Internship Junior Mern Stack Developer Jobs in Three Rivers, MI

SUMMARY

The Senior Developer plays a key role in designing, enhancing, and supporting enterprise applications that serve a network of 30+ manufacturing and distribution business units. This position operates within a centralized IT shared services model, partnering with cross-functional stakeholders to deliver scalable, reliable solutions that improve operational efficiency. The role is a hands-on full stack position spanning backend services, database design, and modern front-end applications.

KEY RESPONSIBILITIES

• Design, develop, and maintain business-critical applications that support multiple manufacturing sites and business units
• Translate business requirements into practical, scalable technical solutions with a focus on usability and long-term sustainability
• Lead development efforts across modern application stacks, ensuring performance, reliability, and maintainability
• Contribute to and uphold best practices in distributed application design, code quality, and testing (including TDD)
• Act as a senior resource for application architecture, code quality, and development standards
• Partner with operations, supply chain, finance, and plant leadership to understand workflows and identify opportunities for system improvements
• Support integration between ERP systems, shop floor systems, and other enterprise platforms
• Troubleshoot and resolve application issues, ensuring minimal disruption to business operations
• Contribute to prioritization and roadmap planning within a shared services IT model supporting multiple stakeholders
• Mentor junior developers and provide guidance on best practices, documentation, and problem-solving approaches
• Participate in system upgrades, enhancements, and continuous improvement initiative

REQUIREMENTS/QUALIFICATIONS

Education:

• Bachelor’s degree in computer science, Information Systems, or related field (or equivalent experience). Equivalent work experience or relevant certifications may be considered in lieu of degree.

Experience

• 5+ years of application development experience in a business environment
• Strong Experience with:

MSSQL and database design

C# and modern application development framework

Azure PaaS services, including Functions and SQL Azure

Clause Code/Codex preferred but not required

Rust/Go/Angular/React preferred but not required

• Strong understanding of application design, data structures, and system integration concepts
• Proven experience as a full stack developer across backend (C#, APIs, data) and frontend (TypeScript, Vue/Blazor) technologies
• Hands-on experience with Test-Driven Development (TDD) and structured testing practices
• Ability to work effectively in a shared services environment with competing priorities across multiple business units

SPECIFIC KNOWLEDGE, SKILLS OR ABILITIES

• Strong written and oral communication.
• Organization and attention to detail.
• Analytical and problem-solving skills.
• Time management.
• Systems analysis.
• Mathematical and deductive reasoning.
• Critical thinking.

PHYSICAL DEMANDS/WORK ENVIRONMENT

The physical demands described here are representative of those that must be met by an employee to successfully perform the functions of this job with or without reasonable accommodation.

The work environment characteristics described here are representative of those an employee encounters while performing the functions of this job.

Physical Requirements:

• Sit and stand as needed.
• May require walking on a level surface for periods throughout the day.
• Reaching above shoulders, below waist and lifting as required to file documents or store materials.
• Lifting to 25 lbs.

Work Environment:

• Typical office setting
• Moderate noise (i.e., business office with computers, phones and printers, light traffic).
• Ability to work in a confined area.
• Ability to sit at a computer terminal for an extended period time.

Disclaimer: This list does not represent all physical demands. Descriptions are representative of those that must be met by employee to successfully perform the essential functions of the job. Reasonable accommodation may be provided to enable individuals with disabilities to perform the jobs’ essential functions.

Welch Packaging is proud to be an equal opportunity workplace. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability, or protected veteran.