Fredrik Corneliusson
Senior Software Developer at Ictech
Greater Gothenburg Metropolitan Area Sweden
Summary
🤩
Rockstar🎓
Top SchoolFredrik Corneliusson is a senior software developer with 9 years of professional experience building reliable, high-performance backend systems and automation tools for finance, aviation, and marketplace platforms. He combines deep practical knowledge of distributed systems, reactive and microservice architectures (Java, Spring Boot, Python, Kubernetes) with a long-standing fascination for AI—having spent the last five years focused on ML, statistics, and data-driven tooling. Fredrik has driven end-to-end projects from design to delivery, including mission-critical banking backends, airline crew-management integrations, and an AI-driven report-review tool for forestry. He is an active contributor to open-source, notably improving yfinance with thread-safe timezone caching and type-safety enhancements, showing a knack for pragmatic reliability fixes. Based in Greater Gothenburg, he brings a hardware-software background and hands-on ownership cultivated across roles from telescope engineering to leading teams and mentoring developers.
9 years of coding experience
28 years of employment as a software developer
Natural Science, Natural Science at Municipal Adult EducationElectronics and Computer Programme (Elektronik och Datorkunskap), Electronics and Computer Programme (Elektronik och Datorkunskap) at Porthälla gymnasiumThe Electrical Engineering Programme, The Electrical Engineering Programme at Linälvs gymnasiumMilitary service, Stabstropps gruppchef, Military service, Stabstropps gruppchef at Norrland Signal Corps (S3 Boden)
Stackoverflow
124reputation
118kreached
2answers
0questions
Github Skills (18)
caching10
stock-data10
sqlite10
python10
multithreading10
financial-data10
price-data10
market-prices10
thread10
hyper-threading10
threaded10
pandas9
html6
word-wrap6
localization6
Programming languages (3)
Github contributions (5)
ranaroussi/yfinance
Oct 2022 - Nov 2022
Download market data from Yahoo! Finance's API
Role in this project:
Back-end Developer
Back-end DeveloperContributions:22 reviews, 41 commits, 22 PRs in 1 month
Contributions summary:Fredrik significantly improved the `yfinance` library's functionality by implementing a more reliable and thread-safe timezone caching mechanism using SQLite. They addressed bugs related to timezone caching and data migration from CSV to SQLite. Moreover, the user added type hints and made code improvements to enhance the code's stability, maintainability, and readability of the library.
stock-marketapipythonfinancial-datafix-yahoo-finance
fredrik-corneliusson/click-web
Jan 2019 - Oct 2021
Serve click scripts over the web
Contributions:10 releases, 106 commits, 11 PRs in 2 years 9 months
javascriptnodejsclickserve
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