Senior Full-Stack Engineer

Senior Full-Stack Engineer for High-Traffic E-commerce Platform

EX Squared LATAM connects top engineering talent across Latin America with high-impact digital products. We are seeking 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. We require a true full-stack expert with strong frontend and backend skills, specifically experience integrating Shopify within a modern web architecture.

What You'll Do

• Own and implement complex frontend features using React (and modern frameworks), emphasizing performance, accessibility, and maintainability.
• Build and maintain backend APIs and services to support frontend functionality and integrations.
• Integrate frontend applications using 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 regarding 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 You'll Bring (Required Skills & Experience)

• 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 with PHP/Laravel, Node.js, or similar backend stacks).
• Experience working with Shopify, preferably integrating custom storefronts via APIs (Shopify is important, but not the core skill).
• 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.

What We Offer

• Competitive USD compensation.
• 100% remote work from anywhere in Latin America.
• Flexible schedules and a people-first culture.
• Opportunities for continuous learning and professional growth.
• The chance to work on global e-commerce platforms with modern technologies.