Senior API Integration Development AgencyAPI Integration
We build secure, high-performance API integrations for SaaS, fintech, and healthcare. 12-week delivery, fixed price, senior developers only.
IRPR is a senior API integration development agency. We build custom API integrations using Node.js, Python, Go, and TypeScript, connecting your platform to Stripe, Salesforce, AWS, Twilio, and hundreds of other third-party services. Every integration is designed for high throughput, low latency, and seamless error handling.
We deliver a production-ready API integration in 8-12 weeks. Pricing is fixed and starts at $80K, scaling to $250K for complex enterprise middleware. All projects meet compliance requirements like HIPAA, PCI-DSS, or SOC 2 where needed. You get a dedicated senior engineer who owns the integration end to end.
CTOs hire us to replace fragile point-to-point spaghetti code with a clean API layer. Product managers hire us to launch integrations that unlock new revenue streams. Engineering VPs hire us when their in-house team lacks bandwidth or API specialization. Founders hire us to quickly validate multi-platform product ideas.
Types of software we ship.
Payment API Integration
Connect Stripe, Braintree, or Adyen to your platform. Handle recurring billing, refunds, and multi-currency. PCI-DSS compliant by default.
CRM API Integration
Sync data between Salesforce, HubSpot, or Zoho and your app. Real-time contact, deal, and activity sync with conflict resolution.
ERP API Integration
Connect NetSuite, SAP, or Microsoft Dynamics to your ecommerce or logistics system. Automate order-to-cash and procure-to-pay workflows.
Social Media API Integration
Publish content to Facebook, Instagram, LinkedIn, and Twitter via a single API. Support for video uploads, analytics, and scheduling.
Cloud Platform API Integration
Integrate with AWS S3, Google Cloud Storage, Azure Blob, or DigitalOcean. Build serverless connectors with event-driven triggers.
Third-Party Data API Integration
Fetch and transform data from public APIs like Google Maps, Weather, or financial data feeds. Cache and optimize for high request volume.
Shipping API Integration
Connect to FedEx, UPS, DHL, or Shippo. Generate labels, track packages, and calculate rates in real time. Supports multiple carrier accounts.
Authentication API Integration
Implement OAuth 2.0, OpenID Connect, SAML SSO. Integrate with Okta, Auth0, Azure AD, or Google Workspace for secure user login.
We build for every business type.
Healthcare:
Fintech:
Ecommerce:
SaaS:
Logistics:
Why you need a senior API integration development agency
A single broken API integration can cost thousands in lost revenue and engineering hours.
IRPR's senior API integration development agency delivers integrations that handle 10,000+ requests per second with 99.9% uptime. We use circuit breakers, retry policies, and idempotency keys to ensure data integrity. Every integration is tested with contract tests and load tests before launch.
Our developers have built integrations for healthcare (HIPAA compliant lab data pipelines), fintech (PCI-DSS compliant payment connectors), and logistics (real-time tracking across 50+ carriers). We write code that is maintainable and documented so your team can extend it later.
The difference between a generic dev shop and a senior API integration development agency
Not all agencies have the experience to handle complex, multi-API systems.
Generic dev shops often treat API integration as a side task. They write monolithic adapters that break when the third-party API changes, fail silently, and create security holes. Their code is rarely documented or tested at scale.
IRPR treats API integration as a core engineering discipline. We design a middleware layer with clean abstractions, comprehensive error handling, and monitoring. Every integration includes a runbook for on-call engineers. We also provide post-launch support for the first 30 days.
- No dedicated API specialist
- Code without retry logic or circuit breakers
- No contract tests for third-party endpoints
- Hardcoded credentials in source code
- No monitoring or alerting
- One-size-fits-all approach without security review
- Senior engineers with 10+ years API experience
- Idempotent, retry-enabled, rate-limited connectors
- Contract tests with Pact for every integration
- Credential management via Vault or AWS Secrets Manager
- Datadog or Sentry monitoring with custom dashboards
- Security review with OWASP top 10 checklist
Our 4-phase process for API integration development
We follow a repeatable process that de-risks every integration.
