Embedded Firmware Test Engineer

• 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.

SENS ise 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., * 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.

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.

Onsite Perks

• Free gym with 24/7 access
• Free Electric Vehicle charging
• Breakfast and Lunch Caf
• After hours Grab & Go snacks
• Basketball court
• Walking paths, * Paid Time Off
• Paid holidays
• Medical insurance
• Dental 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.

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