EV Charging Software, Built on Open Standards - Delivered with Real-World Expertise
S44 Energy builds and operates EV charging software using open standards and open-source foundations, combining production-tested platforms with hands-on implementation expertise.
EV Charging is what we do. All we do.
S44 Energy is both a software provider and a custom engineering partner for the global EV charging ecosystem. We design, build, and operate charging platforms used by real networks in production—not just prototypes or demos.
At the core of our work is CitrineOS, the open-source CSMS foundation originally created by our team and now hosted by Linux Foundation Energy. We pair that foundation with real-world deployment experience to deliver software that scales with your business.
At the core of our work is CitrineOS, the open-source CSMS foundation originally created by our team and now hosted by Linux Foundation Energy. We pair that foundation with real-world deployment experience to deliver software that scales with your business.
Solutions Built for Control, Flexibility, and Scale
Software and Services Built for Every Stage of Growth
We support EV charging operators through multiple paths—without forcing a single platform or business model.
CitrineOS - An open-source CSMS foundation designed around open standards like OCPP, OCPI, and ISO 15118. CitrineOS powers many of our production deployments and serves as the extensible core for custom platforms.
Custom Software & Professional Services - For organizations ready to differentiate, we build proprietary features, integrations, and workflows on top of CitrineOS—giving you ownership of your software, your roadmap, and your IP.
TopazEV
For teams not yet ready to invest in a custom CSMS, TopazEV offers subscription-based charging software built on the same open foundation—using flat monthly fees that scale with your network and never take a percentage of transaction revenue.
CitrineOS - An open-source CSMS foundation designed around open standards like OCPP, OCPI, and ISO 15118. CitrineOS powers many of our production deployments and serves as the extensible core for custom platforms.
Custom Software & Professional Services - For organizations ready to differentiate, we build proprietary features, integrations, and workflows on top of CitrineOS—giving you ownership of your software, your roadmap, and your IP.
TopazEV
For teams not yet ready to invest in a custom CSMS, TopazEV offers subscription-based charging software built on the same open foundation—using flat monthly fees that scale with your network and never take a percentage of transaction revenue.
Open Standards at the Core. Flexibility for the Long Term
Legacy charging software often locks operators into rigid pricing, limited extensibility, and closed ecosystems. S44 Energy takes a different approach. By building on open standards and open-source foundations, we enable:Hardware-agnostic deployments. Predictable, transparent operating costs. Easier integrations and future upgrades. Freedom from vendor lock-in.
This approach lowers total cost of ownership while giving operators control over how their networks evolve.
S44 Energy Leadership Team
Olga Haygood
CEO
Thana Paris
Head of Product/Director of Open-Source
Jason Cardosi
Head of Sales & Partnerships
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