You will get your slow Node.js API and MongoDB queries fixed and optimised
Project details
You will get your slow Node.js API and MongoDB queries profiled, diagnosed and fixed, with real numbers showing the difference.
This is work I have done at scale. On one product I scaled the backend from 200,000 to over a million users and cut average API response time by around sixty percent by fixing indexes, rewriting queries and adding caching in the right places. On another product with hundreds of millions of users, I removed API timeouts and high database CPU the same way.
How I work: I profile first and guess never. I look at your slow endpoints, run explain on the queries, check your indexes, find N+1 patterns and unbounded queries, and check where memory and CPU actually go. Then I send you a short report saying what is slow and why, before I change anything.
Fixes typically include correct compound indexes, rewritten aggregation pipelines, pagination and projection, Redis caching for read-heavy routes, connection pool tuning, and removing blocking work from the request path.
You get before and after numbers, not just a claim that it is faster.
This is work I have done at scale. On one product I scaled the backend from 200,000 to over a million users and cut average API response time by around sixty percent by fixing indexes, rewriting queries and adding caching in the right places. On another product with hundreds of millions of users, I removed API timeouts and high database CPU the same way.
How I work: I profile first and guess never. I look at your slow endpoints, run explain on the queries, check your indexes, find N+1 patterns and unbounded queries, and check where memory and CPU actually go. Then I send you a short report saying what is slow and why, before I change anything.
Fixes typically include correct compound indexes, rewritten aggregation pipelines, pagination and projection, Redis caching for read-heavy routes, connection pool tuning, and removing blocking work from the request path.
You get before and after numbers, not just a claim that it is faster.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$200
|
Standard
$450
|
Advanced
$900
|
|---|---|---|---|
| Delivery Time | 3 days | 6 days | 10 days |
Number of Revisions | 0 | 0 | 0 |
Bug Investigation | |||
Fix Documentation | |||
Detailed Code Comments |
About Shahid
Blockchain Backend Developer | Solidity, Node.js
Islamabad, Pakistan - 12:39 am local time
Two things I do well: I build the smart contracts and backend services behind Web3 products, and I test mobile apps the way someone who has shipped them tests them.
WHAT I HAVE SHIPPED
• DOP — Data Ownership Protocol: backend services for a privacy protocol that raised $185M in its private sale and grew to 300M+ users. Killed API timeouts and high MongoDB CPU with indexing and Redis caching. Removed RPC downtime by integrating 5 providers with randomized selection and automatic failover.
• Tomi: Solidity smart contracts and Node.js services for a Web3 ecosystem with 1M+ users. The TOMI token went from $0.10 to $7 after launch.
• TheCryptoBasic: backend for a crypto news and market-data platform serving 2M+ users.
• Rain: backend contribution to a blockchain project that raised $1M in its private sale.
• CV Maker (Google Play): scaled a Node.js backend from 200K to 1M+ users and cut average API response time by around 60 percent.
• Arrow Maze Pro: my own iOS puzzle game, built in SwiftUI and published on the App Store.
BLOCKCHAIN & BACKEND
• Smart contracts — ERC-20, ERC-721, ERC-1155, staking, vesting, presale and launchpad, NFT minting, token distribution
• Web3 backend — Node.js, Express, MongoDB, Redis, REST APIs, event listeners, indexers, wallet authentication
• dApp integration — ethers.js and web3.js, multi-RPC failover, transaction monitoring and retries
• Performance rescue — slow APIs, database timeouts, high CPU, memory leaks at scale
• Production firefighting — failed payments, dropped transactions, JWT and session bugs, silent errors
MOBILE APP TESTING & QA
• Google Play closed testing — 12 real testers on real devices, continuous 14-day opt-in, genuine in-app activity, plus a written feedback report for your production review submission
• Functional, smoke and regression testing on real Android and iOS devices
• UI and layout testing across screen sizes and OS versions
• Payment, login and session-flow testing — I have fixed those exact bugs in production myself
• API testing with Postman, because most app bugs start below the UI
• Bug reports with steps to reproduce, expected vs actual, screenshots, screen recordings, device and OS details
• Test case documentation and a clear test summary report
I worked as an SQA Engineer for a year and a half before moving into backend development, so testing is not a side gig for me.
TECH
Solidity, Node.js, Express.js, MongoDB, Mongoose, Redis, JavaScript, TypeScript, ethers.js, web3.js, SwiftUI, Postman, Google Play Console, TestFlight, Git.
I reply within a few hours and work 30+ hrs/week. Message me what you are building or what you need tested, and I will tell you honestly if I am the right fit and how long it will take.
Steps for completing your project
After purchasing the project, send requirements so Shahid can start the project.
Delivery time starts when Shahid receives requirements from you.
Shahid works on your project following the steps below.
Revisions may occur after the delivery date.
Profile, report, fix and benchmark
I profile your API and database, send a short report of what is slow and why, apply the fixes, then give you before and after numbers for each endpoint.