AZRIVA Software Development
          Company Ahmedabad
API Development Company India

API Development Company — REST APIs, GraphQL and Third-Party Integrations. Fixed Price.

We build custom REST APIs, GraphQL APIs, and third-party integrations powering Flutter mobile apps and enterprise systems — payment gateways, WhatsApp Business API, OpenAI and Gemini AI APIs, CRM integrations, and high-performance backend APIs. Node.js, Python, FastAPI. Fixed price. Direct engineer access. DPDP compliant.

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83%
All APIs Use REST Architecture — RapidAPI Survey 2025
$391.3B
Global Mobile App Market Size 2026
17.18%
Mobile App Market CAGR 2026–2031
60-70%
Cost Saving vs USA/UK API Development Agencies
100+
APIs and Mobile Apps Delivered

API Development and Integration Services We Deliver

End-to-end API development and integration services — custom REST APIs, GraphQL APIs, third-party integrations, payment gateway APIs, WhatsApp Business API, OpenAI and Gemini AI API integration, and Flutter mobile app backend connectivity. Node.js, Python, FastAPI, and AWS API Gateway. Every API delivered at a fixed price with direct engineer access and full source code ownership.

Mobile app development services — AZRIVA

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Why Poor API Architecture Breaks Mobile Apps and Business Systems Real Solutions.

The three most common API development failures that cost businesses revenue, users, and compliance standing — and exactly how we solve each one.

01
The Problem

APIs Built Without Mobile Optimisation Destroy Flutter App Performance

APIs designed for web browsers return oversized payloads, require multiple sequential calls to populate a single mobile screen, and do not handle cellular network conditions gracefully. Flutter apps calling poorly designed APIs load slowly, drain battery, fail on intermittent connections, and feel sluggish compared to native apps — frustrating users into abandoning the app regardless of how well the Flutter UI is built.

01
Our Solution

Mobile-First API Architecture — Optimised for Flutter and Cellular Networks

We build REST and GraphQL APIs engineered specifically for Flutter mobile app connectivity — optimised response payloads minimising data transfer, cursor-based pagination for smooth mobile scrolling, offline-first sync endpoints supporting apps in low-connectivity environments, and real-time WebSocket endpoints for live features. Your Flutter app calls APIs that were designed for it. Work with our mobile app development team for APIs and Flutter apps built together from architecture.

02
The Problem

Third-Party API Integrations Without Proper Error Handling Cause Production Failures

Payment gateways go down. WhatsApp Business API rate limits get hit. OpenAI API timeouts happen under load. Third-party API integrations built without retry logic, circuit breakers, fallback handling, and dead letter queues for failed requests cause cascading failures in production — payments do not complete, messages are not sent, and AI features fail silently when users need them most.

02
Our Solution

Production-Grade Integration Architecture — Retry Logic, Fallbacks and Monitoring

Every third-party API integration we build includes exponential backoff retry logic, circuit breakers preventing cascade failures when external APIs are degraded, fallback responses maintaining functionality when integrations are unavailable, webhook verification preventing spoofed callbacks, and real-time integration health monitoring. Our AI API integration services include OpenAI, Gemini, and Claude API middleware with token cost controls and rate limit management built in.

03
The Problem

Unsecured APIs Expose Business Data and Fail Compliance Requirements

APIs without proper authentication, rate limiting, and input validation are the most common attack vector for data breaches in mobile and web applications. An unsecured API endpoint that returns customer records, financial data, or personal information without proper JWT validation, role-based access control, and rate limiting creates serious security and DPDP Act compliance exposure. Most API security failures are not sophisticated attacks — they are basic vulnerabilities that proper API development prevents.

03
Our Solution

Industry-Standard API Security and DPDP Compliance Built Into Every API

We implement JWT authentication, OAuth 2.0, HTTPS enforcement, rate limiting, input validation, SQL injection prevention, and industry-standard API security best practices on every API we build. DPDP Act compliance for all personal data processed through API endpoints implemented from architecture stage. API security testing and penetration testing completed before production deployment. Work with our API development team to get security and compliance built in from day one.

Why Businesses Choose AZRIVA for API Development

From fixed-price delivery to production-grade AI API middleware — here is exactly what makes our API development different from every other backend team in India.

