Software Development Test Engineer SDET in Longmont

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Job DescriptionJob Description

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.

Summary

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. Experience and skills in software development lifecycle, software architecture design, object-oriented design, programming, and understanding of software testing methodologies, are essential to the successful test and verification of SENS product line.

Responsibilities

• 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 equivalent in a technical field of study.
• 5+ years of experience in an SDET or Software Engineering role.
• Experience working with a development team on medium-to-large applications (web server, persistence, asynchronous distributed systems, etc).
• Architectural vision that guides implemented solutions.
• Proficient with one or more Object Oriented such as C# or Java.
• Proficient with OOP design patterns and principles.
• Proficient in developing and deploying applications on both Linux and Windows platforms.
• Experience with Relational Databases, schema design, SQL commands to create, store, retrieve, and modify data in a database.
• Experience with scripting 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.
• Networking experience with HTTP, TCP-IP and UDP protocols.
• Experience building out all or parts of an Automated Test Framework.
• Experience with Test Plan development and Product Validation.
• Experience testing the integration of software and hardware devices.
• Experience with Performance and Stress testing software/hardware integrations.
• Experience with Agile methodologies and project planning.
• Practical knowledge of issue-tracking project management software tools such as Jira, YouTrack, etc.
• Ability to multi-task in a small company environment.
• Excellent problem-solving, decision-making, communication (written and verbal), and interpersonal skills for articulating technical approaches and progress to both technical and non-technical audiences.
• Flexible team player who actively establishes and maintains effective working relationships with company management and co-workers, suppliers, and occasionally with customers.

Qualifications

• Experience with .NET/.NET Core frameworks.
• Experience with Entity Framework.
• Experience with Test Results report creation.
• Experience with front-end development using .NET Blazor or other Web UI technologies.
• Familiar with User Experience (UX) concepts and design.
• 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 with the opportunity to work a hybrid schedule once fully trained.

Base Compensation: $120,000 - $145,000 is the projected range of annual base salary for this role depending on the candidate’s overall qualifications and experience.

Closing Date: January 15th. 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.

We offer an exciting and competitive total compensation package designed to inspire! This includes generous paid time off, holidays, as well as comprehensive benefits including medical, dental, vision, short-term , life insurance, and an outstanding 401k matching program where employees are instantly vested.

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.

At SENS, we pride ourselves on being an equal opportunity employer, fully dedicated to fostering and . We welcome all applicants, regardless of , , , , , , genetic information, , , , 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 requirement listed in this job description, we still encourage you to apply.

If you are interested in applying for this job please press the Apply Button and follow the application process. Energy Jobline wishes you the very best of luck in your next career move.