Xavier Petit · Developer, DevOps, Sysadmin

Skills

Software

Sysadmin

Experiences

Developer @Upfluence (2023-09 .. )

Developing Go libraries and micro-services (connected to Stripe & Amazon Ads APIs) in a scaleup company.

Kubernetes, AWS, Thrift, lots of in-house code & tools.

Developer (2022-11 .. 2023-08)

Various personal projects:

• Undetectable Web automation (using a real/stock unmodified browser)
• Job board aggregator (with deduplication of similar ads)
• Scanning of all registered domain names (262 million) in 10 minutes for ~$20
• High performance ZIM file reader (indexing a full english Wikipedia archive: ~55 GB in under a minute on a MacBook)

Developer @Leboncoin (2022-02 .. 2022-09)

• Micro-service development in Go. With Kubernetes, Kibana, etc
• Golang best practices
• Development of scripts & tools to help with development

Developer @01-edu (2018-10 .. 2021-11)

• Created and documented an automated test system with Docker to run untrusted code
• Configured Traefik and replaced it with a service that listens to Docker events and changes Caddy configuration
• Created a private, custom Docker registry that automatically builds and mirrors images
• Wrote and reviewed educational content (subjects and automated tests) to learn Shell scripting and Go
• Created deployment scripts
• Wrote documentation and scripts to install and configure Windows 10 with everything needed to code
• Management of servers (sysadmin)
• Created and documented an ephemeral (readonly) version of Ubuntu for schools (with a USB key for data persistence)
• I conducted technical interviews

Developer @Adeo (2018-04 .. 2018-10)

• I developed libraries, wrappers and REST APIs using Python with Flask, Requests, pytest, SQLAlchemy & Alembic libraries to:
  • Automate tedious network operations for F5 load balancers
  • Automate network filtering rules qualification
  • Manage network addresses and security groups before creating firewall rules (Palo Alto)
• I created and led Python programming workshops for reskilling
• I conducted technical interviews

Teaching @Freelance (2018-01 .. 2018-04)

• Programming courses (Ada, C, Lua, JavaScript) for college students, engineering school students, freelancers...

Sysadmin @NaN (2017-09 .. 2017-12)

• Installation of an open-source programming school in Abidjan (Côte d’Ivoire)
• Deployment of 50 iMacs on Linux Debian (preseed) in triple-boot Linux, macOS and Windows (macOS & Windows UEFI entries disabled by default)
• KVM-based virtual server (DHCP, DNS, NTP, SSH, etc)
• Creation of the login system and centralized authentication (SSO)
• Efficient incremental synchronization (difference of snapshots), periodic (every 5mins) of each student's user directories with the server

Sysadmin @Thot (2017-09 .. 2017-12)

• Deployment of a Gogs forge
• Development of a KISS CI (Continuous Integration) script through Git Hooks to manage the micro-services configured with environment variables
• Updating, restarting and stopping, both manual and automatic (on crash or each specific git branch push)

Sysadmin @Becoast (2015 .. 2016)

• Management of dedicated Xen servers and their associated VMs (under Debian)
• Self-hosted DNS management (custom through GLUE records)
• Thin provisioning with ZFS on Linux
• Installation of a secure mail server complying with anti-spam best practices (SPF, DKIM, DMARC)
• Deployment:
• Webmail (Roundcube, then Rainloop)
• GitLab forge
• Monitoring with Netdata
• Collaborative communication platform: Mattermost (Slack alternative)
• File hosting system: Seafile (Dropbox alternative)

Sysadmin, Developer @Freelance (2013 .. 2017)

• Development: real-time backup for Windows
• Development: file deduplication
• Development: Data recovery from faulty disks and corrupted file systems with Testdisk suite and custom disk cloning programs (dichotomous traversal of intact portions of the disk)
• Development: multi-platform games with SDL (with a custom Ada binding), one-time pad (Vernam cipher)
• Assembly, installation and maintenance of computers (Windows XP and 7 Pro), servers (GNU/Linux), routers...
• Recovery of customer accounts from the ERP database
• Setting up a newsletter (phpList) and importing customers
• Virtualization under Xen of Windows Server with direct access to a network card (PCI passthrough)
• Simplification of the SI architecture
• Writing a Windows 10 installation and tweaking tutorial

Sysadmin @SR Infosystèmes (2008 .. 2012)

• Migration of a VMware disk image (VMDK) to Xen (with paravirtualized drivers)
• Immortal virtual machine with Xen, Remus & DRBD (manually patched and recompiled)
• Benchmarking for the implementation of a SAN: iSCSI, AoE and NBD
• Optimization of the ext4 file system on RAID (stride, stripe-width, no lazy init)
• Network cabling (RJ45 crimping, wiring closet, labelling, etc.), troubleshooting, installation, server and workstation optimization.
• First use of reverse SSH on port 443 (to bypass NAT, Firewalls...)

Sysadmin @Jacuru (2006)

• Installing a Samba NAS with RAID 1 (mdadm) encrypted (dm-crypt) disks, the spare disks are sleeping and woken up if necessary.
• Admin account password cracking with John the Ripper

Education

42, Google, Wikipedia, man, specs

Hobbies, interests

Chess, hiking, all things tech related, space, nature