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Julien Herr
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Expertise

Three specialities, one cross-cutting skill

I never approach technology for its own sake: every architectural choice serves a business problem, an operational constraint or a reliability concern. First speciality: mastery of the whole EV-charging chain, from the charge point to the usage. Product & architecture is the through-line that ties my three specialities together.

01

E-mobility & energy

From the charge point to the usage: I've built every link in the EV-charging chain, in production.

01

The charge point

Equipment registry, simulation and hardware monitoring.

evsedb — EVSE registryocpp-cp-simulatorawesome-ev-charging
02

Protocols (OCPP & OCPI)

I speak and tool the very protocols that hold the chain together.

OCPP 1.6 / 2.xocpp-toolkitocpi-toolkitocpp-gateway
03

Monitoring / CPO (CSMS)

Operate, monitor, price and bill a fleet of charge points.

SteVe — contributions & deploymentWhite-label CSMSon requestCharge-point & telecom-asset monitoring (modem/SIM)on requestPricing / valorisation engineon requestCRM/ERP integration (Odoo)on request
04

Energy management & smart charging

prototype — exploring

Consumption forecasting and charge optimisation.

Consumption forecastingCharge optimisation
05

Roaming / OCPI

Interoperability and roaming between operators.

ocpi.fyi — reference docsopen-idro-directory — roaming IDsWhite-label OCPI (gateway / cache)on request
06

eMSP / the usage

Driver and fleet-manager side: pay for and use the charge.

Card payment (Stripe) + QR codeon requestSubscription payment siteon requestFleet-manager portalon request
02

Engineering & leadership

The chain above is my build: design, architecture and recovery end to end — from dev to CTO.

Design & architecture
Architecture of the EV platforms & AI agentsConfidential clientDDD · hexagonal · event-drivenLegacy recovery
Leadership
From dev to CTO, via tech leadTeam structuring & handover
03

AI in organisations

I run my own business on agents I build — the best proof that I can put AI to work.

Ops
Multi-cloud homelab agent — monitoring/alerting as IaC (OpenTofu)Confidential client
Dev
Product & tech agents — backlog & featuresConfidential client
Business
Engagement-prospecting pipelineConfidential client
AI-autonomous products
kill-the-newsWishlist
Cross-cutting

Technologies

A proven stack, chosen for robustness and maintainability — cutting across all three specialities, in service of the product.

JavaKotlinSpring BootTypeScriptPHPNuxtNestJSPostgreSQLMySQLMongoDBDockerCloudflareGitHub Actions

Technologies remain secondary to the business problems they solve.

Community & open source

What I carry in public

Beyond client engagements — public, long-standing credibility.

TestNG

Lead

The reference Java testing framework, used by thousands of projects.

Strasbourg JUG

Co-founder · since 2011

The Alsace Java community: meetups and knowledge sharing.

Agile Tour Strasbourg

Co-organiser · since 2011

The region's annual agile conference.

Open source

Contributor

Regular contributions to many projects across the ecosystem.