Senior Python Engineer, AI

At eBay, we're more than a global ecommerce leader — we’re changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. We’re committed to pushing boundaries and leaving our mark as we reinvent the future of ecommerce for enthusiasts.Our customers are our compass, authenticity thrives, bold ideas are welcome, and everyone can bring their unique selves to work — every day. We're in this together, sustaining the future of our customers, our company, and our planet.Join a team of passionate thinkers, innovators, and dreamers — and help us connect people and build communities to create economic opportunity for all.About the team and the role:WHI Solutions, Inc., an eBay company, operates Nexpart, a B2B marketplace built for professional automotive and truck parts businesses. Nexpart plays a critical role in helping customers efficiently source and purchase the parts they need to keep their operations running smoothly and serve their own customers with speed and confidence.The Nexpart engineering team builds and evolves the technology behind this marketplace. We are seeking a Senior Python Engineer, AI to help design, develop, and maintain scalable backend services, integrations, and platform capabilities that support critical business workflows and ongoing product innovation.We are seeking an engineer with strong Python backend experience and a track record of building reliable, scalable services. In this role, you will work with cross-functional partners to develop practical solutions that support critical workflows and improve the performance and resilience of the platform.What you will accomplish: Define technical requirements in partnership with product, business, and engineering stakeholdersDesign, develop, and maintain Python-based applications & services that power core platform workflowsBuild and integrate scalable APIs and microservices for internal and external consumersOwn backend system design for service reliability, scalability, maintainability, and operational excellenceOptimize performance using distributed technologies (e.g., caching, message queues, event-driven architectures)Implement robust observability (logging, tracing, metrics), troubleshoot production issues, and improve system resiliencyParticipate in code reviews as both a contributor and reviewer; contribute to engineering standards and best practicesCollaborate closely with development, QA, and business teams to deliver high-quality releasesCreate and maintain system and technical documentation as neededLeverage AI-powered development tools to improve productivity, code quality, and delivery speedApplied AI/LLM Focus Build and productionalize LLM-enabled features (e.g., workflow automation, intelligent routing, summarization, extraction)Design tool/function-calling services and orchestration layers for multi-step tasksImplement RAG-style retrieval patterns (embeddings, vector search, ranking) where it improves reliability and accuracyDevelop evaluation and quality frameworks for AI outputs (offline evals, regression tests, safety/reliability checks)Collaborate on responsible AI practices: guardrails, data handling, deterministic behaviors, and auditabilityWhat you will bring:BA/BS in Computer Science or a related field, or equivalent practical experience5+ years of professional Python development experience in production environmentsStrong experience building asynchronous, API-driven microservices (e.g., FastAPI, asyncio)Solid understanding of scalable backend architectures and service-to-service integrationsExperience with distributed systems patterns (queues, caching, pub/sub, background processing)Strong understanding of REST APIs, authentication/authorization, and secure system designExperience with CI/CD pipelines and containerized deployment workflowsStrong familiarity with Git and modern version control workflowsExcellent English communication skills, both written and verbalAbility to work effectively in cross-functional, fast-paced environmentsPreferred Qualifications:Experience integrating LLM APIs in production and building robust, testable AI-enabled servicesFamiliarity with prompt design, structured outputs, tool/function calling, and conversation/workflow state managementExperience with embeddings, vector databases, retrieval pipelines, and/or ranking approachesExperience building AI evaluation harnesses (golden datasets, regression testing, quality metrics)Exposure to ML concepts relevant to applied product systems (classification, extraction, ranking, personalization)Experience with real-time or conversational interfaces (chat and/or voice) and streaming systemsProficiency in Spanish (or other major marketplace languages) to help evaluate and validate multilingual AI outputsExperience supporting high-traffic, consumer-facing applicationsWhy You’ll Love Working HereBuild backend systems that support a global marketplace at scaleWork on high-impact platform capabilities that increasingly leverage LLM/AI/MLOpportunity to influence technical direction and architectureA culture that values innovation, ownership, and continuous learningCompetitive compensation and comprehensive benefitsAdditional DetailsThe base pay range for this position is expected in the range below:$118,800 - $205,600Base pay offered may vary depending on multiple individualized factors, including location, skills, and experience. The total compensation package for this position may also include other elements, including a target bonus and restricted stock units (as applicable) in addition to a full range of medical, financial, and/or other benefits (including 401(k) eligibility and various paid time off benefits, such as PTO and parental leave). Details of participation in these benefit plans will be provided if an employee receives an offer of employment.If hired, employees will be in an “at-will position” and the Company reserves the right to modify base salary (as well as any other discretionary payment or compensation program) at any time, including for reasons related to individual performance, Company or individual department/team performance, and market factors.Remote roles are not eligible for U.S. visa sponsorship.eBay is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, sex, sexual orientation, gender identity, veteran status, and disability, or other legally protected status. If you have a need that requires accommodation, please contact us at View email address on click.appcast.io. We will make every effort to respond to your request for accommodation as soon as possible. View our accessibility statement to learn more about eBay's commitment to ensuring digital accessibility for people with disabilities. It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.We use cookies to enhance your experience and may use AI tools for administrative tasks in the hiring process. To learn how we handle your personal data and use AI responsibly, please visit our Talent Privacy Notice, Privacy Center and AI Hiring Guidelines.Job SummaryJob number: R0073091Profession: Engineering