# Hire a Node.js backend developer

URL: https://shahid09.is-a.dev/hire/nodejs-backend-developer/
Author: Muhammad Shahid, Senior AI Software Engineer & Backend Developer (https://shahid09.is-a.dev/)

APIs and backend services that stay fast and stable when your traffic multiplies, from a developer who has fixed slow queries and outages on live products with millions of users.

**Quick answer:** I build and scale Node.js backends with Express, NestJS, TypeScript, MongoDB and Redis. I worked on the backend of DOP ($185M private sale, 300M+ users), scaled CV Maker from 200K to 1M+ users with about 60% faster APIs, and build Solidity contracts and Web3 services.

## What I build

- **REST and GraphQL APIs:** Clean structure, validation, authentication, centralised error handling and logging.
- **Performance and scaling rescue:** Slow queries, timeouts, high CPU and memory: profiled and fixed, usually without a rewrite.
- **Data layer design:** MongoDB schemas and indexes, aggregation pipelines, Redis caching and pagination.
- **Microservices and events:** Services that talk through APIs, events and queues, with reliable background jobs.
- **Web3 backends:** Solidity smart contracts, on-chain event indexing and multi-RPC failover.
- **Cloud and CI/CD:** Docker, AWS, automated build-test-deploy pipelines and zero-downtime releases.

## Results on real products

- **DOP (Data Ownership Protocol):** $185M private sale · 300M+ users — Read-heavy endpoints were timing out and MongoDB CPU was near its ceiling. Compound indexes and a Redis cache fixed it, and 5 RPC providers with failover ended transaction downtime.
- **CV Maker – Resume Builder:** 200K → 1M+ users — Indexing, aggregation pipelines, response caching and pagination cut average API response time by about 60% while releases stayed downtime-free.
- **TheCryptoBasic:** 2M+ users — Maintained the backend of a crypto news and market-data platform and fixed the JWT session bugs that were logging users out at random.

## Tools I use

Node.js, Express, NestJS, TypeScript, MongoDB, Redis, GraphQL, Solidity, AWS, Docker, CI/CD

## How a project works

1. **Scope call.** We talk through the goal, the current state of the product and what success looks like.
2. **Written plan.** You get fixed milestones, delivery dates and a clear price before any work starts.
3. **Build in small pieces.** I ship in small steps with regular progress updates, so you always see what is built.
4. **Tested delivery.** Delivery includes tests, documentation, handover and free support afterwards if something breaks.

## Frequently asked questions

### Can you fix a slow API without a rewrite?

Usually, yes. I profile the slow endpoints first, then fix the real cause: missing indexes, heavy queries, missing caching or blocking work. At DOP and CV Maker this was enough to handle millions of users.

### Can you take over an existing codebase?

Yes. I read the code, map the risks and fix the urgent problems first, then improve the structure step by step without stopping releases.

### Do you use TypeScript and NestJS?

Yes. I write TypeScript for Node.js backends and use NestJS as well as Express.

### Which databases do you use?

Mainly MongoDB with Redis for caching. I design schemas and indexes for the queries the product actually runs.

### Do you build Web3 and blockchain backends?

Yes. I have written Solidity contracts and Node.js services for Tomi (1M+ users) and worked on the backends of DOP and Rain.

### Do you handle deployment and DevOps?

Yes. I containerise services with Docker, deploy on AWS, Heroku or a VPS, and set up CI/CD so every change is tested before it reaches production.

## Tell me what you want to build

Send the details on WhatsApp or by email: what you need, where the project is now, your deadline and budget range. You get a clear plan and price back, usually within 24 hours.

WhatsApp +92 321 7815799 · contacttoshahidkhan@gmail.com · Upwork: https://www.upwork.com/freelancers/~014a63f2391f4f4bce