Hi, my name is

Sebastian Ziemianski.

I'm a |

Sebastian Ziemianski
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About Me

About Me

Hello,

I'm a dedicated student and founder with over 4 years of hands-on experience in software development and building real products. I focus on backend systems, clean architecture, and bringing ideas from concept to deployment.

I'm an Informatics student at Fontys Venlo (2024–2028), specializing in Data Science & AI. I previously studied Computer Science at RWTH Aachen (2022–2024) and switched to a more practical, project-based university to deepen my applied engineering skills.

My work centers on backend systems, databases, and scalable architectures. I have an entrepreneurial mindset and enjoy building real products while studying.

Sincerely, Sebastian

Education

My Education

2024 – 2028 (expected)

Fontys University of Applied Sciences

Informatics

Fontys University of Applied Sciences

Eindhoven, Netherlands

Bachelor programme with focus on Data Science & AI: applied machine learning, database systems, software engineering, agile delivery, and practical system design across real-world projects.

Data Science & AIMachine learningDatabasesSoftware engineeringAgile

2022 – 2024

RWTH Aachen University

Computer Science

RWTH Aachen University

Aachen, Germany

Foundation in algorithms & data structures, mathematics, and core computer science before transferring. Built strong theoretical grounding for systems and software work.

AlgorithmsData structuresMathematicsSystems

Aug 2014 – Jun 2022

Abitur

Maria-Sybilla-Merian-Gymnasium

Germany

University entrance qualification (Abitur) with grade 2.0. Certificate for outstanding achievements in Computer Science.

Experience

My Experience

carsite24

Founder & Software Developer

Current

carsite24 · Since January 2026

IT solutions for automotive dealerships: custom websites, management systems, SEO optimization, and system integrations.

Currently building a proprietary dealership management system:

  • Vehicle data aggregation (DMS like cargate360 integration)
  • API-based vehicle imports
  • Automated publishing to Mobile.de, AutoScout24 & dealership websites
  • Centralized inventory management
  • PostgreSQL as single source of truth
  • Automated sync via cron/webhooks
Next.jsReactTypeScriptNode.jsPostgreSQLPrismaAPI integrations
GS Automobile Rheinland

Automotive Operations & IT Support Assistant

GS Automobile Rheinland · 2023 – Present

  • Managed vehicle listings & digital systems
  • IT support & troubleshooting
  • Vehicle documentation verification
  • Automotive photography & online publishing
IPE Immobilienprojektentwicklung

Working Student IT Support and Web Management

IPE Immobilienprojektentwicklung · 2024 – 2025

  • Website management (CMS / WordPress)
  • On-site IT support
  • Technical troubleshooting

Projects

My Projects

Startseite gsauto.de – Ihr Auto wartet auf Sie, Fahrzeugsuche

gsauto.de

Automotive Dealership Website

  • Dynamic vehicle inventory
  • Structured data for SEO (JSON-LD)
  • Dynamic sitemap (one URL per vehicle)
  • DMS integration (cargate360)
  • Lead forms & clean vehicle filtering

Technologies used

React / Next.jsTypeScriptTailwind CSSNode.jsAPI routesPostgreSQL

University ERP System

Full-Stack Information System — Fontys Project

  • PostgreSQL database
  • Layered architecture
  • REST API
  • Svelte frontend
  • Test-driven development
  • Agile sprint structure

Technologies used

SveltePostgreSQLREST APILayered Architecture

Technology Excellence

My Tech Stack

Technologies I use to ship fast, modern, and scalable digital products.

  • Modern web frameworks
  • Cloud-ready infrastructure
  • API-driven architecture
  • Scalable backend systems
More about my experience

Move the pointer over the sphere to steer the orbit.

Contact

Contact Me

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