting. We use OpenAPI/Swagger for docs.
GraphQL API development
Deliver a single GraphQL endpoint that lets frontend teams query exactly what they need. We use Apollo with Node.js or Hasura.
Microservices API development
Architect a distributed system of small, independent services communicating via gRPC or message queues like RabbitMQ.
Third-party API integration
Connect your app to Stripe, Salesforce, HubSpot, or custom SOAP/REST endpoints. We handle auth, rate limits, and error recovery.
B2B API development
Create a public or private API product that external partners can use. Includes API keys, usage tiers, and developer portal.
Real-time API development
Build WebSocket or Server-Sent Events (SSE) APIs for live dashboards, chat, and monitoring. We use Socket.IO or AWS AppSync.
Internal API development
Design cross-service APIs for your own engineering team to use. We document with Swagger and test with Postman collections.
API security audit and hardening
Review existing APIs for OWASP Top 10 risks, rate limiting gaps, and improper auth. We fix vulnerabilities and add monitoring with Datadog.
We build for every business type.
SaaS companies
Healthcare organizations
Fintech firms
Ecommerce brands
Enterprise teams
Why experienced API development developers matter
A poorly built API costs you in security breaches, slow integrations, and lost customers.
IRPR's experienced API development developers design APIs that handle 10,000 requests per second without crashing. We set up proper error handling (HTTP 400s, retries, circuit breakers), authentication (JWT, OAuth 2.0, API keys), and monitoring (Sentry errors, Datadog latency). In one project, we rebuilt a fintech API that had 23% downtime - after us, it hit 99.9% uptime for 18 months straight.
We use code generators to produce typed SDKs for your API so your frontend team never touches raw HTTP. Our API documentation is auto-generated from the spec and hosted on your domain. We also write integration tests that run on every commit, catching breaking changes before they reach production.
The difference between a generic dev shop and IRPR
Not all API developers are equally experienced. Here is what separates IRPR from the rest.
Most dev shops assign junior engineers to API projects because they think any developer can build a REST endpoint. The result is inconsistent error formats, no versioning, and security vulnerabilities that surface months later. IRPR assigns senior engineers with 7+ years of API experience to every project.
We start with a specification phase where we write the entire API contract in OpenAPI before writing a single line of code. Your team reviews and approves the contract. This single practice eliminates 80% of integration bugs. After approval, we build, test, and deploy in parallel - not sequentially.
- no API contract before coding
- inconsistent error responses
- rate limiting added later
- no pagination or cursor support
- junior engineers assigned
- no CI/CD for API testing
- OpenAPI contract written first, approved by you
- consistent JSON error format with codes
- rate limiting and throttling in v1
- cursor-based pagination from day one
- senior engineers with 7+ years experience
- every commit runs integration tests via GitHub Actions
How IRPR builds your API in 4 phases
We follow a repeatable framework that delivers a production-ready API in 8-12 weeks.
Every API project follows the same four-phase process: Idea, Roadmap, Product, Release. This structure was refined over 200+ projects and ensures we never skip a quality step.
In the Roadmap phase (week 2), we produce a fixed quote, a timeline, and a full API contract in OpenAPI. You approve it. Then we build the Product in 6-8 weeks, and the Release phase includes load testing against your target traffic and setting up monitoring.
What you get after building with IRPR
You own everything. No vendor lock, no hidden fees.
When IRPR finishes your API project, you receive a complete, production-ready package. Your team can extend it, maintain it, or pass it to another agency. We do not hold any code or access ransom.
- Full source code in your GitHub or GitLab repo
- CI/CD pipeline on GitHub Actions with auto-deploy to staging
- OpenAPI specification document (YAML or JSON)
- Autogenerated API documentation hosted on your domain
- Client SDKs for TypeScript, Python, and curl
- Postman collection with all endpoints and example payloads
- Docker Compose setup for local development
- Load test report showing performance at 2x target traffic
- Monitoring dashboards in Datadog and Sentry error alerts
- One-hour walkthrough session with your engineering team
What we ship in this practice.
Healthcare provider directory API
Built a HIPAA-compliant REST API for a health insurance startup that aggregates provider data from 12 sources. The API handles 5 million queries per month and reduced data lookup time from 15 seconds to 200ms. Tech stack: FastAPI, PostgreSQL, Redis, AWS Lambda.
Multi-currency payment API for a fintech platform
Designed and built a PCI-DSS Level 1 compliant payment API that supports 45 currencies and 8 payment gateways (Stripe, Adyen, Braintree, etc.). The API processes $3M in transactions monthly with zero security incidents. Tech stack: Node.js, Express, MongoDB, Stripe Connect.
Real-time inventory sync API for an ecommerce brand
Built a WebSocket API that syncs inventory across 4 warehouses and 3 storefronts (Shopify, BigCommerce, custom frontend). The API reduced stockout incidents by 80% and saved the operations team 20 hours per week. Tech stack: Node.js, Socket.IO, PostgreSQL, AWS SQS.
SaaS multi-tenant API with usage-based billing
Created a REST API for a B2B SaaS product that serves 500 tenants. Each tenant gets isolated data, custom rate limits, and API keys. The API integrates with Stripe for usage-based billing and Metronome for invoice generation. Tech stack: Python, FastAPI, PostgreSQL, Redis, Stripe.
Real estate MLS data aggregation API
Built a GraphQL API that normalizes listing data from 23 different MLS systems into a single schema. The API ingests 200,000 new listings daily and serves 5,000 real estate agents. Tech stack: Node.js, Apollo Server, PostgreSQL, Redis, Elasticsearch.
EdTech LTI 1.3 integration API
Developed a set of microservices that implement the IMS Global LTI 1.3 standard for a learning management system. The API handles SSO (OIDC), grade passback (LIS 2.0), and deep linking. It integrated with Canvas and Blackboard within 4 weeks. Tech stack: Node.js, Express, MongoDB, Redis.
Why teams hire us.
Senior engineers, not teams
Every API project is built by developers with 7+ years of experience. We do not staff juniors. Your project gets a lead engineer who has shipped at least 10 APIs before.
Fixed price, fixed timeline
After the Roadmap phase, we give you a fixed price (typically $80K-$250K) and a hard timeline (8-12 weeks). No hourly billing, no surprises. If we miss the deadline, we tell you before it happens.
OpenAPI spec before any code
We write the full API contract in OpenAPI 3.0 during week 2. You approve every endpoint, error code, and response schema. This single step eliminates rework and integration delays.
Compliance built in, not bolted on
We handle HIPAA, PCI-DSS, SOC 2, and FERPA from day one. Our engineers configure logging, encryption, and access controls as they build each endpoint - not during a separate security review.
Full ownership, zero lock-in
You own the source code, CI/CD pipeline, and documentation. We deploy to your AWS, Azure, or GCP account. You can fire us today and your team takes over tomorrow with zero disruption.
Post-release support included
Every project includes 30 days of post-release support where we fix bugs, answer questions, and make minor changes. We also provide a one-hour walkthrough session with your engineering team.
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.