Jakob Borg
Senior Software Engineer at Kastelo Inc.
Greater Malmö Metropolitan Area Sweden
Summary
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Top expert inComprehensive Self-Hosting and Secure Communication Solutions
Jakob Borg is a senior software engineer with 16 years of experience building resilient distributed systems and developer tools, currently at CoreWeave and founder/maintainer of notable open-source projects including Syncthing, Kastelo and Safe Sky. Based in Malmö, he blends deep back-end and DevOps expertise with full-stack macOS app work, demonstrated by low-level networking and TLS improvements in syncthing-macos and memory-leak fixes in Syncthing’s core. He has led technical consulting engagements through Kastelo and advised aviation-focused Safe Sky Industries, bringing both product-focused engineering and operational leadership. Longstanding contributions to widely used open-source tooling and hands-on experience across networking, cloud and systems software mark him as an engineer who moves between code, docs and infrastructure with equal fluency.
17 years of coding experience
18 years of employment as a software developer
Computer Science, Computer Science at The Faculty of Engineering at Lund University
Swedish, English
Stackoverflow
24,025reputation
2.2mreached
193answers
5questions
git
top-1%
cocoa-touch
top-5%
interface-builder
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github
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iphone
top-5%
makefile
top-1%
Github Skills (53)
json10
objective-c10
git10
code-optimization10
back-end-development10
apidoc10
python10
technical-writing10
makefile10
data-sync10
rsync10
file-sharing10
go10
file-copy10
api10
Programming languages (22)
Github contributions (5)
calmh/unifi-api
Nov 2012 - Dec 2016
[UNMAINTAINED] An API towards the Ubiquity Networks UniFi controller
Role in this project:
Back-end Developer
Back-end DeveloperContributions:38 commits, 15 PRs, 11 pushes in 4 years 1 month
Contributions summary:Jakob primarily contributed to the development and maintenance of the `unifi-api` project. Their contributions included implementing support for different UniFi controller API versions, specifically v3, which involved modifying the API request paths and data handling. They added and updated documentation and examples, as well as addressing SSL-related issues and creating a setup script. Furthermore, the user made adjustments to correctly encode JSON commands.
apicontrollerubiquitypython-3unifi
syncthing/syncthing
Dec 2013 - Jan 2023
Open Source Continuous File Synchronization
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:202 releases, 1313 reviews, 4296 commits in 9 years 2 months
Contributions summary:Jakob contributed to the Syncthing project by focusing on back-end improvements related to memory management and code efficiency, as well as infrastructure aspects. Their contributions included addressing memory leaks in sentry crash report handling by using a global client and ensuring proper resource cleanup. They also worked on the relay's client, helping address issues, alongside additions to build and automation scripts for improved integration.
synchronizationfile-synchronizationp2pcontinuouspeer-to-peer
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