Principal Software Engineer

About the Role

Xometry is looking for a Principal Software Engineer to join our Partner Ecosystems team. This team builds the high-performance integration layer that embeds Xometry’s AI-native marketplace directly into the world’s leading CAD and PLM platforms.

You will be the primary technical architect for our landmark partnership with a major enterprise partner. You will be responsible for extracting Xometry’s core AI engines (DFM and IQE) and natively embedding them into our partner's core digital ecosystems, enabling a real-time workflow where designers receive manufacturability and pricing feedback on native 3D geometry directly within their design environment.

*Note: This role requires a hybrid schedule (3 days a week) at our North Bethesda, MD or Waltham, MA office location.*

How You'll Contribute

• Software Development and Technical Craft: Lead discovery, architectural design, and adoption of our flagship embedded partner integration. Introduce best practices for handling native 3D geometry data flows and ensure scalable, extensible systems.
• AI Fluency: Leverage AI tools to accelerate geometry-processing pipelines and collaborate with Data Science to ensure the Instant Quoting Engine (IQE) performs with sub-second latency within partner application UIs. Define AI fluency standards and coach engineering staff.
• Problem Solving and Decision Making: Address deep technical coupling between Xometry’s marketplace and partner enterprise software environments. Choose methods for ring-fenced data governance and "one-click" order placement within enterprise-grade security constraints.
• Scope and Impact: Lead cross-team technical decision-making and execute multi-quarter roadmaps for deep, native integrations.
• Collaboration and Communication: Serve as the primary technical contact for partner engineering teams, guide internal teams toward a unified digital thread, and mentor senior and mid-level engineers.
• Operational Excellence: Own reliability, monitoring/alerting, and security of integration microservices.

Qualifications

Required

• 8–12+ years of professional software development experience, with a track record of leading complex, multi-quarter initiatives
• Deep technical proficiency in Python (backend services, APIs), React/TypeScript (embedded UIs), and AWS cloud infrastructure
• Significant experience with system architecture, microservices design, and distributed systems handling high-volume data exchange
• Proven experience building enterprise-grade integrations and reusable architectural patterns
• Bachelor’s in Computer Science, Engineering, or a related field, or equivalent practical experience

Preferred

• Broad experience within enterprise engineering software ecosystems (e.g., Dassault/SolidWorks, Autodesk, or similar)
• Understanding of B-Rep, mesh formats, and 3D modeling workflows
• Experience in e-commerce, fintech, or B2B marketplaces
• Experience building dedicated-tenant or ring-fenced solutions for high-security enterprise clients