Privacy Policy

Last updated: April 14, 2026

This website (mentoring.martinslaby.cz) is a personal mentoring booking page operated by Martin Slaby. This policy explains what data the site accesses, how it is used, and what is shared with third parties.

1. Google Sign-In

When you sign in with Google, the site requests the following permissions:

• Basic profile information (name, email address, profile picture) — used to identify you in the booking interface.
• Google Calendar — event access (calendar.events) — used to create a calendar event for your booked session and display your upcoming mentoring bookings. To show existing bookings, the site searches your primary calendar for events containing "Mentoring" with Martin Slaby as attendee, and reads only their title, time, and link.
• Google Calendar — free/busy access (calendar.freebusy) — used to check whether time slots on the mentor's calendar are available or busy. This only reveals busy/free status, not event details.

2. Data storage

Your sign-in session (name, email, profile picture, and access token) is stored in your browser's localStorage. There is no server or database that stores your data. The access token is sent to Google APIs when the site checks availability or creates bookings. Your name, email, and profile picture stay in your browser only. When you sign out, all stored data is deleted.

3. Booking form data

When booking a discovery call, you may optionally provide a short description, a CV link, and a LinkedIn profile link. This information is included in the Google Calendar event description that is created on your own calendar and shared with Martin Slaby as an attendee. It is not stored anywhere else.

4. Analytics

This site uses Google Analytics 4 to collect anonymous usage data such as page views, button clicks, and scroll events. Google Analytics uses cookies to distinguish users. No personally identifiable information is sent to Google Analytics. You can opt out by using a browser extension like Google Analytics Opt-out.

5. Third-party services

The site interacts with the following third-party services:

• Google Identity Services — for sign-in authentication.
• Google Calendar API — for availability checking and event creation.
• Google Analytics — for anonymous usage statistics.
• Vercel — for hosting the website.

No data is sold or shared with any other third parties.

6. No server-side processing

This is a static client-side application. All API calls to Google are made directly from your browser. There is no backend server that processes or stores your data.

7. Data deletion

To remove all data associated with your use of this site:

• Click "Sign out" on the site to clear your browser session.
• Delete any calendar events created through the booking flow.
• Revoke the app's access in your Google Account permissions.

8. Google API Services User Data Policy

This app's use and transfer to any other app of information received from Google APIs will adhere to the Google API Services User Data Policy, including the Limited Use requirements.

Specifically:

• The app only uses Google user data to provide the booking functionality described above.
• The app does not transfer Google user data to any third parties, except as necessary to provide the booking service (creating a calendar event with Martin Slaby as attendee).
• The app does not use Google user data for advertising, retargeting, or any unrelated purposes.
• No human reads your Google data unless you have explicitly shared it (e.g., by booking a session that creates a shared calendar event).

9. Data retention

Your Google access token is stored in your browser's localStorage and is automatically discarded when it expires (typically within 1 hour of sign-in) or when you sign out — whichever comes first. No Google user data is retained after your browser session ends or after the token expires.

10. Contact

For questions about this policy, contact Martin Slaby at info@martinslaby.cz, or via LinkedIn or GitHub.