# Jiří Třečák

> Jiří Třečák is the Czech founder and CEO of Supernova, a San Francisco-based software company that connects design systems, product documentation, and production code. A hands-on engineer who built more than 70 apps and websites before founding the company, he took Supernova from Ostrava to Y Combinator, rebuilt its original design-to-code product around the harder problem of organizational context, and announced a $9.2 million Series A alongside Supernova 3.0 in September 2025.

- **Role:** Founder and CEO at Supernova
- **Organizations:** Supernova, Y Combinator, STRV, StartMonday, Bizzy Labs
- **From:** Ostrava, Czech Republic
- **Nationality:** Czech
- **Education:** Bachelor of Applied Science in Applied Informatics, University of Ostrava, Information Technology, VŠB - Technical University of Ostrava, Winter 2019 accelerator participant, Y Combinator
- **Known for:** Co-founded and leads Supernova., Led Supernova into Y Combinator's Winter 2019 batch; the company was described as the first Czech startup accepted to the accelerator's core program., Named to Forbes Czech Republic's 30 Under 30 list in 2019.

## Career timeline

- **2001-2016** — Worked across freelance engineering and product projects; later accounts credit him with helping create more than 70 mobile apps and websites.
- **2014-2015** — Worked on mobile and product at Bizzy Labs and helped build the HR startup StartMonday in Amsterdam.
- **2015-2016** — Worked as a senior mobile engineer at STRV.
- **2016** — Began building the company that became Supernova with collaborators in Ostrava.
- **2017** — Credo Ventures made an early investment after the team demonstrated the product, including a custom app assembled on the train to the pitch.
- **2018** — Launched Supernova's original design-to-code product.
- **2019** — Joined Y Combinator's Winter 2019 batch and was named to Forbes Czech Republic's 30 Under 30.
- **2021** — Moved to the United States with his wife while Supernova split sales and marketing in the US from development in Europe.
- **2022** — Announced a $4.8 million seed round and a next-generation design token manager.
- **2024** — Introduced Forge as an early look at design-system-aware frontend automation.
- **2025** — Announced Supernova 3.0, Supernova Portal, and a $9.2 million Series A led by Taiwania Capital.

## Achievements

- Co-founded and leads Supernova.
- Led Supernova into Y Combinator's Winter 2019 batch; the company was described as the first Czech startup accepted to the accelerator's core program.
- Named to Forbes Czech Republic's 30 Under 30 list in 2019.
- Helped create more than 70 mobile apps and websites before Supernova.
- Presented Supernova during Google Flutter Interact 2019.
- Raised a $4.8 million seed round in 2022 and a $9.2 million Series A in 2025.
- Built Supernova into a platform used publicly by companies including Mozilla, Paramount, Skyscanner, KLM, Air France, Mews, and Mayo Clinic.

## Latest updates

- **2025-09** — Announced a $9.2 million Series A led by Taiwania Capital, with participation from J&T Ventures, Reflex Capital, Kaya VC, existing investors, and Y Combinator.
- **2025-09** — Introduced Supernova 3.0 and Supernova Portal, extending the platform from design-system management into AI-assisted ideation, prototyping, specifications, and delivery.
- **2025-10** — Wrote that AI is changing company operations structurally and argued that Czech companies can benefit from rapid adaptation.
- **2025-12** — Supernova's year-end review highlighted the Series A, Portal, and continued product improvements heading into 2026.

## Links

- Website: https://www.supernova.io
- LinkedIn: https://www.linkedin.com/in/jiri-trecak
- Twitter/X: https://twitter.com/JiriTrecak
- GitHub: https://github.com/JiriTrecak

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Profile page: https://yespress.io/jiri-trecak
Published by YesPress — https://yespress.io
Last updated: 2026-08-18