Principal Software Engineer

Xometry • Waltham, MA

22d • $200,000 - $225,000 • Hybrid

About The Position

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. This is not a standard plug-in project; 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. Your work will enable a "science fiction speed" workflow where designers receive real-time manufacturability and pricing feedback on native 3D geometry without ever leaving their primary design environment.

Requirements

• 8–12+ years of professional software development experience, with a proven track record of leading complex, multi-quarter initiatives
• Deep experience in our stack: Python (backend services, APIs), React/TypeScript (embedded UIs), and AWS cloud infrastructure
• Significant experience with system architecture, microservices design, and distributed systems, specifically those involving high-volume data exchange between disparate enterprise ecosystems
• A track record of introducing architectural patterns adopted across multiple teams and building "enterprise-grade" integrations that go beyond simple API wrappers
• Bachelor’s in Computer Science, Engineering, or a related field, or equivalent practical experience

Nice To Haves

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

Responsibilities

• Lead the discovery, architectural design, and adoption of our flagship embedded partner integration.
• Introduce best practices for handling native 3D geometry data flows and ensure our systems are extensible, scalable, and capable of delivering real-time AI insights at the moment of design.
• Leverage AI tools to accelerate the development of geometry-processing pipelines and collaborate with our Data Science team to ensure the "IQE" (Instant Quoting) engine performs with sub-second latency within the partner application UI.
• Define and evangelize the organization's AI fluency standards, coaching Staff and Senior engineers on integrating AI tooling into architecture, design, and development workflows to drive measurable productivity and quality outcomes.
• Tackle complex issues involving deep technical coupling between Xometry’s marketplace and our partner's enterprise software environment.
• Exercise judgment in selecting the right methods for ring-fenced data governance and "one-click" order placement within enterprise-grade security constraints.
• Lead cross-team decision-making and execute multi-quarter roadmaps.
• Act as the primary technical point of contact for our partner's engineering teams.
• Motivate internal Xometry teams to embrace the vision of a "unified digital thread" and mentor senior and mid-level engineers through complex design reviews.
• Own the reliability and security of the integration microservices, ensuring that "click-to-buy" functionality is bulletproof and that monitoring/alerting covers the unique lifecycle of enterprise PLM transactions.

Benefits

• 401(k) match
• medical, dental and vision insurance
• life and disability insurance
• generous paid time off including vacation, sick leave, floating and fixed holidays
• maternity and bonding leave
• EAP
• other wellbeing resources

What This Job Offers

• Job Type: Full-time
• Career Level: Principal