AZRIVA mobile app development team — Ahmedabad, India
AI-Powered
Production-Grade AI Middleware

AI API Integration — OpenAI Gemini and Claude

We integrate OpenAI GPT-4o, Google Gemini, Anthropic Claude, and custom ML model APIs into your backend with production-grade middleware — token cost controls, rate limiting, response caching, fallback handling, and DPDP-compliant data minimisation in AI API payloads. AI API integration that is cost-efficient, reliable, and compliant from the first production call.

Fixed Price
No Open-Ended Backend Billing

Fixed Price API Development Delivery

Every API development project is scoped and priced in full before development begins — endpoints, authentication, third-party integrations, documentation, and deployment all included at a fixed price. No time-and-materials billing for endpoint additions discovered mid-project, no surprise charges for integration complexity, no additional fees for API documentation that should be standard.

IST Overlap
Direct API Engineer Access

IST Timezone — USA and UK Overlap

Our Ahmedabad API development team works IST with deliberate overlap into USA EST mornings and UK GMT afternoons. Direct access to the backend engineers building your APIs during your working hours — not next-day email replies from an account manager who has never seen your API schema or integration requirements.

NDA Protected
Zero Vendor Lock-In

NDA — Full API Source Code Ownership

Every engagement starts with a mutual NDA. Full source code, OpenAPI documentation, environment configurations, API credentials, and all intellectual property transfer to you on project completion. No ongoing licensing fees, no infrastructure dependency, no lock-in to AZRIVA backend services of any kind.

AZRIVA software development team Ahmedabad — mobile app development
Hire a Trusted Mobile App Development Team in India
We build scalable Android, iOS, and Flutter applications for startups and businesses worldwide.
Google UX Design Certified Team · 15+ Years Experience · India-Based Development Team
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Our Development Process

A structured 6-step API development process from discovery and architecture through to deployment, documentation handover, and DPDP compliance sign-off.

01

API Discovery and Architecture Design

Data flows, integration requirements, mobile app connectivity needs, and third-party API dependencies mapped. REST or GraphQL architecture selected. Authentication strategy, rate limiting, versioning, and documentation standards agreed. Fixed-price scope produced before development begins.

02

Tech Stack and Infrastructure Selection

Right backend selected — Node.js with Express or Fastify for high-throughput APIs, Python with FastAPI for ML-integrated endpoints, AWS API Gateway for serverless. Database layer and caching strategy designed before any code is written.

03

API Development and Endpoint Build

RESTful or GraphQL endpoints built with consistent naming, proper HTTP methods, standardised error responses, comprehensive input validation, and full OpenAPI or GraphQL schema documentation generated automatically from sprint one.

04

Third-Party Integration Development

Payment gateways, WhatsApp Business API, OpenAI and Gemini AI APIs, CRM webhooks, shipping APIs, and all required third-party integrations built with retry logic, circuit breakers, webhook verification, and fallback handling as standard.

05

Security Testing and DPDP Compliance

JWT and OAuth 2.0 authentication, rate limiting, industry-standard API security best practices, input sanitisation, and penetration testing completed. DPDP Act compliance for all personal data processed through API endpoints verified before production deployment.

06

Deployment and Documentation Handover

Live deployment to AWS, Google Cloud, or your preferred infrastructure with API monitoring, error logging, usage analytics, and automated alerts. Full OpenAPI documentation, Postman collections, environment credentials, and source code handed over in full.

Build Your Custom API
at a Fixed Price

REST APIs, GraphQL APIs, and third-party integrations for Flutter mobile apps and enterprise systems — payment gateways, WhatsApp Business API, OpenAI and Gemini integration, DPDP compliance, and full source code ownership. Scoped, priced, and delivered in full. Direct engineer access throughout.

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+91 96389 24757
Get a Fixed-Price Quote

App Development Technologies We Work On

We use the right technology for each project — battle-tested stacks chosen for performance, scalability, and long-term maintainability.

Mobile App Development — AZRIVA
Mobile
App Development
AI & ML Solutions — AZRIVA
AI
AI & ML
Solutions
Website Development — AZRIVA
Website
Development
E-Commerce Development — AZRIVA
E-Commerce
Development
Platform & APIs — AZRIVA
Platform
& APIs
Software Solutions — AZRIVA
Software
Solutions

Mobile App Development

We build high-performance native and cross-platform mobile apps for Android and iOS that deliver seamless user experiences across all devices and screen sizes.

