Senior Fullstack Engineer - AI-Driven Merchant Platform

SpangleAI; San Francisco (CA); On-site; USD 180,000 - 250,000; Full time

Benefits offered by this job

Health, dental and vision insurance

401(k)

Unlimited PTO

Job summary

SpangleAI is seeking a Senior Fullstack Engineer to advance our merchant experience platform. You will own client-side SDKs and multi-tenant frontend architecture while collaborating with backend teams on data modeling and deployment.

The role emphasizes high-performance React/Next.js development, modern rendering strategies, accessibility, and scalable cloud infrastructure (AWS/GCP). Based in SF/Bay Area or Seattle preferred, with flexibility for exceptional candidates.

Qualifications

• 5+ years of professional software development experience.
• Proven experience building production-grade web apps in multi-tenant/enterprise environments.
• Experience developing distributed client-side SDKs or embedded commerce tools is strongly preferred.

Responsibilities

• Design and implement reusable, distributed JavaScript/CSS SDK frameworks for merchant integration.
• Develop high-performance frontends using React, Next.js, and Tailwind CSS with SSR/SSG/ISR.
• Partner with backend engineers to integrate frontend with RESTful APIs and GraphQL.
• Optimize performance with code splitting, lazy loading, caching, and SEO.
• Ensure accessibility, SEO, modular architecture, and automated testing.
• Support data modeling, infrastructure planning, and cloud deployment (AWS/GCP).

Skills

5+ years of experience

Enterprise web apps

Distributed client-side SDKs

Tools

JavaScript

TypeScript

CSS

React

Next.js

Tailwind CSS

REST APIs

GraphQL

AWS/GCP

Job description

SpangleAI is seeking a Senior Fullstack Engineer to advance our merchant experience platform. You will own client-side SDKs and multi-tenant frontend architecture while collaborating with backend teams on data modeling and deployment.

The role emphasizes high-performance React/Next.js development, modern rendering strategies, accessibility, and scalable cloud infrastructure (AWS/GCP). Based in SF/Bay Area or Seattle preferred, with flexibility for exceptional candidates.