Retail Next
A modular SaaS platform for retail. Inventory, online leads and the sales team in one place, with an isolated instance for every client.
- Vehicle inventory
- Online leads
- Multi-instance
- Lead triage
I’m David Marek and I build
that sales teams actually use.
In practice for
Porsche Centrum PrahaRetail Next
- 3+
- years at Porsche Centrum Praha
- 5
- concurrent roles, from CRM to development
- 7
- projects in production
- 16
- tools and skills in daily use
Built in practice, not on paper
Porsche Stock
Stock vehicles for Prague, Brno, Ostrava and Plzeň. Excel sync, an audit trail of mechanics’ inspections, VIN matching and push notifications.
Next.js, Supabase RLS, PWACRM Sales Dashboard
Sales reporting on top of SAP C@P. A Playwright scraper on a VPS pulls the data and Power BI turns it into overviews for management.
Power BI, Python, PlaywrightMeta Ads in Power BI
A pipeline from the Meta Marketing API straight into Power BI. Campaign performance next to sales data in one report.
Marketing API, Power Query MGA4 funnel for the enquiry form
Tracking the journey from first visit to submitted enquiry, connected to Power BI with access by branch.
GA4, Power BI RLSWhat I know and where I’ve used it
Every connection is a real project. Pick a project or a point in the graph to see what it connects.
Pick a project or a point in the graph
Solid dots are projects, rings are skills. The lines show which skill I used in which project.
Pick a project
Services for what you’re working on
From a one-off data audit to long-term collaboration. Take one part or the whole chain.
Data analytics & Power BI
ETL in Power Query, data models in DAX, dashboards with access control across branches, and custom visuals in HTML, CSS and JS.
Web app development
Next.js, React and Supabase. Multi-tenant architecture, roles and permissions, deployment on Vercel.
CRM implementation
Rollout, sales team training, KPI reporting and clean lead data.
Automation & integrations
Playwright scrapers, webhooks, Meta Lead Ads and the Marketing API. Data flows where you need it, with no manual retyping.
How a project runs
- Data audit Where your data comes from, where it gets lost and what you can’t see in it today.
- Design KPIs, a data model and a prototype for sign-off.
- Build A dashboard, app or integration in short iterations.
- Launch Team training and handover, so it keeps working without me.
- Measure We track the impact in numbers and fine-tune it in daily use.
Business, data and code in one head
I taught myself the technical skills on real problems with real impact. I speak both sales and database.
Porsche Centrum Praha
I started as a Connect Specialist, working on CRM processes and communication with Porsche AG. Over time that one role grew into several: CRM rollout and training, KPI reporting, Power BI dashboards, internal app development and leading the Porsche Hosts and reception team.
Retail Next s.r.o.
Co-founder. Architecture and development of the SaaS platform, the business model and preparing to take it beyond automotive.
AMBIS University
International Marketing and Management, part-time study. Thesis on digitalising the customer journey.
Tell me what you’re working on.
I’ll show you on your own data. Happy to help with a one-off project or a long-term collaboration.
David Marek
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I’ll get back to you within two working days. If it’s urgent, email me at the address on the left.