Design Engineer / Product Developer
I design and build digital products across web, creative software and interactive systems.
Designing and building from idea to working product.
06 projects / software, sound and playful systems
/01Beta
A hybrid synthesizer for Windows: three layers of analog, wavetable, sample and granular sound, 1,024 presets, VST3 and standalone.
Designed and built a hybrid synthesizer in C++20 with JUCE 8: sound engine, interface and a 1,024-preset library.
/02Live
A Danish pass-the-device quiz product designed for one shared screen, quick setup and real game-night use.
Designed and built a Danish quiz product with offline-first flow, mobile UX and practical game-night pacing.
/03In development
A creative audio product for turning samples into evolving playable instruments through tactile controls and visual feedback.
Product concept, interface direction and iterative development of a private preview build.
/04Beta
A visual MIDI instrument concept for sketching melodies, basslines and patterns directly into a producer-focused piano roll.
Visual MIDI workflow prototype combining product direction, interface design and plugin development.
/05Live
Your music, as a place. m0vem1nt is a free first-person movement game in the browser: bhop, strafe and surf through 14 tracks or your own songs.
Designed and built a first-person movement game where every song, official or your own, becomes a course.
/06Live
A free grid word game: pick a letter, build words across, down and backwards, and outscore an AI or friends on one screen. No download.
Designed and built a grid word game with solo, AI and same-screen multiplayer modes.
About / Jesaias
Copenhagen, Denmark
Design Engineer
I build digital products from the first idea through the details that make them feel finished. My work moves between web products, interactive systems and creative software.
My background started in visual design and grew into product development. I work hands-on across direction, interface, prototyping, testing and implementation, using modern AI-assisted development tools while keeping product and visual judgement at the center.
Clarify the product, audience, visual direction and first useful version before building too wide.
Move into React, Next.js, TypeScript and Tailwind to make the idea tangible.
Debug flows, interaction timing, edge cases and mobile behavior until the experience feels reliable.
Refine copy, motion, responsiveness and the small product details that make a demo feel credible.
Useful web products shaped around clear interfaces, fast iteration and real use.
Games and interactive tools where the technical idea is part of the experience.
Instruments and workflows that make sound more tactile, playful and immediate.
I use tools such as Codex for implementation support, debugging, iteration and exploring solutions faster.
Web products and interfaces shaped around clarity, responsive interaction and fast iteration.
Interactive concepts, motion, real-time experiences and playable systems taken from idea to working prototype.
Desktop tools, audio products and unconventional interfaces built around creative workflows.
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