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Application Developer Co-op

Greenheck · Schofield, WI · Full time

Posted Sep 25, 2026 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about a project where you wrote code in C# or a similar language. What did it do and what was the hardest part?

What they are checking: Whether they have built something real and can explain their own decisions clearly.

Tell me about a time you were stuck on a problem. How long did you try before asking for help?

What they are checking: Whether they balance independence with knowing when to ask, which keeps a co-op productive.

Describe a time you noticed a manual process that could be automated. What did you do about it?

What they are checking: Whether they look for improvement opportunities on their own, which the posting calls out directly.

This co-op runs January through August. What do you hope to be able to do by the end of it that you can't do now?

What they are checking: Whether they have specific growth goals and will take ownership of their own learning.

What would you do

You fix a bug and your change breaks something else that seemed unrelated. What do you do?

What they are checking: Whether they test carefully, speak up quickly and learn to check side effects before shipping.

A business partner asks for a dashboard but can't tell you what decisions it should support. How do you proceed?

What they are checking: Whether they ask good questions to find the real need before building the wrong report.

About the work

How would you write a SQL query that totals orders by customer for the last 30 days?

What they are checking: Whether they have working SQL basics with grouping, filtering and dates that business reporting needs.

What is XML used for, and when might you run into it in a business application?

What they are checking: Whether they understand structured data formats commonly used to move information between systems.

How have you used Git on a team project? Tell me about a time a merge went wrong.

What they are checking: Whether they can work in a shared codebase without losing or overwriting other people's work.

How do you use AI tools when you code, and how do you check what they give you?

What they are checking: Whether they treat AI output as a draft to verify rather than trusting it blindly.

Practice this interview out loud.

Offer builds a real interview for this exact role at Greenheck from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.

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The full job description

As published by Greenheck.

We are looking for highly motivated student to join our team as Application Developer Co-op from January- August 2027. Greenheck Group is a dynamic, multi-branded  international commercial HVAC manufacturer . Our equipment is used worldwide in commercial, institutional, and industrial facilities, ranging from comfort ventilation to manufacturing processes. Our efficient  products improve comfort, safety, and health  of lives across the planet. Since 1947, we are deeply committed to helping you “ Build Your Future ,” through professional growth, challenging projects, and exciting opportunities to explore your career path. WHAT YOU'LL BE DOING • Support the development, testing, and enhancement of business applications and software solutions. • Write, test, troubleshoot, and maintain code using languages and tools such as C#, XML, SQL, and related technologies. • Support software quality assurance, testing, debugging, and issue resolution. • Work with data to develop reports, dashboards, and other solutions that support business decision-making. • Collaborate with developers, business partners, and other team members throughout the development process. • Use tools such as Jira, Git, and approved AI tools to support development, documentation, and project work. • Identify opportunities to improve or automate existing applications, processes, and reporting solutions. WHAT YOU SHOULD HAVE • Enrollment in a related bachelor’s degree program (Computer Science, Computer Engineering, Industrial Engineering, Business Analytics, Statistics, or similar degree with technical aptitude) • On track to graduate in the next 3 semesters • Experience with object-oriented programming through coursework, projects, or previous work. • Familiarity with C#, SQL, XML, or similar programming languages and technologies. • Exposure to software development tools and practices such as Git, Jira, testing, debugging, and version control. • Familiarity with databases, structured data, and querying data using SQL. • Strong problem-solving and analytical skills with an interest in developing technical solutions. • Ability to collaborate on projects and communicate effectively with both technical and business partners. • Exposure to Power BI, Python, data visualization, or AI-assisted development tools is a plus. COMPENSATION & BENEFITS Greenheck Group takes pride in providing competitive pay.  The starting base pay range for this position is $20.00/hour - $28.00/hour and is based on position and academic year. In addition to competitive pay, co-ops receive paid time off for company-observed holidays and are eligible for additional financial support through a housing allowance or sign-on bonus. SPECIAL NOTATION The preceding statements are intended to describe the general nature and level of work being performed by people in this position. They are not intended to be construed as an exhaustive list of all responsibilities, duties, and skills. The Employer retains the right to change or assign other duties to this position. PHYSICAL REQUIREMENTS Work is performed in an office environment and requires the ability to operate standard office equipment, such as a computer and phone. Sedentary work. Exerting up to 10 pounds of force occasionally and/or negligible amount of force frequently or constantly to lift, carry, push, pull or otherwise move objects. Repetitive motion. Substantial motions of the wrists, hands, and/or fingers. The person is required to have close visual acuity to perform an activity such as: preparing and analyzing data, and figures; transcribing; viewing a computer terminal; extensive reading. Occasional mobility required to attend in-person meetings and complete various office tasks. EEO STATEMENT We are an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. ACCOMMODATIONS REQUEST Greenheck Group complies with federal and state disability laws and makes reasonable accommodations for applicants and candidates with disabilities. To request an accommodation for the application or interview process, please email HR@greenheck.com with your name, job title, posting number, and requested accommodation. RECRUITING FRAUD ALERT At Greenheck Group, your personal information and online safety are our top priorities. Our recruiters will only direct candidates to apply through our official career page at https://greenheckgroup.com/careers/ . We will never request payments, financial account details, or sensitive information such as Social Security numbers. If you’re unsure about the legitimacy of a message, please contact HR@greenheck.com for verification. If you're looking for a place to grow while working with happy, enthusiastic, values-based people, you'll enjoy your career with us!

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