Web Security Frontend Engineer - Mercado Pago
Core
Design and scale innovative, secure web systems and SDKs that protect sensitive logic and prevent reverse engineering for Mercado Pago's e-commerce and financial services.
Role type
Senior IC web security frontend engineer
Builds
wonder-sdk-web (a security-critical SDK consumed by integrators and end-users)
Domain
Fintech / E-commerce / Web Security
Deliverable
production ML models
Required skills
Web security (OWASP, XSS, spoofing, validation bypass), WebAssembly, JavaScript/TypeScript, React, behavioral tracking, observability, AI tools (Claude, Codex)
Preferred skills
Experience with Android/iOS/Web security collaboration, binary analysis
Technologies
WebAssembly, React, JavaScript, TypeScript, Datadog, New Relic, Amplitude, Claude, Codex
Responsibilities
Develop and evolve the wonder-sdk-web SDK with a focus on security and reliability; Implement WebAssembly to protect sensitive logic and hinder reverse engineering; Collaborate with the WebSec team on defensive solutions using OWASP and threat analysis; Work with cross-functional teams (Android, iOS, Web, Product) on security and AI projects; Utilize AI tools to enhance productivity and code quality
Seniority
Senior, hands-on IC
