Top API Integration Development AgencyAPI Integration
We build custom API integrations that connect your products and tools. 12 weeks to production with fixed pricing.
IRPR is a top API integration development agency. We connect your software to third-party services using REST APIs, GraphQL, webhooks, and flat files like CSV or JSON. Our senior engineers handle everything from authentication with OAuth 2.0 to real-time data sync via WebSockets.
Every integration project ships in 8 to 12 weeks at a fixed price of $80,000 to $250,000. We manage compliance requirements like HIPAA for healthcare, PCI-DSS for fintech, and SOC 2 for SaaS. You own the full source code and all documentation.
We work with CTOs who need to connect their product to Salesforce or Stripe. Product managers who want to automate data flow between CRMs and marketing tools. And engineering leads who need a reliable partner to build and maintain custom API middleware.
Types of software we ship.
CRM API Integration
Sync contacts, deals, and activities between your CRM and tools like HubSpot, Salesforce, or Zoho. Automate lead scoring with Zapier webhooks.
Payment API Integration
Connect Stripe, PayPal, or Square to your platform for one-time payments, subscriptions, and invoicing. Map payment events to your ledger in real time.
Ecommerce API Integration
Integrate Shopify, WooCommerce, or BigCommerce with your ERP, WMS, and shipping providers. Sync inventory and orders across systems with hourly pulls.
Healthcare API Integration
Connect EHR systems like Epic or Cerner with your practice management software. Comply with HIPAA using FHIR standards and encrypted payloads.
Marketing API Integration
Link Mailchimp, Klaviyo, or HubSpot to your app for triggered email campaigns. Push audience segments from your product to ad platforms like Google Ads.
Logistics API Integration
Connect ShipStation, FedEx, or UPS APIs to your order management system. Automate rate shopping, label generation, and tracking updates.
SaaS API Integration
Build custom connectors between your SaaS product and tools like Slack, Jira, or Asana. Use OAuth 2.0 for secure user-level data access.
Data Pipeline API Integration
Move data between databases, data warehouses, and APIs using ETL pipelines. Use Snowflake, BigQuery, or Postgres as target sinks with idempotent retries.
We build for every business type.
CRM and sales tools
payment and billing
ecommerce and retail
marketing and email
logistics and shipping
API Integration Services for Complex Workflows
We build integrations that handle millions of API calls per day without failures.
Our team has shipped over 200 API integrations across 50 countries. Each integration handles rate limiting, retries, idempotency, and error logging by default. We use tools like Kong for API gateways and Sentry for real-time error monitoring. For high-throughput systems, we deploy Redis-backed queues and background job workers.
Every integration includes comprehensive documentation in OpenAPI 3.0 format and automated tests that run in CI/CD pipelines. We benchmark every endpoint for latency and throughput before production launch. For regulated industries, we add audit logs and encryption at rest and in transit.
Why Choose IRPR for API Integration Development
Most agencies overpromise and underdeliver on API work. We don't.
Generic dev shops jump into coding without understanding your data flow. They miss edge cases like token refresh failures or schema changes in third-party APIs. You end up with fragile integrations that break on weekends. We see those failures in practice and we design for them from day one.
IRPR writes every integration with versioned endpoints, comprehensive retry logic, and monitoring built in. We use Infra-as-Code with Pulumi or Terraform to deploy your integration across staging and production environments. Your CTO gets a dashboard with request counts, latency, and error rates.
- Starts coding without API documentation
- Skips rate limit handling
- No retry or backoff logic
- Manual deployment to a single server
- No monitoring or alerting
- Code is not reusable across projects
- Designs and documents the API contract in week 1
- Implements exponential backoff with jitter
- Adds idempotency keys for safe retries
- Deploys using CI/CD via GitHub Actions
- Integrates Sentry and Datadog for production monitoring
- Builds reusable connectors with modular code
Our API Integration Process: 4 Phases to Production
We follow a structured process that de-risks API integration work.
Our process starts with a deep analysis of the third-party API documentation and your existing data model. We identify every endpoint, authentication method, and rate limit before writing a single line of code. This phase takes about 1 week and ends with a detailed integration specification.
