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Sebastian Gepperth

@rash

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Product designer and web application engineer blending UX, frontend engineering, and product leadership.

Germany

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What I'm looking for

I seek senior product or engineering roles where I can lead product design and frontend engineering, mentor teams, iterate rapidly, and ship user-centered, scalable web applications.

I am a product designer and web application engineer with two decades of experience building intuitive, production-ready web products. I combine strong visual craft with hands-on frontend engineering to iterate quickly from prototype to customer-ready releases.

As Head of Product I led a major redesign and shipped a new product version that blends deterministic text generation with generative AI, delivering the first production customer in six months while maintaining close collaboration with customer solutions. I co-founded a software agency, contributed to open source SaaS, and have a track record of improving onboarding and usability across platforms.

I thrive at the edge of possibilities, mentor and foster inclusive communities, and enjoy rapid prototyping, transparent communication, and practical engineering—always focused on helping customers and users get where they need to be.

Experience

Work history, roles, and key accomplishments

Current

Freelance Designer & Frontend

Current

rash.codes

Apr 2021 - Present (4 years 9 months)

Built and continuously improved venueless, an open-source virtual conference platform and SaaS offering, delivering frontend features and design iterations to meet community and customer needs during the pandemic.

Frontend Development UX Design Vue JavaScript Open Source SaaS Prototyping

Current

Head of Product

Current

AX Semantics GmbH

Aug 2016 - Present (9 years 5 months)

Led product redesign and development of a new content-creation platform combining deterministic text generation and generative AI; shipped from prototype to first production customer in six months and improved usability and feature set for scale.

Product Design UX Frontend Engineering Javascript Typescript Prototyping Generative AI Product Strategy Agile

Web Application Engineer

Onventis GmbH

Feb 2016 - Jul 2016 (5 months)

Implemented and shipped a redesign of the catalog management component for Onventis' procurement platform, delivering frontend improvements during a short-term engagement.

Frontend Development JavaScript CSS UX WebSockets Reactivity Component Design

Co-Founder

Creatale GmbH

Jan 2013 - Jan 2016 (3 years)

Co-founded a software agency building custom applications (notably in the medical field) and internal game prototypes, leading client projects and product development from 2013–2016.

entrepreneurship Java .NET Product Development Team Leadership

Education

Degrees, certifications, and relevant coursework

Universität Stuttgart

Softwaretechnik, Software Engineering

2007 - 2013

Studied Software Engineering with a focus on practical application in cross-departmental projects; left shortly before completing a thesis to start a company.