Weekend Application Developer Jobs in Saint Louis, MO

Consider joining the MX Holdings family as an ERP Application Developer in one of our company locations- St. Louis, MO, Leetonia, OH, or Wellsville, PA. The ERP Application Developer is a hands-on Microsoft Dynamics 365 Finance & Supply Chain Developer that supports our manufacturing division, Pennex. 

This role will be responsible for developing, maintaining, troubleshooting, and deploying D365 extensions using X++, while working closely with business users, IT, and leadership to understand operational needs and deliver practical, reliable solutions. 

A successful candidate will have proven, hands-on experience with D365 and X++ development, including extension-based development, build/deployment processes, and production support.

Essential Duties and Responsibilities:

• Develops, maintains, troubleshoots, and supports customizations and extensions in Microsoft D365 using X++.
• Designs and implements D365 extensions using Microsoft-supported patterns, including extension-based development, event handlers, Chain of Command, forms, tables, classes, data entities, security, and integrations.
• Supports the full SDLC, including requirements gathering, technical design, development, unit testing, code review, documentation, deployment, production support, and continuous improvement.
• Manages and supports D365 build, release, deployment, and environment management activities in coordination with IT and business stakeholders.
• Worsk closely with business users to understand manufacturing, finance, supply chain, inventory, purchasing, production, and related business processes.
• Translates functional requirements into technical solutions that are stable, supportable, and aligned with D365 best practices.
• Troubleshoost production issues, identify root causes, and implement durable fixes.
• Maintains existing D365 customizations and extensions written by internal or external developers.
• Assists with integrations between D365 and other enterprise systems, including APIs, data entities, batch jobs, file-based integrations, and reporting/data platforms.
• Creates and maintains technical documentation, deployment notes, support documentation, and knowledge transfer materials.
• Participates in planning, prioritization, estimation, and communication for D365-related development work.
• Uses modern development practices, including source control, branching, code review, testing, DevOps pipelines, and release management.
• Leverages AI tools responsibly in the current role to improve productivity, documentation, analysis, troubleshooting, and software development quality.
• Assists the Business Analysts and Application Architects in updating relevant documentation to reflect the software applications as deployed to production.
• Performs other duties as assigned.

Ideal Candidate Will Have:

Education

• Bachelor's degree (B. A.) from four-year college or university in Engineering, Computer Science, or similar field preferred; or equivalent combination of education and experiences below.

Experience

Required

Preferred

Hands-on experience with X++ development in D365

Experience with D365 in a manufacturing environment

Experience with D365 build, deployment, environment management, and release processes.

Current use of AI tools in a professional software development or technical delivery role.

Experience using source control and modern development practices.

Experience using Visual Studio

Experience with reporting or analytics related to D365, including Power BI, Electronic Reporting, SSRS, BYOD, Data Lake, Fabric, or similar platforms.

Experience with MVC or MVP design pattern for web applications

Required Skills, Knowledge, and Abilities

General

• Ability to identify pain points for end users or operations; solves problems that resolves issues with the system
• Acts with the utmost integrity; acts as a trusted partner to IT and operations teams
• Promotes teamwork and works collaboratively with the broader IT and operations teams
• Provides a good experience when interacting with internal or external stakeholders, end users, or team members; ensures that communication and interactions are helpful and professional
• Driven and self-motivated to solve problems and improve MS D365 to meet the business needs
• Communicates effectively using verbal and written communication
• Plans and organizes work; understands how to prioritize workload/projects
• Adapts to different communication styles and circumstances. Understands change management
• Ability to apply common sense understanding to carry out instructions furnished in written, oral, or diagram form
• Ability to deal with problems involving several concrete variables in standardized situations
• Ability to follow moderately complex business logic in developing solutions
• Must be eligible to work in the United States, visa sponsorships are not available 
• Regular attendance is required
• Candidates must meet pre-employment screening requirements, including background checks and drug screenings

Technical

Required

Preferred

Intermediate or better X++ skills

Experience with CodeX or Claude Code

Ability to manage each stage of D365 code change deployment.

Experience using Visual Studio

MSFT Power Platform skills

Ability to properly utilize source code control tools

Advanced T-SQL skills

Intermediate or better C# skills

Experience with reporting or analytics related to D36, including Power BI, Electronic Reporting, SSRS, BYOD, Data Lake, Fabric, or similar platforms.

Intermediate or better Javascript skills

Basic T-SQL skills

Familiarity with WCF (Windows Communication Foundation)

Facility with Microsoft Outlook, Excel

Perks of the Job

• Medical, dental and vision insurance
• Disability and life insurance
• 401(k) with matching contribution
• Generous allotment of paid vacation and paid holidays
• Enterprise-wide winter break between Christmas and New Year’s holidays
• Competitive wages plus performance-based bonus opportunities
• Ongoing training and professional development
• Ample opportunity for career growth and advancement
• Paid time off for all new parents

Why Our People Love Working Here

• Purpose-driven, friendly, open, and respectful culture
• Highly engaged workforce – as indicated by best-in-class engagement scores
• Hybrid work schedule consisting of 3 in-office days and 2 remote days per week 
• Shared core values of safety, integrity, caring and growth
• Leaders committed to building more diverse, inclusive teams
• On-Demand pay via DailyPay
• Robust recognition and reward program
• Community Impact opportunities including additional time off to volunteer and charitable match up to $250 per employee
• Tuition reimbursement
• Complimentary refreshment bar with beverages and snacks
• Employee discount program with hundreds of partner brands
• Wellness incentive program
• Regular employee celebrations and events

Celebrating 50 years in 2024, MX Holdings is a global leader in the purchasing, processing, and manufacturing of non-ferrous metals, primarily Aluminum. Enabled by our breadth of experience and deep expertise, we are proud to deliver top-quality products and services to customers across our family of brands – including Metal Exchange and Pennex.

But it’s not just what we do that sets us apart, it’s how we do it. Safety. Integrity. Caring. Growth. These core values are embodied by each member of our team; guiding every action we take and decision we make. Whether it’s driving innovation within our industry, making the impossible possible for our customers, providing a safe, respectful workplace for employees or supporting our local communities, our purpose is clear. We are dedicated to impacting our world in a positive way.

If you are a like-minded individual with a strong ability to problem solve, collaborate and effectively communicate, MX Holdings may be the perfect place for you to grow your career.

Our Commitment to Inclusion

We welcome people of different backgrounds, abilities and perspectives. To ensure our business and culture continue to be inclusive of all people, we never discriminate on the basis of race, religion, national origin, gender identity or expression, sexual orientation, age or marital status, veteran or disability status. MX Holdings and our family of companies are proud to be equal opportunity employers. Additionally, all your information will be kept confidential according to EEO guidelines. Should you have any questions or require special assistance completing your application, please email jobs@metalexchange.com.

Qualified Applicants must be legally authorized for employment in the United States and not require employer sponsored work authorization now or in the future for employment in the United States. 

Our salary ranges are primarily determined by role, level, and location. The range provided for each job posting reflects the minimum and maximum target salaries for the position across all US locations. Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training. 

Confidentiality Agreement Required: Yes