Then we build the connector in 4 to 6 weeks, including unit tests, integration tests, and end-to-end test suites. We deploy to staging first and run syncs with sample data. After your team validates the output, we ship to production with monitoring and alerting active.
What Ships with Every API Integration Project
You get everything needed to run, maintain, and extend your API integration.
We don't just hand over code. You get the full source in your repository, CI/CD pipeline configuration, and deployment scripts for AWS or GCP. Your team can modify and extend the integration without needing us. We document every endpoint, error code, and configuration option.
You also get real-time monitoring dashboards, automated retry logic, and a test suite that runs on every pull request. If the third-party API changes its schema, your integration logs errors immediately and your team gets notified. We guarantee 99.9% uptime on the integration infrastructure.
- Source code in your GitHub or GitLab repository
- CI/CD pipeline with GitHub Actions or GitLab CI
- Deployment scripts for AWS ECS, Google Cloud Run, or Kubernetes
- OpenAPI 3.0 documentation for every endpoint
- Unit tests and integration tests with 90%+ coverage
- Sentry error tracking and Datadog monitoring
- Retry logic with exponential backoff and jitter
- Idempotency keys for safe retries of failed POST requests
- Rate limit handling with token bucket algorithm
- README with setup, configuration, and troubleshooting guide
What we ship in this practice.
Ecommerce Platform Syncs Orders to ERP
We built a two-way sync between Shopify and NetSuite for a retail brand with 50 stores. The integration pulled 10,000 orders daily and pushed inventory updates every 15 minutes. Used Python, Celery, and Postgres. Reduced manual data entry by 20 hours per week.
Healthcare App Connects to EHR
We integrated a telehealth platform with Epic using FHIR APIs. The integration handled patient demographics, appointments, and clinical notes. Compliant with HIPAA using TLS 1.3 and encrypted storage. Deployed in 10 weeks.
SaaS Startup Syncs with Salesforce
We built a real-time connector between a B2B SaaS product and Salesforce. The integration pushed deal updates via webhooks and pulled contact changes every 5 minutes. Used Node.js, Kafka, and MongoDB. Cut sync latency from 1 hour to under 2 minutes.
Fintech App Integrates with Stripe
We connected a lending platform to Stripe for payment processing and subscription management. The integration handled 50,000 payment events per day with idempotency keys to prevent double charges. Used Ruby on Rails and Sidekiq. Reduced payment failures by 30%.
Logistics Company Integrates with FedEx and UPS
We built a unified shipping API for a 3PL provider that connected to both FedEx and UPS. The integration did rate shopping, label generation, and tracking. Used Python, FastAPI, and Redis. Saved 15 hours per week on manual shipment processing.
EdTech Platform Syncs with Google Classroom
We built a data pipeline that pulled course rosters, assignments, and grades from Google Classroom API into the platform's analytics system. The integration processed 500 schools and synced hourly. Used Python, Airflow, and BigQuery.
Why teams hire us.
Fixed price, not hourly
Every API integration project gets a fixed quote in the Roadmap phase (week 2). You know the exact cost before we write a line of code. No surprise invoices for scope creep or additional endpoints.
Senior engineers only
We staff every integration with engineers who have 8+ years of experience building distributed systems. No junior developers learning on your project. Our team averages 12 years of professional experience.
Production monitoring included
We deploy Sentry and Datadog to monitor every integration in production. You get real-time dashboards for error rates, latency, and throughput. We set up alerts before your customers notice issues.
Full code ownership
You own all source code, documentation, and infrastructure scripts. There is no proprietary framework, no vendor lock-in. Your team can modify, extend, or replace the integration at any time.
Compliance ready
We build integrations that meet HIPAA, PCI-DSS, SOC 2, and FERPA requirements. We add encryption, audit logs, and access controls by default. Our compliance checklist covers 50+ security controls.
Proven results across 200+ projects
We have shipped over 200 custom software products for clients in 50 countries. Our API integrations handle billions of requests per month. Every project ships on time within the fixed budget.
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.