Senior Fullstack Engineer — AI-Driven, Multi-Tenant Platform

SpangleAI; Bellevue (WA); Hybrid; USD 140,000 - 210,000; 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 build our next-generation merchant experience platform. You will focus on client-side SDK development, multi-tenant frontend architecture, and enterprise integrations, while contributing to backend systems and scalable deployment.

Ideal candidates are based in Seattle, the Bay Area, or Austin, with flexibility for exceptional applicants. The role emphasizes performance, accessibility, and modern rendering strategies to boost SEO and user

Qualifications

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

Responsibilities

• Client-Side Platform & SDK Development for reusable frameworks and multi-tenant frontend architecture.
• Frontend Engineering with React, Next.js, and Tailwind CSS for high-performance apps.
• API & Backend Integration with REST/GraphQL ensuring secure communication.
• Performance & Scalability optimization through code-splitting, lazy loading, caching.

Skills

JavaScript

TypeScript

CSS

React

Next.js

Tailwind CSS

Tools

RESTful APIs

GraphQL

AWS

GCP

CI/CD

Job description

SpangleAI is seeking a Senior Fullstack Engineer to build our next-generation merchant experience platform. You will focus on client-side SDK development, multi-tenant frontend architecture, and enterprise integrations, while contributing to backend systems and scalable deployment.

Ideal candidates are based in Seattle, the Bay Area, or Austin, with flexibility for exceptional applicants. The role emphasizes performance, accessibility, and modern rendering strategies to boost SEO and user