Staff Software Engineer - Frontend Platform

About Harmonic Every day, thousands of new companies are founded. Most will never matter. A few will change everything. Harmonic helps startups get discovered by the investors, customers, partners, and talent that will change the trajectory of their company. We are a living, breathing record of the innovation economy. Allowing our customers to understand who matters, what's happening, where to look next, and how to make decisions. We're doubling revenue annually, profitable, and backed with $30M from Craft, Floodgate, Sozo Ventures, and plenty of other industry leaders. We're committed to ensuring hundreds of billions of dollars find the right founders, so the innovations that matter most flourish. If that resonates, let's talk. About the Team Our Infrastructure team powers Harmonic's ability to process millions of startup signals in real-time. While Flow builds workflows and Discovery surfaces insights, Infrastructure makes it all fast, reliable, and scalable. We're at an inflection point. Our frontend serves hundreds of users who run complex queries across millions of companies, build sophisticated searches, and collaborate on deal flow. As we scale, we need to transform our frontend from "it works" to "it works flawlessly." Our infrastructure priorities: Reliability. Our users depend on us for critical investment decisions. When they're analyzing deals or presenting to partners, nothing can break. We need robust error handling, graceful degradation, and resilient core flows. Performance. Large datasets currently strain our frontend. Views with thousands of rows need to render smoothly. Complex filters need to respond quickly. Data visualizations need to load without blocking the UI. Enabling developers. Once we've nailed reliability and performance, the right infra multiplies our team's impact. Better abstractions and clearer patterns let engineers ship with confidence. Who You Are You have 7+ years building frontend applications at scale. You have deep expertise in React, TypeScript, and modern build tooling. You have a track record of fixing production performance issues at scale. You have strong opinions on frontend architecture, backed by real experience shipping. Bonus: you've worked on discovery systems, search, or recommendation systems (CRM, ATS, or similar), or anything that helps index, structure, and surface data for use. Bonus: you have exposure to venture capital, private markets, or company intelligence data. What You'll Do Fix core reliability issues: error boundaries, state management, data consistency. Optimize performance: virtualization for large datasets, bundle optimization, render performance. Build monitoring and observability to catch issues before users do. Establish testing strategies that prevent regressions. Create abstractions and patterns that help engineers ship faster without breaking things. Drive technical decisions and mentor the team through complex migrations. Our Stack Interview Process Recruiter Screening: 30 mins Technical Screening (Debugging): 45 mins Technical Screening (System Design): 45 mins Jam Session: 2 hours Behavioral interviews with our Head of Engineering and CEO: 30 mins each References We are an Equal Opportunity Employer committed to recruiting, hiring and promoting qualified people of all backgrounds regardless of gender, race, color, creed, national origin, religion, age, marital status, pregnancy, physical or mental disability, sexual orientation, gender identity, military or veteran status, or any other basis protected by federal, state, or local law.