API Development &
Integration Services

We design, build, and harden REST/GraphQL APIs and third-party integrations
with security, observability, and reliability baked in, not bolted on later.

// not “an API”

The outcomes you’re buying

Ship Integrations Faster

Ship integrations faster

Reduce Integration Incidents

caused by retries, bad contracts, or missing safeguards

Stop Data Drift

between tools (CRM, billing, ops, analytics)

Enable Partners And Internal Teams

with clean, documented, versioned endpoints

Make APIs Operational

(monitoring, rate limits, alerts, audit trails)

// SIGNALS TO ACT

When this service is the right move

You likely need API development services or API integration services if:

Your product is becoming “integration-dependent” (Stripe/ Shopify / CRM / Identity / Analytics) and failures are multiplying

You have APIs, but they’re inconsistent, poorly documented, or hard to extend

You’re seeing duplicate writes, partial failures, or weird billing/usage bugs after retries

Partners keep asking for “one small endpoint” that turns into weeks of risk

Your team can build features, but platform glue is slowing everything down

// API systems, not endpoints

What we build

We don't have "standard ops software." Instead, we listen to your chaos, understand your workflow, and build the exact systems you need.

Custom API Development (REST / GraphQL)

Clean API contracts, resource modeling, versioning, and predictable behavior built to evolve.

Third-Party API Integrations

Payments, CRM, email, identity, shipping, analytics. Integrated with resilience, retries, and clear failure tracking.

Webhooks & Event-Driven Integrations

Real-time sync without polling: webhook delivery guarantees, signature validation, replay handling, dead-letter patterns.

API Gateway & Management Layer

Rate limiting, auth enforcement, request validation, routing, throttling, observability, and policy control.

API Security & Access Control

OAuth/JWT, RBAC, API keys, tenant isolation/audit, and logs built around real threat models. OWASP/API risks categorized as a baseline fixer, not a checkbox.

Documentation, SDKs & Developer Experience

Human-readable docs + massive realtime specs (OpenAPI), example requests, Postman collections, internal onboarding.

Custom API Development (REST / GraphQL)

Clean API contracts, resource modeling, versioning, and predictable behavior built to evolve.

Third-Party API Integrations

Payments, CRM, email, identity, shipping, analytics. Integrated with resilience, retries, and clear failure tracking.

Webhooks & Event-Driven Integrations

Real-time sync without polling: webhook delivery guarantees, signature validation, replay handling, dead-letter patterns.

API Gateway & Management Layer

Rate limiting, auth enforcement, request validation, routing, throttling, observability, and policy control.

API Security & Access Control

OAuth/JWT, RBAC, API keys, tenant isolation/audit, and logs built around real threat models. OWASP/API risks categorized as a baseline fixer, not a checkbox.

Documentation, SDKs & Developer Experience

Human-readable docs + massive realtime specs (OpenAPI), example requests, Postman collections, internal onboarding.

01

// examples, not limits

Integrations we commonly deliver

Payments & Billing

Stripe, Paddle, Chargebee

Commerce

Shopify, WooCommerce

CRM & Marketing

Salesforce, HubSpot, Mailchimp

Identity & Access

Auth0, Firebase Auth, SSO providers

Data & Analytics

GA4 events, Segment, Mixpanel, data warehouses

Ops & Finance

QuickBooks, Xero, ERPs, inventory systems

We integrate beyond this list, these are simply the most common patterns.

// Built to evolve

How We Build APIs That Don’t Break Under Real Use

We don’t treat APIs as implementation details.
We treat them as long-lived system contracts that must stay stable while everything around them changes.
Our delivery approach is designed to reduce integration risk, prevent data corruption, and make APIs safe to evolve as traffic, partners, and use cases grow.

API & Integration
Blueprint

Define what must stay stable before you ship what’s fast.

Before writing production code, we align on:

You Get

A clear API contract, integration map, known failure scenarios, and a rollout plan your team can execute with confidence.

Contract-First
API Layer

Contract-First API Layer

We design APIs from the contract outward:

You Get

On-OpenAPI specification, a tested contract set, and reference examples that ensure the API without guesswork.

Production-Grade
Integration Resilience

Retries without corruption. Failures without chaos.

Mitigate risk for M&A or production. We design for reliability, not just integration.

You Get

Integrations services that recover cleanly, endure network failures, and maintain contract models, updating data on changing flows.

Secure, Observe,
And Operate

If you can’t see it, you can’t trust it.

Every API we deliver is operational from day one.

You Get

An API surface your team can actually operate and tune safely, confidently, as usage and integrations increase.

// API QUALITY STANDARD

Typical API build VS Genesys API build

Typical API build

Endpoints First, Contract Later

Minimal Error Modeling

Retry Behavior Undefined

No Observability Standard

Integrations Become One-Off Scripts

Genesys API build

Contract-First Design (OpenAPI + Examples)

Consistent Versioning • Predictable Responses

Idempotency • Safe Retry Strategy For Writes

Monitoring/Alerts As Part Of “Definition Of Done”

Integrations Designed As Maintainable Systems, Not Brittle Glue

// DELIVERABLE OUTCOMES

What you get

// Case Studies for This Service

Transformations We’ve Delivered

Real integrations are measured in uptime, accuracy, and operational load, not “it works on staging

Billing + Usage Sync Stabilization

Cut invoice mismatches and retry-related duplicates.

Result:

Accuracy ↑ [X%] | Support tickets ↓ [X%]

CRM ↔ Product Data Consolidation Layer

Unified customer data across tools into one reliable source.

Result:

Manual ops time ↓ [X hrs/week] | Data errors ↓ [X%]

Webhook + Event Pipeline Hardening

Reliable event delivery with replay & out-of-order fixes.

Result:

Missed events ↓ [X%] | Latency ↓ [X ms]

API Gateway + Access Control Rollout

Rate limits, audit logs, and role-based access across services.

Result:

Incidents ↓ [X%] | Time-to-detect ↓ [X]

01

FAQ / Before You Partner

Depends on scope. Most engagements start with a blueprint phase, then staged delivery so you can ship value early without losing control.

Stop shipping integrations that become future outages.

Stop shipping integrations that become future outages.

If your API surface is expanding and reliability is falling Genesys will help you build an API and integration layer that scales cleanly.