Staff Frontend Platform Engineer – Scale & Reliability

Harmonic; New York (NY); On-site; USD 210,000 - 280,000; Full time

Job summary

Harmonic is seeking an experienced Senior Frontend Engineer to scale our frontend applications for a high-growth startup discovery engine. You will own critical reliability, performance optimizations, and frontend architecture decisions that impact hundreds of users building and analyzing complex startup signals.

You will mentor engineers, shape the frontend roadmap, and collaborate with the infrastructure and data teams to ensure fast, reliable user experiences across our discovery and

Qualifications

• 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 with real migration experience.

Responsibilities

• Fix core reliability issues: error boundaries, state management, data consistency.
• Optimize performance for large datasets and complex queries.
• Build monitoring and observability to catch issues early.
• Establish testing strategies to prevent regressions.
• Create abstractions and patterns to help engineers ship faster without breaking things.
• Drive technical decisions and mentor the team through migrations.

Skills

React

TypeScript

Frontend architecture

Performance optimization

Mentoring

Tools

Build tooling

Job description

Harmonic is seeking an experienced Senior Frontend Engineer to scale our frontend applications for a high-growth startup discovery engine. You will own critical reliability, performance optimizations, and frontend architecture decisions that impact hundreds of users building and analyzing complex startup signals.

You will mentor engineers, shape the frontend roadmap, and collaborate with the infrastructure and data teams to ensure fast, reliable user experiences across our discovery and