Claes Jakobsson
R&D Engineer at FOSS-Sthlm
Stockholm, Stockholm County, Sweden
Summary
👤
Senior🎓
Top SchoolClaes Jakobsson is an R&D engineer and entrepreneur with 22 years of experience building everything from 8-bit MCU firmware to large-scale payment systems and distributed backends. Based in Stockholm, he is a long-time open source contributor and community organizer—co-founding FOSS-Sthlm, authoring numerous CPAN modules, and speaking at conferences since the late 1990s. He co-founded Botani.st to create modular smart-gardening solutions while serving as an R&D engineer at Trustly, where his work has spanned low-level C, Python, Java, and production-safe infrastructure for financial systems. Known for tackling problems others call blockers, he blends hands-on coding, cryptography/PKI knowledge, and practical DevOps to deliver dependable systems. Quietly prolific, his footprint includes niche but widely reused CPAN libraries and bespoke integrations (browser emulation, hardware USB interfaces, and PKCS#11 tooling) that bridge legacy and modern platforms.
22 years of coding experience
13 years of employment as a software developer
KTH Royal Institute of TechnologyThorildsplan
Swedish, English, Spanish, German
Github Skills (66)
rtsp10
http10
websocket10
security10
pop310
command-line-tool10
sftp10
encryption10
hashicorp-vault10
mqtt10
ftp10
secrets10
ftps10
vault10
golang10
Programming languages (4)
Github contributions (5)
botanist/eagle-lbr
Nov 2015 - Jul 2017
Contributions:23 commits, 17 pushes, 1 branch in 1 year 8 months
trustly/pg_badplan
Mar 2018 - Jan 2019
A PostgreSQL extension for logging queries where the expected/actual rows ratio exceeds a defined value
Contributions:11 commits, 1 PR, 2 pushes in 10 months
definedpostgresql-extensionloggingratiopostgres
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