Jan Kadlec — portfolio

I ship things that work.

Automation and AI tooling that saves people hours. Years of Java/Spring backend underneath. Results, not slide decks.

I'm here as

Automation · AI tooling · Java/Spring

České Budějovice and Prague, Czechia. Open to founders and recruiters.

Profile

I automate the manual work that eats people’s hours — and I prototype fast.

A developer who turns manual processes into automated ones — with AI tooling, agent workflows (Claude Code) and scraping. I prototype fast, test what’s real versus hype, and ship things people actually use. Behind that sits years of Java/Spring backend work, including enterprise authentication for ČEZ.

Beyond coding I lead teams and organize international events with non-profits like Students For Liberty and Junior Chamber International. In my free time I build products, follow emerging tech — and keep a few beehives.

Selected work

2 products, live

Live

Moldavite

An interactive learning platform for math and physics: problem → verification → progress. My own product — built, launched, and in use.

Nuxt

View project

Live

PriceDog

A price watchdog: price tracking with history, email alerts, and shared lists — a browser extension plus web app.

Spring Boot · Vue · Nuxt · PostgreSQL · Spring Security · Docker · Chrome extension

View project

Projects

Shikula Adresy

2026

A free address-autocomplete widget for Czech e-shops: type a street and it fills in the number, postal code, and city from the official RÚIAN registry — fewer checkout typos and returns.

adresy.shikula.cz

Vanilla JS · JSON API · RÚIAN · OpenStreetMap

Léčiva

2026

Digitised a paper-based treatment-ordering process for beekeeping associations — roughly 40 hours of manual work per cycle down to under one. Orders, QR payment codes and treasurer exports now live in one app. In use by real clubs.

leciva.jan-kadlec.cz

Go · Nuxt · PostgreSQL · SPAYD QR payments

Legalizujme

2026

Conference site for Students For Liberty CZ, run through an AI agent (OpenClaw): I message it what changed and it edits and ships the site. Adding a speaker went from a laptop task to about a minute on my phone on the metro.

legalizujme.cz

Nuxt 4 · Tailwind · OpenClaw

Buduji se

2026

A diary that takes a few minutes a day: three priorities in the morning, three things that went well in the evening, and one-minute habits. Inspired by Tomáš Baťa. Went from research notes and a clickable prototype to a free public beta in under a week. No account needed, and entries stay on the phone.

buduji.se

Web app · Android (Zapstore)

JCI Czech Republic website

2024

New website for JCI Czech Republic.

jcicr.cz

JCI European Presidents Meeting

2023

Event website plus rollup and badge graphics.

BCI Train

—

A mobile app that controls a model train using EEG brain activity.

React Native

Theoretical Informatics project

2021

Regular-set recognition using a nondeterministic finite automaton.

Skills

AI & automation: AI tooling, agent workflows (Claude Code), rapid prototyping
Scraping & data: Web scraping (Puppeteer, Apify), scheduled jobs, alerts
Backend: Java 8–24, Spring Boot, Spring Security (OAuth2, Kerberos), Hibernate
Frontend: Vue.js, Nuxt, Tailwind CSS
Data: PostgreSQL, MariaDB
DevOps & tools: Docker, Git, Coolify, Node.js

Experience

Oct 2024 – Sep 2025

Backend Developer · Kiwi Digital s.r.o.

Primary backend and some frontend for a platform to manage many screens from one place. Led the Spring Security authentication (OAuth2, Kerberos) for ČEZ, plus database migrations.

Java · Spring Boot · Spring Security · Hibernate · MariaDB · Docker · Git

Jan 2023

Web App — FAV průvodce · 1-month project

A browser app helping new university applicants through the application process, including a generated to-do list of steps.

Vue.js · Tailwind CSS · DaisyUI

Sep – Dec 2021

Java Backend Developer · Agentes IT s.r.o.

Built new features for a basketball team-management system.

Java · Spring Boot

Education

2025 – Feb 2027

prg.ai Master

Czech Technical University (CTU)

Master’s programme; thesis on improving the pre-training efficiency of transformer LLMs.

2024

Bachelor of Computer Science & Engineering

University of West Bohemia

2022

Business Informatics (exchange)

Technische Universität Wien

Leadership

2019 – now

Junior Chamber International

Secretary General, JCI Czech Republic (2024)
President, JCI Pilsen (2023)
Deputy President, JCI Pilsen (2022)
Organized events (e.g. Secret of Personal Brand) and helped run the European Presidents Meeting.
Graduate of the JCI European Academy (Sweden) and the Growth & Development Academy (Romania).

2021 – now

Local Coordinator

Students For Liberty

Regional tech support — web, video/audio, graphics — for events like LibertyCon Europe and Ukrainian Renaissance.
Organized local economics- and crypto-focused events.

Contact

Let's talk.

Looking for a developer who ships? Write to me.

České Budějovice · Prague · usually replies within 24 hours

honza@jan-kadlec.cz LinkedIn ↗