About SpangleAI Launched in 2025, Spangle AI is the agentic conversion layer connecting AI-led discovery to real-time conversion. Backed by Madrona.
About the role
We are seeking exceptional Senior Fullstack Engineers with deep expertise in client-side development to build our next-generation merchant experience platform.This role primarily focuses on: Client-side SDK development, Multi-tenant architecture, Enterprise integration frameworks and High-performance frontend systems. You will also contribute strategically to backend systems, including data modeling, infrastructure
What they're looking for
- API & Backend Integration: Partner with backend engineers to integrate frontend logic with RESTful APIs and GraphQL services. Ensure secure, resilient communication between client-side SDKs and backend systems
- Performance & Scalability Optimization: Drive performance improvements through code splitting, lazy loading, image optimization, caching strategies, and runtime efficiency tuning
- Code Quality & Standards: Write clean, maintainable, and reusable code. Enforce best practices for accessibility (a11y), SEO, modular architecture, and automated testing
- Backend & Infrastructure Support: Contribute to data modeling, database schema design, infrastructure planning, and cloud deployment (AWS/GCP). Support CI/CD processes and production monitoring
- 5+ years of professional software development experience
- Proven experience building production-grade web applications in multi-tenant or enterprise environments
More about this role
The Role
We are seeking exceptional Senior Fullstack Engineers with deep expertise in client-side development to build our next-generation merchant experience platform.This role primarily focuses on: Client-side SDK development, Multi-tenant architecture, Enterprise integration frameworks and High-performance frontend systems.
You will also contribute strategically to backend systems, including data modeling, infrastructure
planning, and scalable deployment architecture.
This role is ideally based in Seattle, the Bay Area, or Austin, with flexibility for exceptional
candidates.
- Client-Side Platform & SDK Development: Design and implement reusable, distributed JavaScript/CSS SDK frameworks that enable seamless merchant integration across diverse retail environments. Build scalable multi-tenant frontend architecture that supports enterprise-grade customization and performance.
- Frontend Engineering: Develop high-performance, scalable, and accessible web applications using React, Next.js, and Tailwind CSS. Implement modern rendering strategies (SSR, SSG, ISR) to ensure optimal SEO and performance.
- API & Backend Integration: Partner with backend engineers to integrate frontend...
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