2017 - 2020   Télécom Nancy, Nancy, France: MSc CS, specializing in Software Engineering

Masters of Science in Computer Science, covering 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

2019   Twitter-like service: specified a communication protocol (team of 2 people, 3 months)

• Developed a client and a server according to the specification

✓   Network system calls, SQLite in C while preventing SQL injections

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

2017   Film recommendation system: desktop GUI to obtain film recommendations (team of 3 people, 3 months)

• Generated recommendations based on the history of all users, with a matrix factorization algorithm
• Integrated it with the GUI and a film database file

✓   GNU Scientific Library in C

Sept. 2020 - Now   Software Engineer, Cloudflare, London & Remote: Denial of Service (DoS) team

• Main responsabilities: maintaining and improving automated mitigation systems
• Worked from home (part of the time), took oncall shifts

• Worked on a new system to collect packets and display analytics to customer (samplerd)
• Hand-optimized eBPF assembly
• Extended and automated data extraction for public reports like “Network-layer DDoS attack trends for Q4 2020”

✓   eBPF, XDP, Docker, TCP, UDP, dos attacks, clickhouse

Mar. - Aug. 2020   Software Developer Intern, Cloudflare, London & Remote: Denial of Service (DoS) team

• Aim: benchmark, develop and compare various performance optimizations in l4drop, a DoS mitigation system
• Worked from home almost from the beginning
• Presented the methodology and results at the Linux Plumbers Conference and in my master thesis

✓   eBPF, XDP, TCP, kernel probes

Jun. - Aug. 2019   Software Developer Intern, SnT, Luxembourg: Interdisciplinary Center for Security, Reliability and Trust (SnT), a research lab of the University of Luxembourg. securityandtrust.lu

• Aim: explore performance analysis technics with eBPF (extended Berkeley Packet Filter)
• Wrote IP-whitelisting tool using XDP for DDoS protection of a Ripple blockchain connector
• Extended Vector monitoring tool with additional eBPF modules : packet analysis (HTTP & WebSocket, UDP & DTLS), garbage collector visualization for NodeJS using USDT probes
• Co-authored a research paper outlining innovative performance monitoring schemes
• Worked in English on a daily basis.

✓   eBPF at different levels, Docker, Python, Go, TCP, UDP, Websocket

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 of a submitted article): The Rise of eBPF for Non-Intrusive Performance Monitoring

2019   Into-Ledger: fork of an importer/classifier of financial transactions from a file in the CSV format

• The fork improves data collection to make better use of the Bayesian Filtering method

✓   Go, Bayesian Filtering

2019 - 2021   Sesters: tool to extract price tags from plain text, for conversion from one currency to another

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

2014 - present   Open-source contributions: please see github.com/cljoly for more details