Currently accepting select freelance projects
Jan
Kessler
Portrait of Jan Kessler Jan, hi :)

Currently Software Engineer & Lead Dev @ Ah&Oh

Background Active in software engineering since 2018 with a focus on sustainable architecture. I specialize in designing and implementing robust solutions using TypeScript, Kotlin, and Swift.

Available for freelance
Selected work

Projects I've shipped to production

Not concepts, not prototypes — applications relied on daily by real customers.

  • № 01

    teamatic

    Ah&Oh GmbH

    teamatic is a workforce management platform that lets organizations digitally handle staff rosters, working hours, holidays, personnel files and employee evaluations – including on-site time tracking via an NFC terminal. I was responsible for the architecture and development of the entire application, from the backend and web app to the mobile apps and the NFC terminal.

  • № 02

    besttrick

    Ah&Oh GmbH

    BESTTRICK is a global online skateboarding platform where skaters from all over the world can join trick competitions, upload their videos, get scored by professional judges and the community and collect points for a worldwide ranking. I was responsible for the architecture and development of the entire application, from the platform and backend to the mobile app for iOS and Android.

  • № 03

    setHUB is a platform that lets companies create, manage and publish their own multilingual websites and web apps – including content, media, translations and AI-powered features. I was responsible for the architecture and development of the entire application, from the backend to the admin dashboard.


  • № 04

    einfach-bewerben

    einfach-bewerben GmbH

    einfach-bewerben.de is an online platform that lets companies publish job openings, receive applications through a simple chat-based dialogue and manage the entire hiring process digitally as a team. I was responsible for the architecture and development of the entire application, from the backend to the applicant and admin areas.