18 Y/O•Dublin, Ireland•Tech
Liam Fuller
Youngest founder in Square Peg Capital’s portfolio, raising a €1.2M/$1.4M pre-seed round for Source at age 17 — per RTÉ Business (Jul 2025) and Forbes Australia (Jul 2025).
What they built
Source is an AI-powered retail procurement platform that automates stock purchasing for small to medium-sized retailers. Founded by Liam at age 17, it integrates with Excel, email, and ERPs to scan inventory and past sales data, generate demand forecasts, and suggest purchase orders that humans can approve with a single click. The platform solves a real gap: large retailers spend €30–40M/year on ERP systems, while SMBs are left using spreadsheets and guesswork. Source raised $1.4M pre-seed from Square Peg, former Stripe CTO David Singleton, and others.
View ProjectThe F18 Thesis
Verified track record
Updated April 27, 2026