What Makes Our API Development Better Than Every Competitor

Every app we build is engineered for performance, security, and long-term scalability — not just to pass QA.

AZRIVA API development team — Ahmedabad India
01

Mobile-First API Architecture — Built for Flutter and Cellular Networks

We engineer REST and GraphQL APIs specifically for Flutter Android and iOS app connectivity — optimised response payloads minimising data transfer on cellular connections, cursor-based pagination for smooth mobile infinite scroll, offline-first sync endpoints supporting apps in zero-connectivity environments, WebSocket endpoints for real-time live features, and Firebase Cloud Messaging push notification APIs integrated from day one. APIs tested against Flutter HTTP client libraries — Dio and http package — on real Android and iOS devices before delivery. Your Flutter app calls APIs designed for it, not APIs originally built for web browsers and retrofitted for mobile.

Flutter · REST · GraphQL · WebSocket
02
100%
Production reliability

Production-Grade Third-Party Integrations — Retry Logic and Circuit Breakers

Every third-party API integration we build is engineered for production reliability — exponential backoff retry logic for transient failures, circuit breakers preventing cascade failures when external APIs are degraded, dead letter queues capturing failed webhook events for reprocessing, webhook signature verification preventing spoofed callbacks from payment gateways, response caching reducing external API call volume and cost, and real-time integration health monitoring alerting before failures impact users. Payment gateways, WhatsApp Business API, shipping APIs, and CRM webhooks all integrated with production-grade reliability architecture from day one.

03

Google-Certified UX for API-Powered Developer and Admin Interfaces

APIs power interfaces that business users, administrators, and developers interact with daily. Our Google UX Design Professional Certified team designs API management dashboards, developer portals with interactive API documentation, webhook event log viewers, integration health monitoring dashboards, and admin interfaces for API key management and rate limit configuration. APIs are not just backend infrastructure — they power the interfaces your team uses to manage your business. Every management interface designed for the people who will use it daily, not just for the engineers who built the API.

Google · Professional Certified
04

API Security Best Practices, DPDP Compliance and Penetration Testing

Every API we build is tested against industry-standard API security practices — broken object level authorisation, broken authentication, excessive data exposure, rate limiting failures, broken function level authorisation, and mass assignment vulnerabilities all tested and remediated before production deployment. JWT and OAuth 2.0 authentication implemented correctly with proper token expiry, refresh token rotation, and revocation. DPDP Act Phase 1 compliance for all personal data processed through API endpoints implemented from architecture stage. Penetration testing completed by our security team before any production API is handed over.

05

AI API Integration — OpenAI, Gemini and Claude With Cost Controls

We build production-grade middleware for OpenAI GPT-4o, Google Gemini, Anthropic Claude, and AWS Bedrock API integration — token cost optimisation through prompt compression and response caching, rate limit management preventing quota exhaustion under load, fallback routing switching between AI providers when primary API is slow, DPDP-compliant data minimisation stripping personal identifiers from AI API payloads, and real-time cost per query monitoring with automated budget alerts. Our AI API integration services deliver reliable, cost-efficient AI capabilities in your applications from the first production API call — not prototype quality middleware that breaks at scale.

OpenAI · Gemini · Claude · AWS Bedrock
06

OpenAPI Documentation and Postman Collections — Zero Integration Friction

APIs without comprehensive documentation create expensive integration delays for every developer who connects to them — internal mobile teams, web developers, third-party partners, and future maintainers. We generate OpenAPI 3.0 documentation automatically from code using tools like Swagger and Redocly, creating interactive API references that let developers test endpoints directly in the browser. Postman collections with example requests and environment variables delivered for every API. GraphQL APIs delivered with full schema documentation and GraphiQL explorer. API documentation that is always in sync with the actual API — not a separate document that falls behind. Post-launch API maintenance, version management, and documentation updates included on retainer.

Mobile App Development for Every Industry in India

We build APIs and mobile app backends for 14+ industries across India, USA, UK and Canada — from payment gateway APIs for FinTech to secure healthcare API endpoints.

