Ján Tóth, Developer in Bratislava, Bratislava Region, Slovakia
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Ján Tóth

Verified Expert  in Engineering

Computer Graphics Developer

Bratislava, Bratislava Region, Slovakia
Toptal Member Since
May 8, 2018

Ján is a passionate developer who's keen on self-improving and keeping up to date with the latest tech. With a cognitive science background and experience in multiple programming paradigms, he feels at home in both research and production projects. Recently, he's been interested in computer graphics and has been working on small visual demos and toy compilers. Ján prefers simplicity and clarity both in his code and professional relationships.



Preferred Environment

LLDB, Linux, Emacs, Git, Terminal

The most amazing...

...thing I've helped create was an urban visualization with a live city simulation presented on three 4K displays; the 3D engine was done in-house.

Work Experience

Occasional Lead Software Engineer

2017 - PRESENT
  • Created open-source research software for parametric geometry morphing with Rust (Github.com/subdgtl/HURBAN-Selector).
  • Created a 3D engine for interactive urban models and visualizations with Electron, TypeScript, and WebGL 2.
  • Extracted and open-sourced a library from our engine for more pleasant work with WebGL.
Technologies: Electron, WebGL, TypeScript

Software Engineer

2016 - 2017
  • Developed features for the in-browser 3D editor.
  • Developed features for the Vectary platform and ecosystem.
  • Took part in a massive code refactoring and modularization of the 3D editor while keeping the features intact and delivering new ones regularly.
  • Performed code reviews and mentoring.
Technologies: Node.js, TypeScript

Software Engineer

2015 - 2016
V Lottery Systems GmbH
  • Helped write a service that analyzed player behavior and reported suspicious activity by reading a stream of game events.
  • Applied multiple refactorings on a monolithic game server codebase.
  • Wrote asynchronous prefetching networking components to ensure smooth service latency.
  • Performed countless benchmarks for informed decisions on choosing technologies.
Technologies: Java

Intern Researcher

2015 - 2015
Research Studios Austria GmbH
  • Prototyped document classification methods for the Web of Needs research project.
  • Assessed unsupervised approaches to clustering of word-meaning-vectors in text documents.
  • Designed and built a program for extracting features from natural language (to be run a part of a greater machine learning pipeline).
Technologies: Python

Software Engineer

2013 - 2014
Davinci Software, s.r.o.
  • Worked on three products developed within the company: DTA-SaaS, DTA, and DTA v2.
  • Discovered my passion for algorithms while contributing to the greenfield DTA v2 project.
  • Contributed to the revised architecture of the DTA v2 project and related improvements in performance and precision.
  • Created NFA-like algorithm for named-entity recognition embedded in the DTA v2. The approach was inspired by the design of Google's RE2 library.
Technologies: Java

Java Developer

2012 - 2013
New Frontier Slovakia, s.r.o.
  • Helped develop a back-office solution for managing the VUB Bank's product catalog.
  • Optimized the JavaScript-and-DOM-heavy app to run on IE6 (mostly by removing things from the DOM).
Technologies: JavaScript, Java


For this project, we built amazing urban models.

Webglutenfree | A Library for Saner WebGL Work

Webglutenfree is a lightweight, high-level abstraction layer on top of WebGL 2. We decided to bake this one without a state, letting everyone enjoy WebGL without worrying too much about their health.
2014 - 2015

Completed Credits (a Semester's Worth) for My Master's Degree in Cognitive Science

University of Vienna (Mobility Semester) - Vienna, Austria

2013 - 2015

Master's Degree in Cognitive Science

Comenius University in Bratislava - Bratislava, Slovakia

2009 - 2012

Bachelor's Degree in Applied Computer Science

Comenius University in Bratislava - Bratislava, Slovakia


WebGPU, React, WebGL, Node.js


Emacs, LLDB, Git, Terminal


Java, Rust, TypeScript, JavaScript, Python




Concurrent Programming, Functional Programming


MacOS, Visual Studio Code (VS Code), Linux


PostgreSQL, MySQL


System Programming, Computer Graphics

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