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Jakub KaczmarekJK

Jakub Kaczmarek

E-commerce Automation & API Integration Expert

€450/day
Gdansk, PL
15+ years
API Integration
C#
PHP
Next.js
Tailwind CSS

Average response time: 1 hour

About Jakub

I help e-commerce companies automate operations and integrate systems to reduce manual work, errors and delays. With 15+ years of IT experience, I design and implement reliable workflows for orders, shipping, statuses, labels, and data exchange. I work hands-on with API integrations (REST/JSON), C#/.NET, SQL/BigQuery, and e-commerce tools like BaseLinker to deliver scalable, practical solutions.
Digital and IT Services

  • English

    Native or bilingual

  • German

    Basic

  • Polish

    Fluent

Remote only
Primarily works remotely

Experience

  • Self-employed
    Full-Stack Web Developer (Next.js / PHP)
    January 2023 - Today (3 years and 7 months)
    Designed and developed a web-based 3D product configurator with AI-generated visualizations.
    Built an interactive UI for parameter-based customization and real-time preview generation.
    Implemented backend logic for data handling, project export, and integration-ready architecture.
    Delivered a user-friendly workflow that reduced manual design iterations and improved client communication.
    Next.js PHP tailwind.css JavaScript API
  • Kaczmarek.Studio
    E-commerce Automation & API Integration Consultant
    DIGITAL AND IT
    January 2021 - May 2026 (5 years and 5 months)
    Gdansk, Poland
    I design and implement e-commerce and logistics automations to reduce manual operations and errors.
    I build API integrations (REST/JSON) between sales, shipping and back-office systems, including order/status synchronization and label workflows.
    I create reliable data flows (import/export, mapping, validation, retry/polling) and operational reporting (SQL/BigQuery/Excel).
    Typical stack: BaseLinker, C#/.NET, SQL (including Firebird), BigQuery, WooCommerce, JavaScript/HTML.

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