Md Nasim Sheikhnasimstg.devI build backends, CI/CD pipelines, and interfaces, from system design through production. Recently at AzoozGAT: −30% bundle, −75% DB ops, and −24% load time.
What I ship
I take projects end-to-end. Pick a lane below, or describe what you need. I’ll tell you honestly whether it’s a fit.
Dashboards, portals, and cross-platform mobile apps with real auth and real data behind them. Built around how your team actually works, from an empty repo to a deployed product.
The senior layer: database design, secure APIs, and deploy workflows that keep working once real traffic and edge cases show up.
AI features grounded in your own data: answering questions, summarising content, or automating a real workflow, built to hold up in production.
Send me a sluggish site and I find the bottleneck and ship the fix. A recent refactor cut the bundle 30% and load times 24%.
Stop deploying by hand. I set up automated testing and zero-downtime pipelines so every change ships safely and predictably.
Snapshot
A retrieval-grounded AI assistant embedded in this site that answers questions about my work without hallucinating - and demonstrates the exact RAG + intent-router architecture clients hire me to build.
50+
Projects shipped
4.4/5 avg client rating
Bangladesh (UTC+6) · Remote-first
9:31 PM my time · global clients welcome
30%
Bundle size cut
AzoozGAT platform
75%
Fewer DB ops
Per-session avg
54★ 12
Public repos · pushed 3mo ago
@nasimstg · C++, JavaScript, C, TypeScript
Currently building
Quiz & learning platform at AzoozGAT (Next.js + Firebase)
Experience
Sep 2025 - Present
Remote
Leading engineering on the AzoozGAT quiz and learning platform. Architecture, performance work, payment integration, and team direction.
Nov 2022 - Jan 2025
Remote
Freelance - Upwork, Fiverr, Freelancer
Delivered 50+ full-stack MVPs with a 90%+ client satisfaction rate.
Jun 2022 - Nov 2022
Remote · Singapore (APAC)
Backend work on payment-processing flows at WEX, a global fintech for fleet cards, corporate payments, and benefits.
Mar 2022 - Jun 2022
Remote · Singapore (APAC)
Built and QA-tested internal web features for WEX's payments tooling with the Singapore team.
Selected work
A retrieval-grounded AI assistant embedded in this site that answers questions about my work without hallucinating - and demonstrates the exact RAG + intent-router architecture clients hire me to build.
Encrypt, commit, and inject .env secrets - a blazing-fast CLI with AES-256-GCM encryption, X25519 team sharing, and zero cloud.
Open-source, gamified learning platform - RPG-style skill trees you can build, share, and level up through, with community-curated resources.
A research project that fine-tunes a 4-bit-quantized small language model to detect cyberbullying in Banglish (Bengali written in Latin script) - sized to run offline and on-device, without sending messages to a server.
Tech
Day-to-day tooling, picked to fit the job. These are the ones I’ve shipped production work with.
What clients say
“On our payment-processing paths he made request handling idempotent and cut redundant database calls without breaking a thing. He's careful with the fintech edge cases that actually matter, clear in code review, and reliable across time zones.”
Wei-Lin Tan
Senior Backend Engineer · WEX (APAC)
“He took Budee from a Figma file to a working budget app on a tight timeline. Pragmatic scope calls, clean TypeScript, and he flagged the risky parts before they turned into problems instead of after.”
Marcus Reilly
Founder · Budee.io
“Two projects, both shipped exactly to scope and then some - Google and Meta Ads wired in cleanly and measurable from day one. One of the most dependable engineers we've hired on Upwork.”
Priya Nair
Product Manager · B2B SaaS startup
“xenvsync replaced our half-broken dotenv sharing overnight - end-to-end encrypted, no cloud in the trust chain, and an audit log that actually reads clearly. Rare to find open source this thoughtfully built.”
Tomas Novak
Platform Engineer · Series-B fintech
“We needed a recovery app that stayed private and worked offline. Nasim delivered crisis help at a tap and role-based support across recovery types - and he genuinely cared about the people on the other side of the screen.”
Sarah Whitman
Program Director · Recovery non-profit
Engagement
Open about availability and rates so you can decide fast. Currently leading AzoozGAT, open to new roles and select freelance work. Flexible start.
Remote-first · open to onsite & relocation for the right role
| Freelance / contractScoped or hourly | From $40/hr |
| Fixed projectMVPs, integrations, audits | From $3,000 |
| Full-time roleRemote · negotiable | $50k–80k / yr |
| Part-time / retainer~20h/week | From $1,500 / mo |
USD. Rates flex with scope, length, timezone, and equity. Internships welcome, let's talk.
How we work together
A clear, repeatable process, so you always know what’s happening and what comes next.
We talk through the actual bottleneck, then I map the technical plan and data model before writing a line of code. You approve the approach first.
I build in the open. You get a live staging link every week to see real progress and steer early, instead of a status report at the end.
It ships on automated, zero-downtime pipelines with a clean handoff, so future changes stay easy and low-risk whether I make them or your team does.
Two paths, same inbox
Send a two-line overview of what you’re building or hiring for, and I’ll reply with an honest take on fit, scope, and timeline. I usually reply within 24 hours.