REST & GraphQL · Microservices · Enterprise Webhooks API Development & Integration

Connect your business platforms with fast, scalable custom APIs.

Break down data silos across your organization. We engineer high-performance REST and GraphQL APIs, integrate third-party SaaS platforms (HubSpot, Salesforce, ERPs, shipping carriers), and build secure webhooks that synchronize data in real time.

  • Full OpenAPI / Swagger interactive documentation included
  • Enterprise rate limiting, OAuth 2.0 authentication, and encrypted data payloads
Start a proposal A short note is enough

What API integration do you need?

Select your technical requirement. We reply within one business day.

Prefer email? hello@aviancetechnologies.com

100+APIs & third-party integrations shipped
<50msAverage endpoint response latency
99.99%API webhook uptime & delivery rate
100%OpenAPI documentation coverage

What we engineer

Six API capabilities we build for modern enterprises.

We build reliable data pipelines that eliminate manual double-entry and connect disconnected business systems.

01

Custom RESTful & GraphQL API Engineering

High-speed, scalable endpoints built with Node.js, Python FastAPI, or Laravel, complete with filtering, pagination, and caching.

Powering web apps and mobile applications from a unified backend.
02

CRM & Marketing Automation Sync

Two-way bidirectional data synchronization connecting your website to HubSpot, Salesforce, Zoho, Klaviyo, or ActiveCampaign.

Instant lead scoring, deal creation, and customer profile enrichment.
03

ERP, Warehouse & Accounting Integration

Automating real-time data flow between your website, ERP systems (SAP, NetSuite, Zoho), and accounting tools (QuickBooks, Xero).

Inventory stock reservation and automated invoice generation.
04

Shipping Carrier & Logistics APIs

Integrating live shipping rates, automated label printing, address verification, and tracking webhooks with FedEx, UPS, or Shiprocket.

Instant shipping cost calculations at checkout and automatic tracking emails.
05

Secure Webhook Architecture & Event Queues

Idempotent webhook receivers and dispatchers backed by Redis queues (BullMQ/RabbitMQ) that guarantee zero dropped events under load.

Processing tens of thousands of real-time webhooks reliably without server crashes.
06

API Security, OAuth 2.0 & Rate Limiting

Protecting your endpoints with API key management, JWT tokens, OAuth 2.0 workflows, IP whitelisting, and strict Redis rate limiting.

Preventing scraping, credential stuffing, and unauthorized data access.

Why Aviance

Fragile integrations break silently. We engineer resilient, audited APIs.

Basic webhooks fail when servers restart or APIs change. We build idempotent architectures with automated retries and dead-letter queues.

What matters Template or generic agency An Aviance build Engineered for ROI
Error Handling Silent failures where lost leads or missing orders are discovered weeks later Automated retry queues, dead-letter storage, and instant Slack/email alerts
Documentation Zero documentation leaving future developers guessing payload formats Interactive Swagger/OpenAPI documentation with payload schemas and code samples
Performance Synchronous blocking requests that freeze your website while waiting for APIs Asynchronous background queue processing delivering sub-50ms user response
Data Integrity Duplicate records created when third-party services retry webhooks Strict idempotency keys ensuring duplicate webhooks are safely ignored
Security & Auth Hardcoded API tokens in client-side code visible to anyone in DevTools Encrypted server-side secrets management with scoped OAuth permissions

Interactive Swagger documentation

Every API we build includes full OpenAPI/Swagger documentation so external developers can test endpoints with one click.

Asynchronous background queues

Heavy data sync operations run in background Redis queues, ensuring your front-end website remains blazingly fast.

Real-time telemetry & alerts

We configure logging dashboards (Datadog / Sentry) that alert our team the moment an external third-party API changes or fails.

How an API project runs

A robust, fully documented API integration in 3 to 6 weeks.

We design endpoints, define contract schemas, code business logic, and test against edge cases before live deployment.

01Week 1

API Architecture & Contract Schema

Defining endpoint routes, payload contracts, authentication flows, error formats, and rate limits in an OpenAPI spec.

