Marvin Heyne
DE CV Contact

Marvin HeynePotsdam, Germany

I build agentic-AI systems that have to survive real users.

Voice agents for 100+ salons at MitJulia1, IT-Systems Engineering at HPI (GPA 1.44), and until October Founding Engineer at Kobe AI2.

Email Marvin CV (PDF, one page)

Open for internships · Apr – Sep 2027

Marvin Heyne, portrait in a dark hoodie
Potsdam, 2026

Chapter I: Curiosity

2020–2024Erfurt

Math olympiads from sixth grade, the entrance exam for a specialized STEM school in Erfurt, the federal computer-science competition.

School

Albert-Schweitzer-Gymnasium Erfurt

Abitur, specialized STEM track · 2020 – 2024

Abitur 1.4 with advanced courses in English, mathematics, physics and computer science; MINT-EC certificate with distinction. Admission by written and oral entrance exam.

Results from this chapter

Chapter II: Competition

2023–2025Erfurt · Jena · Heilbronn · Frankfurt

Thirteen years of karate. A CNN written from scratch won the Thuringian round of Jugend forscht and a special prize at the national final (2024).

Four students and a juror with certificates at the Jugend forscht national final
Jugend forscht national final, Heilbronn 2024

Research · 2023 – 2025

PneuNet, a CNN written from scratch

Built in NumPy first, then seven architectures benchmarked in PyTorch.

> 87 % classification · > 95 % segmentation5

Jugend forscht 2024: Thuringian state winner and a special prize at the national final.

Open the project page with the live demo View code

PneuNet DICOM viewer: chest X-ray with the CAM heatmap, labelled not a diagnosis (demo with sample data) Live demo · sample data Open the project page with the live demo
Fig. 2.1 The DICOM viewer from the public repo, rebuilt: window and level, measure, segmentation, the AI’s second opinion and the CAM heatmap. Try it on the project page. Not a diagnosis.

Bundesliga Hackathon 2025, in numbers3

Bundesliga fan app on a phone: the AI chat after a quiz (demo with sample data) Live demo · sample data Open the project page with the live demo
Fig. 2.2 The winning fan app, rebuilt from the Expo code. On the project page the AI chat works: FAQ, autocomplete, read aloud, quiz. Sample answers, the AWS backend is offline.
teams
42
in the final
15
winning teams, one of them ours
6

A fan app with an AI chat on AWS. Team of three; I owned the repo.

View project

Results from this chapter

Chapter III: Building

2024–2026Potsdam · Pennsylvania

A winning team at the first Bundesliga Hackathon (2025). Then production code: Founding Engineer at Kobe AI, and a voice agent for 100+ salons at MitJulia (formerly Friseurtelefon).

Study

1.44

B.Sc. IT-Systems Engineering

GPA at HPI, 108 ECTS (1.0 is best). Every exam passed at the first attempt; exchange semester planned for winter 2027/28.

A voice agent that answers salon phones

MitJulia (formerly Friseurtelefon) · Software Engineer, AI voice agents · since Jan 2026

Julia picks up 24/7 and books straight into the salon’s booking system.

100+1

salons whose calls Julia answers (Nov 2026)

  • Product issues end to end: reproduce on a real transcript, check every salon, ship the PR.
  • Test suite for the voice agent grown from 67 to 267 cases.
  • 434 commits in the monorepo, Aug – Nov 2026.
MitJulia: transcript of a salon call next to the salon dashboard with the new booking (demo with sample data) Live demo · sample data Open the project page with the live demo
Fig. 3.1 A call to a salon, from ring to booking, rebuilt from the dashboard code. The project page runs it live: pick a slot yourself while Julia offers times.

Kobe AI, your personal superconnector

Kobe AI · Founding Engineer · Mar – Oct 2026

Finds the warmest path to the person you need, through your own network.

  1. Say who you need“Three reference calls for Anna.”
  2. Kobe finds the warm pathIt checks who in your own network (LinkedIn, email, Slack, Notion) can introduce you, and ranks them.
  3. You approve, Kobe sendsIt drafts the intro request. Nothing goes out without your OK; raw data stays on your Mac.

