Staff Software Engineer (Frontend), Infra

Harmonic is the startup discovery engine.

It pains us to see great startup opportunities consistently go undiscovered every day. And it doesn't happen due to lack of talent, but lack of signal. 

We're fixing that by mapping the entire startup landscape and building the tools that put the right companies in front of the right people at the right time. Investors, corporate development, and GTM teams at Anthropic, OpenAI, General Catalyst, Kleiner Perkins, Brex and Notion use us to find breakout companies before they're obvious and turn that discovery into action. Whether that's a check, an acquisition, partnership or won business. 

We’re growing revenue at a rate of 100%+ annually and powering thousands of workflows. Backed by $30M from Craft, Floodgate, and Sozo Ventures, we're committed to using frontier technology to shine a light on private markets. If that resonates, let's talk. 

Infrastructure 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."

• Reliability: Our users depend on us for critical investment decisions. When they are 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.

• 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.

• 7+ years building frontend applications at scale.
• Deep expertise in React, TypeScript, and modern build tooling.
• Track record of fixing production performance issues at scale.
• Strong opinions on frontend architecture, backed by experience.
• NYC-based, in office 3 days/week.

• Experience with discovery systems, search use cases, recommendation systems (CRM, ATS, etc.), or anything that helps index, document, and make data available for use.
• Exposure to venture capital, private markets, or company intelligence data.

$210-280k Salary + Equity depending on the level

Here’s our interview process:

1. Recruiter Screening: 20 mins
2. Technical Screening (Debugging): 45 mins
3. Technical Screening (System Design): 45 mins
4. Jam Session: 2 hours 
5. Behavioral interviews with our Head of Engineering and CEO: 30 mins each
6. References