Our Joint Operating system for Seamless EV charging, the brain of a charging station. A flexible and open operating system that finally makes it easy for EV charger manufacturers to comply with ever-evolving industry standards.

The golden standard for seamless charging

Josev stands for Joint Operating system for Seamless EV charging. The clue is in the name: it makes sure that everything is running seamlessly. Josev frees you from the complexity of implementing and testing ever-evolving future-proof communication standards, such as OCPP 2.0.1 and ISO 15118, which comprise hundreds of technical requirements.


We like to think of Josev as the glue between the EV and the CPO

Josev stays in the middle of the action, by interfacing between the EV, the charging station and the CSMS. All so that EV drivers can experience easy and frictionless charging.

With Josev you get a utility belt that will catapult your charging station to the new era of e-mobility, supporting the new and improved OCPP and ISO 15118 standards.

Enables the most user-friendly and secure charging experience for both AC and DC chargers

Second generation ISO 15118, enables vehicle-to-grid, wireless charging, ACD-P , higher data security, and more

Establishes the data link between EV and charger via the charging cable (through PLC via HomePlug Green PHY)

Facilitates future-proof features like built-in ISO 15118 support, plug & play installation, powerful remote control & monitoring

Establishes the data link between EV and charger via wireless communication (based on IEEE 802.11n)

Based on regular interoperability tests, and learnings from our community developers, including CharIN Testivals

We work with you to build a bespoke solution that’s tailored to your specific needs

It’s a process: from a first workshop to define the interface, to integration tests, to delivering the final product. Josev is based on microservices with APIs to facilitate innovative integrations.

We use MQTT as a communication mediator between Josev and the manufacturer’s safety-related code. Together we’ll define a tailored interface that will take care of the communication with the EV (via ISO 15118) and the CSMS (via OCPP 2.0.1), so you don’t have to.

The communication between the EV and the charger is usually a black box for CPOs. If the communication fails for some reason, the CPO has usually no insight as to why it happened.

Josev’s ISO 15118 protocol analyser solves this problem. It logs the ISO 15118 communication between the EV and the charger to enable an in-depth message analysis via a user-friendly cloud-based web interface, including detailed error reporting to enable a more efficient debugging process.

Our own high-performing EXI codec makes sure messages are exchanged between the EV and the charger in the most efficient way - with insightful debugging infos for testers.

As our partner, you are entitled to receive new updates of the OS build that will improve over time, either by reducing its size, spending less resources or by adding features that you need or want to have. Your OS is built to fit your needs.

*only supported by Sara

Seamless Integrations

Take it one step further with Sara

Josev connects with any CSMS running OCPP 2.0.1 and later versions, allowing the smoothest possible operation. A charge point operator (CPO) that counterpart, Sara, can take it one step further and access fine-grained analytics and a detailed view on what’s going on in the ISO 15118 communication, between the EV and the charger.

Discover Sara →Text Link
focus on your USP

Powered by Josev, designed by you

Because Josev is built with flexibility at its core, adding more brain power with additional services and third-party integrations on your hardware is simple. The world gets a better EV charging experience if all developers start with the same bullet-proof foundation. A common starting point eliminates errors, reduces development time, and opens up limitless customisation.


Josev is built to benefit everyone – from manufacturers to operators to drivers

A solution that’s ready-to-go

There’s no need for every charging station manufacturer to reinvent the wheel, so we provide a modular set of software modules that can be integrated more or less off-the-shelf. We take care of ISO 15118 and OCPP conformance testing as part of our long-term support. There is no hardware lock-in, as we’ll support major hardware platforms using Yocto-based Linux builds.

Significant cost savings

Building a system as powerful and reliable as Josev from scratch is a big investment. But choosing Josev means that you’ll significantly save costs in the long run, get to market quicker, and reduce risks to your in-house development and testing. This way you can focus on your core business and USPs.

Strong data security

Both ISO 15118 and OCPP 2.0.1 support digitally signed messages and encrypted data transmission with Transport Layer Security (TLS) 1.2 and higher and strong cipher suites. We even go a step further to make sure that all of Josev undergoes a security audit.

Effortless integration

Maybe you want to add your own smart load balancer or another application that adds significant value to your charger. With Josev’s easy-to-use interface, you can easily integrate these functionalities, whatever the demand.

Calibration law compliant

Germany is one of the first countries across the globe to enforce calibration law regulations (“Eichrecht”) for EV charging infrastructure, and it seems that other countries will follow suit. This is why we ensure that Josev fully complies with these regulations.

Secure over-the-air updates

With Josev, it’s no effort to keep the ISO 15118 and OCPP software stacks up to date. With Josev, our over-the-air (OTA) updates will go hand-in-hand with our continuous conformance and interoperability tests (including the knowledge we gain from CharIN testivals).

We never stop innovating

Josev communication controller

We’re creating our own communication controller that enables PLC (power line communication), display control, NFC payment and more. Josev will be optimised for this hardware architecture. Are you interested in getting together to define the best solutions for our customers?

Text Link
get in touch

See what Josev can do for you

We're currently busy getting Josev ready. Sign up to the newsletter to follow our journey and be the first to know when it's ready to go.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Sara stands for Station Analytics and Remote Administration

Open charge alliance

The Open Charge Alliance is the official body that specifies OCPP 2.0.1 and defines a set of certification profiles. Each profile tests a certain set of functionalities. Depending on the functionality of your charger or CSMS, you might want to certify for either a subset or all of these profiles.


Continuous Integration / Continuous Deployment (CI/CD)


Scotti stands for Simple Compliance Testing Tool for Interoperability.

Efficient XML Interchange (EXI)

Efficient XML Interchange (EXI) is a very compact representation of XML. All ISO 15118 messages are defined in XML. EXI improves serialisation and parsing speed on embedded devices (like an EV and a charging station controller) and allows more efficient use of memory and battery life, compared to standard (textual) XML.

Message Queuing Telemetry Transport (MQTT)

The Message Queuing Telemetry Transport (MQTT) is a lightweight, publish-subscribe network protocol that transports messages between devices.

Charging Station Management System (CSMS)

A Charging Station Management System (CSMS) helps you monitor, maintain, and control your charger network.

Automated Connection Device (ACD)

Automated Connection Device (ACD), a conductive charging concept that doesn't require a person to plug in the charging cable. A first implementation is ACD-P, where 'P' stands for 'pantograph' charging of buses.

Power line communication (PLC)

Power line communication, a communication technology that enables sending data over existing power cables.

Signal Level Attenuation Characterisation (SLAC)

Signal Level Attenuation Characterisation (SLAC) is based on power line communication (specifically HomePlug Green PHY) and is a protocol to establish the data link between the EV and the charging station via the charging cable.

Charge Point Operator (CPO)

Charge Point Operator, the entity monitoring and managing an EV charger network.