APIs · Integrations · Webhooks

API Development & Integration

Production APIs and third-party integrations — built with contract-first design, OpenAPI specs, retry semantics and full observability.

120+

Integrations shipped

< 80ms

P95 latency

100%

Documented endpoints

Capabilities

What you get

OpenAPI 3.1 contract-first delivery
GraphQL federation across services
Idempotent webhooks with replay
OAuth 2 / OIDC and API key gateways

Engineering stack

Battle-tested tech

Node.js
FastAPI
Apollo
Kong
Postman

Custom APIs · Webhooks · Integrations

Documentation-grade APIs, predictable contracts

Endpoints · v1

GET/v1/orders200
POST/v1/orders200
PATCH/v1/orders/:id200
DELETE/v1/orders/:id200
POST/v1/webhooks200

OpenAPI 3.1

OAuth2 · JWT

Idempotency

200 OK · application/json

~12ms

{
  "id": "ord_8f2a91",
  "status": "filled",
  "symbol": "RELIANCE",
  "qty": 250,
  "px": 2987.45,
  "ts": "2026-05-04T09: 15: 01Z",
  "venue": "NSE",
  "fees": { "stt": 7.47, "exch": 0.21 }
}

Webhook delivery

Signed payloads · exponential backoff · dead-letter queue · replay UI

OpenAPI-first

Generated SDKs, typed clients

Rate-limited

Per-key quotas, burst & sustained

At-least-once

Idempotency keys + DLQ replay

Institutional Framework

API Engineering methodology — contract-first

Contract Discovery & ADRs

Senior architect-led discovery capturing domain models, OpenAPI specs, and integration topology.

Spec-driven trunk delivery

OpenAPI-first development, mandatory breaking change checks (Spectral), and versioned deployments.

API Observability

Every API ships with per-route latency tracking, error-rate dashboards, and usage quotas.

Validation gates, not vibes

Spec compliance, contract testing, and performance budgets are mandatory CI gates for every API release.

Technical Specifications

What runs underneath

Polyglot API Architecture — TypeScript and .NET 8 services, OpenAPI 3.1 contracts, GraphQL federation, and event-driven webhook replay systems.

API Protocol

REST (OpenAPI), GraphQL, gRPC

Authentication

OAuth 2.0 / OIDC, mTLS, API Keys

Latency goal

p95 < 80ms for core services

Scalability

Stateless containers with Redis-backed rate limiting

Security & Scalability

API Security posture

Gateway Protection

WAF, rate-limiting, and depth-limited GraphQL queries to prevent resource exhaustion.

Zero-Trust Identity

Short-lived tokens, scope-based authorization, and mTLS between backend services.

Idempotency & Retries

Standardized idempotency keys, exponential backoff, and dead-letter queues for integrations.

Threat Modeling

OWASP API Top 10 aligned security reviews and automated vulnerability scanning in CI.

Delivery Architecture

How it ships — blueprint to production

A production-grade API gateway architecture with robust documentation and integration testing.

Reference architecture

Client edge → API gateway → services → data plane

Cross-cutting · Observability · Security · CI/CD · IaC

Integration touchpoints

Gateways

Kong, Apigee, AWS API Gateway

Data plane

MySQL, Redis, MongoDB

Platform

AWS / GCP / Azure landing zone

Observability

OpenTelemetry → Datadog / Grafana

Documentation

Stoplight, Redocly, Swagger

Delivery

GitHub Actions, Terraform, ArgoCD

Execution timeline

01
Week 0–2
Contract Audit
Senior architect captures domain specs, auth requirements, and API topology.
02
Week 2–6
Gateway Found.
Gateway setup, auth integration, and the first contract-compliant vertical slice.
03
Week 6–12
Iterative Build
Two-week sprints focused on domain services, webhook replay, and documentation.
04
Week 12+
Hardening & Go-live
Load tests, security review, runbooks, and production cutover.

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