Senior R&D Developer

David Guerizec

Building software since 1995. From real-time 3D engines for the Olympics to secure gateways and modern streaming infrastructure. I craft robust solutions across the full stack, from bare metal to cloud.

[email protected] Nantes, France
01

Expertise

Languages

  • C++
  • C
  • Python
  • TypeScript
  • Bash
  • Lua

Systems

  • Linux
  • Docker
  • Microservices
  • Real-time

Domains

  • Backend
  • Security
  • IoT
  • Streaming
  • Tooling

Data

  • PostgreSQL
  • Redis
  • MongoDB
02

Selected Experience

2022 — 2025
Sparkup
R&D Developer

Built a video stream load balancer and proxy between LiveKit servers and virtual audience software. Developed real-time multilingual transcription using Deepgram and OpenAI.

2020 — 2022
Viavi-Expandium
Backend Developer

Developed a peer-to-peer communication bus for a microservices cluster architecture.

2018 — 2020
Oxopus
Founder

Founded a digital fabrication company. Designed and developed a complete CNC machine including software and mechanical engineering.

2016 — 2018
Lugos
Embedded Developer

Development of a monitoring stack (capture, processing, alerting) in C++ and JavaScript on mini-PC.

2014 — 2016
IDCWARE
Lead Developer

Led the redesign of real-time financial flow monitoring software.

2013 — 2014
Freelance
Security Consultant

SSL development for a cloud platform. Security audits and physical penetration testing.

2007 — 2013
Orange Portails
Security Engineer

Security unit responsibilities including monitoring, audits, incident management, and internal security training programs.

2004 — 2007
Wallix
Security Developer

Developed secure gateways for Total subsidiaries: web proxy, mail, firewall, VPN, and DNS infrastructure.

2000 — 2004
Aurora
Web Developer

Web development for ameli.fr (French national health insurance). Ported Midgard CMS from PHP3 to PHP4.

1999 — 2000
Avence
Network & Web Developer

Network administration and web development in PHP/C on Midgard CMS.

1997 — 1998
Crédit Lyonnais
Developer

Development of banking applications in COBOL.

1996 — 1997
Gendarmerie Nationale
Developer

Development of traffic radar calibration software.

1995 — 1996
C&I
3D Developer

Real-time 3D engine for America's Cup 95 and virtual cameras for the Atlanta 96 Olympics broadcast.

03

Notable Projects

2025
olexai.fr

AI-powered legal assistant for French law.

2007
SSHProxy

Open-source SSH proxy gateway for secure access management.

2018 — 2020
CNC Machine

Complete design and development of a CNC machine — software, electronics, and mechanical engineering.

Ongoing
IoT & Robotics

Personal projects in full-stack IoT development: software, electronics, and enclosure design.