Approved API technical specification and mock endpoints.
02Week 2–3

Endpoint Development & Database Logic

Developing endpoints in Node.js, Python, or Laravel with database ORM models, validation rules, and caching.

Functional staging API with mock and live data feeds.
03Week 4

Third-Party Integration & Webhooks

Connecting third-party APIs (HubSpot, Stripe, ERPs), writing webhook event dispatchers, and setting up Redis queues.

Bidirectional data sync tested in sandbox environments.
04Week 5

Security Auditing & Load Testing

Conducting automated unit tests, rate-limit stress tests, payload fuzzing, and security vulnerability scans.

Performance benchmarks passing sub-50ms latency targets.
05Week 6

Production Cutover & Documentation Handover

Deploying to cloud infrastructure with automated monitoring, SSL, and delivering the interactive Swagger documentation.

Live API in production with full documentation and monitoring.

Ways to start

Transparent pricing for API development & integrations.

Fixed project pricing based on endpoint count and third-party complexity. Clear deliverables and full IP transfer.

Single Third-Party Integration

From $350

Connect your website to one major third-party platform (HubSpot, Salesforce, Shiprocket, or Google Sheets).

  • Bidirectional data synchronization
  • Secure webhook handler with signature validation
  • Error handling & automated retry logic
  • Full documentation and setup walkthrough
Connect A Platform
Most Popular

Custom API Backend Suite

From $1,200

Bespoke RESTful or GraphQL API backend designed to power web apps, mobile apps, or partner platforms.

  • Up to 15 custom endpoints with filtering & pagination
  • JWT / OAuth 2.0 secure authentication & rate limiting
  • Interactive Swagger / OpenAPI documentation
  • Redis caching layer delivering sub-50ms response
Build Custom API Suite

Enterprise Integration & Microservices

From $2,800

Complex multi-system integration connecting ERPs, legacy mainframes, payment gateways, and databases.

  • Enterprise ERP/CRM integration (SAP, Salesforce)
  • Distributed message queues (RabbitMQ / BullMQ)
  • Docker containerization & CI/CD deployment
  • 60 days post-launch monitoring & SLA support
Discuss Enterprise APIs

A recent project · Universal Fabrication

Custom ERP-to-website inventory API sync with real-time webhook dispatch.

Connected a legacy on-premises ERP database to their modern web platform, automating inventory sync and live stock status across 4,000 SKUs.

  1. 01
    Brief

    Universal Fabrication suffered discrepancies between warehouse stock and website listings, requiring hours of manual daily inventory reconciliation.

  2. 02
    Approach

    We developed an event-driven microservice API that listens to warehouse ERP inventory changes and syncs stock levels to the website in sub-second time.

  3. 03
    Handover

    Eliminated manual inventory entry entirely, with over 100,000 automated stock updates executed monthly with zero errors.

ERP Integration Real-Time Webhooks 100% Automated Stock
More Case Studies

Need to connect disparate software platforms or build a custom API?

Send us your technical requirements and API documentation links. We reply within one business day with an architectural concept, data flow diagram, and fixed project estimate.

Discuss Your API Requirements

Where it shows up

Industries we ship with, and tools we use.

The stack follows the job. We use what your project actually needs.

Industries
  • Logistics & Supply Chain
  • B2B Manufacturing
  • Fintech & Banking
  • E-Commerce Retail
  • Healthcare & Life Sciences
  • SaaS Platforms
  • Real Estate

API Frameworks

High performance
  • Node.js & Express
  • FastAPI (Python)
  • Laravel REST & Sanctum
  • NestJS TypeScript
  • Apollo GraphQL

Third-Party SaaS APIs

Proven integrations
  • HubSpot & Salesforce CRM
  • Stripe & PayPal APIs
  • QuickBooks & Xero
  • Shiprocket & FedEx
  • Twilio SMS & SendGrid

Queues & Caching

Reliable delivery
  • Redis & BullMQ
  • RabbitMQ Message Broker
  • PostgreSQL / MySQL
  • Celery (Python)
  • Kafka Distributed Streaming

Testing & Documentation

Industry standards
  • Swagger / OpenAPI 3.0
  • Postman Collections
  • Jest / PyTest Automated Tests
  • Sentry Error Tracking
  • Datadog Telemetry

FAQ

Frequently asked questions about api development & integration.

