Johan Sannemo
Software Engineer at Stripe
Stockholm, Sweden
Summary
👤
Senior🎓
Top SchoolJohan Sannemo is a software engineer based in Stockholm with a decade of experience building scalable systems at top-tier tech companies including Stripe, Google, Huawei, and Kattis. He blends deep algorithmic expertise—evidenced by contributions to the well-regarded KTH competitive programming library (kactl)—with pragmatic product engineering across payments and infrastructure domains. Known as a strong problem solver and passionate mentor, he has held roles from intern to principal and enjoys improving both code correctness and team capability. Johan’s background in competitive algorithms and teaching signals a knack for elegant, efficient solutions that stand up under production constraints.
10 years of coding experience
9 years of employment as a software developer
KTH Royal Institute of TechnologySecondary education, Mathematics, Secondary education, Mathematics at Danderyds Gymnasium
Swedish, English, German, Russian
Stackoverflow
316reputation
22kreached
8answers
0questions
Github Skills (15)
algorithm10
data-structures10
graph-algorithms10
c-language10
cprogramming-language10
data-structure10
geometry9
java6
facebook-graph-api6
jpa6
eclipse-rcp6
sql6
playframework6
android6
32bit-64bit6
Programming languages (16)
Github contributions (5)
kth-competitive-programming/kactl
Jun 2017 - Nov 2021
KTH Algorithm Competition Template Library (... eller KTHs AC-tillverkande lapp)
Role in this project:
Algorithm Developer
Algorithm DeveloperContributions:1 PR, 1 comment in 4 years 5 months
Contributions summary:Johan primarily contributed to the KTH Algorithm Competition Template Library by updating and enhancing existing code. Their work involved modifying and adding code related to graph algorithms, combinatorial mathematics, and geometry, including matrix tree theorem, tree power, multinomial calculations, DFS matching, and geometric functions. The user's updates suggest a focus on improving the functionality, efficiency, and potentially the correctness of the algorithms in the library.
lappcppnotebookkthcompetitive-programming
jsannemo/omogenjudge
Aug 2017 - Sep 2022
Contributions:3 reviews, 45 commits, 37 PRs in 5 years 1 month
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