2x founder

Alexander Urbanski

Co-Founder @ Ultrasonium (YC S26)

Co-founder

Ultrasonium· Summer 2026 Greater Boston

in LinkedIn 𝕏 @urban_alex42

2026Co-founder· Ultrasonium

Founder · since 2023

Company

Ultrasonium

Role

Co-Founder

current

Stage

—

no public source

Raised

—

no public source

Based

Boston, Massachusetts, United States

current

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

Source: LinkedIn work history

Profile coverage5 of 7 · missing posts, contact

Ultrasonium

Manufacturing the metal parts the world runs on faster, cheaper, safer

Summer 2026

Experience

Career

Ultrasonium
Co-founder
Co-Founder · Boston, Massachusetts, United States · 2026 – Present
2026
Bay State Energy
Co-founder
Co-Founder · Boston, Massachusetts, United States · 2023 – 2025
2023
ReHome
Software Engineer · Cambridge, Massachusetts, United States · 2024
2024
Caribbean Science Foundation
Electronics & Calculus Teaching Assistant · Barbados · 2023
2023
Argonne National Laboratory
R&D Engineer · Lemont, Illinois, United States · 2022
2022
Phase3D
R&D Engineer · 2022
2022
DARIEN STUDY CENTER INC
Competitive Robotics Coach · Darien, IL · 2021 – 2022
2021
DARIEN STUDY CENTER INC
Quantitative Researcher · Darien, IL · 2020 – 2021
2020
Rogue
Pro · 2017 – 2020
2017

Bio

Founder & Chief Research Officer of Ultrasonium. Former founder of the DOE-funded nuclear startup Bay State Energy and inventor of the Nuclear Thermoelectric Generator. Studied physics at Boston University. First hire at Phase3D - built and commercialized metals manufacturing tech.