Lorzen.de · Kai Lorenzen · northern Germany, working remotely

Custom development & eCommerce support

Web apps, dashboards and integrations built around your workflows – plus support and consulting for Bagisto, Shopify and plentyOne. Practical, honest and backed by more than 15 years of eCommerce experience.

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Services

My main focus is custom development – web apps and tools for everyday commerce. On top of that: support and consulting for Bagisto and Shopify, and 16 years of hands-on plentyOne experience (2009–2025).

Main focus Custom development When the right tool doesn’t exist, I build it: web apps, dashboards and integrations for your workflows – for example Preisradar and Marktschreier. More about custom development →
Support & consulting

Bagisto

Support, consulting and custom development for Laravel-based Bagisto stores – including my own extensions.

More about Bagisto → Support & consulting

Shopify

Help with setup, apps, themes, marketplaces and inventory tools – and with moving from plentyOne to Shopify.

More about Shopify → Experience 2009–2025

plentyOne

Consulting and support from both the merchant and agency side: items, orders, integrations and workflows.

More about plentyOne →
Custom developmentWeb apps, dashboards and integrations – tailored to your workflows.
Custom development · web apps & tools

Custom development

When the right tool doesn’t exist, I build it: web apps, dashboards and integrations that fit your workflows exactly.

Many merchants hold their processes together with spreadsheets, plugins and manual work. Instead, I build lean tools that bring together data from your store, ERP and marketplaces – with a clear interface, your own hosting and AI integration if you want it.

Preisradar

Price comparison for a Shopware store: own items against competitor prices, rule-based analysis, Google visibility and a daily summary.

Marktschreier

Merchant cockpit for Shopify, Amazon, eBay and TikTok Shop: listings, stock, ad campaigns and opportunities at a glance.

Bagisto MCP Connector

Store management via an AI assistant – with approvals instead of flying blind.

Platforms & club apps

Kampfgericht-Planer and SchleiShare: from first draft to day-to-day operation.

Discuss your idea See examples
BagistoSupport, consulting, extensions and custom development for Laravel commerce.
Bagisto · Laravel

Bagisto support & consulting

For stores that need more than standard functionality – and for anyone whose Bagisto store is not working the way it should.

Bagisto is built on Laravel and designed to be extended. That makes it a strong choice for businesses with custom processes, specialised product logic or the wish to self-host instead of depending on a closed SaaS platform.

I work with Bagisto 2.x every day, develop my own packages and run my own test and extension store. You get experience from real installations, not theory.

Support & troubleshooting

Help with installation, errors, performance, hosting and technical Bagisto questions.

Updates & upgrades

Safe updates within Bagisto 2.x, including checks of custom packages and modifications.

Extensions

Custom functionality for products, variants, uploads, admin areas and specialised shop workflows.

Consulting

Architecture, data model, hosting and roadmap: I help you set up Bagisto the right way.

Integrations

Connections to ERP systems, marketplaces and external services as clean, maintainable packages.

AI store management

The Bagisto MCP Connector lets you manage a store through an AI assistant – controlled, with approvals.

Request Bagisto support My extensions Extension directory
ShopifySupport and consulting for merchants who want to sell faster, cleaner and with less manual work.
Shopify · Marketplaces

Shopify support & consulting

Shopify is quick to set up. It only runs smoothly once apps, inventory, marketplaces and workflows fit together.

Many merchants sell in their own Shopify store, on Amazon, eBay or TikTok Shop at the same time – and still maintain listings and stock levels by hand. That is where I help: solving problems, structuring workflows and removing unnecessary manual work.

Support & quick help

Settings, apps, theme adjustments, payment and shipping questions, or when something simply does not work.

Store review & consulting

I review your store and tell you honestly where the friction is and what is actually worth doing.

Marketplaces & inventory

Connecting Amazon, eBay, TikTok Shop and tools such as Billbee – with a focus on accurate stock and fewer oversells.

Automation & AI

Automate reports, recurring tasks and analyses so more time is left for selling.

Moving from plentyOne to Shopify

Transfer items, variants, customers and workflows cleanly – and clarify beforehand what will work differently day to day.

Onboarding

I show you and your team how to maintain the store yourselves afterwards.

Request Shopify support
plentyOneConsulting and support based on 16 years of practice – as a merchant and on the agency side.
plentyOne · 2009–2025

plentyOne consulting & support

When plentyOne runs, but not smoothly, it costs time every single day.

From 2009 to 2025 I worked with plentymarkets, now plentyOne – as a merchant and from 2015 on the agency side as well. I know the system’s strengths and quirks. I help when something is stuck, and I am honest when a leaner system such as Shopify might suit you better.

Items & variants

Structure items, variants, attributes, properties and images properly.

Orders & workflows

Simplify order processing and recurring tasks.

Integrations

Set up and troubleshoot marketplaces, shipping providers and shop connections.

Switching to Shopify

Check whether Shopify is enough – and guide the move if it fits.

