Portfolio
What we built and shipped before Lema Lab
Mateusz · Senior data scientist
Data science at telecom scale
Millions of customer records turned into retention
As a senior data scientist at a major telecom operator, Mateusz built and deployed ML models across product, support, and billing data to improve retention at scale.
Churn & retention modelling
Early churn signals surfaced across millions of subscribers.
Production ML pipelines
Reliable pipelines across product, support, and billing data.
Model output to weekly action
Complex results turned into clear actions teams run weekly.
Bart · Founder & AI builder
Kali AI
An AI assistant that supports patients and relieves the medical secretariat
A French AI agent for surgical and ambulatory practices. It guides patients through their care and automates the recurring tasks that weigh down secretariats.
Answers patients 24/7
A conversational agent that handles patient questions around the clock.
Fewer no-shows
Automated reminders and follow-ups lift adherence and cut missed appointments.
Live in under an hour
Fast onboarding, interoperable with existing medical software.
Health-grade & compliant
Built to health-data regulations, with secure care pathways.
Bart’s role: built and launched Kali from zero to enterprise rollout, raising €1M.
Want us to build the next one?
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