You run a shop
Your JTL or Shopware shop is losing money to problems no one has solved for weeks. Your agency is too slow, too expensive, or sends juniors. You don't need another vendor – you need the developer the vendors call when they're stuck.
New projects from 08/2026
Pascal Kleefeld – Senior E-Commerce developer for when standard help isn't enough.
JTL, Shopware, interfaces, ERP. For shop owners who want a developer who delivers and thinks along – and for agencies in white label, when a project needs seniority.
Response within 24 hours
400+ Projekte. 150+ Mandate.
20 years of experience – 400+ Projects
Two paths, one developer
Who I work for
You run an agency
You've won the project – but the seniority isn't in-house right now. I dock in under white label: invisible, under NDA, in your branding. Your clients never know I exist. You deliver, I stay in the background.
You have your own dev team
Your developers are good but overloaded – or you're missing the one person with architectural vision and e-commerce depth. I dock in as a senior: code reviews, architecture, core features. No junior, no full-time hire, no micromanagement.
Leistungen
When projects need more seniority
I'm not the freelancer for "ticket processing". I bring calm, architect-level technical understanding, and independent progress to your most complex projects.
Technical Depth
I understand the "why" behind the code. Clean interfaces and scalable ERP integrations are my daily bread.
Operational Calm
Even when deadlines are tight: I work structured, communicate proactively, and find solutions instead of excuses.
Independence
No micromanagement needed. After onboarding, I take responsibility and deliver measurable results.
The moments when normal help fails
The shop is bleeding revenue
A checkout bug, a WaWi sync that dies at night, load times that scare buyers away. Everyone searches, no one finds it. I find the cause – and fix it.
Stalled Projects
A complex relaunch stuck? I analyze the status quo and get the project back on track.
Team or agency at capacity
Your devs or your agency can't keep up? I dock in as senior reinforcement and take over the core features.
Complex Interfaces
JTL-Wawi, Shopware or ERP integration causing headaches? I build the stable bridge between them.
Send me a ticket that's been stuck for weeks. I'll solve it – or tell you honestly why it can't be done.
Pascal Kleefeld
Competency Spectrum
Full-stack seniority with focus on e-commerce infrastructure.
FRONTENDBACKENDPLUGINSAPIAI
JTL-Shop & Shopware
- Theme & Template Development
- Plugin Architecture
- JTL-Wawi Integration
- Error Analysis & Project Stabilization
- API & Integration Logic
AI
- LLM Apps & Agents · Claude/OpenAI/Gemini
- AI Content · Text/Image/Video
- AI in Shop · Service/Personalization
- Prompt Engineering & RAG
- Integration into JTL/Shopware
Technical Lead
- Code Reviews
- Tech Stack Consulting
- Architecture Design
- Documentation
- Onboarding & Project Management
Interfaces & ERP
- Middleware Solutions
- REST & GraphQL APIs
- Data Mapping
- Performance Optimization
- Process Logic
For agencies: White label
Your customers remain your customers
I work in the background. No direct contact. No self-promotion. No visible external brand.
Email in your branding
Client meetings as "your dev"
Direct Slack/Teams connect
Strict NDA / Confidentiality
Referenzen
Eine Auswahl aus Vierhundert
E-Commerce · Gebrauchte Elektronik · Re-Commerce (vormals KAR-Media)· 2018-2021
Paradebeispiel für Werksschwund
„Cleverbuy: ein neuer, seriöser Markenauftritt und dahinter ein Haus, das sich selbst zerlegte."
Fall lesen →Werksschwund
Handwerk · Werkzeug & Arbeitsschutz · E-Commerce· 2024-2025
Aus Sortiment wird Branchen-Player
„Endlich Identität: ein branchenweit unvergleichbarer Werkzeug-Shop in Rough-Optik, mit Witz und Würde."
Fall lesen →Werk vollendet
E-Commerce · Gebrauchte Elektronik · Re-Commerce· 2024-2026
Und der Alltag macht wieder Spaß
„Aus erfolgreichem, aber wildem Brüder-Startup wird prozessoptimierter, reifer Re-Commerce-Seller mit Vernunft."
Fall lesen →Werk vollendet
Öfen & Kamine · E-Commerce · Wohnen· 2018-2019
Aus Erbe wird Identität
„Ein Ofenshop, der endlich nach Feuer aussieht statt nach Preistabelle."
Fall lesen →Werk vollendet
Sportnahrung & Fitness · E-Commerce · JTL-Shop (Eigenprojekt)· 2016-2018
Eine starke Marke alleine verkauft nicht
„Mein eigener, Award-nominierter Shop, zweimal von der Vorzimmer-Erosion erlegt. Der Fall, aus dem Kronolith wurde."
Fall lesen →Werksschwund
Handwerk · Steinteppich · Dichtstoff· 2025
Aus Nachname wird Marke
„Aus einem Namen wird eine Marke"
Fall lesen →Werk vollendet
Auswahl früherer Mandanten
15+
Years in e-commerce
JTL-Shop4
Co-developer
Eigener Shop & Ladenlokal
Built – Sold
Experience from development, agency, and commerce
I know e-commerce not just from code, but also from agency life, client projects, and operational commerce.
5 years own advertising agency
Leadership responsibility and direct client contact on major projects for web and print media.
JTL Core Development
Formative contribution to the standard of one of Germany's most important e-commerce solutions.
10+ years service partner
Direct contact with owners of relevant online shops in the DACH region.
Contact