John-john Markstedt
Business Developer at Vermiculus Financial Technology
Umeå, Västerbotten County, Sweden
Summary
👤
Senior🎓
Top SchoolJohn-john Markstedt is a business developer and software engineer with eight years of experience building financial technology and trading systems from Umeå, Sweden. He blends hands-on engineering—several roles at Nasdaq and a master’s thesis at Cinnober—with strategic leadership as CTO and board member at Arboreal and now Business Developer at Vermiculus Financial Technology. Comfortable moving between code and product, he has progressed from trainee to senior manager-level responsibilities in low-latency, mission-critical environments. His background includes international study in finance and postgraduate work in Toronto, giving him a rare cross-section of technical depth and market-savvy. Known for a dry, meta sense of humor, he’s the kind of engineer who writes software that usually works and thinks about why it didn’t when it doesn’t.
8 years of coding experience
8 years of employment as a software developer
Master of Science in Engineering Computing Science, Master of Science in Engineering Computing Science at Umeå UniversityPostgraduate studies, Postgraduate studies at University of TorontoExchange studies in Finance and Business, Exchange studies in Finance and Business at Macau University of Science and Technology
Github Skills (14)
plugin8
params6
c-lightning6
filesystem6
cryptocurrency5
lightning5
bitcoin4
blockchain4
cryptography4
lightning-network4
react-native4
java3
file-system-access2
react1
Programming languages (5)
Github contributions (5)
Johnstedt/frithspeed
Feb 2019 - Apr 2026
Contributions:65 pushes, 1 branch in 7 years 2 months
Johnstedt/Tremory_Lib
Jan 2018 - Oct 2018
Contributions:82 commits, 32 pushes, 1 branch in 9 months
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