De Xavier
Performance Infrastructure at Rossel & others
Brussels, Brussels-Capital, Belgium
Summary
👤
Senior🎓
Top SchoolDe Xavier is a performance and infrastructure engineer based in Brussels with 18 years’ experience tuning high-volume systems, databases and email platforms. He currently leads efforts at Qualifio to modernize and harden infrastructure for higher uptime and evolvability, and has run performance engagements and DBA work for clients including Rossel, AppTweak and others. He built and scaled Nxmailer into a multi-million-mails-per-day service and contributes pragmatic low-level fixes in open-source—evidenced by optimizations to the widely used Swift Mailer library that reduced needless CPU cycles and improved stream robustness. Known for chasing efficient software while acknowledging the trade-offs that hide latent weaknesses (like I/O latency), he combines deep troubleshooting with long-term capacity planning and monitoring expertise. Colleagues rely on him to turn messy performance problems into measurable, sustainable improvements.
18 years of coding experience
15 years of employment as a software developer
Bachelor's degree, ICT, Bachelor's degree, ICT at Institut d'enseignement Supérieur de NamurInstitut Saint Albert
English, French, Dutch
Github Skills (9)
e-mail10
php10
mailer10
sendmail10
encoding10
send-email10
performance-optimization9
character-encoding9
file-handling9
Programming languages (11)
Github contributions (5)
swiftmailer/swiftmailer
Jan 2009 - Mar 2015
Comprehensive mailing tools for PHP
Role in this project:
Back-end Developer
Back-end DeveloperContributions:46 commits, 4 PRs, 130 comments in 6 years 3 months
Contributions summary:De primarily focused on optimizing the Swift Mailer library's core encoding and character handling functionalities. Their commits reveal efforts to avoid unnecessary function calls (like `strlen`) to improve CPU cycle efficiency, directly impacting performance. The user also made changes to improve the robustness of the library by incorporating improvements to the handling of character streams and fixing potential issues related to file manipulation within the file spool.
mailhogmailerphpemailemails
xdecock/vmod-modsecurity
Jun 2019 - Nov 2022
Varnish Binding for modsecurity
Contributions:1 release, 51 commits, 3 PRs in 3 years 5 months
varnishmodsecuritybinding
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