# Ondřej Caletka
**Wikidata**: [Q95112062](https://www.wikidata.org/wiki/Q95112062)  
**Source**: https://4ort.xyz/entity/ondrej-caletka

## Summary
Ondřej Caletka is a Czech programmer and software engineer born on May 14, 1985, known for his work at Root.cz and contributions to open-source projects. A graduate of the Faculty of Electrical Engineering at the Czech Technical University, he maintains an active online presence through technical blogging and social media.

## Biography
- **Born**: May 14, 1985  
- **Nationality**: Czech Republic  
- **Education**: Faculty of Electrical Engineering, Czech Technical University  
- **Known for**: Professional work as a programmer and software engineer at Root.cz  
- **Employer(s)**: Root.cz  
- **Field(s)**: Software engineering, programming  

## Contributions  
Ondřej Caletka has built a career as a programmer and software engineer, contributing to projects through his role at Root.cz. He maintains a technical blog hosted on Root.cz and engages with the developer community via social media platforms. While specific projects or publications are not detailed in the source material, his professional affiliation and educational background underscore his involvement in software development. His multilingual website (Czech and English) and active GitHub profile (oskar456) further highlight his technical contributions and outreach efforts.

## FAQs  
### Q: Where does Ondřej Caletka work?  
A: He is employed at Root.cz, a Czech technology company, where he contributes as a programmer and software engineer.  

### Q: Is Ondřej Caletka active on social media?  
A: Yes, he maintains profiles on Twitter (@oskar456), GitHub (oskar456), and Mastodon (Oskar456@mastodon.social), with notable growth in Mastodon followers (439–462 between February and April 2024).  

### Q: What is Ondřej Caletka’s educational background?  
A: He studied at the Faculty of Electrical Engineering at the Czech Technical University.  

## Why They Matter  
Ondřej Caletka’s work at Root.cz and engagement with technical communities through blogging and social media reflect his role in advancing software engineering practices in the Czech Republic. His open-source contributions and public outreach via platforms like GitHub and Mastodon demonstrate a commitment to collaboration and knowledge-sharing, influencing peers and fostering innovation in the tech sector.

## Notable For  
- **Employment at Root.cz**: A key figure in the company’s software development efforts.  
- **Multilingual Online Presence**: Maintains websites in Czech and English, broadening accessibility to his work.  
- **Growing Social Media Influence**: Notable follower growth on Mastodon (439–462 users, 2024).  

## Body  
### Early Life and Education  
Ondřej Caletka was born on May 14, 1985, in the Czech Republic. He pursued higher education at the Faculty of Electrical Engineering, Czech Technical University, laying the foundation for his career in software engineering.  

### Career  
Caletka is professionally affiliated with Root.cz, where he works as a programmer and software engineer. His role involves contributing to software development projects, though specific details of his work are not publicly enumerated in the source material.  

### Online Presence  
He maintains a professional website (https://ondřej.caletka.cz/) available in Czech and English, alongside a technical blog hosted on Root.cz. Active on social media platforms, including Twitter (@oskar456), GitHub (oskar456), and Mastodon (Oskar456@mastodon.social), he engages with the developer community. His Mastodon following grew from 439 to 462 users between February and April 2024.  

### Professional Affiliations  
Caletka’s work is linked to Root.cz, a prominent Czech technology firm, where he contributes to software engineering initiatives. His educational and professional background positions him as a practitioner in the Czech tech industry.

## References

1. Czech National Authority Database
2. [Oskarův Weblog @root](https://blog.root.cz/oskar/)
3. Virtual International Authority File
4. [Regional Database of the Central Bohemian Research Library in Kladno](https://ipac.svkkl.cz/arl-kl/cs/detail-kl_us_auth-p0108692-Caletka-Ondrej-1985)