RH
Ragib Hasan
Independent engineering
Available now, and I take one project at a time

Websites,storefronts,andAItoolsthathold upunderrealtraffic.

I am a backend engineer who builds the whole thing: the page people land on, the checkout that takes their money, and the systems underneath that keep it standing at three in the morning. Fixed scope, fixed price, one project at a time.

0+
stores running in production
0K+
transactions a month
0.0%
uptime
Next.jsNode.jsPostgres / MongoDBAWSKubernetesLLM integrations
What I build

Five ways to start, all priced up front.

No hourly billing and no open-ended retainers. You get a fixed number, a fixed date, and a written list of what is and is not included before anything begins.

01Launch

Marketing Site or Landing Page

A fast, honest page that says what you sell and asks for the business.

from $650
7 to 10 days
  • Up to five pages, designed and written
  • Copy drafted from one 45 minute call, yours to edit
  • Mobile first, 90+ on Core Web Vitals
  • Contact or booking form wired straight to your inbox
  • Analytics and a working sitemap from day one
  • Deployed to your domain with SSL
Good for

Businesses running on a template, a social page, or nothing at all.

Talk about this one
02Sell

E-commerce Build

A storefront that takes payment reliably, and an admin your staff can actually use.

from $2,200
3 to 4 weeks
  • Product catalogue with variants and stock tracking
  • The payment gateway you want, live and tested end to end
  • Order flow with email notifications at every step
  • Staff dashboard that needs no developer to operate
  • Migration of up to 200 products from your current setup
  • Two weeks of hands-on support after launch
Good for

Retailers outgrowing a marketplace listing, or paying a platform per sale.

Talk about this one
03Automate

AI Agent or Internal Tool

One workflow your team repeats all day, handed to software that does not get tired.

from $1,200plus $200 a month to run and tune it
2 to 3 weeks for the first workflow
  • One workflow scoped end to end before any code is written
  • Grounded in your documents, prices, and policies
  • A clean handoff to a human the moment it is out of its depth
  • Runs on your data, hosted wherever you want it
  • A dashboard showing what it handled and what it escalated
  • Monthly tuning as the business changes
Good for

Quoting, invoice and document extraction, internal lookups, and the repetitive process a person is doing by hand today.

Talk about this one
04Answer
Most asked for

Messages and Calls, Answered

The enquiries arriving on Instagram, Facebook, WhatsApp and the phone, answered in seconds, day or night.

from $900plus $250 a month to run, tune and support it
2 to 3 weeks
  • Instagram, Facebook and WhatsApp in one inbox, on the official APIs
  • Answers your real prices, hours and policies, never invented ones
  • Books, quotes, and captures a name and a number from every enquiry
  • You take over any conversation mid-sentence and it stops instantly
  • Anything sensitive is escalated to you, never answered
  • Optional voice agent that answers the phone and takes the same details
  • Every message and every decision logged, so you can see what was said
Good for

Salons, clinics, gyms, restaurants and shops where the enquiries arrive as messages all day and a missed one is a booking someone else got.

Talk about this one
05Fix

Rescue and Technical Audit

Something already exists, and it is slow, expensive, or falling over.

from $350
3 to 5 days
  • A full read of the codebase and the infrastructure bill
  • Findings ranked by what they cost you, not by what is interesting
  • The single highest-value fix implemented, not just described
  • A written plan you can hand to any developer
  • No obligation to hire me for the rest of it
Good for

Sites that time out under load, hosting bills that outgrew the business, projects a previous developer walked away from.

Talk about this one

These are introductory rates while I build a public track record on work of this size. They will go up. A price quoted now is honoured for that project whatever happens later.

Nothing here fits? The first call is free and thirty minutes is usually enough to work out whether there is a project worth quoting.

Proof

Systems already carrying real money and real load.

These are production systems, not portfolio pieces. Client names are held back, the numbers are not.

Case 01

500+ online stores on one platform

A commerce platform where every merchant needs their own data, their own domain, and their own payment setup, with none of it leaking between them.

I designed and built the whole backend on my own: six services, a separate database per merchant, four payment gateways, and the monitoring to prove it stays up.

