Staff Frontend Engineer, Infastructure

NxT Level•New York, NY

3d•Hybrid

About The Position

Our client is building a company intelligence platform that helps investors, operators, and deal teams discover, analyze, and act on millions of startup and company signals in real time. Their product supports complex search, workflow automation, market discovery, and collaboration across large-scale company datasets. As usage grows, the frontend needs to move from “it works” to “it works flawlessly.” This is an opportunity to join a high-performing engineering team at an important inflection point and help build the frontend infrastructure that makes the product faster, more reliable, and easier for other engineers to build on. Our client is hiring a Senior Frontend Infrastructure Engineer to improve the reliability, performance, and scalability of their core frontend platform. This person will focus on the systems, patterns, and architecture that power a complex frontend used by hundreds of users running sophisticated searches across millions of companies, analyzing large datasets, building workflows, and collaborating on deal flow. This is a high-impact role for an engineer who loves React, TypeScript, frontend architecture, performance optimization, observability, and building the foundation that helps product teams ship faster without breaking critical user workflows.

Requirements

7+ years of experience building frontend applications at scale
Deep expertise in React, TypeScript, and modern frontend build tooling
Strong track record improving production frontend performance at scale
Experience building reliable, data-heavy, user-facing applications
Strong opinions on frontend architecture, supported by real production experience
Experience with state management, error handling, testing strategies, and frontend observability
Ability to improve developer experience through better abstractions and engineering patterns
Strong communication skills and the ability to mentor other engineers
Comfort working in a fast-moving, high-ownership engineering environment
NYC-based and able to work in office 3 days per week

Nice To Haves

Experience with discovery systems, search products, recommendation systems, CRM platforms, ATS platforms, or large-scale data indexing workflows
Experience building products that help users search, organize, document, and act on complex datasets
Exposure to venture capital, private markets, company intelligence, market research, or investment workflows
Experience building frontend infrastructure for data visualization, analytics, or collaborative workflow products

Responsibilities

Improve frontend reliability across core product workflows
Build robust error boundaries, state management patterns, and data consistency systems
Optimize frontend performance for large datasets, complex filters, and data-heavy views
Implement virtualization for tables and views with thousands of rows
Improve bundle size, render performance, page load speed, and overall user experience
Build frontend monitoring and observability to catch issues before users do
Establish testing strategies that reduce regressions and improve engineering confidence
Create reusable abstractions, patterns, and tooling that help engineers ship faster
Drive technical decisions across frontend architecture and infrastructure
Mentor engineers through complex migrations, performance work, and reliability improvements
Partner with product and engineering teams to make critical workflows faster, smoother, and more resilient