Senior Fullstack Engineer

Spangle AI is a fast-growing startup focused on connecting AI-led discovery to real-time conversion. They are seeking a Senior Fullstack Engineer to build their next-generation merchant experience platform, focusing on client-side SDK development and contributing to backend systems.

Responsibilities:

• 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
• 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
• 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
• Drive performance improvements through code splitting, lazy loading, image optimization, caching strategies, and runtime efficiency tuning
• Write clean, maintainable, and reusable code
• Enforce best practices for accessibility (a11y), SEO, modular architecture, and automated testing
• Contribute to data modeling, database schema design, infrastructure planning, and cloud deployment (AWS/GCP)
• Support CI/CD processes and production monitoring