ENGINEERING & SECURITY LEADER · LILLE, FRANCE
Valentin Druon.
Build.Scale.Secure.
I run product, engineering and security at Nestor, where some 60 organisations in banking, finance, retail and law exchange confidential files: 8,000 users, 10,000 secure spaces, 400 GB. I also take a few freelance missions a year.
The platform I run today
Hover a layerTap a layer
About 60 organisations in banking, finance, retail and law. Close to 8,000 admins and guests, 10,000 secure spaces.One Next.js application per surface, a shared design system, six interface languages.NestJS APIs and workers for campaigns, signatures, exports and reminders. E-signature, video conferencing and document generation plug in here.PostgreSQL 16 as the source of truth, Redis for queues, S3 object storage holding some 400 GB of confidential files.Kubernetes deployed with Helm and ArgoCD, infrastructure in Terraform, a delivery pipeline cut from about fifty minutes to sixteen.Keycloak with per-organisation branding, enterprise SSO over OIDC and SAML, passkeys on the way.ISO 27001 certification led in 2026, a white-box penetration test and its remediation programme, security governance that the team runs day to day.In short
I’m Valentin. I have spent ten years building software for industries where a mistake costs more than a bad quarter: real-estate investment, then compliance and confidential exchanges. I started in the code and still read it. What I care about is the same as it was at the start: a product people rely on, a team that owns it, and a security posture that holds when someone actually checks.
Trusted in
Sectors where confidentiality is not a feature but the job.
- Banking01
- Finance02
- Retail03
- Law04
At a glance
- Experience
- 10+ years
- Current role
- CTPO & CISO, Nestor
- Team
- 10 people, 4 in tech
- Certification
- ISO 27001, led in 2026
- Platform in production
- 60 clients · 8k users · 400 GB of confidential files
- Based in
- Lille, France--:--
- Languages
- French · English
How I can help
Four ways to work together, as a fractional executive or on a one-off engagement.
- Fractional CISOSecurity governance and certification without a full-time hire.
- Fractional CTOTechnical leadership for founders who need a CTO before they can hire one.
- Tech & security auditAn honest picture of a codebase, an architecture and its risks.
- Product strategy & developmentTurning an idea or a customer need into a product people use.
Career
Ten years building products, then leading the teams that build them.
Get in touch
Tell me where your product or team is stuck. A thirty-minute call is enough to know whether I can help.