Senior Frontend Engineer

Amarina Search Partners•New York, NY

3d•Hybrid

About The Position

Our client is hiring a Senior Frontend Engineer to be a technical anchor for their Marketplace web rewrite program. You’ll lead the rebuild of their highest-traffic journeys and help set the frontend patterns and standards the team will reuse across the site for years. This is a Senior role with Staff-leaning scope. They are intentionally building levels gradually, and they expect this hire to grow into Staff as they expand cross-team influence and ownership. The base salary range is $170,000–$210,000, plus equity, commensurate with experience. The tech stack includes Frontend: Next.js (App Router), React, TypeScript, Tailwind, shadcn/ui; Testing: Playwright; Observability: Datadog. Backend context: Ruby on Rails and Node.js on AWS, with Postgres and MongoDB.

Requirements

7+ years building production web applications (or equivalent senior-level experience).
Deep React expertise and strong command of modern frontend architecture, especially in Next.js-style SSR/SPA hybrids.
Proven experience leading rewrites or major migrations of high-traffic surfaces with measurable results (Core Web Vitals, SEO, conversion, reliability).
Strong technical judgment and ability to lead ambiguous projects from scoping through rollout and measurement.
High engineering bar: strong testing discipline, observability mindset, and maintainable code.
Ability to mentor and raise the bar for a team through clear communication and technical leadership.

Nice To Haves

Expectation to grow into Staff by expanding scope from owning SRP/DLP to setting org-wide frontend standards, influencing adjacent teams, and leading additional high-impact surfaces as the rewrite program scales.

Responsibilities

Own major initiatives end-to-end across our highest-traffic surfaces, starting with Search Results (SRP) and Details (DLP), with clear goals around Core Web Vitals, SEO, and conversion.
Lead technical design for large changes (RFCs/design docs), drive alignment with Product/Design, and make pragmatic tradeoffs that stick.
Define and implement reusable patterns in a Next.js App Router codebase (routing/data fetching, caching strategy, component architecture, error handling, analytics instrumentation).
Raise the quality bar through standards, reviews, and mentorship, helping a junior-leaning team level up quickly.
Improve developer velocity by shaping tooling and practices (testing strategy with Playwright, observability with Datadog, CI hygiene).
Partner with backend engineers on API contracts to improve frontend performance and iteration speed.