Full-Time

Software Sales Engineer

Posted on 9/26/2025

FlexGen

FlexGen

201-500 employees

Energy storage systems with optimization software

No salary listed

Durham, NC, USA

Hybrid

Remote work possible depending on qualifications and schedule flexibility; east coast preferred.

Category
Sales & Solution Engineering (1)
Requirements
  • An associate' degree in electrical engineering, computer science, or similar
  • A fast learner willing to build processes and standardization to scale for exponential growth
  • At least five years of industrial or power industry software and controls experience
  • Understanding of BESS operation, components, and applications
  • Familiarity with grid-scale energy storage use cases, such as peak shaving, frequency regulation, energy arbitrage, and renewable integration
  • Experience with energy management systems (EMS), SCADA, or similar control software
  • Ability to create and understand technical specifications, proposals, and user manuals
  • Excellent active listening and customer service skills
  • Capability to present technical concepts clearly to non-technical stakeholders
  • A relevant certificate or license is advantageous
  • A valid driver's license and willingness to travel
  • The ability to pass a background and toxicology screen
  • Located in Durham, North Carolina, or east coast preferred; Open to remote work depending on the level of qualification and flexibility of daily schedule
Responsibilities
  • Cross functional internal collaboration - work closely with product managers, and software engineers to understand the features of full scope software offering, the use cases for each and their respective value propositions
  • Participate in reviewing and submitting technical responses
  • Assist Business Development with technical aspects of customer engagement
  • Provide technical support contract negotiation
  • Travel to relevant industry trade shows to meet and consult with customers and the partner community
  • Customer Engagement & Support: Work closely with customers to understand their operational needs, technical requirements, and project goals
  • Proposal Assistance: Provide technical input for proposals, RFP responses, and ROI assessments to ensure alignment with customer needs and business objectives

FlexGen provides integrated energy storage solutions by designing and deploying battery energy storage systems (BESS) and pairing them with HybridOS, a proprietary software platform that manages and optimizes these assets. The product combines hardware and software to enable automated energy dispatch from batteries, solar/wind, and conventional generators to meet grid demands. It can manage a single site or an entire fleet of storage assets and delivers real-time data and performance analytics. Unlike competitors that may focus on either hardware or software alone, FlexGen offers a tightly integrated, software-first solution that coordinates multiple energy sources and storage assets in one system. Its goal is to support the energy transition by stabilizing the power grid, integrating renewable energy, and ensuring reliable power supply for utilities, independent power producers, and large industrial customers, while optimizing asset performance and cost for its customers.

Company Size

201-500

Company Stage

Debt Financing

Total Funding

$357.5M

Headquarters

Durham, North Carolina

Founded

2009

Simplify Jobs

Simplify's Take

What believers are saying

  • CES acquisition adds 125 technicians and 15 GWh commissioning expertise.
  • Powin assets expand footprint to 25 GWh in 10 countries.
  • Rosendin partnership targets data center power reliability growth.

What critics are saying

  • Tesla dominates utility-scale storage, eroding FlexGen's market share.
  • CES integration causes operational friction and customer churn.
  • Battery chemistry shifts obsolete HybridOS State of Health algorithms.

What makes FlexGen unique

  • HybridOS v13 provides predictive diagnostics and unified solar-storage control.
  • Hardware-agnostic EMS manages 25 GWh across 10 countries.
  • 98% fleet availability outperforms industry by 5%.

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Benefits

Health Insurance

Paid Vacation

Paid Sick Leave

Paid Holidays

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

2%

2 year growth

2%
The Associated Press
Apr 2nd, 2026
FlexGen acquires Clean Energy Services to enhance battery storage reliability and expand service offerings

FlexGen Power Systems has acquired Clean Energy Services (CES), a provider of battery energy storage and utility-scale solar services. The deal strengthens FlexGen's battery storage leadership by adding CES's commissioning and lifecycle service capabilities to its existing software offerings. Founded in 2022, CES will operate as a FlexGen subsidiary whilst maintaining its existing customer base. CES brings over 125 field technicians and engineers, having commissioned more than 15GWh of battery storage systems and servicing over 1GW of solar and 4.5GWh of battery assets. The acquisition enables FlexGen to offer integrated solutions combining its HybridOS energy management software with CES's field service expertise. CES will continue operating its remote operations centre in Houston, whilst FlexGen maintains its Durham facility, together providing 24/7 monitoring across their combined portfolios.

The Associated Press
Feb 19th, 2026
FlexGen unveils HybridOS v13 energy management system for battery storage and solar projects

FlexGen Power Systems has announced the latest version of its HybridOS energy management system, designed to maximise performance for battery storage and solar projects. The hardware-agnostic platform features a unified user interface providing real-time visibility across all assets from a single panel. Key updates include predictive diagnostics to identify hardware issues proactively, enhanced battery management system functionality to extend battery lifespan, and expanded power plant controller capabilities for unified solar and storage management. The system enables operators to increase grid service participation and convert curtailed energy into dispatchable power during peak demand. FlexGen serves over 200 energy storage systems totalling more than 25 GWh globally. The company provides battery energy storage solutions and software to utilities, developers and industrial clients.

EnergyStoragePro
Aug 22nd, 2025
FlexGen Acquires Powin Assets, Growing Energy Storage Footprint to 25 GWh in 10 Countries

FlexGen acquires Powin assets, growing energy storage footprint to 25 gwh in 10 countries.

Batteries International
Aug 15th, 2025
FlexGen secures court approval for Powin assets acquisition

August 15, 2025: Flexgen Power Systems said on August 6 it had been given court approval to acquire a substantial portion of the business of US-based BESS developer Powin.

Latitude Media
Aug 13th, 2025
Can FlexGen leverage Powin's bankruptcy to compete with Tesla?

A bankruptcy court in New Jersey last week approved a deal in which FlexGen Power Systems will purchase intellectual property and a "significant spare parts inventory" from former competitor Powin.

INACTIVE