Open for internships · Apr – Sep 2027

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.

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

Two products, one research project, two wins.

All projects
Kobe AI Founding Engineer · Mar – Oct 2026

Kobe AI, your personal superconnector

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

~470 commits in 3 weeks · Oct 20262 Story and demo getkobe.ai

Ask Kobe

Your personal Superconnector

Demo with sample data

Rebuilt from the product prototype, with sample data. It plays on its own; pause it, jump to a chapter, or type your own request.

MitJulia 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.

100+ salons · Nov 20261 Story and demo
Live call

Sat 7:42 pm · outside opening hours

Sophie Regular client · recognised 01:12

Julia is listening

Init webhook · client recognised: Sophie

Hi Sophie, this is Julia, the digital receptionist at Sample Salon. How can I help?

Hi! I need an appointment next week, ideally Tuesday after work.

Sure. Wash, cut and blow-dry with Mia again?

Yes, exactly.

get-appointment-availabilities · Tue · Mia → 2 slots

On Tuesday Mia is free at 17:30 or at 18:30. Which suits you better?

18:30 is perfect.

create-booking → appointment-booked

Done. Your appointment is on Tuesday at 18:30 with Mia. See you then!

Thanks, bye!

Last 7 days

Revenue

TotalOutside opening hours 2,846 € 612 €

Bookings

TotalOutside opening hours 47 11

Calls

TotalOutside opening hours 1299Σ 2:41h · Ø 75s 31

Booking system · Tuesday

Julia books straight into the salon’s own booking system.

MiaJana 16:0016:3017:0017:3018:0018:3019:0019:30 ColourCutCutHighlightsColourUpdo

Calls

DateTimeDurationNameCall reasonCall resultBooked revenue
Sat17:580:48Paul Change Appointment moved–
Sat16:121:31Emma Transfer Transferred–
Sat14:400:36Unknown Price Information given–
Demo with sample data

The call on the left, the salon dashboard on the right. While Julia offers times, pick a free slot in the calendar yourself. Sample data.

The Kobe team on stage holding the Launchpad champion cheque over USD 100,000 Winner
Startup competition · Oct 2026

Won Launchpad with Kobe

USD 100,000 · no equity6

As announced to the teams; written confirmation pending.

Hackathon · Apr 2025 Winning team

Bundesliga Hackathon 2025

A fan app with an AI chat on AWS. Team of three; I owned the repo.3

FAQs

Demo with sample data

Rebuilt from the Expo code. The AWS backend is offline, so answers are sample answers. Tap an FAQ or start the quiz.

42teams
15in the final
6winning teams, one of them ours

Four positions since May 2025, all in teams of three to five

git / Commit activity, 2026 from the repositories
Kobe AI, Oct 2026477
MitJulia, Aug – Nov 2026434
Voya hackathon, 48 h130
takeøff website, 5 days32

Author commits only; AI-assisted commits attributed to agents are not counted. Private repositories are described, not linked.

Full experience
  1. Mar 2026 –Oct 2026
    Founding Engineer

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

    ~470 commits in 3 weeks (Oct 2026)
  2. Jan 2026 –now
    Current
    Software Engineer, AI Voice Agents

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

    100+ salons (Nov 2026)
  3. Feb 2026 –now
    Current
    Student Associate, Startup Tours

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

    8–10 visits per tour
  4. May 2025 –Sep 2025
    Solution Engineer

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

    2–3 client projects

Evidence before code.

Full story
3,200 / 0 comparisons on 400 generated catalogs against an independent re-implementation, 0 deviations

Evidence before code

I reproduce a problem on a real transcript and check every configuration before I change anything.

32 in 5 days commits on the takeøff website; 477 at Kobe in October 2026

Focused sprints

Short, intense build phases with a clear goal, then review and clean-up.

8+ projects with written agent contracts (AGENTS.md, CLAUDE.md)

Agents, openly

I use AI coding agents heavily and say so. The architecture decisions, the test strategy and the review are mine.

Marvin coding at two screens inside the campervan

Before I change a product I reproduce the problem on a real transcript and sweep every configuration in the fleet. Defaults stay conservative, per-customer opt-in rather than global switches. Every hand-over names what I did, what I did not do, and what could go wrong, written so that a non-engineer can follow it.

Stack I ship with
TypeScriptReactNext.jsNode.jsPythonPyTorchClaudeElevenLabsCloudflarePostgreSQL
Skills, with evidence

Wins, prizes and two scholarships.

All awards
  1. Oct 2026
    Launchpad by Stan Winner on Demo Day · Pennsylvania, USA
    USD 100,000 As announced to the teams; written confirmation pending.
  2. Jun 2026
    AWS World Sports Innovation Cup 2026 Winning team · Frankfurt
    As announced to the teams; written confirmation pending.
  3. May 2025
    As announced to the teams; written confirmation pending.
  4. Apr 2025
    Bundesliga Hackathon 2025 Winning team · Frankfurt
  5. Jul 2024
    JugendUnternimmt Summer School First place, pitch competition · Erfurt
  6. Feb – Jun 2024
    Jugend forscht 2024 Thuringia, plus the DGUV special prize at the 59th national final · Weimar · Jena · Heilbronn
    State winner
Scholarships and programs sdw Klaus Murmann FellowshipSparkassenstiftung Erfurt scholarshipMcKinsey Firsthande-fellows.net online scholarship

Notes from hackathons, trips and teams.

All posts
Interim update, written shortly after the first interim review.

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.

8 Nov 2026 · 3 min read
Interim update, written in the project's first month.

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.

7 Nov 2026 · 3 min read

Moments from the last two years.

Northern lights over a snowy forest, two people in the foreground
Marvin at a desk in the build hall, thumbs up
Marvin on a ladder rigging lights and cables on a club stage
Two people at the Arctic Circle sign at night
Two people in the entrance of the Lovable office
Three people at a desk at night during a hackathon
Marvin pitching on a stage in front of a screen
Now
  1. since Oct 2026Bachelor's project GorillaScout

    Team 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.

  2. since Aug 2026Product issues at MitJulia

    End to end, from fleet-wide analysis to the pull request.

  3. 16–19 Nov 2026HPI Engine startup tour to Zurich

    Organizing company visits, participant selection and budget.

  4. winter 2026/27Seminar with BMW on agentic products

    Details under NDA.

Contact

Internship, project, or exchange semester: let's talk.

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

Sources

  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.