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<!DOCTYPE html>
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<title>Alex Xu's Resume</title>
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<meta name="description" content="Generalist software developer with experience in Linux, C, Python, networking.">
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<body>
<div class="right title">
<h1>Alex Xu</h1>
</div>
<div class="left taddr">
<address>
<ul class="fakelist">
<li>
<svg class="icon" role="img" height="12" width="12" fill="none" stroke="currentcolor" stroke-linejoin="round" stroke-width="1.1">
<title>Location:</title>
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Toronto, Canada<br>(open to remote, reloc)
</li>
<li>
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<title>Email:</title>
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<a href="javascript:location=['ca','.','alxu','@','alex',':','mailto'].reverse().join('');void 0">
<span style="display:inline">alex</span>@alxu<span class="hide"> DELETE ME </span>.ca
</a>
</li>
</ul>
</address>
</div>
<div class="gap"></div>
<h2 class="left">Education</h2>
<div class="right">
<section class="entry">
<div class="entry-header">
<div><h4><b>Lassonde School of Engineering, B.Sc., <abbr title="Honours">Hons.</abbr> Computer Science</b>, <i class="nb">York University</i>, GPA: 7.7/9.0 (A).</h4></div>
<div class="date"><b>Sept. 2016–May 2020</b><span class="date-punct">:</span></div>
</div>
<ul class="left-heavy-columns">
<li>Advanced Object Oriented Programming (A+)</li>
<li>Design and Analysis of Algorithms (A+)</li>
<li>Fundamentals of Data Structures (A+)</li>
<li>Computer Architecture (A)</li>
<li>Database Management Systems (A+)</li>
<li>Applied Cryptography (A+)</li>
<li>Mathematics of Cryptography (A)</li>
<li>Network Security (A+)</li>
</ul>
<ul class="print" style="width:21em">
<li>Advanced Object Oriented Programming (A+)</li>
<li>Design and Analysis of Algorithms (A+)</li>
<li>Fundamentals of Data Structures (A+)</li>
<li>Computer Architecture (A)</li>
</ul>
<ul class="print" style="width:16em">
<li>Database Management Systems (A+)</li>
<li>Applied Cryptography (A+)</li>
<li>Mathematics of Cryptography (A)</li>
<li>Network Security (A+)</li>
</ul>
</section>
</div>
<div class="gap"></div>
<h2 class="left">Work</h2>
<div class="right">
<section class="entry">
<div class="entry-header">
<div><h4><b>Ethica Channel Enablement Inc</b>, <i>Network Engineer</i>.</h4></div>
<div class="date"><b>Dec. 2018–Oct. 2019</b><span class="date-punct">:</span></div>
</div>
<p>Developed several core projects and provided extensive consulting on C, Linux, git, and networking.</p>
<ul>
<li>built a Buildroot-based minimal Linux infrastructure for the launch of a multi-link VPN product</li>
<li>created a fully automated high-speed operating system installer for x86 systems using BusyBox sh</li>
<li>created a tool for remote Linux in-place replacement using POSIX sh and BusyBox</li>
<li>developed a GitLab CI process for generating the deployable image</li>
</ul>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b>York University</b>, <i>Undergraduate Student Research Award researcher</i>.</h4></div>
<div class="date"><b>May–Aug. 2018</b><span class="date-punct">:</span></div>
</div>
<p>Co-developed a Django web platform for worldwide crowdsourced hydrographic data collaboration.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b>York University</b>, <i>Teaching assistant</i>.</h4></div>
<div class="date"><b>June–July 2017</b><span class="date-punct">:</span></div>
</div>
<p>Taught lab sessions for 48-student Android/web development course.</p>
</section>
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<div class="gap"></div>
<div class="left">
<h2>Community</h2>
<address>
<ul class="fakelist">
<li>
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<title>cgit:</title>
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<a href="https://cgit.alxu.ca/">cgit.alxu.ca</a>
</li>
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<title>GitHub:</title>
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<a href="https://github.com/Hello71">@Hello71</a> <span style="font-style: normal">[</span><a href="https://github.com/search?q=type%3Apr+author%3AHello71&s=created">PRs</a><span style="font-style: normal">]</span>
</li>
<li>
<svg class="icon" role="img" width="15" height="16" fill="none">
<title>The Mail Archive:</title>
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<a href="https://www.mail-archive.com/search?a=1&l=all&from=alex+xu+(hello71)&o=newest">Alex Xu</a>
</li>
<li>
marc:
<a href="https://marc.info/?a=145271750200002">Alex Xu</a>
</li>
</ul>
</address>
</div>
<div class="right">
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://alpinelinux.org/">Alpine Linux</a></b></h4></div>
<div class="date"><b>March 2020–present</b><span class="date-punct">:</span></div>
</div>
