Software Development Engineer in Test

Software Development Engineer In Test (Sdet)

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.

We are looking for an experienced Software Development Engineer in Test (SDET) to join our engineering team. The SDET will be responsible for designing, developing, and maintaining an Automated Testing Framework from front-end to backend, ensuring the highest levels of reliability and performance of our line of Industrial Battery Charging products and solutions.

Responsibilities

• Build an automation framework to test code being released to production.
• Contribute design and development of an Automated Test Framework used to verify Charger Products and Solution functions.
• Collaborate with the Engineering team to identify Product Test Case requirements.
• Collaborate in project planning and prioritization for Test Plan creation, design, implementation, and execution phases.
• Design and develop Test Cases and Test Suites corresponding to Test Plan requirements that meet hardware and firmware specifications, and quality standards.
• Monitor and report on automated test coverage to stakeholders.

Required Qualifications

• Bachelor's degree in Computer Science, Electrical Engineering, Computer Engineering, or related degree.
• 5+ years of experience in an SDET or Software Engineering role.
• Experience with TCP-IP and UDP protocols.
• Experience with UI testing tools such as Playwright, Cypress, Selenium, TestComplete or similar.
• Experience testing Web and Desktop Applications.
• Proficient with one or more Object Oriented languages such as C# or Java.
• Proficient in developing and deploying applications on both Linux and Windows platforms.
• Experience with scripting languages such as Bash, PowerShell, Python.
• Experience with Source Code repositories such as GitHub.
• Experience conducting code reviews and provide feedback to ensure code quality and adherence to best practices.
• Ability to build and maintain a continuous deployment (CD) pipeline on hardware products.
• Strong AI literacy, with the ability to effectively use AI-assisted development and testing tools to improve test automation, accelerate defect analysis, increase test coverage, and enhance software quality.

Preferred Qualifications

• Experience with.NET/.NET Core frameworks.
• Experience with Entity Framework.
• Experience with Test Results report creation.
• Experience with Performance and Stress testing software/hardware integrations.
• Experience with HTML and DOM structure.
• Experience working with a development team on medium-to-large applications (web server, persistence, asynchronous distributed systems, etc).
• Experience with front-end development using.NET Blazor or other Web UI technologies.
• Familiar with User Experience (UX) concepts and design.
• Experience with Relational Databases, schema design, SQL commands to create, store, retrieve, and modify data in a database.
• Experience with RESTful API design and development.
• Experience with Observability tools such as Grafana, Prometheus, etc.
• Experience with CAN bus and Modbus protocols.
• Experience working and communicating with test equipment such as voltmeters, data acquisition systems, load banks, and similar instruments.
• Ability to understand and troubleshoot test and measurement devices and their associated communication interfaces.
• Ability to read and understand electrical schematics and wiring diagrams.
• Automated testing for compliance with standards is a plus (ex: IEEE1547, UL 2202).
• In-depth knowledge of critical power genset backup, charger/battery systems or battery monitoring.

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

Base Compensation: $103,000 - $146,000 is the projected range of annual base salary for this role depending on the candidate's overall qualifications and experience.

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

Closing Date: October 1st. 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 Café
• After hours Grab & Go snacks
• Basketball court
• Walking paths

Benefits

• 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.

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.