UI Engineer

COMPANY OVERVIEW TENEX is an AI-native, automation-first, built-for-scale Managed Detection and Response (MDR) provider. We are a force multiplier for defenders, helping organizations enhance their cybersecurity posture through advanced threat detection, rapid response, and continuous protection. Our team is composed of industry experts with deep experience in cybersecurity, automation and AI-driven solutions. Backed by leading investors, we are rapidly growing and seeking top talent to join our mission of revolutionizing the AI-Native MDR landscape. We’re a fast growing startup backed by industry experts and top tier investors led by Crosspoint Capital Partners and also backed by Shield Capital, DTCP (formerly Deutsche Telekom Capital Partners), Deepwork Capital, and the Florida Opportunity Fund. Seed round led by Andreessen Horowitz (a16z). As an early employee, you’ll play a meaningful role in defining and building our culture. Get in on the ground floor. We’re a small but well-funded team that just raised a substantial round – joining now comes with limited risk and unlimited upside. We’re a fast growing startup backed by industry experts and top tier investor Andreessen Horowitz. As an early employee, you’ll play a meaningful role in defining and building our culture. Get in on the ground floor. We’re a small but well-funded team that just raised a substantial round – joining now comes with limited risk and unlimited upside. Culture is one of the most important things at TENEX.AI http://TENEX.AI—explore our culture deck at culture.tenex.ai http://culture.tenex.ai to witness how we embody it, prioritizing the irreplaceable collaboration and community of in-person work. As a UI Engineer at TENEX, you will help build a product experience that is fast, intuitive, and trustworthy—because security, clarity and speed are everything. You’ll work closely with the Principal UI Engineer, Backend/Platform Engineering, and Analysts to deliver polished workflows for security practitioners. This role is ideal for a high-ownership engineer who treats product development as an iterative process of refining the live application. You will go beyond implementing artifacts to ensure the user experience feels intentional and coherent, not just functional. This role will be hybrid in one of our 3 locations: San Jose, CA; Overland Park, KS; or Sarasota, FL. JOB RESPONSIBILITIES - Take rough UI flows and refine them into a cohesive, high-trust product experience. - Build and maintain reusable UI patterns (layout, navigation, tables, filters, forms, modals). - Implement robust data-fetching/server-state patterns (pagination, caching, background refresh, optimistic updates, error handling). - Shape API contracts with backend engineers to keep frontend implementation clean and scalable. - Raise the bar on UI correctness: loading/empty/error states, edge cases, responsive behavior, accessibility. - Improve frontend architecture, LLM, and team practices (component conventions, Claude Code skills, review standards, performance budgets). - Own the “product feel”: micro-interactions, latency masking, and interaction details that make the product feel trustworthy. QUALIFICATIONS - 3+ years building modern web UIs with React + TypeScript. - Strong CSS fundamentals (Tailwind experience a plus). - Experience shipping data-heavy workflows (lists/detail, filtering, sorting, pagination). - Strong product taste: you notice rough edges, unclear hierarchy, confusing flows—and you fix them. - You can explain tradeoffs clearly and collaborate tightly with engineers and stakeholders. - Evidence of shipped work (portfolio, live links, or walkthrough of real product contributions). DESIRED (NICE-TO-HAVES) - Design systems/component library work (Storybook, design tokens). - Deep TanStack Query experience. - Performance work in data-dense views (virtualization, re-render traps, bundle size). - Real-time UI patterns (polling, websockets, streaming updates). - Enterprise