# Semion Sidorenko

Founder at Prospex

Semion Sidorenko is the Founder and CEO of Prospex. From data engineering to machine learning research, he spent 15 years helping companies scale up data platforms. Before founding Prospex, he worked as an ML engineer at EPFL and as an independent data engineering consultant for Swiss companies.

[LinkedIn](https://www.linkedin.com/in/semionsidorenko/)[GitHub](https://github.com/ssidorenko)[semion.sidorenko.ch](https://semion.sidorenko.ch/) [hello@prospex.ch](mailto:hello@prospex.ch)

Published Sept. 6, 2026, updated Sept. 6, 2026.

## Guides

- [Reading SHAB/FOSC: A Practical Guide for Salespeople](https://prospex.ch/guides/reading-shab-fosc/)
- [Moneyhouse alternative for Swiss B2B prospecting](https://prospex.ch/guides/moneyhouse-alternative/)
- [business-monitor.ch alternative for Swiss prospecting](https://prospex.ch/guides/business-monitor-alternative/)
- [Zefix, Moneyhouse or SHAB: Which One to Use](https://prospex.ch/guides/compare-swiss-company-data/)
- [What Happens When a Swiss Company Increases Its Capital](https://prospex.ch/guides/what-capital-increase-means/)
- [Zefix API: credentials, firm/search and the PublicREST endpoints](https://prospex.ch/guides/zefix-rest-api/)
- [SHAB API: reading amtsblattportal.ch/api/v1/publications](https://prospex.ch/guides/shab-api/)
- [Swiss Buying Signals in Clay and n8n](https://prospex.ch/guides/swiss-signals-clay-n8n/)
- [Sizing a Swiss Target Market from Public Data](https://prospex.ch/guides/size-a-swiss-target-market/)
- [Finding Companies Like Your Best Customers in Switzerland](https://prospex.ch/guides/similar-companies-switzerland/)
- [Reactivating Dormant and Closed-Lost Accounts](https://prospex.ch/guides/reactivate-dormant-accounts/)
- [How Big Is the Swiss B2B Market, Really?](https://prospex.ch/guides/swiss-b2b-market-size/)

[All guides](https://prospex.ch/guides/)

## Blog

- [One new Swiss company in thirty-six now claims AI](https://prospex.ch/blog/ai-companies-in-switzerland-what-the-commercial-register-shows/)
- [Switzerland’s invisible skyline: why Zug towers over the rest](https://prospex.ch/blog/switzerlands-invisible-skyline-companies-by-building/)

[All posts](https://prospex.ch/blog/)

## Rankings

- [Swiss companies that raised capital more than once (last 12 months)](https://prospex.ch/signals/repeat-capital-raisers/)
- [The 25 largest capital raises in French-speaking Switzerland (last 12 months)](https://prospex.ch/signals/capital-raises-romandie/)
- [The 25 largest mergers in Switzerland (last 12 months)](https://prospex.ch/signals/largest-mergers/)

[All rankings](https://prospex.ch/signals/)