EX Squared LATAM is looking for a Senior Full-Stack Engineer to join a cross-functional team supporting a high-traffic e-commerce platform for a U.S.-based, mission-driven company. You will own and implement complex features across the full stack, with a strong focus on performance and scalability.

What You'll Do

Own and implement complex frontend features using React and modern frameworks, with strong emphasis on performance, accessibility, and maintainability.
Build and maintain backend APIs and services, supporting frontend functionality and integrations.
Integrate frontend applications with Shopify Storefront APIs and internal backend systems.
Work across the stack to deliver scalable, high-quality e-commerce experiences in a high-traffic environment.
Collaborate closely with Product, Design, Frontend, and Backend teams to ship polished, user-focused features.
Drive best practices around code quality, modular architecture, performance optimization, and testing.
Break down complex initiatives into incremental, shippable deliverables.
Contribute to architectural discussions and help improve engineering standards across the team.
Mentor other engineers through code reviews and technical collaboration.

What We're Looking For

5+ years of experience building complex web applications as a Full-Stack Engineer.
Strong expertise in modern frontend development, particularly with React and component-based architectures.
Solid backend experience building and maintaining APIs.
Experience working with Shopify, preferably integrating custom storefronts via APIs.
Comfort working in systems that span multiple backends and services.
Strong understanding of scalable architecture, performance, and maintainable codebases.
Experience improving existing codebases and engineering processes.
Ability to explain technical decisions, trade-offs, and refactoring approaches clearly.
Experience collaborating in remote, cross-functional teams.
Advanced English proficiency (C1), comfortable communicating with U.S.-based teams.