As a Senior Full Stack Engineer , you'll help define and build the core foundation of our product. You'll work across the stack, own key features end-to-end , and collaborate closely with founders, customers, and tech leads to shape the future of GenAI security Your Experience &Skills 4–8+ years of experience in core software engineering Experience building front end components in modern frameworks such as React, Next.js, and similar Experience designing scalable systems, APIs, and data architecture Experience shipping production software in a product-focused environment Ability to work through ambiguity and solve complex technical problems Desirable) Experience working with GenAI or ML in a professional, personal, or academic setting Desirable) Familiarity with TypeScript and the Node.js ecosystem Mindset &Fit Collaborative - thrives in a fast-paced startup environment Strong opinions, loosely held - willing to debate, iterate, and adjust Bias for action - prioritizes, ships fast, and avoids over-engineering Passionate about AI and cybersecurity Desire to have impact on all aspects of the company's success Why Join Us? Early impact : Help shape a category-defining product in GenAI security Growth & ownership : Work directly with founders and tech leads to drive innovation Cutting-edge tech : Build with LLMs, AI security, and enterprise AI adoption strategies About Opsin Opsin is a venture-backed GenAI security company, funded by top-tier investors including Race Capital . We empower enterprises to safely adopt GenAI solutions like Microsoft Copilot, Google Gemini, and other LLM-powered agents by monitoring and securing enterprise data access . Our platform ensures employees can leverage AI without exposing sensitive or over-permissioned information. Employment Type Full-Time Compensation Competitive salary, benefits, and equity Location San Jose, CA / SF Bay Area (hybrid). The team works together in person 2–3 days a week at our locations in downtown San Jose and San Ramon. In-person collaboration is key for this position. Excited to secure the future of GenAI? Join us! J-18808-Ljbffr Create a job alert for this search

Senior Stack Engineer • San Jose, CA, US

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