Request plentyOne support

Shopify or Bagisto?

Both platforms are good – for different requirements. I give you honest advice, even if the answer is “stay where you are”.

Shopify fits if …

  • you want to sell quickly without running your own server
  • standard processes and the app ecosystem cover your needs
  • hosting, security and updates should not be your concern
  • monthly platform and app costs are acceptable for you

Bagisto fits if …

  • you want full control over code, data and hosting
  • custom processes or special product logic need to be modelled
  • you need custom integrations or your own admin features
  • you prefer to avoid the licence and revenue fees of a SaaS platform

From plentyOne to Shopify

Many merchants only use part of plentyOne. Together we check whether Shopify – with Billbee if needed – covers your workflows, and plan the move step by step.

AI in daily commerce

Product texts, analyses, customer communication and store management via AI assistants – implemented practically, without hype or jargon.

References

A selection of shops, platforms and websites I have worked on – and what I did for each of them.

Screenshot of Preisradar with sample data Own development · web appPreisradarPrice monitoring for a Shopware store: own items against hand-picked competitors, AI-assisted extraction, rule-based analysis, Search Console and Merchant Center, SEO checks, eBay, an opportunity finder and Claude access via MCP. Screenshot with sample data. Screenshot of the Marktschreier demo with sample data Own development · merchant cockpitMarktschreierCockpit for merchants on Shopify, Amazon, eBay and TikTok Shop: listings, stock, Buy Box, ad campaigns and an opportunity finder in plain language. The link opens the demo with sample data. Screenshot of kampfgericht-planer.de Own development · club platformkampfgericht-planer.deClub platform for handball: fixtures, scorer-table and referee scheduling, halls and in-hall TV – designed and built by me. Screenshot of schleishare.de Own project · platformschleishare.deRegional platform for the Schlei area: save and share food, discover lunch offers and browse local flyers. Screenshot of shop.lorzen.link Bagisto · own projectshop.lorzen.linkMy plugin store for Bagisto 2.4: self-developed extensions, shop build and operation – including the Bagisto MCP Connector for AI-assisted store management. Screenshot of dagos.shop Migration plentyOne → Shopifydagos.shopMigration of the store from plentyOne to Shopify, with Billbee for inventory and order management. The new store launches soon. Screenshot of gartenpaul.de plentyOne · consulting & supportgartenpaul.dePruning shears, forestry and barbecue gear: consulting and ongoing support for the plentyOne store. Screenshot of jack-shop.de plentyOne · consulting & supportjack-shop.deHome textiles: consulting and ongoing support for the plentyOne store. Screenshot of lagento.com plentyOne · consulting & supportlagento.comWide range from home & garden to pet supplies: consulting and ongoing support for the plentyOne store. Screenshot of angeln.lorzen.de Own project · browser gameangeln.lorzen.de“Princes of the Schlei”: real-time strategy browser game with settlement building, fishing and trade in Angeln around 1600. Screenshot of hsgangeln.de WordPress · club websitehsgangeln.deOngoing support and development of the HSG Angeln handball club website. Screenshot of internisten-schleswig.de WordPress · design & buildinternisten-schleswig.deDesign and build of the website for the NorDiaMed internal medicine practice in Schleswig. Screenshot of landjugend-sh.de WordPress · technical setuplandjugend-sh.deTechnical setup of the website for the Schleswig-Holstein rural youth association. Screenshot of nordlan.de Website · rebuildnordlan.deRebuild of the website for the NORDLAN retro LAN party, including registration and participant list. Screenshot of bau-thomsen.de Website · admin areabau-thomsen.deWebsite for ST Bau with a protected admin area for uploading and sorting images.

Screenshots taken in November 2026.

About me

I’m Kai Lorenzen. I work where technology has to solve real day-to-day problems instead of merely looking impressive.

I’m not a designer who sells you a polished interface and disappears afterwards. My strength is making technology work in everyday commerce: building custom tools and web apps, extending and supporting Bagisto, structuring Shopify workflows, connecting marketplaces, understanding plentyOne and applying AI where it genuinely helps.

From 2009 to 2025 I worked with plentymarkets, now plentyOne – as a merchant and from 2015 on the agency side as well. That gives me both perspectives: the technical implementation and the practical question of what actually helps in daily business.

I also maintain a strong professional network. If a problem requires expertise outside my own scope, I can usually bring in someone who is a better fit for that specific task. This means you get access not only to my experience, but also to a broader network of specialists.

Outside work I am active in local sports, including HSG Angeln, and live with my family in Süderbrarup in northern Germany. I work locally as well as remotely with businesses throughout Germany and beyond.

Kai Lorenzen
“The best way to predict the future is to create it.”Peter F. Drucker

Contact

Do you have an idea for a custom tool, is your Bagisto, Shopify or plentyOne store causing trouble, or do you want to know which platform suits you?

Send me a short description of what you need. I will tell you whether I am the right person for it, and if I am not, I can often point you towards someone who is.

kai@lorzen.de