Embedded Firmware Test Engineer

Stored Energy Systems, LLC; Longmont (CO); On-site; USD 125,000 - 140,000; Full time

Benefits offered by this job

Free gym with 24/7 access

Free Electric Vehicle charging

Breakfast and Lunch Café

After hours Grab & Go snacks

Basketball court

Walking paths

Paid Time Off

Paid holidays

Medical insurance

Vision insurance

Short-term and long-term disability

Life insurance

401(k) plan with immediate vesting

Employee referral program

Job summary

Stored Energy Systems (SENS) in Longmont, CO is seeking an Embedded Firmware Test Engineer to design and develop internal and external test fixtures for industrial battery chargers, inverters and DC back-up power systems.

You will participate in the full life cycle of test fixture development, develop firmware for controllers and sensors, and create production tests to support new products through production launches.

Qualifications

• Bachelor’s degree in Electrical or Computer Engineering.
• 5+ years of relevant engineering experience.
• Strong fundamentals in development and testing with embedded systems.
• Mastery of C, C++, and scripting (BASH).
• Experience with microcontrollers and board-level communications.
• Experience with test equipment (scope, analyzers).

Responsibilities

• Participate in full life cycle of test fixture development including requirement definition, design, implementation, test, and maintenance.
• Develop, enhance, and maintain test firmware for system controllers, sensors, and accessories for power systems and battery monitors with embedded microcontrollers.
• Develop firmware to help support and execute design verification testing, and system integration to ensure performance and reliability under all operating conditions.
• Specify and design production tests and equipment to support the introduction of new products into production.

Skills

C

C++

BASH

Embedded systems

Test firmware

Lab equipment

Microcontroller familiarity

Problem solving

Education

Bachelor’s degree in Electrical/Computer Engineering

Tools

Oscilloscope

Logic analyzer

Power supplies

Electronic loads

Linux

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Embedded Firmware Test Engineer

Longmont, CO, US

2 days ago Requisition ID: 1473

Salary Range: $125,000.00 To $140,000.00 Annually

Who We Are

Stored Energy Systems (SENS) is an award-winning manufacturer of premium quality power conversion products located in Longmont, CO. In business for over 50 years, SENS is the market leader with a proven track record of providing highly reliable battery chargers, DC power systems, and related products to industrial markets. For more information on our company please see our web site at www.sens-usa.com.

SENS is looking for a self-motivated Embedded Firmware Engineer to join our growing company. This individual will help design and develop internal and external test fixtures for industrial battery chargers, inverters and DC back-up power systems. This person will be involved from concept investigation and design, through successful production launch and support of these test fixtures.

Responsibilities

• Participate in the full life cycle of test fixture development including requirement definition, design, implementation, test, and maintenance.
• Develop, enhance, and maintain test firmware for system controllers, sensors, and accessories for power systems and battery monitors with embedded microcontrollers.
• Develop firmware to help support and execute design verification testing, and system integration to ensure performance and reliability under all operating conditions.
• Specify and design production tests and equipment to support the introduction of new products into production.

Required Qualifications

• Bachelor’s degree in Electrical Engineering, Computer Engineering, or similar related field.
• 5+ or more years of relevant engineering experience.
• Strong engineering fundamentals in development and testing with microcontroller-based embedded systems.
• Mastery of computer programming and scripting languages (C, C++, BASH).
• Knowledge of board level communications (UART, I2C, SPI, CAN, etc.).
• Experience using lab test equipment such as high-speed digital scopes, power supplies, electronic loads, voltmeters, and logic analyzers.
• Proven ability to investigate failures, perform root cause analysis, validate corrective actions, and support troubleshooting efforts.
• Possesses the ability to develop test plans, procedures, and cases to conduct new product validation in Engineering to ensure products meet performance, reliability, safety, regulatory, and customer requirements.

Preferred Qualifications

• Experience working in Linux development environments.
• Experience with power electronics and analog sensors.
• Experience with the following protocols is a plus: SNMP, MODBUS, DNP3, IEC61850. Knowledge of TCP/IP networking concepts.
• Experience taking a design from concept into test execution.

Location: This position is located onsite in Longmont, CO.

Base Compensation: $125,000 - $140,000 is the projected base salary range and will be determined by the candidate’s overall qualifications and experience.

Bonus: This position is eligible for an annual bonus based on individual and company performance.

Closing Date: 10/19. While we expect to keep the position open through this date, the posting may be extended or closed early based on applicant volume and hiring needs.

• Free gym with 24/7 access
• Free Electric Vehicle charging
• Breakfast and Lunch Café
• After hours Grab & Go snacks
• Basketball court
• Walking paths
• Paid Time Off
• Paid holidays
• Medical insurance
• Vision insurance
• Short-term and long-term disability
• Life insurance
• 401(k) plan with immediate vesting
• Employee referral program

At SENS, our culture is rooted in a set of core values that reflect who we are and how we work. In a recent 2025 poll, our employees identified the values that best define us: “Innovative”, “Respectful”, “Inviting”, “Flexible”, “Collaborative”, and “Growth Driven”. Our team describes us as a dynamic, forward-thinking company where everyone has the opportunity to thrive.

We pride ourselves on being an equal opportunity employer, fully dedicated to fostering inclusion and diversity. We welcome all applicants, regardless of race, color, religion, sex, sexual orientation, gender identity, genetic information, national origin, age, disability, veteran status, or any other legally protected characteristic.

We hope you're interested in making a difference with us. Even if you don't feel that you meet every qualification listed in this job description, we still encourage you to apply.