Senior API Development ConsultantsAPI Development
We ship production-grade APIs in 8-12 weeks with a fixed price. No surprises, just senior engineers who own the outcome.
IRPR builds production-grade APIs for startups and enterprises using Node.js, Go, Python, and Rust. We design RESTful and GraphQL interfaces with OpenAPI 3.0 specs and test them at scale with k6 and Postman.
Every engagement ships with a fixed price determined during the Roadmap phase (week 2). Typical scopes range from $80K to $250K with an 8-12 week timeline. We support compliance standards like SOC 2, HIPAA, and PCI-DSS.
Our senior API development consultants work with CTOs at funded startups building API-first products, VP Engineering at mid-market companies integrating third-party systems, technical founders launching SaaS MVPs, and Enterprise architects modernizing legacy monolithic APIs.
Types of software we ship.
RESTful API Development
Build resource-oriented APIs with versioning, pagination, and rate limiting using Express.js or FastAPI.
GraphQL API Development
Create flexible data graphs with Apollo Server and Prisma, enabling efficient client-side queries and subscriptions.
gRPC API Development
High-performance APIs with Protocol Buffers for microservices communication using Go or C++ backends.
WebSocket API Development
Real-time bidirectional APIs for chat, live dashboards, and streaming using Socket.IO or native WebSockets.
Third-Party API Integration
Connect your product to Salesforce, Stripe, HubSpot, Twilio, and 50+ other platforms with custom connectors.
API Gateway Configuration
Set up Kong, AWS API Gateway, or Traefik with authentication, throttling, and logging for unified API management.
API Security Auditing & Hardening
Audit your existing APIs for OWASP Top 10 vulnerabilities, implement OAuth 2.0 and JWT policies.
API Documentation & Developer Portal
Auto-generate interactive docs with Stoplight or Redoc, build a developer portal with API key management.
We build for every business type.
Fintech
Healthcare
E-commerce
SaaS
Logistics & Transport
What senior API development consultants deliver
Every IRPR engagement ships a complete, documented, and tested API that your team can own immediately.
We start with a 2-week Roadmap phase where we define the API contract, endpoints, data models, and integration points. This becomes the fixed-price scope of work. No guesswork, no change orders.
During development we iterate in 2-week sprints with automated CI/CD pipelines running unit and integration tests. You see working APIs every sprint. At launch you get OpenAPI 3.0 specs, Postman collections, and infrastructure code.
The difference: IRPR vs generic dev shops
Most agencies treat API projects as open-ended engineering hours. IRPR treats them as a product to ship.
Generic shops often assign junior developers, change scope mid-project, and hand off incomplete documentation. You end up with an API that works now but fails under load and has no specs for your team to extend.
IRPR assigns senior engineers only (10+ years experience). We deliver fixed price, comprehensive docs, and full code ownership. Every API comes with auto-generated OpenAPI 3.0 specs, Postman collections, and production monitoring.
- Vague scope that changes
- Junior or offshore developers
- Hourly billing with surprise invoices
- No API documentation until the end
- No post-launch support
- Code may be owned by the agency
- Fixed price from Roadmap phase
- Senior engineers only (10+ years)
- Thorough API specs before coding
- Auto-generated OpenAPI 3.0 docs
- 4 weeks of post-launch support included
- Full source code ownership from day one
How we build your API
Our process is four phases: Roadmap, Architecture, Development, and Release. Each phase produces a concrete deliverable.
The Roadmap phase takes 2 weeks and produces a fixed-price specification. We define endpoints, data models, authentication flows, and integration points. You approve the spec and we lock the budget.
Development runs in 2-week sprints with a demo at the end of each sprint. Your team can inspect code, run tests, and provide feedback. The final release includes deployment to your cloud environment, monitoring setup, and a 4-week support window.
What ships with every API engagement
You get more than just code. Every deliverable is production-ready and owned by you.
We treat documentation as a first-class deliverable. Your team receives OpenAPI 3.0 specs, Postman collections, and a developer guide. All infrastructure is defined as code so you can redeploy anywhere.
We also set up monitoring dashboards, error tracking, and logging from day one. Your API is observable from the moment it hits production.
- Source code in your private repository (GitHub, GitLab, Bitbucket)
- CI/CD pipeline with GitHub Actions or GitLab CI
- OpenAPI 3.0 specification document
- Postman collection with example requests
- Unit and integration tests with 95%+ code coverage
- API monitoring dashboards in Datadog or Grafana
- Error tracking with Sentry or Rollbar
- Cloud infrastructure as code (Terraform, Pulumi)
- Production-grade rate limiting and authentication
- 4 weeks of post-launch support and bug fixes
What we ship in this practice.
Payment Gateway API for a Fintech Startup
Built a RESTful payment processing API that handles 10,000+ transactions per minute. Reduced transaction processing time by 40% compared to their previous provider. Tech stack: Go, PostgreSQL, Stripe Connect, Redis.
Telehealth API for a Health Tech Company
Developed a WebSocket and WebRTC-based API for real-time video consultations. Enabled 500+ concurrent sessions with sub-100ms latency, passing HIPAA compliance audits. Tech stack: Node.js, WebRTC, Redis, AWS Kinesis.
Inventory Management API for an E-commerce Platform
Created a GraphQL API that syncs inventory across 3 warehouses and 2 marketplaces. Reduced stock sync delays from 15 minutes to 10 seconds. Tech stack: GraphQL, MySQL, AWS Lambda, SQS.
CRM Integration API for a SaaS Company
Built a bi-directional integration API connecting a SaaS product to Salesforce and HubSpot. Automated data sync reduced manual data entry by 10 hours per week per rep. Tech stack: Python, Flask, MongoDB, AWS AppSync.
Fleet Tracking API for a Logistics Company
Developed a real-time tracking API using Kafka and WebSockets processing 1M+ GPS data points daily. Cut ETA calculation time from 5 seconds to 100ms. Tech stack: Kafka, Go, PostgreSQL, Docker.
Media API Gateway for a Digital Publisher
Unified 12 legacy content APIs under a single Kong API gateway with rate limiting and caching. Improved average API response time by 30% and simplified client integration. Tech stack: Kong, Node.js, Docker, Redis.
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 time and on budget.
Senior engineers only
Every architect and developer on your project has at least 10 years of experience. We do not use junior or offshore teams. Our senior API development consultants have shipped over 200 APIs to production.
API-first architecture by default
We design your system around the API, not as an afterthought. This means clean contracts, versioning from day one, and backward compatibility. Your API can evolve without breaking existing clients.
Thorough documentation every time
You receive auto-generated OpenAPI 3.0 specs, Postman collections, and a developer guide. No black-box code -- your team can extend the API immediately after launch.
Post-launch support included
Every engagement includes 4 weeks of post-launch support. We fix bugs, answer questions, and help with initial integrations. Production incidents are handled with a 4-hour response SLA.
Full code ownership
You own all source code, infrastructure scripts, and documentation from day one. No licensing fees, no ongoing royalties. You can deploy the API on your own cloud or take it to another 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.