Joakim Hassila
Co-Founder & CTO at Hassila Enterprises
Stockholm County, Sweden
Summary
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RockstarJoakim Hassila is a veteran software leader and founder with over a decade of hands-on experience building high-performance trading systems and developer teams from the ground up. As Co-Founder & CTO of Ordo One and founder of Hassila Enterprises he combines product vision, system design and performance engineering—skills honed from scaling Tbricks into an acquisition and leading global R&D organizations at Orc/Itiviti. He is deeply pragmatic: shipping production-quality architectures, optimizing low-level networking and memory behavior, and establishing engineering processes that sustain product consistency. An active contributor to SwiftNIO, Joakim has fixed critical performance and stability bottlenecks in a widely used async networking framework, reflecting his focus on real-world system reliability. Based in Stockholm, he blends entrepreneurial drive with a rare mix of kernel-level optimization instincts and long-term product stewardship.
10 years of coding experience
21 years of employment as a software developer
English, Swedish
Github Skills (11)
asynchronous10
swift-nio10
event-driven10
swift10
high-performance10
non-blocking10
networking10
async10
software-design8
sys8
system-design8
Programming languages (14)
Github contributions (5)
apple/swift-nio
Mar 2021 - Apr 2021
Event-driven network application framework for high performance protocol servers & clients, non-blocking.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:114 reviews, 7 commits, 10 PRs in 1 month
Contributions summary:Joakim contributed to the SwiftNIO networking framework by addressing performance bottlenecks and improving stability. They optimized the `AdaptiveRecvByteBufferAllocator` to reduce memory overhead. Further work involved adding a custom cleanup hook for `PipeChannel` to ensure proper deregistration during half-closes, resolving a critical issue. The user also refactored the `Selector` component, splitting it into separate files for each backend implementation, enhancing code readability and maintainability.
event-drivennon-blockingswiftasynchronous-ionetworking
hassila/swift-nio
Feb 2021 - Apr 2021
Event-driven network application framework for high performance protocol servers & clients, non-blocking.
Contributions:645 pushes, 24 branches in 2 months
event-drivennon-blocking
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