Available for remote contracts & freelance
I'm Marc Stan — a senior full-stack engineer (React, TypeScript, .NET, PHP) and the operator of a WooCommerce store doing 2,000+ orders a month. The bot that places its supplier orders, the sub-0.5s add-to-cart, the servers it runs on — I built all of it, on my own money. I do the same for clients: WooCommerce performance, workflow automation & browser bots, and payments — worldwide, remote-first.
● Las Palmas · Remote-first
Fixed-price rescues
Three productized services with a clear scope, a fixed price, and a paid diagnosis up front — so you never sign an open-ended hourly meter. Each starts with a low-risk diagnosis that's credited toward the fix.
Stop paying people to copy-paste between websites. I build unattended bots that do the repetitive logins, form-filling, data entry and order processing 24/7 — with alerts when something needs you. My own store runs on one: it has placed every supplier order (25–50/day) without a human touching it.
Your AI- or "vibe-coded" WooCommerce/Shopify store throwing 500s, broken checkout, or security holes in production? I fix what the AI broke.
A slow store bleeding rankings and conversions? Green LCP and INP — the exact playbook that cut add-to-cart from ~2.5s to under 0.5s on my own 150K-visit/month store.
Failed or declined payments, broken Stripe subscriptions, 3DS/SCA errors and webhooks that never mark orders paid — diagnosed and fixed. Also Redsys/Bizum for European gateways.
Services
Senior engineering where it pays off: fast WooCommerce stores, working Spanish-bank checkout (Redsys, Bizum, Stripe), full-stack product builds, automation, booking systems and .NET modernization — design, build, deploy, and keep it running.
I make slow WooCommerce and WordPress stores fast — green LCP and INP, faster admin, lower hosting cost. The exact playbook behind a store doing 150K visits a month.
Failed and declined payments, broken Stripe subscriptions, 3-D Secure / SCA errors, refunds and webhooks that never mark orders paid — fixed fast. Also Redsys and Bizum for European gateways, which most developers cannot touch.
End-to-end web apps that go from idea to revenue. I own the whole stack — UI, API, data, infra — in React, TypeScript, Node and .NET, so there are no handoff gaps.
The boring work that quietly saves hours every day — order pipelines, invoicing, stock sync, supplier feeds and headless-browser bots — wired together and left to run.
Direct-booking websites and reservation engines that take payments and skip the 15% OTA commission — availability calendars, iCal/channel sync and guest portals. The engine behind Kanarix.
Modernising serious business software. ERP systems, CQRS / MediatR refactors, and typed React front-ends that a team can keep building on.
Selected work
No mockups or made-up case studies. These are products and platforms I actually built and run — with the metrics and stack that back them up.
Co-founder & engineer · 2023 — present
My own store — and my loudest case study. Real customers, real money, every day.
I co-founded and run the engineering behind a high-traffic Polish toy store: 2,027 orders in December 2025, typically 25–50 orders a day. The supplier offers no API, so I built a bot that drives their website directly and places every production order unattended — zero manual fulfillment, with a Firebase-backed admin panel and alerts when something needs a human. I migrated the store off shared hosting to a Hetzner CX53 VPS (OpenLiteSpeed, Redis, OPcache) and wrote the custom mu-plugins that cut add-to-cart from ~2.5s to under 0.5s, plus the cron jobs behind stock sync, supplier feeds and email workflows. Paid acquisition runs at 9+ ROAS on Facebook.
Founder · 2025 — present
My freelance & contract practice.
End-to-end web apps for clients in React/TypeScript, .NET and WordPress, plus the automation and infrastructure to run them. API integrations, n8n and webhook pipelines, and Hetzner cloud infra (OpenLiteSpeed, Redis, OPcache, backups) wired up with CI/CD and Docker.
Founder · In progress
Battle-tested store tooling, productized.
I am turning the WooCommerce performance tooling I built for my own store into commercial plugins. ShopTune focuses on backend performance; OrderHQ is an orders workspace (coming soon). Real tools, proven on real traffic before they ship.
Founder · 2025 — present
A comprehensive solution for the vacation rental business.
An all-in-one platform for vacation rental businesses — bringing bookings, guest management, channel sync and operations together in one place, built on the same stack and infrastructure I run for my own projects.
Full-stack engineer · 2019 — 2025
Serious business software, modernised.
Years of building and modernising ERP systems on ASP.NET MVC. I refactored backends toward CQRS/MediatR and led the React Query / Zodios / TypeScript front-end modernisation — building reusable file managers, form creators and recursive CRUD components on DevExtreme. Earlier, I wrote CI/CD-integrated end-to-end test suites in Selenide (Java) for secure banking systems.
Tech stack
Chosen for shipping and longevity, not novelty. I run all of this in production today.
About
I am a store owner who codes. I co-run a WooCommerce store doing 2,000+ orders and six figures of monthly traffic, which means I do not get to hide behind a clean staging environment — the code I write runs against real customers, real money and real ad spend every day. When your checkout breaks or your fulfillment eats hours, I know exactly how that feels, because it is my problem too.
That pressure shapes how I work. I care about systems that stay fast, infrastructure that stays cheap, and automation that quietly removes work instead of adding it. When something I build for my own store proves itself, I productize it — that is how WooPlugs started.
Before going independent I spent years on enterprise React and .NET — modernising ERP systems toward CQRS, building typed front-ends, and writing automated test suites for secure banking software. I write code that is meant to be maintained, not just demoed.
Marc Stan is the working name of Marcin Stańczyk — senior full-stack engineer, based in Las Palmas de Gran Canaria.
Let's build
I take on a small number of remote contracts and freelance engagements at a time. Tell me what you're building — I'll reply with honest thoughts on how I'd approach it.
Available for remote contracts & freelance · Las Palmas de Gran Canaria, Spain