Senior hands on every ticket
An agency staffs your project with a team and bills the whole stack. Here a certified senior does the work directly, so you pay for engineering, not for coordination.
Senior Magento 2 developer · Adobe Commerce Expert certified · 20 years in e-commerce
Agency-level Magento delivery.
One accountable senior.
I build, migrate, integrate and support Magento 2 stores, with Hyvä or a headless PWA Studio / Venia storefront, for mid-market merchants. You talk directly to the person who writes the code. No project managers, no juniors, no hand-offs, and a fixed price for every phase.
Adobe Certified Expert since 2020- Toptal network since 2019
- Hyvä & headless Venia
- ERP / PIM integrations
Why merchants move their Magento work to me
Most Magento budgets do not go into code. They go into coordination: account managers, project managers, hand-offs between developers, and fixing junior work. I remove that layer.
Fixed price, not open-ended hours
Every project is scoped, quoted and delivered for a fixed price per phase. Support runs on a flat monthly retainer. No surprise invoices at the end of the month.
Faster, by design
Two decades of Magento internals plus modern, AI-assisted tooling for the routine parts. I know where time goes in Magento projects and how to avoid it.
| Typical agency project | Working with me | |
|---|---|---|
| Who writes your code | A mixed team, often juniors | A certified senior, every line |
| Communication | Account manager, then PM, then developer | Direct, usually same day |
| Pricing | Hourly, for six to ten people | Fixed price per phase or flat retainer |
| Technical decisions | Days, via meetings | Hours, in writing |
| Continuity | Team rotation | Same person, with a named backup for cover |
| After go-live | Handed over to a support desk | Same developer, on a long-term retainer |
Services
Clear scope, fixed price. Starting prices below; the exact quote follows a short audit.
Ongoing
Support & maintenance retainer
Ongoing care for a live store: security patches, bug fixes, small features, extension updates, performance monitoring and emergency response. Defined response times, flat monthly fee.
from €1,900 / month
Ask about a retainer →Project
Hyvä migration
Replace Luma with Hyvä: faster pages, better Core Web Vitals, cheaper future development. Theme build, extension compatibility, checkout, QA and go-live.
from €9,000
How the migration works → Get a migration quote →Project
Magento 2 upgrade & performance
Upgrade to the current 2.4.x and PHP version, fix what breaks, tune the stack: Redis, Varnish, OpenSearch, indexers, cron. Measured before and after.
from €3,500
What the upgrade includes → Plan an upgrade →Project
ERP, PIM & marketplace integrations
Two-way sync of products, prices, stock, customers and orders with your ERP, PIM or marketplace tooling. Built on queues and APIs, with monitoring, so it keeps working after go-live.
from €6,000
Discuss an integration →Takeover
Rescue & takeover
Inherited a store from an agency that left, or a project that stalled? I audit the code and infrastructure, send a written plan with a fixed quote, and take it over.
audit from €1,200
Book an audit →Build
Headless storefront or new store
A headless PWA Studio / Venia storefront on your Magento 2 backend, or a new B2B or B2C store from scratch: architecture, build, integrations, data migration, go-live. I have shipped a Venia-based B2B platform that consolidated several stores into one.
fixed price on quote
Start a conversation →Re-platforming
Magento 1 to Magento 2 migration
Still on Magento 1? I move your catalogue, customers, orders and SEO to a current Magento 2 or Mage-OS install with a Hyvä storefront, rebuild what the old extensions did, and switch over with a tested cut-over plan and a rollback path. I have worked with Magento since the 1.x days, so nothing in the old codebase is a mystery.
from €12,000
Plan the migration →Quick fix
Security patch installation
Adobe publishes security patches for Magento 2 several times a year, and unpatched stores are how card skimmers get in. I apply the current security patches and PHP security updates on staging, run the checks, and release to production in a maintenance window you choose. Fixed price, usually done within two business days.
from €350
Get patched →How it works
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30-minute call
You tell me what the store needs to do. I tell you honestly whether I am the right person for it.
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Audit and fixed quote
For anything bigger than a bug fix I look at the codebase and infrastructure first, then send a written scope with a fixed price per phase.
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Weekly increments
Work ships to a staging environment every week. You see progress, click through it, and change course early if needed.
-
Go-live and support
Launch with a checklist, documentation and a hand-over. Move to a retainer if you want ongoing care.
