Remote Backend Architect for a Scalable FinTech Platform

Worky; New York (NY); On-site; USD 120,000 - 180,000; Full time

Job summary

Affiniti is building the financial operating system for small businesses across America, and the frontend is the bridge. The NYC office anchors the team, while Canada remains a remote collaboration option for this role.

We’re seeking a backend-focused engineer with 2+ years of production experience who loves TypeScript and Node.js. You’ll own the backend architecture, ship reliable data models, and work closely with product and design to solve real customer problems at scale.

Qualifications

• 2+ years of production engineering experience.
• Early-stage startup experience strongly preferred.
• Deep fluency in TypeScript and Node.js, with real opinions about API design, data modeling, backend architecture, and system reliability.
• End-to-end ownership and strong product instincts.
• You know how to build with AI, not just use it.
• A track record building complex, data-rich products backed by systems operating under real reliability and performance constraints.
• Speed without the debt.
• High ownership.

Responsibilities

• Own the backend architecture behind our product: APIs, data models, business logic, and foundational decisions for scale, performance, and reliability.
• Drop into the full stack when needed: build frontend flows, wire React components, trace bugs from browser to database.
• Build the systems that power complex financial products with reliable data handling and integrations.
• Obsess over data integrity, API latency, failure modes, and performance edge cases.
• Partner closely with product and design to push past requirements and solve customer problems, not just the technical spec.
• Turn ambiguous user needs into clean, maintainable implementations and advocate for the user in technical decisions.

Skills

TypeScript

Node.js

API design

Data modeling

Backend architecture

System reliability

AI tooling in development

Tools

Claude Code

Codex

Job description

Affiniti is building the financial operating system for small businesses across America, and the frontend is the bridge. The NYC office anchors the team, while Canada remains a remote collaboration option for this role.

We’re seeking a backend-focused engineer with 2+ years of production experience who loves TypeScript and Node.js. You’ll own the backend architecture, ship reliable data models, and work closely with product and design to solve real customer problems at scale.