Backend API Development ServicesAPI Development
We build production-grade backend APIs used by 200+ products in 50+ countries. Your data moves reliably, securely, and at scale from week 8.
IRPR builds backend API development services that connect your frontend, mobile app, or third-party system to a reliable data layer. We use Node.js, Python (FastAPI/Django), PostgreSQL, and Redis to deliver APIs that handle millions of requests per day. Every API is designed with OpenAPI (Swagger) specs, automated tests, and CI/CD pipelines using GitHub Actions.
Our backend API development services ship a working MVP in 8-12 weeks. Fixed price ranges from $50K to $150K depending on complexity and compliance needs. We have delivered HIPAA-compliant APIs for healthcare, PCI-DSS APIs for fintech, and SOC 2-ready APIs for SaaS platforms. Source code is owned by you from day one.
Buyers who hire us for backend API development include: CTOs at SaaS startups needing to replace a monolithic backend with microservices; product managers building a new API-first product who want a faster path to market; and enterprise architects integrating legacy systems with modern REST or GraphQL APIs.
Types of software we ship.
REST API Development
Build RESTful APIs using Express.js or Django REST Framework with auto-generated documentation via Swagger and OpenAPI 3.0.
GraphQL API Services
Design GraphQL APIs with Apollo Server or Hasura, enabling flexible queries and real-time subscriptions for modern web and mobile apps.
Microservices API Architecture
Decompose monoliths into independent microservices with message queues (RabbitMQ, Kafka) and containerized Node.js or Go services.
API Integration Services
Connect your app to Stripe, Salesforce, Twilio, or any third-party API using custom adapters with retry logic and error handling.
Third-Party API Wrappers
Wrap complex third-party APIs (e.g., payment gateways, shipping providers) in a clean, unified SDK in your preferred language.
Real-Time API (WebSocket)
Implement real-time features with WebSockets (Socket.IO) or Server-Sent Events for live chat, notifications, and data streaming.
Internal / Private API Development
Create internal APIs for company microservices with authentication, rate limiting (Redis), and audit logging using NGINX or Kong.
API Gateway & Proxy Setup
Configure API gateways (AWS API Gateway, Kong, Tyk) with routing, caching, throttling, and OAuth2/OIDC authentication.
We build for every business type.
SaaS Platforms
Ecommerce
Healthcare
Fintech
Mobile & IoT
What We Deliver with Backend API Development Services
Every backend API we build ships with measurable reliability, security, and speed.
Our backend API development services produce more than just code. Each API gets a complete specification in OpenAPI 3.0, automated test suites (unit, integration, load), and a CI/CD pipeline on GitHub Actions. We enforce coding standards with ESLint/Prettier and run SAST scans with SonarQube before every merge.
Performance targets are defined upfront. For example, a recent fintech API handled 10,000 requests per second with 99.9% uptime on AWS with auto-scaling. Latency stayed under 150ms for 95th percentile. We document everything so your internal team can take over maintenance immediately.
Why Generic Dev Shops Fail at Backend API Development Services
Building a production-grade backend API requires more than just writing endpoints.
Many agencies treat API development as a side task. They skip performance testing, neglect security reviews, and hand over undocumented code. That leads to slow endpoints, broken integrations, and compliance gaps that cost you customers.
IRPR treats backend API development as a core discipline. Our senior engineers follow strict design patterns (Clean Architecture, DDD) and use tools like Sentry for error tracking and Datadog for monitoring. Every API we ship includes a runbook for on-call teams.
- Unclear specs or no contract
- Hourly billing with no cap
- No automated tests
- API docs written last (or never)
- No CI/CD pipeline
- You don't own the code
- Fixed price after Roadmap phase
- OpenAPI spec before coding starts
- 100% automated test coverage
- Auto-generated docs via Swagger
- CI/CD on GitHub Actions from sprint 1
- Full source code ownership from day 1
Our 4-Phase Process for Backend API Development Services
We move from idea to production API in eight to twelve weeks with transparent milestones.
