Maroussia Arnault

I'm a Software Engineer specialized in backend development and production AI agents. Security is part of how I build, not a separate add-on. I build the thing, and I make sure I understand why it's built that way.

I'm currently lead backend engineer and Security Champion at Mercedes-Benz Tech Innovation, for over 4 years, on large-scale systems. Before that, I was a technical consultant for the Volkswagen Group.

🛠️ Technical, what I build:

- Backend services in Java/Spring Boot, Node.js/TS, REST and GraphQL APIs

- Production AI agents (Google ADK, Spring AI), LLM-agnostic, deployed as REST API and SSE-streaming chat

- MCP servers wrapping existing APIs as AI-usable tools

- Observability and incident response: Grafana, Prometheus, Datadog, PagerDuty

- Kubernetes (k9s) and CI/CD (GitHub Actions)

- AI coding agents (OpenCode, Copilot, MCP tooling) in my daily workflow

🔐 Security, built in, not bolted on:

As Security Champion, I run the operational side of product security day to day. Vulnerability scanning and triage with BlackDuck, Polaris, and Gitleaks. Access management and data classification. Hardening documentation and coordinating external pentests. I keep the security posture current. I'm not a GRC auditor. I make sure the technical controls behind NIS2, ISO 27001, and OWASP actually exist and work.

💡 Why work with me:

Dual master's in Management and IT Strategic Management. I move between engineering detail and the business "why" without losing either. I map the architecture so it's clear to engineers and stakeholders alike. Partly because clients need it, partly because I need it myself, to build the right thing.

🌍Trillingual French, English, German. Currently full-time at Mercedes-Benz Tech Innovation, so available 1 day per week now. Capacity for larger engagements depending on timeline and notice.