1 / 7

Our Recent Work

From our portfolio of 100+ delivered projects — real APIs, mobile apps, and platforms built for clients across India, UK, USA, Canada and internationally. Every project delivered at a fixed price with full source code ownership.

Luxury Property Rental Platform — Spain
Travel & Hospitality

Luxury Property Rental Platform — Spain

A full-stack luxury vacation rental marketplace built for a UK-based hospitality client — property discovery with geospatial map search under 45ms, automated Stripe escrow payments, host onboarding, and a 98/100 Lighthouse performance score. Delivered in 14 weeks at a fixed price with 300% revenue growth post-launch.

Next.js 15TypeScriptTailwind CSSPostgreSQLCloudflareStripe
View Case Study
B2B Manufacturer Dealer Portal — Built for Indian Manufacturer
Manufacturing

B2B Manufacturer Dealer Portal — India

A custom three-module B2B dealer ordering portal built for an Indian manufacturer — replacing WhatsApp and spreadsheet order management with automated dealer management, tier-based pricing, GST invoicing, and real-time dispatch tracking. Multi-state dealer network. Delivered in 20 weeks under NDA.

ReactNode.jsMongoDBTailwind CSSRazorpayAWS
View Case Study
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What Clients Say About Our Mobile App Development in India

Real feedback from businesses we have built APIs, mobile apps, and platforms for — across India, USA, UK, Canada and internationally.

"
The Android app with DRM-protected content streaming was exactly what we needed. Widevine integration worked perfectly from day one. The team understood our requirements completely and delivered without compromise.
Spiritual Platform Client
GuruTattva App, India
Technical Leader
Ahmedabad, India
Ahmedabad, India
"
The Flutter app delivered for our field team works flawlessly even in low-connectivity areas. Offline sync was exactly what we needed. Post-launch support has been excellent.
Enterprise Client
Confidential — NDA
Chief Technology Officer
Mumbai, India
Mumbai, India

Why Clients Trust AZRIVA as Their API Development Company in India

Businesses across USA, UK, Canada, Germany, Australia and India choose AZRIVA for API development because we combine mobile-first API architecture, production-grade third-party integrations, and industry-standard API security practices with transparent fixed pricing and direct engineer access. Unlike larger API development companies in India that route communication through account managers, every AZRIVA client works directly with the backend engineers building their APIs. Our custom API development process — from discovery and architecture design through endpoint development, security testing, DPDP compliance verification, and full documentation handover — is designed to deliver production-ready APIs on time, within budget, and built specifically for your Flutter mobile app or enterprise system integration requirements.

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API Development & Integration Insights

Practical guides from AZRIVA's engineering team — written for CTOs and product teams planning API-first architectures and third-party integrations.

AI Integration in Mobile Apps: A Practical Guide for Business Owners — AZRIVA Insights
AI

AI Integration in Mobile Apps: A Practical Guide for Business Owners

A straight-talking guide to AI integration in mobile apps — covering use cases, implementation approaches, cost expectations, and how to add AI features to an existing app without starting from scratch.

AI IntegrationMobile App
Read Article
Custom Software vs Off-the-Shelf: What Growing Businesses Need to Know — AZRIVA Insights
Software

Custom Software vs Off-the-Shelf: What Growing Businesses Need to Know

A straight-talking comparison of custom software vs off-the-shelf solutions — covering total cost of ownership, flexibility, integration capability, and which approach delivers better long-term value for growing businesses.

Custom SoftwareSoftware Development
Read Article
How Long Does Mobile App Development Take? A Realistic Timeline Guide — AZRIVA Insights
Mobile App

How Long Does Mobile App Development Take? A Realistic Timeline Guide

A realistic breakdown of mobile app development timelines — covering every phase from discovery to App Store launch, with honest estimates for simple, mid-complexity, and enterprise-grade apps.

Mobile AppApp Development
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Senior Engineers. Startup Agility.
Transparent Execution.

We are a highly technical API development team helping startups and growing businesses build custom REST APIs, GraphQL APIs, and third-party integrations with direct communication, fixed pricing, and long-term technical support.

Reach Out Now
+91 96389 24757
Get a Fixed-Price Quote

API Development and Integration — Common Questions

Honest answers from our API development team in India — covering REST APIs, GraphQL, third-party integrations, costs, timelines, DPDP compliance and more.

