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 to enable real-time manufacturability and pricing feedback on native 3D geometry.

*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 native 3D geometry data flows and ensure scalable, extensible systems.
• AI Fluency: Leverage AI tools to accelerate development of geometry-processing pipelines. Collaborate with Data Science to ensure the Instant Quoting engine (IQE) achieves sub-second latency. Define and evangelize AI fluency standards, coaching Staff and Senior engineers.
• Problem Solving and Decision Making: Tackle deep technical coupling between marketplace and partner enterprise environments, ensuring ring-fenced data governance and enterprise-grade security.
• Scope and Impact: Lead cross-team decision-making and execute multi-quarter roadmaps to move from lightweight snippets to deep, native integrations.
• Collaboration and Communication: Act as primary technical point of contact for partner engineering teams, align internal teams on vision, and mentor engineers through design reviews.
• Operational Excellence: Own the reliability, monitoring, and security of integration microservices.

What You'll Bring to Xometry

• 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
• Track record of introducing architectural patterns and building enterprise-grade integrations
• Bachelor’s in Computer Science, Engineering, or a related field, or equivalent practical experience

Bonus Qualifications

• CAD/PLM domain expertise (e.g., Dassault/SolidWorks, Autodesk, or similar)
• 3D geometry background (B-Rep, mesh formats, 3D modeling workflows)
• Marketplace engineering experience in e-commerce, fintech, or B2B marketplaces
• Security mindset and experience building dedicated-tenant or ring-fenced enterprise solutions