Open to remote roles · Full-time or contract · Available immediately
Backend engineer · Full-stack · LLM systems
I build backends that hold up in production: search across millions of products, payment flows that record every payment exactly once, and LLM features inside real client products. I ship the frontends on top of them too, in Next.js and SvelteKit. Remote for US and Canadian teams since 2025.
Based in India · Available 9:30 AM–7:30 PM UTC (UK/EU and US East overlap)
01Experience
Where I've worked and what I shipped there.
Software Developer · Full-time contract
Full-stack and AI product development for multiple client platforms.
An overloaded single-worker Celery renderer was shipping personalized cards without customers' handwriting, with no error raised. I traced it and fixed it with HTTP 425 + Retry-After holds, backoff retries (3 → 8) and corrected timeouts.
FastAPI services for mask- and point-targeted AI image edits, handwriting transcription, vision-model photo placement, and version history with restore.
Running on a pilot site and built to scale to 30 sites: verified source quotes, per-call AI cost budgets, and lock-guarded, retryable jobs.
Two English/Arabic (RTL) e-learning platforms. I found Stripe webhook signatures were never verified in production (a global JSON parser consumed the raw body first), fixed it, and made payment recording idempotent.
Also shipped: CMS SEO management with EN/ES/FR metadata and a publish gate, and an event-grouped audit history (55 tests across both).
Software Developer · Full-time contract
Software developer on a high-traffic US e-commerce marketplace. Owned the search, the edge API and two frontend rebuilds, across four repositories.
Elasticsearch search with fuzzy matching and around two dozen filters, over a catalog of millions. Results in under a second.
Rebuilt the site SSR-first with 30+ reusable components and proper SEO. PageSpeed went from 60 to 90.
Five new product categories, plus a DynamoDB-backed Mapbox map of dealers across the US that brands can embed on their own sites.
One Cloudflare Worker that every frontend reads from, serving the old and new databases while we moved over.
A Django/DRF CMS and a Celery price/stock sync with batched SQL.
Full-Stack Developer · Independent client work
Shipped two client websites solo, from code to domain to Google indexing.
Frontend Intern (Jul–Sep 2024) → Full-Stack Intern (Sep 2024 – Apr 2025)
My first real job. I worked on client projects in whatever framework the client was already using, and on a Django backend with Stripe payments. Led an intern pod across multiple clients and interviewed incoming interns.
Built and shipped sites in Next.js, Svelte and Angular for LoginRadius and EnrichlyHealth.
Built the Django backend for InPixr with S3 for storage and Stripe for payments. Successful transactions went up 25%.
B.Tech, Electronics · Prayagraj, Uttar Pradesh
02Case studies
Problem, root cause, fix, result. The short version of each, with the detail one click away.
BrightPathDigital
Problem
Delivery quietly served old artwork when a background render failed, so recipients got cards missing their personal content, and nothing raised an error.
Root cause
Fix
Result
Incomplete cards are no longer served silently.
BrightPathDigital
Problem
Webhook signature checks were silently disabled in production.
Root cause
A global JSON body parser consumed the raw request body before the signature check could read it.
Fix
Result
Verified end-to-end with Stripe test-mode payments.
Gun Made
Problem
Search a catalog of millions of products with about two dozen filters, without exposing search credentials to the browser.
Fix
Result
Sub-second results across a catalog of millions.
Gun Made
Problem
Data was moving from a legacy PostgreSQL database to a newer Aurora cluster while the frontends kept running.
Fix
Result
Every frontend read through one API while the data moved over.
03How I work
Available 9:30 AM–7:30 PM UTC, overlapping UK/EU and US East working hours.
Merged 14 PRs and reviewed 14 teammate PRs in my first 3 weeks on an unfamiliar FastAPI + Next.js codebase.
103 tests on Daftaar, and 55 tests across two CMS features at BrightPath.
I care a lot about the next developer being able to follow what I wrote.
04Projects
Things I built on my own to learn how they work, and two client sites I shipped solo.
Students sign up in chat with their date of birth, qualification, field of study and home state. An hourly pipeline collects recruitment notices, a rules-based parser handles them first, and only low-confidence results go to an LLM. The matching engine answers MATCH, MAYBE or NO, so incomplete data never wrongly rules anyone out. Runs for $0 a month on Oracle Cloud's free tier.
Read the case study# each notice has its own reference date,
# that's why we store the DOB and not the age
ref = job.age_as_on or job.apply_end or today
age = age_on(user.dob, ref)
relax = relaxation_for(user.category) # OBC +3, SC/ST +5
if age > job.max_age + relax:
return Verdict.NO, [f"age {age} is above the limit"]
if age > job.max_age: # in, but only just
reasons.append(f"qualifies only with {user.category} relaxation")05Open source
Two of my fixes were merged into mloda, an open source data access framework for AI and ML.
When a reader got a file hint it didn't own, it threw the hint away and rescanned everything, so it could end up reading a different file than the one the caller asked for. Now ReadFile and ReadDocument just decline, and the caller's choice sticks.
Four test failures that only showed up on Windows. All of them came from backslashes being read as escape characters instead of path separators. Fixed with raw strings, as_posix() and re.escape().
06Stack
What I work with, roughly grouped.
07About
How I got into this, the short version.
Open to remote roles
Manish Kumar Singh
Based in India · Available 9:30 AM–7:30 PM UTC (UK/EU and US East overlap)
the crt erachildhood
Games, PowerPoints with far too many animations, and LOGO, where I made a little turtle draw squares over and over. REPEAT 4 [FD 100 RT 90] was the first program I ever wrote, and I still remember how cool that felt.
whatbytes2024 to 2025
The steepest learning curve I've had: Next.js, Django, Node, AWS, Angular, whatever the client was already using. By the end I was interviewing new interns and leading a small pod across a few clients, while still an intern myself.
gun made2025 to 2026
On a busy US marketplace the question stopped being "does it work" and became "will it hold up at 3am with real traffic". I kept search under a second across millions of products and ended up owning four repos and the API in front of them.
brightpathdigital2026 to now
I work remotely for a Canadian consultancy across multiple client platforms. I learned an unfamiliar FastAPI and Next.js codebase and was shipping into it within weeks. Since then I've traced a silent production bug where cards were shipping without customers' handwriting.
on the sidenow
Daftaar, my Telegram bot for government job eligibility, is live with about 30 students. I've also shipped two client sites solo, from the code to the domain to getting them on Google.
I'd rather find the bug nobody noticed than ship the feature nobody asked for.
08Contact
Send me the role and I'll reply within a day. Remote, full-time or contract, available immediately.
Based in India · Available 9:30 AM–7:30 PM UTC (UK/EU and US East overlap)
Message me on WhatsAppOpen to remote roles · Replies within a day