Marcin Lewandowski
Chief Technology Officer at Petsy
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolMarcin Lewandowski is a seasoned technology leader and founder with 15 years of experience turning early-stage product vision into scalable businesses and shipped products. As CTO and first angel investor at Petsy, and formerly a partner at Software Mansion, he blends hands-on engineering with strategic product and go-to-market execution, having grown teams from a dozen to 200+ and steered an organization to IPO. He’s built from first commit to first customers multiple times—coding core systems, designing resilient architectures (notably the Elixir/C-based Membrane multimedia framework) and leading commercialization efforts. Comfortable in ambiguity, he balances rapid prototyping with long-term scalability, recruiting and coaching teams to move fast without sacrificing trust. An early entrepreneur who launched broadband services in high school and podcasted years before the trend, he pairs technical depth with a knack for spotting and operationalizing emerging opportunities.
15 years of coding experience
13 years of employment as a software developer
Master's Degree, Human Computer Interaction, 4.5/5, Master's Degree, Human Computer Interaction, 4.5/5 at Jagiellonian University
English, Polish
Github Skills (6)
genserver10
backend10
back-end-development10
elixir10
architecture9
architectures9
Programming languages (16)
Github contributions (5)
membraneframework/membrane_core
Nov 2016 - Nov 2018
The core of Membrane Framework, multimedia processing framework written in Elixir
Role in this project:
Back-end Developer
Back-end DeveloperContributions:145 commits, 3 pushes, 27 comments in 2 years
Contributions summary:Marcin primarily focused on developing the core functionalities of the Membrane Framework. Their commits reveal the creation and modification of base element modules, including sink, source, and filter implementations. They introduced essential features like `start_link` calls, various callbacks for playback control (prepare, play, stop), and buffer/message handling, indicating significant contributions to the framework's underlying architecture and control flow. The user also added linking functionality to connect different elements within the framework, improving its modularity.
hevcaxish264hls-streammultimedia
mspanc/heroku-buildpack-apt
Apr 2015 - Oct 2016
Contributions:21 commits, 21 pushes in 1 year 6 months
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