Ethan Pronev

Founder/CTO @ SideKit (YC W26)

Co-founder

Approxima· Winter 2026 🇺🇸 New York, New York, United States

in LinkedIn 𝕏 @ethanpronev

2025Co-founder· SideKit (YC W26)

Founder · since 2025

Company

SideKit (YC W26)

Role

Co-Founder & CTO

current

Stage

—

no public source

Raised

—

no public source

Based

San Francisco, CA

current

Founder / co-founder — the company's markEmployee / research role

Source: LinkedIn work history

Profile coverage5 of 7 · missing posts, contact

Approxima

Your software should build itself.

Winter 2026

Experience

Career

SideKit (YC W26)
Co-founder
Co-Founder & CTO · San Francisco, CA · 2025 – Present
2025
Citadel Securities
Software Engineer Intern · New York, New York, United States · 2024
2024
Jane Street
Software Engineer Intern · New York, New York, United States · 2024
2024
Squarepoint Capital
Software Engineer Intern · Montreal, Quebec, Canada · 2022
2022
BitGo
Software Engineer Intern · Palo Alto, California, United States · 2022
2022

Bio

Co-founder at Approxima, building the trust layer to help software development scale with AI. Previously worked on trading systems at Jane Street and Citadel Securities. Computer Science graduate from the University of Waterloo, class of 2025.