Frontend Engineer

Role Description

As a Frontend Engineer at Oneleet, you'll own the user experience layer of our cybersecurity platform. You'll build the dashboards, workflows, and data visualizations that security teams use day-to-day — turning complex underlying data into clear, actionable interfaces.

This is a hands-on, React-focused role at a Series A startup. You'll partner closely with our Product Designer and PM on a mock-up-first workflow — taking mock-ups and shipping them quickly without losing design fidelity. You'll extend our existing component library, push back when patterns don't hold up, and work directly with customers to validate what you ship.

Working primarily in TypeScript and React, you'll help us ship a polished product against named competitors.

Key Responsibilities

• Build UI components and full pages in React/TypeScript across the platform
• Extend and maintain our existing component library, ensuring consistency across the product
• Implement complex triage, filtering, and workflow flows that handle high-volume data
• Build data visualizations for dashboards, posture views, and reporting
• Optimize frontend performance — list virtualization, smart pagination, responsive interactions on large datasets
• Implement real-time updates where they matter
• Partner with the Product Designer on mock-up reviews and on extending the component library
• Work with fullstack and backend engineers to shape the APIs that power the UI
• Build feedback loops and analytics that capture user interactions with new features
• Work directly with customers and design partners to validate UX and iterate quickly

Qualifications

• 5+ years of frontend engineering experience with deep expertise in React and TypeScript
• Strong track record of shipping production UIs in modern frameworks
• Hands-on experience working inside mature component libraries and design systems
• Experience with state management, performance optimization, and complex data fetching patterns
• Comfortable with data visualization libraries
• Strong eye for design fidelity — comfortable pushing back on patterns or mock-ups when something doesn't hold up
• Solid debugging skills in the browser and across the network boundary
• Experience gathering requirements from users and translating feedback into UI improvements
• Strong communication skills and comfort working directly with customers and design
• Scrappy; prior startup experience and not afraid to get their hands dirty
• Pragmatic; knows how to ship fast without unnecessarily complicating things
• Experience in (and thrives in) a fast-moving, start-up engineering environment

Bonus

• Background in cybersecurity or developer tools
• Experience with real-time data updates and WebSocket implementations
• Experience designing or building accessible (WCAG-conformant) interfaces
• Experience with end-to-end testing frameworks

Benefits

• Comprehensive health & wellness benefits
• 20 days PTO per year, plus 8 floating holidays
• Remote work culture
• Team off-sites in stunning places (Amsterdam, Italy, etc.)
• Competitive compensation & equity