Marcin
I'm Marcin Świerczyński. I fix and build websites for small businesses, and turn dull office work into scripts, spreadsheets and reports that run themselves. You get all the code.
Based in Poland, working US hours by e-mail. Card, PayPal or bank transfer, invoice with every job.
Not sure what to choose? Describe the problem in a few sentences and I'll tell you what makes sense. Write to me
Thirteen projects, starting with what small businesses ask for most. The businesses in the demos are made up and each project says so; the apartment in Gąski is a real, paying client. All the code is on GitHub, and you can scroll the live sites right here.
Four one-page sites for made-up US businesses: a dentist, a heating and plumbing company, a CPA firm and an auto repair shop. Each has its own look and one thing to try: when your next cleaning is due, a work order that fills in with prices, a fee estimate, what a dashboard warning light means. All four have click-to-call, hours, prices, a contact form and business details Google can read.
A small business site that was broken, and the same site after the fixes. Photos went from 4.9 MB to 303 KB, the layout works on a phone, the form does something and the Polish letters look right. Performance 75 → 92–100, accessibility 45 → 100 in Lighthouse.
Lighthouse on a phone. Check it yourself
A 15–20 second ad made from a logo, three or four services and a phone number, cut twice: vertical for Reels, Shorts and TikTok, and wide for a website or YouTube. The captions move with the words, so it works with the sound off. Two made-up clients went through the same template; a new client is one new settings file.
A help box on the site of a made-up dental practice. Ask whether they take MetLife or say your tooth is killing you, and it answers from the practice's own FAQ, typos and all, with the phone and booking link one tap away. When it doesn't know, it hands you to the front desk and saves the question for the owner. It runs in the browser, so there's no AI bill and nothing leaves the visitor's device; an AI model can be added later.
32 automated tests, run on every code change. Results on GitHub
Three automations that live inside a business's own Google account. Fill in a row and pick Send from the menu: the client gets a numbered PDF from your own template and the sheet records the link. Website form messages land in a sheet with an automatic reply, and every Monday you get the ones nobody answered. Appointment reminders go out 24 and 2 hours before, once each. The picture is an illustration; the code and tests are real.
29 automated tests, run on every code change. Results on GitHub
Four messy exports from Square, Shopify and QuickBooks for a made-up coffee roaster, turned into one monthly report: sales by month, channel, category and customer, with charts. It reads every date and money format those exports use, drops duplicates from overlapping downloads and lists every row it left out and why, so the totals can be checked.
23 automated tests, run on every code change. Results on GitHub
Pulls a book catalogue from a scraping-practice site and saves it as CSV, JSON or Excel. If the site doesn't answer it tries again, and it pauses between requests so it doesn't hammer the server. The parser has tests, so a change to the page layout won't break it silently.
6 automated tests, run on every code change. Results on GitHub
Three shops, three different exports: other column names, stray spaces, duplicates. The script merges them into one sheet and adds a list of what it fixed. Dates written as 05/03 cause the most trouble, since nobody can tell May from March, so you can tell it which file writes the day first.
12 automated tests, run on every code change. Results on GitHub
An invented bike shop in Bristol. Most of the time went into the price list: click a job and the repair ticket beside it fills in with the price and the ready-by time. The booking form checks its fields but sends nothing, because it's a demo.
Lighthouse on a phone. Check it yourself
An invented cosmetics brand built on Baltic amber. The whole dark page circles one object: an amber stone drawn in SVG, with light that follows the cursor. The photographs of the raw material are real and the product's full ingredient list is shown.
Lighthouse on a phone. Check it yourself
The website of a real seaside apartment, with a booking calendar. Guests pick dates and get a ready-made e-mail with them filled in. The owner has no admin panel: they mark booked days on their side and upload an availability file. The exact address is given only after a booking is confirmed.
„Great website. It helped me sell on Booking and caught clients' attention.”
A booking-request system for a small apartment. A guest picks dates on a calendar, sees the price and sends a request, and the owner confirms, declines or blocks dates in a panel. It runs on a real server with a database and automated tests. The online version runs in the browser and keeps data only on your side, the panel password is demo.
19 automated tests, run on every code change. Results on GitHub
Lighthouse on a phone. Check it yourself
POST /api/auth/register
POST /api/auth/login
GET /api/tasks
PATCH /api/tasks/:id
GET /api/notes
GET /api/stats/summaryA mobile app for students with its own server: tasks, notes and stats. JWT login, data in MongoDB. There's no version to click through, so what's left is the code and the list of endpoints.
Tick what you need. The price updates as you go.
from990
USD
Approximate, in US dollars. You get the final price by e-mail before I start.
Send enquiryYour mail program will open. If nothing happens, write to marcin.strony.www@gmail.com
You write, you get a price and a date, then I get to work.
The Gąski apartment is a paying site for a family business; the other projects are my own, built to the same standard and with the code public. Because I'm early, every data job starts with a free sample and every website with a free sketch, so you see the work before you pay a cent.
The figures in the estimate are starting prices for small projects. I give the exact price by e-mail before I start, and it doesn't change while the scope stays the same.
What you can check yourself: a site that works on a phone and has https, a Lighthouse score you can measure without me, and a price that doesn't grow while the scope stays the same. I don't promise first place on Google or a set number of customers, because nobody can honestly guarantee that.
Yours. You get every file, and I can put the site on your own account, on a domain registered to you. Nothing depends on me, so any developer can make the next changes without my help.
On free hosting that allows business sites by default, e.g. Cloudflare Pages or Netlify, set up in your name. If you already have hosting or a domain, I'll connect it for $25.
Small fixes are included. Bigger changes I quote separately, also up front.
I only take what anyone can see on a public page without logging in, I don't work around CAPTCHAs or blocks, and I don't collect personal data: a lead list holds company details, not people's. I keep request rates low so I don't load anyone's server. If something looks doubtful I'll say so straight away.
Poland, Central European Time. I answer every e-mail within one working day, so a message from the US gets a reply by your next morning.
By card through a payment link, by PayPal, or by bank transfer, in US dollars or euros. You get an invoice for every job.
A few sentences are enough. I reply by e-mail with a price and a date.
Prefer to talk? Write to me and we'll agree a time for a call.