Sebastian Käufer
Book a fit call

For Shopify, design and performance agencies

Your senior Shopify developer, under your brand.

Theme builds from Figma, complex Liquid and JavaScript, B2B logic, CRO implementation and tracking. Ten years inside Munich agencies, now the extra senior pair of hands on your projects.

Get the partner kit Book a 20-min fit call
AVAILABILITY
Open now
PILOT TICKETS FROM
USD 450
OVERLAP
Full US day, EU afternoon
LANGUAGES
English, German, Spanish

Work that looks like yours

All case studies →
WITH AN AGENCYMigration alongside the client's marketing agency and ITZimply Natural → ARCHITECTURETwo brands from one Git codebase, 523/523 files sharedDual-brand lighting → MEASURED CROMobile add-to-cart 1.95% → 5.08%, reported honestlyNicebeam →

01 — HOW WHITE-LABEL WORKS

01
NDA by defaultYour client, your terms and our partnership stay confidential.
02
No client contactI join client calls only when you invite me, under your name.
03
No branding in codeIP transfers to you on payment.
04
Your toolsYour Slack, your ticket system, your Git repo, a staging theme per ticket.
05
QA before handoverTested on mobile and desktop, with a short walkthrough of what changed.
06
14-day bug warrantyAnything I shipped that breaks, I fix without a new quote.

02 — HOW A TICKET RUNS

  1. 01 · BRIEFYou send the ticket, Figma or Loom. I check the store first, then ask only what is still open.
  2. 02 · SCOPEWritten scope with what is in and out, and one fixed price.
  3. 03 · STAGINGBuilt on a duplicate theme or a branch. You preview before anything goes live.
  4. 04 · GO-LIVEPublished on your go, with the previous theme kept as rollback.
  5. 05 · HANDOVERA changelog your team can forward, written for your client.

03 — WAYS TO WORK TOGETHER

PILOT TICKETTest me on one real task.A small paid ticket from your backlog. You see scoping, communication and handover before anything bigger.FROM USD 450
FIXED-PRICE PROJECTOne scope, one price.Theme build, B2B setup, migration or CRO implementation. Written scope, milestones on staging.FROM USD 2,500
MONTHLY CAPACITYA reserved block, every month.A fixed monthly package for your ongoing tickets, with a weekly summary of what shipped.FROM USD 1,500 / MONTH

04 — BACKGROUND

I know agency work from the inside.

EARLY 2000s3-year dual apprenticeship, Fachinformatiker Anwendungsentwicklung, Munich
~10 YEARSFrontend in Munich agencies, incl. ADAC.de
~6 YEARSFull-time Shopify, 800+ completed projects
NOWSenior partner for brands and agencies worldwide, from Yucatán
First page of the partner kit
PARTNER KIT · PDF · EN / DE Two pages to forward to your team. Services, models, process and three short cases. Download the partner kit (PDF) DEUTSCHE VERSION →