<p><a href="https://gitlab.alpinelinux.org/groups/alpine/-/issues?state=all&author_username=alxu">Reported</a>, documented, and <a href="https://gitlab.alpinelinux.org/groups/alpine/-/merge_requests?author_username=alxu&state=all">contributed fixes</a> for issues including <a href="https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.14.0#faccessat2">Operation not permitted in Docker</a>, <a href="https://github.com/alpinelinux/docker-alpine/issues/134">sh: write error: Invalid argument</a>, and <a href="https://gitlab.alpinelinux.org/alpine/aports/-/issues/12368">Raspberry Pi doesn't boot, 7 blinks</a>. <a href="https://lists.alpinelinux.org/~alpine/devel/?search=from%3A%22Alex+Xu%22">Proposed changes</a> including <a href="https://lists.alpinelinux.org/~alpine/devel/%3C1628515011.zujvcn248v.none%40localhost%3E">-fno-plt for x86 and x86_64</a>, <a href="https://lists.alpinelinux.org/~alpine/devel/%3C1593702164.2nw55qdomr.none%40localhost%3E">compressing debuginfo</a>, and <a href="https://lists.alpinelinux.org/~alpine/devel/%3C1593625212.dirkptm3b0.none%40localhost%3E">reconsidering -Os</a>.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://gitlab.freedesktop.org/glvnd/libglvnd">libglvnd</a></b></h4></div>
<div class="date"><b>September 2021</b><span class="date-punct">:</span></div>
</div>
<p><a href="https://gitlab.freedesktop.org/glvnd/libglvnd/-/merge_requests/249">Implemented correct global-dynamic TLS support, fixing musl compatibility.</a></p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://www.winehq.org/">Wine</a></b></h4></div>
<div class="date"><b>July 2021</b><span class="date-punct">:</span></div>
</div>
<p><a href="https://www.winehq.org/pipermail/wine-devel/2021-July/191267.html">Implemented copy_file_range support, shrinking Wine prefixes from 200 MB to less than 1 MB.</a></p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b>Linux kernel</b></h4></div>
<div class="date"><b>2012–present</b><span class="date-punct">:</span></div>
</div>
<p>Reported issues and submitted fixes: <a href="https://lore.kernel.org/lkml/?q=f%3A%22Alex+Xu%22">lkml</a>, <a href="https://linuxlists.cc/profile/47355/Alex_Xu">linuxlists</a>. Diagnosed <a href="https://github.com/rust-lang/cargo/issues/9739">Cargo issue 9739</a> to <a href="https://lore.kernel.org/lkml/1628086770.5rn8p04n6j.none@localhost/">a long-standing kernel bug</a>, and <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=46c4c9d1beb7f5b4cec4dd90e7728720583ee348">fixed the underlying issue</a>, resolving a deadlock in GNU Make and similar jobservers.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://qemu.org/">QEMU</a></b></h4></div>
<div class="date"><b>December 2020</b><span class="date-punct">:</span></div>
</div>
<p>Discovered and reported <a href="https://nvd.nist.gov/vuln/detail/CVE-2020-35517">an issue allowing full host device access from guests with virtiofsd enabled</a>.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://cgit.alxu.ca/wfs.git/">wfs</a></b></h4></div>
<div class="date"><b>June 2020</b><span class="date-punct">:</span></div>
</div>
<p>Built a concurrent Python web font subsetter with automatic pixel-perfect verification.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://cgit.alxu.ca/cgit-syntax-highlighting.git">cgit-syntax-highlighting</a></b></h4></div>
<div class="date"><b>March 2020</b><span class="date-punct">:</span></div>
</div>
<p>Built a concurrent Python pygments microservice, reducing TTFB from 1.1s to 0.15s on <a href="https://cgit.alxu.ca/">cgit.alxu.ca</a>. Improved portability and security and reduced LOC by 66% by <a href="https://cgit.alxu.ca/cgit-syntax-highlighting.git/commit/?id=bbbbafd21b1cade042d57c90cc70df682df28e6d">switching from http.server to aiohttp</a>.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://cgit.alxu.ca/udpastcp.git">udpastcp</a></b></h4></div>
<div class="date"><b>July 2016</b><span class="date-punct">:</span></div>
</div>
<p>Built a C tunnel to simulate datagrams using TCP packets, fixing TCP-over-TCP overhead.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://github.com/Dwarf-Therapist/Dwarf-Therapist">Dwarf Therapist</a></b></h4></div>
<div class="date"><b>Aug. 2014–Sept. 2017</b><span class="date-punct">:</span></div>
</div>
<p><a href="https://github.com/Dwarf-Therapist/Dwarf-Therapist/commits?author=Hello71">Implemented cross-bit ptrace, migrated from qmake to CMake, and refactored C++ code</a>.</p>
</section>
<section class="entry">
<div class="entry-header">
<div><h4><b><a href="https://sourceforge.net/projects/simpregedit/">Simple Registry Editor</a></b></h4></div>
<div class="date"><b>Sept. 2008</b><span class="date-punct">:</span></div>
</div>
<p>Built a minimal .NET registry editor.</p>
</section>
</div>
<div class="gap"></div>
<h2 class="left" style="font-size: 1.4em">Skills</h2>
<div class="right">
<p>Alpine, Debian Linux; FreeBSD; Docker; Git; NGINX; WireGuard; TCP/IP; HTTP(S); DNS; SSH</p>
</div>
<h3 class="left">Programming</h3>
<div class="right">
<p>C; C++; Go; Python; bash, POSIX sh; GNU make; HTML; CSS; JavaScript; SQL</p>
</div>
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