Mid-Level Software Developer

*Description* Multistack is a leading manufacturer of modular water chiller 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 building and maintaining internal and customer-facing applications that support key areas of our business. You will work closely with senior developers, product stakeholders, and cross-functional teams to deliver reliable and scalable solutions with a primary focus on our backend-driven Next.js/C# application and new tooling built within a larger connected system. *Responsibilities:*

• Design, develop, and maintain software applications using our core stack (C#/.NET, Next.js, HotChocolate GraphQL, PostgreSQL).
• Collaborate with senior engineers and stakeholders to implement new features and enhancements.
• Design, develop, and maintain scalable applications within our connected system; writing clean, well-tested code; troubleshooting and improving existing systems; participating in code reviews; refining technical requirements and implementation approaches; and contributing to documentation and team knowledge sharing.

*Qualifications Required:*

• 3–5 years of professional experience as a software developer.
• Experience with C#/.NET for backend development.
• Experience with React and a solid understanding of modern JS frameworks; Next.js experience is a strong plus.
• Experience building or consuming GraphQL APIs.
• Experience with PostgreSQL or relational databases, including writing raw SQL queries.
• Familiarity with modern development practices: Git, code reviews, CI/CD pipelines.
• Familiarity with Docker and containerized deployments.
• Ability to work independently on well-defined tasks with minimal supervision.
• Solid understanding of core mathematical principles.

*Nice to Have:*

• Experience with Next.js App Router, Apollo Client, or TanStack Query.
• Familiarity with Kubernetes (K8s) and cloud-managed container workloads.
• Experience with Azure services (AKS, ACR, Key Vault, Entra ID / MSAL authentication).
• Experience with Terraform or other Infrastructure-as-Code tooling.
• Experience with Azure DevOps or GitHub Actions.
• Background or interest in the HVAC industry.
• Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent experience).

*Benefits*

• Competitive salary commensurate with experience.
• Health, dental, vision, and life insurance.
• Short- and long-term disability coverage.
• 401(k) with company match.
• Paid holidays and paid vacation.
• Direct mentorship from senior engineers on a small, collaborative team.
• Professional development and growth opportunities as we expand our platform.