Sr. Fullstack Software Engineer

Sr. Fullstack Engineer

Hybrid (NYC)

$140k - $170k Base + bonus & equity

Overvie

wA global, high‑growth technology company operating at the intersection of financial technology, consumer platforms, and digital security is expanding its engineering leadership team. The organisation builds large‑scale, consumer‑facing platforms used by hundreds of millions of users worldwide, with a strong focus on quality, long‑term maintainability, and responsible AI‑assisted development

.This role sits within a financial products marketplace that partners with major financial institutions to deliver personalised consumer experiences. The position is ideal for a senior‑level engineer who values engineering judgement, thoughtful architecture, and technical leadership over speed alone

.
Responsibiliti

• esOwn and uphold a high engineering quality bar across design reviews, code reviews, testing strategy, and production readine
• ssCollaborate closely with product, design, and engineering partners to shape solutions and evaluate technical trade‑of
• fsArchitect and build frontend‑leaning, full‑stack systems that are modular, composable, and resilient to chan
• geChampion performance, reliability, and maintainability in AI‑assisted development environmen
• tsApply functional programming principles and immutability to reduce side effects and improve system clari
• tyLead the effective use of AI agents for prototyping, refactoring, and exploration while ensuring production‑grade outcom
• esDrive a robust automated testing strategy across unit, integration, UI/component, and end‑to‑end laye
• rsProvide technical leadership through mentorship, delegation, and high‑quality code revie

ws
Must‑Have Qualificati

• onsBachelor's degree in Computer Science, Engineering, or a related fi
• eld5+ years of experience building production web applications, including senior‑level owners
• hipPrior experience operating at principal, lead, or staff engineer le
• velExpert proficiency with TypeScript and React, including server‑side rendered frameworks such as Next
• .jsStrong understanding of functional programming concepts and immutability in modern frontend syst
• emsAdvanced knowledge of automated testing strategies and CI‑driven feedback lo