Senior Software Engineer - Node / React

SimplexNew York City, NY
Onsite

About The Position

Our client is a fast-growing, venture-backed technology company that has built a modernized Point-of-Sale (POS) platform purpose-built for the wine and liquor retail industry. Two years in, they have achieved meaningful scale — serving 150+ multi-location enterprise customers with a system that operates around the clock across multiple time zones, acting as the core platform for procurement, transactions, and reporting. They work fully in-person, 5 days a week, out of their office in the Flatiron district of New York City. Relocation assistance and visa sponsorship are not available at this time.

Requirements

  • At least 5 years of experience
  • Strong computer science and programming foundation
  • Has read Designing Data-Intensive Applications
  • Builds with the end user and longevity in mind
  • Communicates effectively to drive clarity and alignment across the organization
  • Genuinely passionate about software engineering
  • Hands-on experience with serverless architectures — comfortable designing and deploying serverless functions and event-driven systems in cloud environments (e.g., AWS Lambda, Vercel Edge Functions, or equivalent)

Nice To Haves

  • Is a craftsperson who deeply cares about the quality of their output and understands the long-term costs of shortcuts
  • Knows how to design abstractions and APIs that are a pleasure for both customers and teammates to use
  • Able to translate product requirements into technical challenges and vice versa
  • Dives deep into topics that interest them, whether that's the Node.js Event Loop or how virtual memory works at the OS level

Responsibilities

  • Build and own new user-facing features end-to-end, from database models to UI components
  • Continuously improve observability across existing systems — analytics, monitoring, and alerting
  • Collaborate with product and engineering to architect key differentiators, including embedded fintech products and AI agents to help merchants manage their stores
  • Build CI/CD pipelines and developer tooling (e.g., feature environments) that increase development velocity
  • Help shape engineering processes to support building a world-class product

Benefits

  • Meaningful equity
  • Unlimited PTO
  • Full benefits package: medical, dental, vision, 401(k), transportation, and more
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