Node.jsMongoDBRedisRabbitMQKubernetesAWS
0+
active stores in production
0.0%
uptime
0%
less database load after caching
Case 02

An ERP running a national distributor

The largest electronics distributor in the country, moving stock across dozens of locations with spreadsheets holding it together.

Architected the system from nothing: twenty-plus modules covering purchasing, stock, sales, and reporting, built for staff who are not technical and will not be trained twice.

Node.jsNext.jsMongoDBRedisDockerAWS
0+
concurrent users
0%
operational efficiency gain
0+
locations tracked live
Case 03

Ticketing that survives the on-sale rush

Thousands of people hitting the same seat map in the same minute, all of them expecting the seat they clicked.

Real-time seat selection with conflict resolution so two buyers never walk away with the same seat, and a payment path that keeps clearing while the traffic peaks.

Node.jsReactSocket.ioStripeRedis
0K+
concurrent buyers at peak
0.0%
payment uptime
Real time
seat locking, no double bookings
Case 04

A platform that took 45 seconds to wake up

Database connections were being exhausted under ordinary traffic, and cold starts had crept up to three quarters of a minute.

Traced it to eager per-tenant connection setup, moved to lazy initialisation with LRU eviction, and brought the ceiling down without adding a single server.

Node.jsMongoDBConnection poolingLRU caching
0%
fewer peak connections
45s to 3s
cold start
$0
extra infrastructure spend
Want to see how the thinking works before you hire?Read the engineering write-ups
Why me

One person, start to finish, on the hook for all of it.

An agency gives you an account manager and builds it with whoever is free that month. This is the other arrangement: you brief the person who writes the code, and that person stays responsible for it afterwards.

You deal with the person building it

No account manager, no handover to a junior after the contract is signed, no game of telephone between you and whoever is actually writing the code. The person you brief is the person who builds it and the person who fixes it.

A to Z, and the buck stops here

Design, build, the payment gateway, the hosting, the domain, the email, the analytics, the thing that breaks three weeks later. One person owns all of it, so there is nobody to point at when something goes wrong.

Systems that already survive real load

The platforms behind this are not portfolio pieces. They run 500+ stores and over 100,000 transactions a month in production. A five page site is not going to fall over, and when the business grows the person who built it has done the bigger version before.

Nothing is farmed out

No white-labelled subcontractor in another timezone, no template bought and reskinned, no plugin stack held together with hope. If it is in the scope, it was built here, and it can be explained line by line.

Straight answers, including no

If a project is a bad idea, or cheaper done another way, or genuinely not worth doing, that is what you get told on the first call. Turning down work that will not succeed is cheaper for both of us than delivering it.

The trade is honest and worth saying: one person is not a team. A project needing five people in parallel is a project for an agency, and you will be told that on the first call rather than three weeks into it.

How it runs

Four steps, and you can see the work the whole way through.

Most bad software projects go wrong in the gap between the quote and the first look at something real. This closes that gap to about a week.

A 30 minute call

You describe the problem. I tell you honestly whether I am the right person for it and roughly what it costs. No deck, no pitch, no follow-up sequence.

Scope and price in writing

One document: what gets built, what explicitly does not, when it lands, what it costs. The price does not move unless the scope does, and any change is quoted before work starts on it.

Build in the open

A working link from the first week, updated as it goes. You watch it take shape instead of reading status reports, so you can redirect early while redirecting is still cheap.

Launch, then thirty days

I deploy it, hand over every credential and the full codebase, and stay on for thirty days of fixes at no extra cost. A monthly care plan after that, only if you want one.

Fixed scope, in writing

The price only moves if you change what you asked for, and any change is quoted before work starts.

You own everything

Code, repository, domain, hosting accounts, all handed over in full on the final payment.

Thirty days after launch

Anything that breaks in the first month gets fixed at no cost. That is the deal, not an upsell.

Straight answers

The things people ask before they commit.

If your question is not here, ask it in the form below. A direct answer costs me nothing and saves us both a call.

Half up front, half on delivery. The audit is the exception: it is small and fast enough that it is paid in full up front.

Start here

Tell me what is broken, or what you want to exist.

A few sentences is plenty. I read every one myself and reply with either a real answer or an honest no.

Replies within one working day
GMT+6, with daily overlap across Europe and the US morning
hello@rsupanta.com
No newsletter, no CRM sequence. Just a reply.