Marvin Heyne
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Marvin Heyne · software engineer · HPI Potsdam

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.

Selected work GitHub LinkedIn
Marvin Heyne, portrait in a dark hoodie
Open for internships · Apr – Sep 2027 Potsdam, Germany ·
  • 100+1 salons whose calls a voice agent I ship on answers MitJulia · Nov 2026
  • ~4702 commits in three full-time weeks as Founding Engineer Kobe AI · Oct 2026
  • 423 teams at the first Bundesliga Hackathon; one of the winning teams DFL × AWS · Apr 2025
  • 1.44 GPA; Software Architecture and Software Engineering both 1.0 HPI · 108 ECTS

Every number is dated and sourced. Sources ↓

Selected work

Two products, one research project, two wins

All projects →
Kobe AIFounding Engineer · Mar – Oct 2026

Kobe AI, your personal superconnector

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

  • TypeScript
  • Cloudflare Workers
  • Electron
~470 commits in 3 weeks · Oct 20262 getkobe.ai ↗
Marvin at a laptop in the Launchpad build hall, a wooden Kobe sign on the table Marvin at a desk in the build hall, thumbs up Marvin coding at two screens inside the campervan The Kobe team on stage holding the Launchpad champion cheque over USD 100,000

How Kobe works

  1. Say who you need

    “Three reference calls for Anna.”

  2. Kobe finds the warm path

    It checks who in your own network (LinkedIn, email, Slack, Notion) can introduce you, and ranks them.

  3. You approve, Kobe sends

    It drafts the intro request. Nothing goes out without your OK; raw data stays on your Mac.

Show what I builtHide what I built
  • Backend on Cloudflare Workers with Hono and Postgres row-level security.
  • An MCP server for Claude and the Electron desktop client.
  • Co-developed a six-stage agent pipeline in Python (Claude Agent SDK).
  • Releases 1.1.49 and 1.1.50, in a team of three.
MitJulia (formerly Friseurtelefon)Software Engineer · since Jan 2026

A voice agent that answers salon phones

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

  • TypeScript
  • AWS Lambda
  • ElevenLabs
  • Twilio
100+ salons · Nov 20261 Read more →
Show what I doHide what I do
  • 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.
Four students and a juror with certificates at the Jugend forscht national final The team at the AI Pneumonia Detection stand with posters and a screen Three students with certificates at the Jugend forscht national final The Jugend forscht stand seen from the audience
Jugend forschtResearch · 2023 – 2025
State winner

PneuNet, a CNN written from scratch

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

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

  • Python
  • NumPy
  • PyTorch
> 87 % classification · > 95 % segmentation5 View code ↗
The Kobe team on stage holding the Launchpad champion cheque over USD 100,000 Marvin in front of an illuminated sign reading Kobe, Launchpad Champion Marvin at a laptop in the Launchpad build hall, a wooden Kobe sign on the table The Kobe team with the Launchpad cheque at the airport
Launchpad by Stan · PennsylvaniaStartup competition · Oct 2026
Winner

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 Read more →
teams
42
in the final
15
winning teams, one of them ours
6
DFL × AWS × EintrachtTechHackathon · Apr 2025
Winning team

Bundesliga Hackathon 2025

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

  • Expo
  • React Native
  • AWS
Apr 20253 View project →
Experience

Small teams, real users.

Full timeline
  1. 2026

    Founding Engineer · Kobe AI

    Mar 2026 – Oct 2026

    AI superconnector: finds the warm intro to anyone through your own network.

  2. Software Engineer · MitJulia (formerly Friseurtelefon)

    since Jan 2026

    Julia answers salon phones 24/7 and books straight into the booking system.

  3. Student Associate · HPI Engine

    since Feb 2026

    Startup tours for 15–22 students: Munich, Amsterdam, Zurich (Nov 2026).

  4. 2025

    Solution Engineer · Leona Research

    May 2025 – Sep 2025

    Client projects for NeoTaste and international clients at a GenAI agency, full-time over the summer.

  5. 2024

    B.Sc. IT-Systems Engineering · HPI

    since Oct 2024 · Potsdam

    GPA 1.4 (1.0 is best), 108 of 180 ECTS, all exams at the first attempt.

  6. 2020

    Abitur 1.4 · Albert-Schweitzer-Gymnasium

    2020 – 2024 · Erfurt

    Specialized STEM track; MINT-EC certificate with distinction.

Skills

What I build with.

The tools behind the work above. Areas, numbers and evidence are on the About page.

  • TypeScript
  • React
  • Next.js
  • Node.js
  • Python
  • PyTorch
  • Claude
  • ElevenLabs
  • Cloudflare
  • PostgreSQL

6 areas: AI agents and evals · Full-stack TypeScript · Python and machine learning · Cloud and data · Engineering practice · Processes and requirements

All skills and evidence
About

Grew up in Erfurt, at HPI since 2024.

I build agentic-AI products in small teams and test them against real users.

Evidence before code: I reproduce a problem on a real transcript before I change the product.

Karate
1st Dan
13 years; German vice-champion U14 kumite
Red Cross
since 2024
Volunteer emergency medical responder
Travel
23 countries
incl. 17 days by van to the Arctic Circle
Full story Volunteering
Marvin coding at two screens inside the campervan
Travel and code: building Kobe on the road
Moments

Moments from the last two years.

The Kobe team on stage holding the Launchpad champion cheque over USD 100,000
Launchpad by Stan: the Kobe team wins, October 2026
Marvin at a desk in the build hall, thumbs up
Build hall at Launchpad, Pennsylvania
Northern lights over a snowy forest, two people in the foreground
Northern lights on the van trip to the Arctic Circle
Marvin on a ladder rigging lights and cables on a club stage
Stage build for a takeøff night
Marvin pitching on a stage in front of a screen
On stage
Two people at the Arctic Circle sign at night
Arctic Circle, March 2026
Three people at a desk at night during a hackathon
Late night at a hackathon
Two people in the entrance of the Lovable office
A stop at Lovable, Stockholm
CV

CV at a glance

Download CVPDF, one page, English
Wins

All awards

Scholarships
Volunteering
Languages
  • Germannative
  • Englishfluent (C1)
  • SpanishB1
  • Frenchbasic (A1–A2, UNIcert I)

Launchpad, Siemens × AWS and AWS World Sports Cup: results as announced to the teams.

Contact

Internship, project or exchange semester? Let’s talk.

Open for a full-time internship from April to September 2027.

HPI student address marvin.heyne@student.hpi.uni-potsdam.de
GitHub LinkedIn

Sources

Where the numbers on this page come from.

  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); 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.