Apply today to join our team

Multistack is a leading manufacturer of chiller and heat pump systems, delivering energy-efficient HVAC solutions for commercial and industrial facilities worldwide. As the original innovator of modular chiller technology, we continue to set the standard with flexible, high-performance systems and environmentally responsible designs.

We offer competitive wages and a comprehensive benefits package, including health, dental, vision, and life insurance, short- and long-term disability, 401(k) match, paid holidays, and paid vacation.

This role will focus on ensuring the quality, reliability, and usability of Multistack‘s internal and customer-facing software applications. You will work closely with developers, product stakeholders, and cross-functional teams throughout the software development life cycle to validate new features, identify defects, and support dependable releases. Testing will primarily support our backend-driven Next.js/C# application and new tooling built within a larger connected system. Submit your resume by filling out the form below (no phone calls please).

Responsibilities:

• Create and execute functional, integration, system, regression, and user acceptance tests.
• Test applications across our C#/.NET, Next.js/React, GraphQL, and PostgreSQL environment.
• Identify, document, track, and verify software defects.
• Test APIs and validate application data using SQL.
• Work with developers and stakeholders to clarify requirements, acceptance criteria, and release risks.
• Maintain test plans and regression coverage for key workflows.
• Support release validation and contribute to QA processes, standards, and documentation.

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Qualifications:

• 1–3 years of professional software QA, testing, or related technical experience.
• Experience creating and executing software test cases.
• Strong troubleshooting, problem-solving, and defect documentation skills.
• Experience with SQL and relational databases.
• Experience testing APIs; GraphQL experience is a plus.
• Familiarity with modern web applications, React, and C#/.NET.
• Familiarity with Git, CI/CD, and bug/work-item tracking tools such as Azure DevOps.
• Strong written and verbal communication skills.
• Ability to work independently and collaborate with a small development team.

Nice to Have:

• Bachelor’s degree in Computer Science, Information Systems, Software Engineering, or a related field.
• Experience with automated testing tools or frameworks.
• ISTQB certification.
• Familiarity with Docker, Kubernetes, and Azure.
• Familiarity with Terraform or other Infrastructure-as-Code tools.
• Experience with Azure DevOps or GitHub Actions.
• Background or interest in the HVAC industry.

Benefits:

• Competitive salary and benefits package.
• You’ll have the opportunity to grow your technical skills while working alongside experienced engineers in a collaborative environment.
• Professional development and growth opportunities.