Updated May 2026
API development is the process of building Application Programming Interfaces — the connection layers that allow different software systems, mobile apps, and third-party services to communicate and exchange data securely. Custom API development for mobile apps creates endpoints that mobile apps call to retrieve and submit data, integrations that connect your systems to payment gateways and third-party services, and backend services that power the business logic your applications depend on. REST and GraphQL are the two dominant API architectures used in modern mobile app and web development.
Custom API development cost in India depends on the number of endpoints, complexity of business logic, third-party integrations required, and whether AI API integration is included. A standard REST API with 20 to 30 endpoints, basic authentication, and database integration costs between 2 lakh to 6 lakh rupees. A mid-complexity API platform with 50 plus endpoints, multiple third-party integrations, payment gateway, and WhatsApp Business API costs 6 lakh to 15 lakh rupees. Enterprise API platforms with AI integration, complex workflow automation, and high-availability infrastructure cost 15 lakh rupees and above. AZRIVA provides a fixed-price quote after mapping your API development cost India requirements.
REST APIs are right for most projects — well-understood, widely supported, easy to cache, and compatible with every client platform including Flutter, React Native, web, and third-party integrations. REST is recommended when you have clearly defined resources and standard CRUD operations. GraphQL is right when your clients need flexible data queries — particularly useful for mobile apps that need to fetch precisely the data they need in a single request, reducing over-fetching and under-fetching on cellular network connections. For Flutter mobile apps with complex data requirements, GraphQL often delivers better performance. AZRIVA recommends the right architecture after mapping your specific data and integration requirements. Contact our REST API development company India team for a free architecture consultation.
Yes. We build REST and GraphQL APIs engineered specifically for Flutter API development India — optimised response payloads minimising data transfer on mobile networks, pagination and cursor-based loading for smooth infinite scroll on mobile, offline-first sync endpoints supporting Flutter apps in low-connectivity environments, push notification APIs for Firebase Cloud Messaging integration, and real-time WebSocket endpoints for live data features in Flutter apps. Every API we build for mobile is tested against Flutter HTTP client libraries before delivery.
We integrate payment gateway APIs including Razorpay, Stripe, PayU, PhonePe Business, and PayPal. Communication APIs including WhatsApp Business API, Twilio SMS, SendGrid email, and Firebase push notifications. AI API integration services India including OpenAI GPT-4o, Google Gemini, Anthropic Claude, and AWS Bedrock. Mapping APIs including Google Maps Platform and Mapbox. Shipping APIs including Shiprocket, Delhivery, and FedEx. CRM APIs including Salesforce, HubSpot, and Zoho. Any custom third-party API your business requires.
We implement JWT token-based authentication for stateless API security development India, OAuth 2.0 for third-party delegated authorisation, API key management for service-to-service authentication, HTTPS enforcement on all endpoints, rate limiting preventing brute force and DDoS attacks, input validation and sanitisation preventing injection attacks, role-based access control restricting endpoint access by user type, and industry-standard API security best practices across all custom API development. APIs handling sensitive data are additionally tested with automated security scanning before production deployment.
Yes. All API development we deliver from 2025 onwards is architected with India Digital Personal Data Protection Act Phase 1 compliance built in from the start. APIs that collect, process, or transmit personal data require specific data minimisation in request and response payloads, purpose limitation on data processing endpoints, audit logging for all personal data access, retention controls for personal data stored through API interactions, and consent verification for data collection endpoints. Secure data handling and access controls implemented as standard for all client integrations. Contact our DPDP compliant API development India team for a compliance consultation.
Indian API development companies deliver REST API, GraphQL, and third-party integration expertise at 60 to 70 percent lower cost than US or UK agencies. AZRIVA specifically builds APIs for mobile-first deployments — REST and GraphQL backends engineered specifically for Flutter Android and iOS app connectivity alongside web and enterprise system integration. Direct engineer access without account managers, IST timezone overlap with USA and UK working hours, fixed-price delivery, DPDP compliance built in from architecture stage, and a proven track record of APIs and mobile apps delivered for clients across USA, UK, Canada, Germany and India. Learn more about our API development company India capabilities.
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