Every project starts with a 2-week Roadmap phase where we audit existing systems and define the integration contracts. We then move into rapid development, followed by testing and deployment. Post-launch we provide handover documentation and 30 days of bug fixes.
The entire process is transparent. You get weekly demos, a shared Slack channel, and a live project board. No surprises, no scope creep.
What ships with every API integration
You own everything. No black boxes, no vendor lock-in.
When you hire a senior API integration development agency like IRPR, you get production-ready code and all supporting artifacts. Your team can take over immediately or we can continue to maintain it.
Every project includes automated tests, documentation, and a deployment pipeline. We never hand over undocumented code.
- Source code in your GitHub/GitLab repo
- CI/CD pipeline with GitHub Actions or GitLab CI
- Unit, integration, and contract tests (Jest, Mocha, Pact)
- API documentation (OpenAPI/Swagger spec)
- Monitoring dashboards (Datadog or Grafana)
- Alerting rules for failures and rate limits
- Runbook for on-call engineers
- Post-launch support: 30 days of bug fixes
- Security audit report (OWASP top 10)
- Environment setup guide (staging and production)
What we ship in this practice.
Payment connector for a fintech SaaS platform
Built a multi-gateway payment integration (Stripe + Adyen) for a recurring billing platform. Implemented smart routing based on transaction cost and success rate. Reduced payment failures by 35%. Tech stack: Node.js, PostgreSQL, Stripe API, Adyen API.
EHR data pipeline for a telemedicine startup
Developed a HIPAA-compliant integration with Epic and Cerner. Synchronized patient records, lab results, and appointment data in real time. Cut manual data entry by 20 hours per week per clinic. Tech stack: Python, FHIR API, AWS Lambda, API Gateway.
Multi-carrier shipping integration for logistics
Connected FedEx, UPS, and DHL APIs into a unified shipping service. Handled label generation, rate quotes, and tracking. Achieved 99.9% success rate on label creation. Tech stack: Node.js, Redis, FedEx API, UPS API, Shippo.
CRM sync for a sales intelligence tool
Built a bidirectional sync between HubSpot and Salesforce. Mapped 50+ fields, handled deduplication, and processed 10,000 records per minute. Reduced sync latency from 5 minutes to 30 seconds. Tech stack: TypeScript, HubSpot API, Salesforce REST API, Kafka.
Inventory and order management for an ecommerce brand
Integrated Shopify, Amazon, and eBay with a custom inventory system. Real-time stock updates, automated reorder thresholds. Cut stockouts by 60%. Tech stack: Python, Django, Shopify API, Amazon MWS, eBay API.
SSO login for a B2B HR platform
Implemented SAML-based single sign-on for enterprise customers. Supported Okta, Azure AD, and OneLogin. Reduced login support tickets by 80%. Tech stack: Node.js, Passport, SAML library, Okta API.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote after the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. You know the cost before we write a single line of code.
Senior engineers only, no junior handoffs
IRPR has no junior developers. Every engineer has 8+ years of experience and has shipped production APIs. You get a dedicated senior engineer for the entire project, not a rotation of new hires.
Compliance-first approach
We build integrations that pass HIPAA, PCI-DSS, and SOC 2 audits. We use encryption at rest and in transit, audit logging, and access controls. We've passed audits for 10+ healthcare and fintech clients.
Proven delivery in 8-12 weeks
Our average MVP delivery time is 12 weeks across 200+ projects. We have a 98% on-time record. The Roadmap phase ensures we know the scope before we commit to a timeline.
Full code ownership and no lock-in
You own every line of code. We hand over the repo, CI/CD pipeline, documentation, and runbook. You can maintain it internally or hire us for ongoing support. There is no platform lock-in or licensing fee.
Post-launch support included
Every engagement comes with 30 days of post-launch support. We fix bugs, optimize performance, and help your team get up to speed. Our average response time is under 1 hour during business hours.
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.