Ji Hyun Kim — Berlin

Hi, I'm Ji Hyun — I build products that really solve user problems.

Product Manager with 4+ years in regulated, high-stakes products. I started as a UX researcher, so I look past feature requests to the problem underneath.

Get in touchView CV ↓
Ji Hyun Kim
FocusRegulated B2B/B2C platforms, discovery, pricing, experimentation, AI features
Builds withClaude Code, React, Next.js, Supabase, Vercel
LanguagesGerman (C2), English (C1), Korean (C1)
StudiedMSc Behavioral Economics, Erasmus University Rotterdam

Teams I've worked with

CASE STUDY 01

Pricing & conversion

+30% YoY revenue+11% conversion

Germany's leading digital energy-certificate platform was growing, but its pricing hadn't kept pace with the market and too many customers dropped off before buying.

PROBLEMOutdated pricing, a weak value story and friction in the funnel.
WHAT I DIDBenchmarked competitor economics, redesigned the offering, ran A/B tests on value communication.
SHIPPEDA new pricing model, plus a feature built straight from customer pain points.
CASE STUDY 02

AI for energy advisors

−18% issuance time

Advisors compared old and new energy certificates by hand during every issuance. It was slow, repetitive and easy to get wrong, which made it a good job for AI.

PROBLEMA manual comparison step inside a core operational workflow.
WHAT I DIDMapped the advisor workflow, scoped the AI task, defined guardrails and success metrics.
SHIPPEDAn AI comparison feature built into the issuance flow.

ALSO SHIPPED

CASE STUDY 03

DIN V 18599

−60% turnaround time

Translated a national regulatory update into requirements with engineering and energy advisors — automated, compliant certificate processing, live before the deadline.

CASE STUDY 04

Vermietet.de research

+13% satisfaction score

Owned the landlord research vertical across squads: interviews, usability tests, Business × Tech workshops. Research-led priorities that shaped the ImmoScout24 integration.

Side projects

My notes app is full of ideas that never got built. Since I started working with Claude Code as my coding partner, a few of them have actually shipped. I take each one from scoping to launch myself.

[01]
USC Workout Map

A PWA that helps my Berlin friend group coordinate Urban Sports Club sessions: who's going where, and when.

problem → Our group chat couldn't answer "who's at which studio tonight?"
shipped → Map, group sessions and push reminders, delivered milestone by milestone with Claude Code.
ReactSupabaseMapboxWeb PushClaude Code
shipped ↗
[02]
This portfolio

Designed and built by me with Claude Code, deployed on Vercel. You're looking at it.

Next.jsVercelClaude Code
2026

Where I come from

I studied business and economics in Frankfurt, then behavioral economics in Rotterdam, because I kept wondering why people decide the way they do. That question led me into UX research.

At Vermietet.de I ran research for several squads at once: interviews, usability tests, and workshops that put Business and Tech in the same room. It taught me to look past what people ask for and find the problem underneath it.

Since 2024 I've been the only PM on Energieausweis48, working directly with a small engineering team on regulation, pricing, AI and reliability. Outside work I build my own products, because shipping something yourself is the quickest way to understand it.

When I'm not talking to users, I'm probably sewing new clothes, making kimchi, or trying a new USC class somewhere in Berlin.

Experience

Download PDF ↓Full CV page ↗
Mar 2024 — now
Berlin

Product Manager

ImmoScout24 / Energieausweis48 · sole PM

  • Owned the DIN V 18599 response; automated processing cut turnaround by 60%
  • Shipped an AI comparison feature for energy advisors, cutting issuance time by 18%
  • Redesigned pricing and offering for 30% YoY revenue growth; +11% conversion from discovery-led work
  • Scoped B2B API integrations, led refactoring that reduced errors by 19%, and acted as Data Protection Coordinator
Apr 2022 — Mar 2024
Berlin

UX Researcher (Junior → Professional)

ImmoScout24 / Vermietet.de

  • Led discovery across several squads; satisfaction scores rose by 13%
  • Competitive benchmarking that shaped strategic roadmap priorities
  • Facilitated Business × Tech workshops and supported the ImmoScout24 integration
Earlier

Founder's Associate, T-rtle · Business Development, Tomorrow · UX Research, DKB Code Factory

Education
MSc Behavioral Economics · Erasmus University Rotterdam2020 — 2021
BSc Business Administration & Economics · Goethe University Frankfurt2016 — 2019

Let's build something meaningful.

jihyunkim749@gmail.com
LinkedIn ↗+49 1573 9081140