François Lejeune
Product Manager at FullEnrich
François is FullEnrich's first Product Manager, previously at Lemlist. He built a waterfall enrichment engine from zero to $1M in revenue and is the most credible voice on how enrichment actually works under the hood — from provider routing to match-rate optimization.
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Articles by François Lejeune
July 1, 2026
What Is Data Enrichment? The Field Guide From Someone Who Built One
Data enrichment fills missing emails, phones, and company data from external sources. How it works, single-source vs waterfall, real examples, and when to enrich vs buy a list.
March 4, 2024
Waterfall Enrichment: A Complete Guide for 2026
Waterfall enrichment queries 20+ data providers in sequence for an ~80% find rate — vs 50-60% from any single source. How it works, when to use it, and why it matters.