Josh Bolton

Things I've made

I made Motivator, a running coach that talks to you while you run.

Pick a coach, then go ↗

Roseman Labs, Utrecht

Multi-party computation: several parties compute one result without sharing their raw data.

Product Manager

Since January 2026 ↗

BeerShelf keeps every beer I've tried, with notes and a map.

Tasting journal ↗

British School in the Netherlands, 2019

40/45

International Baccalaureate

Radar: describe a trading setup, test it on past prices, get an alert when a market matches.

Crypto scanners ↗

Lately at Roseman Labs

• Live Three German banks share fraud signals through our platform with spotixx, without exposing customer data. ↗
• Oct 2026 EU Eurostars grant with spotixx to scale cross-bank fraud prevention. ↗
• Jan 2026 UMC Utrecht won the Dutch Privacy Award for a child-abuse signalling tool built on our technology. ↗

Scrum.org, Nov 2025

Professional Scrum Product Owner I

Credential 1270137

Experience

Roseman Labs

Privacy software built on multi-party computation. Utrecht, 2021 to now.

4 roles, 1 company

1. Jan 2026 to now

   Product Manager

   I own product direction, the roadmap and the backlog, and work with engineering, customers and sales to decide what we build next.

2. Aug 2022 to Jan 2026

   Product Designer

   UI design, user testing, market research, tutorials and documentation. I wrote explainers on multi-party computation and secret sharing, built the company website, hired four colleagues and ran intern onboarding.

3. Nov 2021 to Aug 2022

   Strategy Analyst

   Part-time, alongside my degree.

4. Aug 2021 to Nov 2021

   Strategy Intern

   Internship.

School and certificates

• Nov 2025Professional Scrum Product Owner I, Scrum.org
• Nov 2025Human-Computer Interaction, Interaction Design Foundation
• Oct 2025API Fundamentals Student Expert, Postman
• Mar 2024UI Design Patterns, Interaction Design Foundation
• 2019 to 2022University of Amsterdam, BSc Economics and Business Economics. 8.1 GPA.
• 2006 to 2019The British School in the Netherlands, IB 40/45 and 10 A* at GCSE.

Things that didn't last

Side projects from before the apps. Some made a little money. None of them lasted.

1. 2019 to 2020

   techtrusted.net ↗

   A tech blog with 56 tutorials and reviews. Traffic came from Quora and search: 31.1K views, mostly from the US, the UK and Canada, and about $1,000 from affiliate links.

   Archived
2. Until 2020

   GCSE maths on Skillshare

   Maths courses that reached $250 a month, until Skillshare decided GCSE maths wasn't creative enough for the platform.

   Removed
3. 2016

   Dropshipping jewellery store

   Short-lived, and not the direction I wanted to go in.

   Closed
4. 2014 to 2015

   Two apps at 14

   PewDiePie Central and TheGadgetShow Hub. They ended with a copyright notice, addressed to my rather surprised dad (I wasn't old enough to have my own developer account).

   Copyright notice
5. Podcast

   The Dave and Josh Show ↗

   A podcast with Dave. We made 37 episodes.

   37 episodes