Hello, I'm

Julien REO

Lead Backend Engineer — DevOps & Security

Julien REO
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01 — About

Background

Lead Backend Engineer with 10 years of experience designing scalable systems, notably in advertising, web analytics, sports and video.

I design back-end architectures and lead infrastructure, DevOps and security. I recently completed the redesign of a platform whose architecture could no longer onboard new clients with confidence. I reworked its APIs, database, video processing pipeline and infrastructure to overcome its limitations in scalability, reliability and access management.

I favor mature, production-proven technologies to build systems that are reliable, scalable and easy to maintain.

Before moving into engineering, I spent nearly ten years in international business development across Europe and Latin America. It left me with the habit of connecting every technical choice to business goals and customer needs.

I particularly enjoy small, close-knit teams, where autonomy and technical rigor take precedence over heavy processes, and where I can commit for the long term.

Name
Julien REO
Age
41 years old
Location
Biarritz, France
Languages
French, English, Spanish
Focus
Backend · DevOps · Security
02 — Expertise

What I do

Backend Engineering

Designing APIs, microservices and event-driven architectures for data-intensive systems built to last.

Node.js System Design Microservices Message Queues ETL Data Modeling PostgreSQL

Cloud & DevOps

Building resilient cloud infrastructures with automated deployments and monitoring.

AWS Docker Kubernetes Terraform Ansible CI/CD Linux Monitoring

Security

Integrating security best practices, from code to infrastructure, to compliance certifications.

Access Control Secrets Management Infrastructure Hardening Security Audit
03 — Journey

Career path

2021 — 2026
Lead Backend Engineer
AI Video & Sports Platforms
Led backend architecture and DevOps across two lead roles: breaking down monolithic systems into microservices, redesigning data ingestion and processing pipelines, and modeling data across PostgreSQL and Elasticsearch. Migrated infrastructure to AWS with Docker and Terraform, drove zero-downtime migrations off legacy systems, and strengthened security (access control, infrastructure hardening) to meet industry compliance requirements. Mentored developers, conducted code reviews, and defined quality standards within the team.
2017 — 2021
Backend Engineer
Advertising, Digital Marketing, Analytics & Sports
Built backend systems across advertising, digital marketing, analytics, and sports media: designing microservices architectures, moving a PHP backend to Node.js, modeling data across MySQL, MongoDB, and PostgreSQL, designing APIs, and taking first steps in DevOps with Docker, Kubernetes, and Ansible.
2010 — 2017
International Business Development
Digital Marketing & Gamification
Led market entry and business development across Europe and Latin America: building partnerships, acquiring clients, and adapting go-to-market approaches to each sector.
04 — Contact

Let's connect

Happy to discuss projects or connect with fellow engineers.

Connect on LinkedIn