Skip to content
Julien Herr
FR EN
Experience

20+ years building, recovering and hardening systems

An editorial read rather than a raw CV: what I did, in what context, and with what impact.

Today
EV charging · Energy · Product
  • Independent
  • SMEs · startups · EV-charging operators

Independent CTO & Tech Lead

I support SMEs, startups and mobility operators on their critical platforms.

  • Interim CTO / Tech Lead
  • Product & architecture framing
  • Direct contribution to code
Impact · Reliable platforms, delivered with small teams.
EV charging
OCPP · OCPI · CSMS
  • EV-charging / energy operator
  • — TBC
  • CSMS · eMSP · roaming in production

Architect & tech lead

Designing and operating CSMS, eMSP portals and roaming integrations in production.

  • CSMS & eMSP architecture
  • OCPP / OCPI integrations
  • Monitoring & billing
Impact · Several hundred charge points supervised.
Product & legacy
Architecture · DDD
  • Software vendors · product · consultancies
  • — TBC
  • Legacy recovery · delivery structuring

Software architect

Recovering existing platforms and structuring delivery teams.

  • Technical debt reduction
  • Clarifying business flows
  • Getting teams shipping again
Impact · Teams able to deliver once more.
Engineering
Java · Kotlin · TS
  • Multiple contexts
  • 20+ years · critical components · architecture

Hands-on developer

Over 20 years writing production code, from the critical component to the overall architecture.

  • Critical components
  • Quality & maintainability
  • Technical mentoring
Impact · An engineering standard kept intact.