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 directly within design environments.

*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 the discovery, architectural design, and adoption of our flagship embedded partner integration. Introduce best practices for native 3D geometry data flows and ensure extensible, scalable systems delivering real-time AI insights.
• AI Fluency: Leverage AI tools to accelerate geometry-processing pipelines and collaborate with Data Science to achieve sub-second latency for quoting engines. Define and evangelize AI fluency standards, coaching Staff and Senior engineers.
• Problem Solving and Decision Making: Address complex coupling between Xometry’s marketplace and enterprise software environments. Select methods for ring-fenced data governance and "one-click" order placement within enterprise security constraints.
• Scope and Impact: Lead cross-team decision-making, execute multi-quarter roadmaps, and transition lightweight integrations into deep native embeds.
• Collaboration and Communication: Act as the primary technical point of contact for partner engineering teams. Mentor senior and mid-level engineers through complex design reviews.
• Operational Excellence: Own the reliability, security, monitoring, and alerting of integration microservices.

What You'll Bring

• 8–12+ years of professional software development experience, with a track record of leading complex, multi-quarter initiatives
• Deep experience 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 between disparate enterprise ecosystems
• Proven track record of introducing architectural patterns adopted across teams and building enterprise-grade integrations
• Bachelor’s in Computer Science, Engineering, or a related field, or equivalent practical experience

Nice to Have

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