SOFTWARE DEVELOPER (MID-LEVEL)

Multistack, LLC; Wisconsin; On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

Health insurance

Dental insurance

Vision insurance

Life insurance

401(k) match

Paid holidays

Paid vacation

Job summary

Multistack is seeking a software engineer to build and maintain internal and customer-facing applications, focusing on our backend-driven Next.js/C# platform and related tooling within a connected system.

You will collaborate with senior developers and product stakeholders to deliver reliable features, write clean code, participate in code reviews, and help refine requirements. The role is based in Wisconsin with on-site work expectations.

Qualifications

• 3–5 years of professional software development experience.
• Experience with C#/.NET for backend development.
• Experience with React and modern JavaScript frameworks; JS experience is a strong plus.

Responsibilities

• Design, develop, and maintain software applications using our core stack (C#/.NET, js, GraphQL, PostgreSQL).
• Collaborate with senior engineers and stakeholders to implement new features and improvements.
• Develop scalable applications within our connected system; write clean, well-tested code; perform code reviews; document and share knowledge.

Skills

C#/.NET

React

GraphQL

PostgreSQL

Git

CI/CD

Docker

SQL

Unit testing

Education

Bachelor’s degree in CS or related field

Tools

Azure

Kubernetes

Terraform

Azure DevOps

GitHub Actions

Job description

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, js, HotChocolate GraphQL, PostgreSQL).


• Collaborate with senior engineers and stakeholders to implement new features and


• 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


• Experience with C#/.NET for backend


• Experience with React and a solid understanding of modern JS frameworks; js experience is a strong plus.


• Experience building or consuming GraphQL


• Experience with PostgreSQL or relational databases, including writing raw SQL queries.


• Familiarity with modern development practices: Git, code reviews, CI/CD


• Familiarity with Docker and containerized


• Ability to work independently on well-defined tasks with minimal


• Solid understanding of core mathematical

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


• Health, dental, vision, and life


• Short- and long-term disability


• 401(k) with company


• Paid holidays and paid


• Direct mentorship from senior engineers on a small, collaborative


• Professional development and growth opportunities as we expand our platform