// Backend Runtime
Node.js
Our primary backend runtime for API and service development.
120+ Simplileap projects · 5+ years hands-on
// Overview
How we use Node.js
Node.js powers most of our backend API work, the non-blocking I/O model, TypeScript native support, and the npm ecosystem make it highly productive for API-first backends, real-time services, and integration platforms.
// Use cases
- REST and GraphQL APIs
- Real-time WebSocket servers
- Integration and webhook services
- Background job processors
- CLI tools and automation scripts
// Why it matters
TypeScript native
First-class TypeScript support with ts-node and esbuild, no context switching between languages in full-stack TypeScript projects.
Non-blocking I/O
Handles thousands of concurrent connections efficiently, the right model for API servers that primarily perform I/O rather than CPU computation.
npm ecosystem
The world's largest package registry provides solutions for virtually every integration need, from AWS SDK to payment gateways to PDF generation.
// Production patterns
How we ship with Node.js
Express or Fastify APIs with Zod validation, structured logging (pino), and OpenTelemetry hooks on every outbound integration, payment gateways, CRM webhooks, and chain indexers included.
Webhook handlers are idempotent by design: store event IDs in PostgreSQL, return 200 only after durable write, and reconcile async with dead-letter queues for partner retries.
For crypto and fintech clients we have shipped TRC20 and ERC-20 deposit listeners, polling chain APIs with cursor checkpoints, normalising amounts, and matching internal ledger entries before crediting user balances.
The full custody and chain-data stack behind this work is detailed on our Fintech & Crypto industry page ›.
// Integrations
- Fireblocks webhook reconciliation
- Razorpay / Stripe payment events
- Salesforce Platform Events
- NetSuite RESTlets
- BullMQ job workers
// FAQ
Node.js: common questions
Express or NestJS?+
Express/Fastify for most APIs, lighter and faster to hire for. NestJS when enterprise teams mandate module patterns and DI consistency.
How do you secure webhooks?+
HMAC signature verification, timestamp tolerance, IP allow lists where partners support it, and replay protection via idempotency keys.
Node vs Python for AI backends?+
Node when tight coupling with Next.js BFF; Python when LangChain, pandas, or model-serving ecosystems are primary.
// Company and service positioning
Company and Service positioning is reviewed for production delivery standards by Harsha Parthasarathy (Co-Founder, Strategy & Operations 24+ years IT veteran, IBM, Global Delivery, Program Management) and Keshav Sharma (Co-Founder, Engineering and Lead Architect, Full-stack engineering, product delivery and technical standards).
// Related services