Mario Callisto
Chief Operating Officer
Milan, Lombardy, Italy
Summary
👤
Senior🎓
Top SchoolMario Callisto is a experienced technology executive and entrepreneur with 14 years in ICT and a career spanning product startups, consulting, and corporate IT leadership. As COO of NoteK and a longtime freelance Scala developer, he blends hands-on engineering in Scala/Scala.js and Big Data with operational leadership, having built teams, led major infrastructure migrations, and run product launches from prototype to mass production. He co-founded hardware and IoT ventures, led firmware and mobile app development for consumer products, and managed international supply chains and go-to-market strategies. Notably, he created and maintains open libraries for graph structures and circular sequences, demonstrating a persistent developer mindset alongside executive responsibilities. Based in Milan, he pairs business administration grounding with a track record of turning technical innovation into marketable products across Europe, China, and the U.S.
14 years of coding experience
18 years of employment as a software developer
Business Administration, Business Administration at Università degli Studi di Genova
English, Spanish
Github Skills (123)
symmetry10
type-constraints10
javascript10
combinatorics10
ring10
scalajs-react10
graph10
scala10
documentation10
definitelytyped10
open-source10
rotation10
scalajs10
frontend10
sequence10
Programming languages (9)
Github contributions (5)
scala-tessella/ring-seq
Jan 2022 - Aug 2022
Extends Scala Seq with ring (circular) methods
Contributions:8 releases, 315 commits, 75 PRs in 7 months
scalacircularringnecklacesequence
scala-tessella/tessella
Apr 2024 - May 2026
Tilings by regular polygons
Contributions:4 releases, 41 PRs, 207 pushes in 2 years 1 month
graphsscalatessellation
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