Lead PLC Software Developer

Voltify

12d•$140,000 - $180,000•Hybrid

About The Position

Voltify is seeking a hands-on Lead PLC Software Developer to take ownership of the controller software for their microgrid control management system. This system commands real energy assets in the field and ensures the charging infrastructure for their battery locomotives operates reliably. The role involves designing, implementing, and deploying control software across various PLC platforms, including traditional hardware PLCs and soft-PLCs. The software will integrate diverse energy assets such as solar, Battery Energy Storage Systems (BESS), grid interconnects, and chargers into a unified control plane. The company is in a growth phase, with evolving requirements, and seeks an adaptable individual who can manage the entire system architecture while also focusing on intricate details. This position offers a future growth path into building and leading the U.S. controls team, setting technical standards for future hires. The company emphasizes extreme ownership and speed, appealing to those who want to actively build the future of rail energy.

Requirements

6+ years of hands-on PLC software development, with proven experience implementing multiple types of PLCs — both hardware PLCs and soft-PLCs.
Strong command of CODESYS and at least one proprietary / vendor environment (e.g. Siemens, Rockwell, Beckhoff, B&R, Schneider, Mitsubishi, Omron) — and the ability to ramp quickly on any platform we throw at you.
Fluency in the IEC 61131-3 languages (Structured Text, Ladder, FBD, SFC) and sound judgment about when to use each.
Fluency in industrial communication protocols: Modbus TCP/RTU, OPC-UA, DNP3, or CANbus.
A proven track record integrating software with physical hardware. You are comfortable debugging issues where the "bug" might be a loose wire, a protocol mismatch, or a misconfigured register map.
Strong proficiency in Python. Beyond PLC programming, you build standalone services, data pipelines, and automation tools. We treat this as a signal — the engineers who thrive here move fluidly across the whole stack instead of staying boxed into one layer.
Range. You can hold the whole system architecture in your head and also obsess over the smallest detail. You adapt fast when requirements change and stay effective when the task is something you've never done before.
Extreme ownership, strong research and learning ability, and excellent critical-thinking and problem-solving skills.
Willingness to travel extensively to our sites across the U.S. (and occasionally beyond).
The ambition and interpersonal skills to grow into a leadership role managing the U.S. team.

Nice To Haves

Experience implementing microgrids or working with DERs, power flows, and energy management systems.
Experience with AWS services (e.g. IoT Core, Lambda, DynamoDB) for cloud-connected control applications.
Experience with JavaScript/TypeScript for dashboards or internal tooling.

Responsibilities

Design, develop, deploy, and maintain PLC software for microgrid control management across a variety of platforms — both hardware PLCs and soft-PLCs (PC-based / runtime controllers).
Implement control logic in CODESYS and in proprietary / vendor-specific environments — for example Siemens TIA Portal (SCL/STL), Rockwell Allen-Bradley Studio 5000 / RSLogix, Beckhoff TwinCAT, B&R Automation Studio, Schneider EcoStruxure / Unity, Mitsubishi GX Works, or Omron Sysmac.
Write robust, maintainable code using the IEC 61131-3 languages (Structured Text, Ladder, Function Block Diagram, Sequential Function Chart) as each platform and task demands.
Architect and implement control for complex microgrid systems — managing solar inverters, battery energy storage systems (BESS), grid-tie interconnections, and EV/locomotive chargers, including islanding/reconnection and protection coordination.
Integrate diverse industrial hardware using protocols such as Modbus TCP/RTU, OPC-UA, DNP3, and CANbus.
Implement and harden the bi-directional Cloud ↔ Edge communication pipeline (e.g. via MQTT), ensuring data integrity and gracefully handling connectivity edge cases.
Travel frequently to our deployment sites for on-site commissioning, integration testing, and troubleshooting — this is a meaningful part of the job, not an occasional add-on.
Set engineering standards, conduct code reviews, define MVPs, and make architectural decisions that balance speed with reliability — laying the groundwork to build and lead the U.S. controls team.