Senior Fullstack Engineer - Enterprise Frontend & SDKs

SpangleAI; Austin (TX); On-site; USD 160,000 - 210,000; Full time

Benefits offered by this job

Health insurance

Dental insurance

Vision insurance

401(k)

Unlimited PTO

Equity

Job summary

SpangleAI is seeking a Senior Fullstack Engineer with deep client-side expertise to build our next-gen merchant experience platform. You will lead client-side SDK development, multi-tenant frontend architecture, and enterprise integration frameworks while influencing backend systems and deployment strategies.

The role offers flexibility for exceptional candidates and is based in the US, with Seattle, Bay Area, or Austin as preferred hubs.

Qualifications

• 5+ years of professional software development experience.
• Proven 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: Design and implement reusable, distributed JavaScript/CSS SDK frameworks for merchant integration across diverse retail environments.
• Frontend Engineering: Develop high-performance web apps using React, Next.js, and Tailwind CSS with SSR/SSG/ISR strategies.
• API & Backend Integration: Collaborate with backend engineers to integrate frontend logic with RESTful APIs and GraphQL services.
• Performance & Scalability Optimization: Improve performance with code splitting, lazy loading, caching strategies, and runtime tuning.
• Code Quality & Standards: Write clean, accessible, modular code and enforce best practices including automated testing.
• Backend & Infrastructure Support: Contribute to data modeling, infrastructure planning, and cloud deployment (AWS/GCP).

Skills

JavaScript

TypeScript

CSS

React

Next.js

Tailwind CSS

RESTful APIs

GraphQL

AWS/GCP

Tools

Frontend SDKs

Multi-tenant architecture

Performance optimization

Job description

SpangleAI is seeking a Senior Fullstack Engineer with deep client-side expertise to build our next-gen merchant experience platform. You will lead client-side SDK development, multi-tenant frontend architecture, and enterprise integration frameworks while influencing backend systems and deployment strategies.

The role offers flexibility for exceptional candidates and is based in the US, with Seattle, Bay Area, or Austin as preferred hubs.