Detail-oriented and self-motivated Software Engineer based in London, interested in performance optimization. Proficient in particular in Rust, Go, C and eBPF.

Employment

Sep. 2020 - Jun. 2022   Software Engineer, Cloudflare, London (Work from Home & Office): Distributed Denial of Service (DDoS) protection team

  • Responsibilities: maintain and improve automated mitigation systems against DoS attacks, answer customer queries
  • Redesigned with a colleague the data pipeline to display network analytics to customers. It involved mainly data extraction using eBPF, efficient and performant storage in ClickHouse and a public facing GraphQL API
  • Extended and automated data extraction for public reports like “Network-layer DDoS attack trends for Q4 2020”
  • Hand-optimized eBPF assembly, C code, ClickHouse tables and materialized views

✓   C, eBPF, XDP, Rust, Go, Docker, TCP, UDP, dos attacks, ClickHouse, GraphQL

Mar. - Aug. 2020   Software Developer Intern, Cloudflare, London (Work from Home): Denial of Service (DoS) team

✓   eBPF, XDP, TCP, kernel probes

Talks & Papers

Aug. 2020   Linux Plumbers Conference 2020 (talk & paper): Evaluation of Tail Call Costs in eBPF

Aug. 2020   Master Thesis: Impact of Indirect Calls within eBPF and Changes to Reduce this Impact

Aug. 2019   NOMS 2020 Conference (co-author): The Rise of eBPF for Non-Intrusive Performance Monitoring

Education

2017 - 2020   Télécom Nancy, Nancy, France: Masters of Science in Computer Science, focused on software engineering and project management

2015 - 2017   Lycée A. Fournier, Bourges, France: two-year course equiv. to a BSc in Mathematics and Physics

Preparation for the highly competitive nationwide entrance exams for French Grandes Écoles

Selected School Projects

2018 - 2019   Full compiler: Tiger language (team of 4 people, 6 months)

  • Wrote a grammar for the language with ANTLR, constructed the abstract syntax tree (AST)
  • Did semantic analysis on the AST, generated assembly code (function, loops, conditional branches)

✓   Java, ANTLR, formal language theory

Skills

Working knowledge

Rust, C, Go, SQL (ClickHouse, SQLite), Python, Docker, Linux, Jira, Gitlab

Basic knowledge

Lua, Java, HTML/CSS/JavaScript,
OCaml, key-value database (LMDB)

Languages

English (TOEIC 935, full professional proficiency) • French (native) • German

Selected Personal Software Projects

2019 - 2022   Rusqlite Migration: database schema migration library for rusqlite, written with performance in mind

✓   Rust (noteworthy package used: lazy_static, rusqlite), SQLite

2018 - 2022   Sesters: tool to extract price tags from plain text, for conversion from one currency to another

✓   Rust (noteworthy package used: serde, clap, reqwest, rusqlite), SQLite, Web API

2014 - Now   Misc. Open-Source Contributions: please visit my website at joly.pw/open-source for a full list

Interests

Sports: Judo in team, Climbing, Yoga

Reading: novels, non-fiction (press, books)