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Fabien LassagneFL

Fabien Lassagne

Senior Platform Architect | IDP | Rust, Go & K8s

€900/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Fabien

Infrastructure complexity is the new glass ceiling for your velocity.

You hire brilliant engineers to build your product, but they waste 30% of their time context-switching on infra issues. This is not a DevOps problem. It's a Product problem.

With 13 years of experience in software engineering and systems architecture (including 5 years as a Staff Engineer in a 100% English-speaking environment), I help Scale-ups and DeepTech companies transform this operational chaos into a robust Internal Developer Platform (IDP).

My thesis: Infrastructure as Software

I don't just script your infra. I architect it with the same rigor, type safety, and Software Craftsmanship (TDD, Clean Architecture) as your business logic. I assemble industry standards (Kubernetes, GitOps, IaC, Custom Operator) and develop critical tooling in Rust and Go for uncompromising performance and reliability.

How we can collaborate:

1. The IDP Engine (3 to 6-month engagement)
I build your "Golden Path" to reduce developers' cognitive load and automate your delivery.
  • Month 1 (Foundations & Immersion): Deep diagnosis, technical debt mapping, Target Architecture design, and initial setup (K8s/GitOps).
  • Following months (Builder): Iterative platform industrialization, internal portal deployment, and continuous optimization (FinOps/Security).
2. The Platform Guardian (Ad-hoc Expertise)
Surgical interventions on critical distributed systems issues: custom tooling development (Rust/Go), advanced K8s debugging, or supply chain security.

Modalities:

Based in Bordeaux, I primarily work remotely with international clients, with regular trips to Paris for audit phases and strategic rituals.

Let's discuss your industrialization.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km), Bordeaux (up to 20km)

Experience

  • Invariant Systems
    Founder & Principal Platform Architect
    January 2026 - Today (7 months)
    Founded Invariant Systems to bridge the gap between Software Engineering and Platform operations. Acting as Principal Architect to industrialize the infrastructure of Scale-ups and DeepTech companies by treating the "Platform" as a critical product.

    • 𝗧𝗵𝗲 𝗜𝗗𝗣 𝗘𝗻𝗴𝗶𝗻𝗲: Design self-service Internal Developer Platforms (IDPs) (Golden Paths) acting as force multipliers, reducing developer cognitive load and eliminating infrastructure bottlenecks.
    • 𝗧𝗵𝗲 𝗥𝗼𝗮𝗱𝗺𝗮𝗽 𝗔𝘂𝗱𝗶𝘁: Conduct in-depth technical diagnostics and reliability audits to map technical debt and design target architectures for high-growth environments.
    • 𝗧𝗵𝗲 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝗚𝘂𝗮𝗿𝗱𝗶𝗮𝗻: Develop high-performance custom tooling (Rust/Go) and perform surgical interventions on critical stability issues for distributed systems.
  • Ultra
    Staff Platform Engineer & DevOps Lead
    VIDEO GAMES AND ANIMATION
    January 2021 - Today (5 years and 7 months)
    Led the Platform Engineering strategy and managed an international distributed DevOps team for a global, blockchain-based PC game distribution platform. My role extended beyond infrastructure construction to shaping the associated engineering culture.

    • Strategic Leadership: Structuring and mentoring a 100% remote international DevOps team. Defining engineering standards to align distributed squads towards a unified delivery model.
    • Global Deployment: Architecting the GitOps Golden Path for over 50 engineers worldwide, reducing deployment friction on a resilient multi-cloud architecture.
    • Scalability Resilience: Designing a federated observability stack (Prometheus/Thanos) to monitor critical decentralized systems, ensuring high availability for a global user base.
    Platform Engineering Cloud Architecture Kubernetes GitOps Infrastructure as Code
  • Intrinsec
    Senior Infrastructure Engineer
    October 2019 - December 2020 (1 year and 2 months)
    Integrated the core engineering team to industrialize the infrastructure of a Cyber Threat Intelligence (CTI) platform. Focused on hardening the production environment and automating the deployment of distributed services.

    • Infra Hardening: Strengthening the resilience of a distributed architecture relying on message queues, ensuring stability under high load.
    • Deployment Automation: Simplifying the release process by replacing manual operations with reproducible Ansible playbooks and GitLab CI pipelines.
    • Access & Compliance: Implementing policies (IAM, PKI).
    Ansible Distributed Architecture Gitlab CI/CD Automation

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Education

  • Master 2 (M2)
    Université de Pau et des Pays de l'Adours
    2011
    Master 2 (M2)
  • Applied Mathematics Bachelor's Degree
    Université de Pau et des Pays de l'Adours
    2009
    Licence Mathématiques Appliquées

Skill set

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