Sulzer US Employee Directory

Software DevelopmentNew Jersey, United States51-200 Employees

S44 Energy is a premier EV software provider and Charge Station Management System (CSMS) expert, helping charging networks scale with confidence. We are the original authors of CitrineOS, the industry’s leading open-source CSMS, now hosted by Linux Foundation Energy. 

We also developed TopazEV, an Open-as-a-Service (OaaS) CSMS, purpose-built to give Charge Point Operators (CPOs) and eMobility Service Providers (eMSPs) more control and lower costs. To learn more, visit: https://www.topazev.com/

With teams in the U.S. and Germany and over a decade of experience in EV charging software, S44 Energy delivers secure, scalable, and standards-based solutions. We are recognized experts in OCPP and OCPI protocols, ensuring interoperability across EVSE hardware, roaming platforms, and backend systems. Our ISO 27001:2013 certification reflects our commitment to cybersecurity and quality.

Whether you're launching a new EV charging network or upgrading an existing one, S44 Energy provides end-to-end EV charging software solutions—from custom integrations to production-ready CSMS platforms.

Partner with S44 Energy: The software backbone behind the future of EV charging.

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