Mid Backend Developer Jobs in Missouri (NOW HIRING)

Do you want to work for a company where the people are the purpose? At Grimco, our developers operate across a real, multi-platform technology stack — and their work ships. As a Senior Developer, you’ll contribute to a platform that has powered the business for decades and continues to modernize. You’ll bring strong development fundamentals, an ability to learn and work across languages and environments, and the judgment to navigate complex systems confidently.

Key Responsibilities & Duties

• Build and maintain business application features across a multi-platform technology stack.
• Design and implement integrations between internal systems, external partners, APIs, and data pipelines.
• Apply modern development practices — clean code, modular design, SQL-first data access, and structured testing — regardless of the language or environment.
• Serve as a technical resource on complex projects, contributing to design decisions and seeing work through to delivery.
• Identify and follow through on opportunities to modernize and improve existing systems.
• Collaborate with IT, project management, QA, and business stakeholders to deliver well-scoped, well-documented solutions.
• Learn, maintain, and expand RPG applications as part of a broader development role.

  Work Authorization: Candidates must be authorized to work in the 
  United States. Grimco does not provide employment visa 
  sponsorship (e.g., H-1B, O-1, TN) and will not do so in the future 
  for this position.

REQUIRED QUALIFICATIONS
•    5+ years of professional software development experience.
•    Demonstrated ability to learn and work in unfamiliar languages, frameworks, or platforms.
•    Strong SQL and relational database skills — you write efficient queries and understand data modeling.
•    Experience building integrations between systems — APIs, file-based exchanges, ERP connectivity, or similar.
•    Comfortable working with legacy code you didn’t write — reading, understanding, and improving it with confidence.
•    Clear communication skills — you can explain technical decisions to non-technical stakeholders without losing the important detail.
•    Security awareness baked into how you work, not treated as an afterthought.
 

Preferred Qualifications

• Background in distribution, warehousing, manufacturing, or order management systems.
• Experience with ERP platforms — custom-built or mid-market.
• Exposure to EDI or data interchange — X12 transaction sets, flat file automation, trading partner integrations.
• Cloud integration experience — REST/JSON APIs, Azure, AWS, or similar.
• Familiarity with IBM Power Systems or other enterprise backend platforms.
• RPG or IBM i development experience, or a demonstrated interest in the platform.

Benefits

• Full medical, dental, and vision benefits available. Premiums have remained unchanged for more than 16 years.
• Paid Maternity/Paternity Leave.
• Paid Holidays.
• Paid Time Off Accrual (Paid Time Off payout available).
• 401K with Profit Sharing, up to 6% of the employee’s total compensation earnings.
• Employee Referral Benefits.
• Volunteer Time Off.

Grimco is a national wholesale sign supply manufacturer and distributor with over 65 locations across North America and the United Kingdom. Founded over 150 years ago and still family-owned, we focus on delivering quality products and outstanding service to the sign industry. Our platform has powered the business for decades — and continues to evolve.

By completing this online application for employment, you certify that the information on this application is true and complete to the best of your knowledge. You understand that any misrepresentation or omission of fact in response to any inquiry made in this application may result in rejection of application or, if hired, dismissal whenever it is discovered. You authorize and release all parties from any liability or damage that may result from seeking, furnishing, or using such information. You understand and agree that, if hired, your employment is for no definite period and may, regardless of the date of payment of compensation, be terminated by Grimco, Inc. at any time, for any or no reason, with or without notice. You understand that no representation to the contrary is valid unless in writing, set a definite term of employment, and signed by the company's CEO. You further understand and agree that any job offer is contingent upon your passing, to the company's satisfaction, a drug and/or alcohol test, criminal background check and other possible screenings. You understand that this application is active for 90 days only, and if you do not hear from the company but still wish to be considered for employment after 90 days, you will need to fill out a new application.