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EV Charging Software & Engineering
We build platform software and engineering solutions that power scalable EV charging networks.
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Start Your Free Trial of TopazEV

Open-Source EV Charging Management


TopazEV is an open-source EV charging management platform built on CitrineOS. Built for operators — fleets, commercial properties, and public networks. OCPP 1.6, 2.0.1, and 2.1. No vendor lock-in, no per-session fees.


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Selected Custom Engineering Engagements

Fast Scaling EV Charging Network

Our Tailored Backend Solution for Optimized EV Charging
Product
Automotive
E-Mobility
Energy

Digital Tools Streamline HVAC Installations

Intuitive Heat Pump Tool
Product
Automotive
E-Mobility
Energy

EV Charging Native Mobile App

Electric Car Charging at Your Fingertips
Product
Automotive
E-Mobility
Energy

Digital Twin: Energy Distribution Virtual Model

No More Waste in Energy Generation
Product
Automotive
E-Mobility
Energy

Agile Cross-Functional Teams Focused on End-User Needs

Our cross-functional teams use a comprehensive approach to product development, leveraging agile methodologies to craft solutions that prioritize end-user needs, business requirements, technical expertise, and industry knowledge. The result is impactful digital experiences that drive significant business impact.
Our Capabilities
Open Charge Alliance Member
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Linux Foundation Energy Member
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EVRoaming Foundation Member
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S44 Energy Leadership Team

Julian Offermann

Julian Offermann

Founder & CTO
Olga Haygood

Olga Haygood

CEO
Thana Paris

Thana Paris

Open-Source Engineering Lead
Jason Cardosi

Jason Cardosi

Head of Sales & Partnerships

Open Roles at S44 Energy

Currently, we don't have any open positions, but we're always on the lookout for talented individuals. Check back later or feel free to reach out.

Build Your Charging
Platform With Us

Latest S44 Energy Articles

Insights
min read

Planning EV Charging Infrastructure: Selecting the Right CSMS, Managing Costs, and Preparing for Compliance

A practical guide to planning EV charging infrastructure: CSMS selection, build vs. buy, RFP requirements, NEVI compliance, and long-term cost and scalability planning.
Insights
min read

EV Charging Network Architecture: How Charging Platforms Power Reliable Infrastructure

Learn how EV charging networks are built: CSMS platforms, OCPP communication, payment systems, data infrastructure, and roaming — from S44 Energy engineers.
Insights
min read

Open Standards in EV Charging: OCPP, OCPI, and the Software Platforms Powering Interoperable Networks

How open standards like OCPP, OCPI, and ISO 15118 enable interoperable EV charging networks — and how CitrineOS and TopazEV are built around them.
Insights
min read

How EV Charging Payments Work

Learn how EV charging payments work: pre-authorization holds, pricing models, multi-party settlement, and what to look for in a CSMS payment integration.
Insights
min read

Why EV Chargers Go Offline — The Real Causes Behind Charging Network Downtime

EV charger downtime is rarely a hardware issue. Explore the real causes — connectivity failures, firmware conflicts, and power constraints — and how to fix them.
Insights
min read

The Complete Guide to EV Charging Software Platforms (CSMS)

Everything you need to know about EV charging software: CSMS architecture, open standards, payment systems, how to scale, and how to choose the right platform.
Insights
min read

EV Charging Is Becoming a Payments Network

Why EV charging is evolving into financial infrastructure — and how open platforms give operators control over authentication, pricing, and revenue settlement.
Press
min read

EV Charging is the Next Profit Center for Car Dealers

S44 Energy CEO Olga Haygood on how car dealerships can turn EV charging into a scalable revenue stream using smart software and open infrastructure. Featured in Motor Trade News.
Press
min read

Automotive News Guest commentary: The dynamic pricing roadblock in EV charging

Automotive News guest commentary by S44 Energy CEO Olga Haygood: why dynamic EV charging pricing is difficult — and what operators and networks need to get there.
Insights
min read

EV Charging Needs Open Source

CitrineOS and TopazEV are built on the belief that open-source infrastructure gives CPOs the flexibility, interoperability, and control that closed SaaS platforms cannot.
Press
min read

S44 Energy Launches TopazEV to Democratize Access to EV Charging Software

Press release: S44 Energy launches TopazEV, the industry's first OaaS CSMS. Supports OCPP 1.6, 2.0.1, OCPI & ISO 15118. No vendor lock-in or per-session fees.
Press
min read

Q&A with Olga Haygood, CEO of S44 Energy

S44 Energy CEO Olga Haygood on why 1 in 5 charging attempts fail, what OCPP 2.0.1 changes, and how open infrastructure solves EV charging's core problems.
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