Pricing, delivery timelines, platforms, technical specifications, and post-launch support.

Get A Free Quote
01What is the difference between a REST API and a GraphQL API?

A REST (Representational State Transfer) API uses standard HTTP methods (GET, POST, PUT, DELETE) where each endpoint returns a fixed data structure. REST is simple, universally compatible, and easily cached by CDNs. GraphQL allows the client to request precisely the data fields it needs in a single query, preventing over-fetching and eliminating multiple network roundtrips. We help you choose the right architecture based on whether you are building mobile apps, public developer platforms, or internal data syncs.

02How do you ensure our APIs don't get overloaded or crash during traffic spikes?

We design APIs with resilient defense-in-depth mechanisms: 1) Redis in-memory caching stores frequent query responses, delivering sub-20ms latency; 2) Redis rate limiting restricts excessive requests per IP or API key to prevent DDoS abuse; 3) Heavy operations (like email dispatch or document generation) are offloaded to asynchronous background queue workers (BullMQ/RabbitMQ); and 4) Database queries utilize indexing and connection pooling.

03Can you integrate our website with our proprietary or legacy internal database?

Yes. We frequently build secure API microservices that bridge modern web applications with on-premises legacy databases (such as older SQL Server, Oracle, or IBM DB2 systems). We configure secure VPN tunnels or IP-whitelisted reverse proxies with encrypted TLS connections to ensure your internal network remains completely protected.

04How do webhooks work and why are they better than polling?

Traditional polling requires your server to make continuous requests (e.g., every 5 minutes) asking "Are there any new orders?", wasting server resources and introducing delays. Webhooks are real-time and event-driven: the moment an event happens (such as a payment succeeding or a new lead submitting), the source platform instantly pushes an HTTP POST payload to your server. We build secure webhook receivers that verify HMAC signatures and process data in milliseconds.

05How much does custom API development cost in 2026?

Connecting an existing website to a third-party API (like HubSpot, Salesforce, or Shiprocket) typically ranges from $350 to $650. Developing a custom RESTful or GraphQL API backend with 10–15 endpoints, authentication, and Swagger documentation ranges from $1,200 to $2,500+. Large enterprise microservice integrations with ERP systems range from $2,800+. We provide fixed milestone quotes with zero hidden hourly fees.

06How long does an API development or integration project take?

A single third-party API integration typically takes between 3 to 5 business days. A complete custom REST or GraphQL API suite takes between 3 to 5 weeks from initial architecture specification to production cloud deployment. You receive access to interactive Swagger documentation and sandbox test environments throughout development.

07How do you secure API keys and prevent unauthorized data access?

We enforce enterprise security standards: all API endpoints require encrypted HTTPS (TLS 1.3); API keys and OAuth secrets are stored in encrypted environment variables and never committed to source code repositories; user endpoints utilize signed JSON Web Tokens (JWT) with short expiration windows; and role-based access control (RBAC) ensures users can only access their authorized data.

08Will external developers be able to understand and use our API easily?

Yes! Every API we engineer includes interactive OpenAPI / Swagger 3.0 documentation. External developers or partner agencies can view complete endpoint descriptions, parameter types, required headers, and sample JSON payloads, as well as execute test API calls directly within their browser without writing any code.

09Can you build two-way (bidirectional) data sync between two platforms?

Yes. Bidirectional synchronization ensures changes in either system automatically reflect in the other (e.g., a customer updating their address in your web portal updates Salesforce, and a status change in Salesforce updates your portal). We implement conflict resolution logic and timestamp verification to prevent data loops and ensure records remain perfectly synchronized.

10What happens if a third-party API goes down or changes its endpoints?

We build resilient architectures with dead-letter queues and automated exponential backoff retries. If a third-party service (like Salesforce or a shipping carrier) suffers an outage, our system safely queues pending requests in Redis and automatically retries once the service recovers. We also configure automated Sentry and Slack alerts so our team is notified instantly if an upstream API changes.

Tell us what your project should do.

Send a few details. We reply within one business day with scope, timeline, and a number you can plan around.