Fullstack Engineer

Scion Technology has been engaged to conduct a search for an experienced Fullstack Engineer for our client, an AI infrastructure startup company. This is a full-time position based in San Francisco, CA. POSITION OVERVIEWOur client is seeking a backend-learning full-stack engineer to own features end-to-end. Will help build and scale enterprise-grade infrastructure powering AI-driven applications. In this role you will design and own complex, multi-tenant backend system, develop reliable integrations with external platforms, and ensure services remain scalable, observable and resilient in production.PERKSOwn products end-to-end with meaningful influence over architecture, technical direction, and customer outcomes.Work directly with enterprise customers, turning complex real-world challenges into scalable product capabilities.Accelerate your growth by collaborating closely with experienced engineers in a fast-paced, high accountability environment.RESPONSIBILITIESBuild the backend systems powering the agent-evaluation and continuous-improvement platformImprove the data models behind evaluation datasets, experiment runs, agent traces, - knowledge versions, findings, and customer-defined quality criteriaOwn enterprise integrations across their full lifecycle: auth, OAuth, webhooks, incremental syncs, backfills, rate limits, schema changes, retries, monitoring, and production supportOwn features from technical design and implementation through deployment, monitoring, customer feedback, and iterationWork directly with customers when needed — understand their systems, diagnose failures, and turn one-off requirements into reusable product capabilitiesQUALIFICATIONS 3–6+ years building and operating production softwareStrong backend skills with the ability to ship across the full stackProduction TypeScript and Node.js or BunStrong PostgreSQL; experience with Redis, job queues, background workers, or -workflow systemsAPIs, integrations, webhooks, and data pipelines for production-grade, multi-tenant softwareFamiliarity with observability, distributed systems, and agent-evaluation conceptsCOMPENSATION & BENEFITSThis direct hire position offers a salary of $160,000-180,000 annually. They offer a robust benefits package that includes comprehensive medical, dental, and vision coverage, along with additional perks.ABOUT OUR FIRMScion Staffing is a national award-winning staffing firm! Since 2006, we have had the pleasure of successfully placing thousands of talented professionals with amazing career opportunities. Through our innovative team building and recruiting solutions, we bridge the gap in executive leadership searches, direct hire recruiting, interim leadership placement, and temporary professional staffing. We are proud to be part of the Forbes lists of the Best Recruitment Firms and the Best Executive Search Firms in America. Additionally, Scion has been recognized as a ClearlyRated Best of Staffing firm as well as a top recruitment firm by The Business Times. Additional information about our firm can also be found online.Scion Staffing, Inc. is an equal opportunity employer and service provider and does not discriminate based on race, religion, gender, gender identity, national origin, citizenship status, sexual orientation, disability, political affiliation or belief, or any other protected class. We are committed to the principles of Equal Opportunity Employment and are dedicated to making employment decisions based on merit and value, for ourselves, our client companies, and the candidates we represent. For opportunities located in a region that have enacted fair chance, arrest or conviction-based employment ordinances, Scion Staffing proactively follows the enacted guidance and considers for employment all qualified applications with arrest and conviction records. We engage in socially conscious business practices and believe that diverse, inclusive, and non-biased talent and recruitment processes are foundational to the success of Scion as well as every client organization with whom we partner.