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Fiverr Pro
English
$
USD
I will optimize slow nodejs API, mongodb queries and backend performance
Adeel Gill
About this gig
Your API was fine at 500 users. Now it times out.
Most of the time it isn't the server. It's one query scanning an entire collection, an index that was never added, or a loop hitting the database once for every row it returns.
I'm a full-stack engineer with 8+ years on Node.js, Express and MongoDB. I find what's actually slowing you down, and I show you the numbers instead of asking you to take my word for it.
How it works:
1. Profile - I measure where the time really goes
2. Diagnose - explain plans, slow query logs, request traces
3. Fix - indexes, rewritten aggregations, N+1 removal
4. Benchmark - your endpoints, before and after
5. Document - what changed, and why
Stack: Node.js, Express, NestJS, Python, FastAPI, MongoDB, SQL, Mongoose, Redis, AWS, NGINX
Not comfortable giving code access yet? Start with the Basic Audit - you get the full diagnosis plus the exact indexes and rewrites for your developer to apply.
I won't quote you a percentage. How much you gain depends on your data, schema and infrastructure. What you will see is the real before and after on your own endpoints.
Send me your stack and the endpoint that's hurting before you order.
Get to know Adeel Gill
Adeel Gill
Senior Software Engineer
- FromPakistan
- Member sinceJan 2020
- Avg. response time1 hour
Languages
English
Senior Software Engineer and Tech Lead with 9+ years of experience building scalable backend, SaaS, and healthcare applications. I specialize in Node.js, TypeScript, MongoDB, Angular, GraphQL, REST APIs, AWS, Kafka, and Redis. I've led 7–10 engineers and worked on an EHR platform serving 250+ healthcare facilities. I specialize in MongoDB and API performance optimization, including complex aggregation pipelines with 20+ nested lookups. I build clean, scalable solutions and can develop, fix, optimize, or modernize existing applications.
My Portfolio
FAQ
What access do you need from me?
For the Basic Audit, read-only is enough - your schema, the slow endpoint's code, and a slow query log or explain output. For Standard and Premium I need repo access and a staging or test database. I never need production write access to start.
I don't want to share my code. Can you still help?
Yes. The Basic Audit is built for that. Send the query, the schema and the timings, and you get the diagnosis plus the exact indexes and rewrites for your own developer to apply.
How much faster will my API be?
I can't answer that honestly before I've looked. Gains depend on your data volume, schema and infrastructure. What I do commit to is measuring your endpoints before and after, so you see the real numbers rather than a promise.
What counts as a revision?
Corrections to what I delivered, if something doesn't behave the way I documented it. New endpoints, new queries or a new performance target are a new order - message me and I'll send a custom offer.
Which package should I pick?
One slow endpoint and you're not sure why: Basic. You know what's slow and want it fixed: Standard. Several endpoints slow, or slowing down as you grow: Premium.
Do you only work with MongoDB?
No. MongoDB and Mongoose are my strongest area, but I work with SQL databases too, and with Node.js, Express, NestJS and Python/FastAPI backends. Send me your stack before ordering and I'll tell you straight if it's a fit.
What if the problem turns out to be infrastructure, not code?
Then I'll tell you, and show you the evidence. Sometimes the fix is a bigger instance or a connection pool setting, not a query. You still get the full diagnosis - I won't rewrite code that isn't the cause.
Will your changes break anything?
work on a branch, not your main. You get a diff you can review and roll back. Index additions are non-destructive, and I flag anything with a behavioural risk before I do it.