The process starts with a two-week Roadmap where we define the API contract, choose the tech stack, and agree on a fixed price. After that, we build in two-week sprints with demos every Friday. You see working endpoints by week 4, not just mockups.
Deployment to staging happens by week 6, and we spend weeks 10-12 on load testing, security audits, and documentation finalization. The API is then released to production with a runbook and monitoring alerts.
What Ships with Every Backend API Development Engagement
You get a production-ready API plus everything needed to operate it independently.
Our standard delivery includes the complete application, infrastructure as code (Terraform), and a runbook. We also provide a Postman collection for manual testing and a Grafana dashboard for real-time metrics.
The code is yours. We push the final version to your GitHub or GitLab repo, with full commit history. We also include a migration guide and a one-hour video walkthrough for your team.
- Full source code in your private repository
- CI/CD pipeline using GitHub Actions or GitLab CI
- OpenAPI 3.0 specification (Swagger)
- Postman collection with example requests
- Automated unit, integration, and load tests (Jest, pytest, k6)
- Docker containers and docker-compose for local development
- Terraform scripts for AWS, GCP, or Azure deployment
- Sentry error tracking and Datadog monitoring set up
- Database migrations (PostgreSQL or MongoDB)
- Runbook with incident response steps
What we ship in this practice.
Payment Processing API for Fintech
Built a PCI-DSS compliant API that processes 50,000 transactions daily with Stripe and Plaid. Reduced chargeback handling time by 70%. Tech stack: Node.js, Express, PostgreSQL, Stripe SDK, AWS Fargate.
Patient Data API (FHIR) for Telehealth
Developed a HIPAA-compliant FHIR API to sync patient records between EHR systems. Cut manual data entry by 8 hours per provider per week. Tech stack: Python FastAPI, FHIR resources, PostgreSQL, Auth0.
Product Catalog API for Ecommerce Marketplace
Created a GraphQL API serving product search, inventory, and pricing to a mobile app. Handles 1 million queries per day with sub-200ms response times. Tech stack: Apollo Server, MongoDB, Redis, AWS Lambda.
Real-Time Notification API for SaaS Platform
Built a WebSocket-based API delivering push notifications to 500k users. Achieved 99.99% delivery success with under 100ms latency. Tech stack: Socket.IO, Node.js, Redis Pub/Sub, AWS API Gateway.
Internal Inventory Sync API for Logistics
Designed REST APIs to sync inventory across 15 warehouses via Kafka. Reduced stock discrepancies from 5% to 0.2%. Tech stack: Spring Boot, Kafka, PostgreSQL, Docker on Kubernetes.
Social Feed Aggregation API for Media App
Developed a microservice that aggregates posts from Twitter, Instagram, and YouTube with deduplication. Processes 200k posts/hour with 99.5% uptime. Tech stack: Python FastAPI, Celery, Redis, Elasticsearch.
Why teams hire us.
Fixed Price, Not Hourly
Every backend API development project gets a fixed quote after our two-week Roadmap phase. You know the budget from week 2. No hourly billing, no surprise invoices, no scope creep charges.
Senior Engineers Only
Each project is staffed with engineers who have 10+ years of experience. No juniors, no B-team. Our team has built APIs for companies processing $1B+ in annual transactions.
8-12 Week MVP Delivery
We ship a working backend API with documentation and tests in 8-12 weeks. Your users can start integrating with production endpoints by week 10, not month 12.
Full Source Code Ownership
You own every line of code written. No black-box IP, no licensing fees, no hidden dependencies. We push the final code to your repository with a clean commit history.
Compliance-Ready by Default
Our APIs are built with HIPAA, PCI-DSS, SOC 2, and GDPR controls from day one. We use encrypted data storage, audit logging, and role-based access out of the box.
Async-First, Timezone Overlap
We work async but guarantee 4-hour daily overlap with US timezones. You talk to your project manager via Slack daily and get a written status report every Friday.
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.