APIs & Integrations

APIs are the connective tissue of modern digital businesses — linking your internal systems, enabling partner integrations, and powering your mobile and web applications. Alchemilla Ventures specialises in API design, development, and integration, with experienced engineers.

The API Economy

Whether you’re exposing APIs for partners, consuming third-party services, or connecting internal systems, API quality directly impacts developer experience, security posture, and business agility. Our API team has designed and built APIs handling billions of requests per month for fintech, e-commerce, and enterprise clients.

Our API & Integration Services

• API Design & Architecture: We design APIs that developers love to use:

• REST APIs: Resource-oriented design following OpenAPI 3.x specification, with consistent naming, versioning, pagination, filtering, and error handling. We produce OpenAPI/Swagger documentation that serves as both human-readable reference and machine-readable contract for code generation.

• GraphQL APIs: Schema-first GraphQL design for flexible, client-driven data fetching. We implement Apollo Server or Yoga with DataLoader for efficient database querying, federation for distributed graphs, and persisted queries for security and performance.

• gRPC APIs: High-performance RPC APIs using Protocol Buffers for service-to-service communication — ideal for microservices, real-time streaming, and mobile-to-server communication where bandwidth efficiency matters.

• Async/Event-Driven APIs: WebSocket for real-time two-way communication, Server-Sent Events for one-way streaming, and message queue-based APIs (Kafka, RabbitMQ, SQS/SNS) for event-driven architectures.

• API Development: We build production-grade APIs using:

• Node.js (Express, Fastify, NestJS): TypeScript-first with Zod validation, Prisma/Drizzle ORM, comprehensive error handling, rate limiting, and API key management.

• Python (FastAPI, Django REST Framework): Auto-generated OpenAPI docs, Pydantic validation, async support, and admin interfaces for API management.

• Go: High-performance, low-latency APIs with excellent concurrency — for services requiring maximum throughput.

• API Gateway Implementation: Deploy Kong, Traefik, NGINX, or cloud-native gateways (AWS API Gateway, Azure API Management) for authentication, rate limiting, request transformation, and API analytics.

• Third-Party API Integration: We connect your applications with hundreds of external services:

• Payment Gateways: Razorpay, PayU, CCAvenue, Cashfree, Stripe, PayPal, PhonePe, and custom integration — including recurring payments, refunds, settlements, and reconciliation.

• Communication APIs: Twilio, Gupshup, Karix, and TextLocal for SMS, WhatsApp Business API for messaging, SendGrid and AWS SES for transactional email, and Agora/Twilio for audio/video calling.

• the Government APIs: eKYC, DigiLocker, UPI, filing (GSP), e-way bill, PAN verification, and Account Aggregator framework — essential for fintech, insurance, and lending platforms.

• Maps & Location: Google Maps, Ola Maps — for location data, address geocoding, and route optimisation.

• Logistics APIs: Delhivery, ShipRocket, Blue Dart, DTDC for e-commerce shipping and tracking.

• ERP & CRM Integration: SAP, Oracle, Microsoft Dynamics, Salesforce, Zoho, and Tally — connecting modern applications with enterprise systems of record.

• API Security: We implement comprehensive API security:

• Authentication — OAuth 2.0, OpenID Connect, API keys, JWT with rotation

• Authorisation — RBAC, ABAC, fine-grained permissions

• Rate limiting — per-user, per-IP, per-endpoint with configurable tiers

• Input validation — schema validation, SQL injection prevention, XSS protection

• API security testing — OWASP API Top 10 coverage, automated scanning, penetration testing

• Secrets management — HashiCorp Vault, AWS Secrets Manager, environment-based configuration

• API Management & Governance: Deploy API management platforms — Kong Konnect, Tyk, Azure API Management, or AWS API Gateway — providing:

• Developer portal with interactive API documentation

• API key and subscription management

• Usage analytics and monitoring dashboards

• Version management and deprecation policies

• API lifecycle governance from design to retirement

• Integration Platform as a Service (iPaaS): For complex multi-system integrations, we implement Workato, MuleSoft, Boomi, or open-source alternatives like Apache Camel and Node-RED — connecting cloud and on-premise applications with pre-built connectors and visual workflow designers.

API Integration Patterns

Pattern	Description	Use Case
Point-to-Point Sync	Direct REST/gRPC call	Simple, real-time integrations
Message Queue	Async via Kafka/RabbitMQ/SQS	High-volume, decoupled systems
Event Bus	Pub-sub event streaming	Real-time data propagation
File-Based	SFTP, S3, EDI batch processing	Legacy system integration
Change Data Capture	Database change stream processing	Real-time data sync between databases
Webhook	HTTP callbacks on events	Third-party service notifications
API Orchestration	Multi-step workflow across APIs	Complex business processes

the country-Specific Integration Considerations

• Tally Integration: Tally is the dominant accounting software for the countryn SMEs. Our team has deep expertise integrating Tally with e-commerce, POS, and ERP systems via Tally XML/JSON APIs.
• Compliance APIs: Integration with Suvidha Providers (GSPs) for e-invoicing, e-way bill generation, GSTR filing, and input tax credit reconciliation — critical for businesses.
• & KYC: eKYC integration via UIDAI-registered AUA/KUA for identity verification, demographic auth, and offline XML verification.
• Account Aggregator: RBI’s AA framework integration for consent-based financial data sharing — the future of the countryn digital lending and personal finance management.

Let our API team design and build the integration layer that connects and scales your business. Contact us for an API architecture consultation.