https://kchasialis.dev/Recent content on Kostas ChasialisHugoen-usSat, 26 Sep 2026 00:00:00 +0000https://kchasialis.dev/blog/async-logger/Sat, 26 Sep 2026 00:00:00 +0000https://kchasialis.dev/blog/async-logger/A single log call can cost thousands of cycles. In this post I discuss where that time goes, and how to move it out of the hot-path.https://kchasialis.dev/about/Mon, 01 Jan 0001 00:00:00 +0000https://kchasialis.dev/about/<p>Throughout my studies, I was always drawn to low-level and systems topics. I wanted to understand the whole execution stack, from high-level concepts such as APIs, system design and abstractions all the way down to computer architecture and what actually happens in the silicon. I especially enjoyed courses such as compiler construction, operating systems, databases, networking and low-level systems programming in C/C++.</p> <p>After my BSc at the University of Athens, I wanted to try research, which led me to the Athena Research Center, where I spent three years as a research associate. I then decided to broaden my knowledge and joined EPFL for an MSc. There I took mostly systems courses, which proved demanding but very rewarding: they let me study these topics in far greater depth. Still, I had never thought much about which career I wanted to pursue. All I knew was that I enjoyed this kind of work, driven purely by curiosity.</p>https://kchasialis.dev/projects/Mon, 01 Jan 0001 00:00:00 +0000https://kchasialis.dev/projects/<h3 id="fastbook--c23--in-progress"><a href="https://github.com/kchasialis/fastbook">fastbook</a> · C++23 · <em>in progress</em></h3> <ul> <li>Designed a low-latency market-data pipeline that reconstructs per-instrument order books; sharded the feed across core-pinned threads via lock-free SPSC queues and used io_uring for network data.</li> <li>Implemented a lock-free, run-based size-class allocator with thread-local caches and huge-page backing, plus object pools, to keep heap allocation off the hot path.</li> </ul> <h3 id="redis-server--rust"><a href="https://github.com/kchasialis/redis-rust">Redis server</a> · Rust</h3> <p>Implemented a Redis server from scratch: strings, lists, streams, transactions, replication, persistence, key expiry, pub/sub and authentication, on an async event loop with Tokio channels and a RESP3 parser.</p>https://kchasialis.dev/resume/Mon, 01 Jan 0001 00:00:00 +0000https://kchasialis.dev/resume/<p><strong><a href="https://kchasialis.dev/cv.pdf">Download the PDF</a></strong></p> <h2 id="education">Education</h2> <p><strong>École Polytechnique Fédérale de Lausanne (EPFL)</strong> — Lausanne, Switzerland MSc Computer Science, Systems specialization, 2023 – 2026 · GPA 5.6/6.0</p> <p><strong>National and Kapodistrian University of Athens</strong> — Athens, Greece BSc Computer Science, 2016 – 2021 · GPA 9.2/10.0</p> <h2 id="experience">Experience</h2> <p><strong>Digital Wave Finance AG</strong> · Software Engineer, Low Latency Trading · Zug · Jul 2026 – present</p> <ul> <li>Develop low-latency, high-throughput exchange connectivity for venues such as Binance: market data ingestion and private streams (order, wallet and order book updates).</li> <li>Optimize the hot path through profiling and benchmarking: minimize cache misses, cross-core communication, data sharing and thread contention, and speed up packet parsing.</li> </ul> <p><strong>Oracle — MySQL HeatWave</strong> · Software Engineer Intern · Zürich · Feb – Aug 2025</p>