Denis Rozenkin
Founder at Cozy Ventures
Barcelona, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolDenis Rozenkin is a founder and technical leader with 13+ years turning product ideas into production-grade software and scalable teams from Barcelona. He blends hands-on full-stack engineering (Rails, Node, Phoenix, Flask/Django, React/React Native, Vue, Flutter) with data and AI experience, having built broker-facing AI assistants using LangChain and production systems backed by Cassandra, ClickHouse, Redis and PostgreSQL. As CEO of Cozy Ventures he advises and builds early-stage products, mentors founders, and runs a 100+ person offline founders community that fuels pragmatic product-market insights. Former CTO and VP of Engineering, he has a track record of shipping reliable, cloud-native platforms and growing engineering functions while keeping tight delivery and budget discipline. Denis pairs deep technical fluency with strong ownership and cross-functional collaboration, often translating real user workflows into practical ML/AI-enhanced features. He also holds a master's-level background in public finance, an unusual lens that helps him align product decisions with business and regulatory realities.
13 years of coding experience
15 years of employment as a software developer
Master's degree Department of Public Finance, Master's degree Department of Public Finance at Istanbul University
Russian, English, Turkish, German
Github Skills (52)
dbf9
parser8
mason8
parsing8
packaging7
python7
lua6
api6
adapter6
elixir6
testing6
react5
neovim-plugin5
package-manager5
golang5
Programming languages (6)
Github contributions (5)
nikneroz/elixir_dbf
May 2018 - Jun 2022
Small library for DBF parsing written in pure elixir
Contributions:31 commits, 2 PRs, 19 pushes in 4 years 1 month
elixirparsingelixir-langdbfparser
nikneroz/mssql_ecto
Nov 2018 - Jun 2021
Ecto adapter for Mssqlex
Contributions:1 PR, 2 pushes in 2 years 6 months
ecto-adapterelixiradapterecto
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