Here for the long run
Merchants get burned twice: by agencies that rotate the team mid-project, and by freelancers who vanish after go-live. Neither happens here.
I am not going anywhere
I have worked with Magento since 2008, spent five years each with my two longest employers, and still run a web platform I built in 2004. This is a career, not a gig between jobs.
Support for as long as you need it
After go-live you can keep me on a monthly retainer for years, not months: defined response times, the same developer who built the store, and a fair rate agreed up front.
No lock-in, ever
Code, documentation, hosting and accounts stay in your name from day one. If you ever want to move on, the hand-over is a formality, not a negotiation.
Selected work
A few of the problems I have solved. References and details are available on request.
Several stores, one B2B platform
Consolidated multiple Magento stores into a single B2B platform with a headless Venia storefront. Integrated two ERP systems for products, prices, stock and orders, and connected Ergonode PIM and BaseLinker.
Magento at a high-traffic digital marketplace
Five years developing Magento and leading the development team at a large international digital marketplace, with Node.js services, MongoDB, Solr and RabbitMQ around the commerce core.
Architect and tech lead for an e-commerce agency
Five years leading Magento 2 delivery as architect and hands-on technical lead across client projects: integrations, troubleshooting, performance work and mentoring the team.
About
I am Janusz Paśkiewicz, a senior Magento 2 developer and technical lead based in Rzeszów, Poland. I have built e-commerce since 2008 and worked with Magento since its first versions, as a developer, team leader and eCommerce CTO. I hold an MSc in Computer Engineering from Rzeszów University of Technology, earned in 2006, and the Adobe Commerce expert-level certification, earned in 2020. I have been part of the Toptal network since 2019.
I work in CET, which overlaps fully with UK and EU business hours, and I keep evening hours for North American clients, so US East Coast business hours are covered too. For retainers, a vetted senior partner is named in the contract as cover for holidays and emergencies, and your code, documentation and infrastructure always stay in your hands.
Stack
- Magento 2 / Adobe Commerce / Mage-OS
- Magento 1 → 2 migrations
- Hyvä
- PWA Studio / Venia
- PHP 8
- MySQL
- Redis
- Varnish
- OpenSearch
- RabbitMQ
- REST & GraphQL
- Node.js / React
- Docker
- Linux
- CI/CD
Questions merchants ask
Are you really cheaper than an agency?
Usually by a wide margin, because you pay for one senior engineer instead of a team plus overhead. The point is not the lowest price, though. It is getting the work done right, by the person you are actually talking to, at a price agreed up front.
Do you use AI tools?
Yes, as tooling. AI-assisted development makes routine work faster. Every line that ships is reviewed by me, your code stays under NDA, and I use providers whose business terms exclude training on customer data. If your policy restricts AI tooling, we agree that up front.
What happens if you are unavailable?
Retainer contracts name a vetted senior backup developer for holidays and emergencies. For projects, the code, documentation and infrastructure are always yours, never locked to me.
Magento Open Source or Adobe Commerce?
Both, plus Mage-OS. On the front end I work with Hyvä, PWA Studio / Venia and custom headless storefronts.
Hyvä or headless (PWA Studio / Venia)?
For most merchants, Hyvä: it is faster to build, cheaper to maintain and already very fast. Headless on PWA Studio / Venia makes sense when you need a fully decoupled React storefront, several channels on one backend, or an in-house front-end team. I have delivered both, so the recommendation follows your case, not what I prefer to build.
Will you still be around in a few years?
Yes. I have worked with Magento since 2008 and I am building a long-term practice, not filling a gap between jobs. Retainers can run for years, with a named backup developer for cover. And because nothing is locked to me, you are protected either way.
Can you take over a store built by someone else?
Yes, that is a large part of my work. It starts with an audit of the code and infrastructure and a written plan with a fixed quote.
How do contracts and invoicing work?
A simple services agreement with a fixed scope, and an NDA if you need one. I invoice from my Polish company with an EU VAT number: reverse charge for VAT-registered businesses in the EU, no VAT for clients outside the EU. Payment by bank transfer: SEPA in EUR, international wire in USD or GBP. Fixed-price projects are invoiced per phase, retainers monthly. US and Canadian clients get a W-8BEN, so there is no withholding to deal with.
Tell me about your store
Send a few lines about what you need. I reply within one business day with next steps or a straight answer if I am not the right fit.