~4702

commits in three full-time weeks (Oct 2026)

getkobe.ai
Marvin at a laptop in the Launchpad build hall, a wooden Kobe sign on the table
Shipping Kobe in the build hall, Pennsylvania
Kobe web app: introduction requests drafted and sent after approval (demo with sample data) Live demo · sample data Open the project page with the live demo
Fig. 3.2 Kobe’s “Start Mission” flow, rebuilt from the product prototype. On the project page you can type your own request or let it play.
The Kobe team on stage holding the Launchpad champion cheque over USD 100,000

Launchpad by Stan · Oct 2026

Won Launchpad with Kobe

30 teams from ~700 applications. I kept shipping Kobe and built the pitch deck in a day.

USD 100,000 · no equity6

* as announced to the teams; written confirmation pending

Read the full story

Commits by project

  • Kobe AI, Oct 2026 477 commits
  • MitJulia, Aug – Nov 2026 434 commits
  • Voya hackathon, 48 h 130 of 142 commits
  • takeøff website, 5 days 32 of 33 commits

Author commits only, from the repositories.

Also built in this chapter

Results from this chapter

All 14 projects → Full experience → All awards and hackathons →

Chapter IV: Impact

2024–2026Potsdam

Medical volunteer in Red Cross civil protection since October 2024; a workshop day for 87 eleventh-graders with my scholarship foundation. Skills only count once they work outside your own CV.

Marvin in Red Cross duty uniform next to a fire engine
Red Cross duty, Potsdam
Marvin on a ladder rigging lights and cables on a club stage
Stage build for a takeøff night

Volunteering

On the desk right now

  • since Oct 2026Bachelor's project GorillaScoutTeam of eight at Prof. Gerard de Melo's AI chair: a multi-year pipeline that detects, tracks and re-identifies wild gorillas in camera-trap video.
  • since Aug 2026Product issues at MitJuliaEnd to end, from fleet-wide analysis to the pull request.
  • 16–19 Nov 2026HPI Engine startup tour to ZurichOrganizing company visits, participant selection and budget.
  • winter 2026/27Seminar with BMW on agentic productsDetails under NDA.

Volunteering and scholarships → About →

Written along the way

Short look-backs, one per event: competitions, trips, startups.

All posts →
  1. Deep learning without the exam: why I rebuilt the course book as a website This term I'm sitting in on the Deep Learning lecture at HPI. To really understand the material, I rewrote the first part of the course book as a simplified German study site with interactive demos. 2 min · machine learning · web
  2. An agentic system with BMW: the code calculates, the model explains In the seminar Building Agentic Products we're working with BMW on a system that spots early warning signs of unplanned machine stops. An interim update, as abstract as confidentiality requires. 3 min · ai agents · industry
  3. GorillaScout: getting into a pipeline that four cohorts built before us Since October I've been in the bachelor's project that re-identifies wild gorillas in camera-trap video. An interim update on how you get into a pipeline that four cohorts built before you. 3 min · machine learning · computer vision

The next chapter is not written yet.

Open for internships, full-time April to September 2027, and an exchange semester planned for winter 2027/28.

Email Marvin

marvin.heyne@student.hpi.uni-potsdam.de

CV (PDF, one page) GitHub ↗ LinkedIn ↗

I answer within a day or two.

Sources

Every number on this page carries a footnote. These are the denominators and dates.

  1. MitJulia, formerly Friseurtelefon: 100+ salons live as of November 2026 (figure as published by the company); 434 commits in the monorepo, August to November 2026.
  2. Kobe AI, October 2026: 297 of 894 commits in the main repository, 157 of 750 in the desktop repository, 18 of 21 in the pitch deck and 5 of 263 in kobe-eve (about 477 in total, counted with two of my git identities); counted across all three, the v3 repository has 509 of 918 (5 Nov 2026). Releases 1.1.49 and 1.1.50.
  3. Bundesliga Hackathon 2025, DFL × AWS × EintrachtTech: 42 teams, 15 in the final at Deutsche Bank Park, Frankfurt; six winning teams named by the DFL, no ranking among them.
  4. HPI transcript of records, 22 October 2026: 108 ECTS, GPA 1.4 on the German scale where 1.0 is best; both named courses graded 1.0.
  5. PneuNet validation on the project's own split (above 87 percent classification, above 95 percent segmentation); Jugend forscht 2024, Thuringian state round and national final.
  6. Launchpad by Stan, October 2026: 30 teams selected from about 700 applications; the win and the USD 100,000 prize are as announced to the teams, written confirmation pending.
  7. Siemens × AWS Hackathon 2025 and AWS World Sports Innovation Cup 2026: results as announced to the teams; certificates are being collected.