Senior CRM & E‑Commerce Platform Engineer

Grimco; Sunset Hills (MO); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical benefits

Dental benefits

Vision benefits

Paid maternity/paternity leave

Paid Time Off

Job summary

Grimco Inc. is seeking a senior developer to join the team that builds and maintains our CRM and Grimco.com. You will collaborate with ERP and partners on integrations, help set technical direction, and modernize legacy functionality across platforms.

This role requires 7+ years of full-stack experience, strong React and C#/.NET, API design, and a track record of delivering production-grade solutions in a B2B environment, with a focus on security and scalable architecture.

Qualifications

• 7+ years of professional full-stack software development experience, including production e-commerce, CRM, or similar customer-facing/B2B applications.
• Strong front-to-back skills: React on the front end, C# / .NET on the API side, with solid RESTful API design chops.
• Strong SQL and relational database skills — efficient queries, sound data modeling, and comfort optimizing for scale.
• Demonstrated experience building integrations between systems: APIs, file-based exchanges, ERP connectivity, or similar.
• Practical experience with AI-assisted development and/or building AI or agentic features into production applications.
• Comfortable working with legacy code you didn't write: reading, understanding, and improving it with confidence.
• Clear communication skills; able to explain technical tradeoffs to non-technical stakeholders.
• Security awareness baked into how you work (authentication, data handling, PCI-adjacent considerations for e-commerce).

Responsibilities

• Build and maintain features across our CRM and Grimco.com (B2B webstore), spanning front end, back end, and database layers.
• Design and implement integrations between the CRM, the webstore, our ERP, and external partners via APIs, data pipelines, and file-based exchanges.
• Apply modern development practices across both platforms (clean code, modular design, SQL-first data access, automated and structured testing).
• Evaluate and prototype opportunities to embed AI and agentic workflows into CRM and webstore features.
• Serve as a technical resource on complex, cross-team projects, contributing to architecture and design decisions and seeing work through to production.
• Identify and act on opportunities to modernize existing CRM and webstore functionality, including legacy areas of the codebase.
• Collaborate with IT leadership, product/project management, QA, and business stakeholders to deliver well-scoped, well-documented solutions on a predictable cadence.
• Participate in code reviews, mentor other engineers, and help raise the engineering bar across the team.

Skills

React front-end

C# / .NET API

RESTful API design

SQL / relational DB

System integrations

AI-assisted development

Legacy code modernization

Clear communication

Security best practices

Job description

Grimco Inc. is seeking a senior developer to join the team that builds and maintains our CRM and Grimco.com. You will collaborate with ERP and partners on integrations, help set technical direction, and modernize legacy functionality across platforms.

This role requires 7+ years of full-stack experience, strong React and C#/.NET, API design, and a track record of delivering production-grade solutions in a B2B environment, with a focus on security and scalable architecture.