Manos Seferidis
Founder at Prefractal
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolManos Seferidis is a pragmatic software engineer and founder with 12 years of experience building robust backend systems, data tooling, and high-performance distributed applications across startups and enterprises in London. He currently leads Prefractal to democratise institutional trading while running contracting work through Alpaca Software, bringing a strong bias for quality from roles at Mercedes-Benz, OpenSignal, Mixcloud and a stint on real-time volumetric streaming. A meticulous QA and test automation advocate, he has hardened projects like a pure-Python websocket server and an ANSI C thread-pool with faster, more reliable test suites and refactors that improve maintainability under load. Comfortable across low-level C and high-level Python, he also resolves deployment and CI/CD pain points in cloud environments and mentors junior engineers. Not obvious from job titles: he repeatedly turns ad-hoc research or legacy code into production-grade systems, often by adding disciplined testing and pragmatic tooling.
12 years of coding experience
4 years of employment as a software developer
Technical high school Computer Science & Networks, Technical high school Computer Science & Networks at 1st Technical High School of NeapoliBusiness dexterity & Computer Science, Business dexterity & Computer Science at Summer classesBachelor (unfinished) Computer Science, Bachelor (unfinished) Computer Science at Umeå UniversityBachelor (unfinished) Computer Science, Bachelor (unfinished) Computer Science at Linköping University
English, Swedish, Greek
Github Skills (19)
socket-io10
pytest10
python10
scripting10
testing10
thread-pool10
websocket10
c1110
performance-testing10
c1710
script10
socket10
valgrind10
sh10
shell10
Programming languages (14)
Github contributions (5)
Pithikos/python-websocket-server
May 2016 - Jan 2022
A simple fully working websocket-server in Python with no external dependencies
Role in this project:
Back-end & QA Engineer
Back-end & QA EngineerContributions:5 reviews, 139 commits, 27 PRs in 5 years 9 months
Contributions summary:Manos primarily focused on improving the functionality and reliability of the Python-based websocket server. They implemented and automated comprehensive tests using the pytest framework to validate message handling, connection behavior, and handshake processes. Furthermore, the user addressed critical aspects such as connection management and error handling, ensuring the server's robustness. They also refactored the code for improved maintainability.
pythonwebsocket
Pithikos/C-Thread-Pool
Jan 2016 - Jan 2023
A minimal but powerful thread pool in ANSI C
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:4 reviews, 45 commits, 59 PRs in 7 years 1 month
Contributions summary:Manos primarily focused on improving the testing infrastructure and efficiency of the thread pool library. Their commits involved optimizing the memory leak tests, reducing test execution time, and introducing parallel execution where possible. They also modified the test suite to address potential false negatives and fine-tuned the parallelization to ensure stability under heavy thread loads. This suggests a strong emphasis on quality assurance and performance testing within the project.
ansi-cthread-pool
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