Jan Härkönen
Senior Full Stack Developer
Writing software that's pleasant to look at
I'm most proficient with
Taito United Oy
2025 - present
Developing product data management software
Pion Blanc Oy
2024 - 2025
Helping small businesses navigate their massive product data pipelines and automating their sales processes.
Polycon Oy
2021 - 2024
Developing and maintaining software and databases for handling mobility aid items for Finnish hospital districts.
Semantum Oy
Feb 2020 - Sep 2020
Developing LCA dashboard for assessing environmental impact of factory processes.
Aalto University School of Science
Jun 2019 - Dec 2019
Simulating and calculating the annihilating electron-positron pair momentum density in a solid in the atomic scale using quantum Monte Carlo methods (Master's thesis).
Aalto University School of Science
Summer 2018
Simulating and calculating the enhancement factor in a semiconductor in the atomic scale using quantum Monte Carlo methods (Special assignment).
Featured Projects
2025
Simple list+checkbox based tool for collaborative task management with real-time synchronization.
2025
Personal finance tracker
2025
Lightning-fast PostgreSQL database exploration with intuitive search and filtering capabilities.
2025
A tool to search and filter a vast array of products blazingly fast.
2025
Bash CLI tool to cd into directories 10x faster.
2025
API for manipulating images directly from URL parameters + platform to save own pictures in the cloud.
2025
Web application to track the progress level listed items for each user in real time using websockets.
2024-2025
Product data synchronization and sales processes automation tool as a web app aimed at small businesses.
2024-2025
This very website. A personal full stack developer portfolio made with Next.js.
2021
Mobile application to track the progress level of each item in a list.
2015
Desktop GUI for simulating the trajectory of a laser beam through curved lenses and mirrors.