Principal Software Engineer

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, responsible for extracting Xometry’s core AI engines (DFM and IQE) and natively embedding them into our partner's core digital ecosystems. This role requires a hybrid schedule (3 days a week) at our North Bethesda, MD or Waltham, MA office location.

Responsibilities

Lead discovery, architectural design, and adoption of flagship embedded partner integration; Introduce best practices for handling native 3D geometry data flows and ensure systems are extensible, scalable, and capable of delivering real-time AI insights; Leverage AI tools to accelerate geometry-processing pipelines and collaborate with Data Science team to ensure IQE engine performs with sub-second latency; Define and evangelize organization's AI fluency standards, coaching Staff and Senior engineers; Tackle complex issues involving deep technical coupling between Xometry's marketplace and partner's enterprise software; Lead cross-team decision-making and execute multi-quarter roadmaps; Act as primary technical point of contact for partner's engineering teams; Mentor senior and mid-level engineers through complex design reviews; Own reliability and security of integration microservices

Requirements

8–12+ years of professional software development experience; proven 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 involving high-volume data exchange between disparate enterprise ecosystems; track record of introducing architectural patterns adopted across multiple teams and building enterprise-grade integrations beyond simple API wrappers; Bachelor’s in Computer Science, Engineering, or a related field, or equivalent practical experience

Nice to have

CAD/PLM Domain Expertise: Broad experience working within enterprise engineering software ecosystems (e.g., Dassault/SolidWorks, Autodesk, or similar major platforms); 3D Geometry Background: Understanding of B-Rep, mesh formats, and the complexities of 3D modeling workflows; Marketplace Engineering: Experience in e-commerce, fintech, or B2B marketplaces where 'click-to-buy' precision is critical; Security Mindset: Experience building dedicated-tenant or ring-fenced solutions for high-security enterprise clients

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; bonus; equity