Senior Product Manager
Fabian Seibt
AI-native Product Builder · GenAI & Platform Products
Senior Product Manager and hands-on product builder at the intersection of digital products, platforms and applied AI. At congstar (Telekom Group), I run AI-native product development cycles: ideas are designed, prototyped and A/B-tested within the team, and validated experiments go straight into production code. From mid-2025 to mid-2026, I increased overall conversion by 30%. With Claude Code and GitHub Copilot, I build and ship myself — from prototype to production feature — and explore new GenAI use cases in my own product lab, Loggify.
Experience
Senior Product Manager
congstar·Nov 2022 – Present
- Build and scale digital products in the Fixed Broadband domain (Telekom Group), focusing on the broadband order & checkout platforms on congstar.de
- Increased overall conversion rate by 30% from mid-2025 to mid-2026, with individual experiments lifting conversion by single-digit percentages and up to 10–20%
- Introduced a new product development lifecycle with clear ownership: ideas are designed, prototyped and tested within the team before engineering handover, so validated experiments go straight into production code — enabling fast, experiment-driven iteration in a corporate setup
- Drive AI-native product workflows, embedding GenAI into discovery, prioritization, delivery and operations, alongside Low-/No-Code enablement and cross-team product strategy
Founder & Product Builder
Loggify·Mar 2022 – Present
- Founded as a SaaS startup in early 2022 to learn first-hand how to build a company; since evolved into a personal lab for product development and applied AI
- Freelanced for a Cologne-based startup, shipping features in their new native app hands-on as a developer using GenAI-assisted development
- Built and launched side projects, including the digital presence of a local alpaca farm (alpakahof-selbst.de)
Head of Product & Tech
getpacked·Oct 2020 – Mar 2022
- Built an ordering platform for local food retail, similar to Lieferando, enabling food artisans to run their own online shops for pre-orders and delivery
- Owned the product vision end-to-end, aligned with business and customer goals, and evolved the product from a gastronomy solution into a platform for food artisans
- Led a team of four developers while contributing hands-on; built the core product on a modern web stack
- Drove product development from discovery to delivery as the central interface between business, product and technology
Product Owner
Honestly·Jul 2019 – Oct 2020
- First and sole product manager in the team, building software for large corporate clients
- Shifted the team from sales-driven ad-hoc requests to a structured, vision-driven roadmap and introduced agile processes
- Owned product vision, roadmap and backlog in close collaboration with the founders and a 6-person engineering team
- Led feature discovery, validation and delivery
Education
University of Cologne
Bachelor of Science · Economics, minor in Business Administration
Skills
AI-native Product Development
AI Tools & Engineering
Product
Build & Tech
Leadership
Languages
Get in touch
Whether you have a question, a project idea, or just want to say hello — feel free to reach out.