Reysmer Valle Ramírez

Senior Frontend Engineer @ N26

Ex-Wallapop & Mercado Libre · Design Systems · React & TypeScript

Barcelona, Catalonia, Spain · English · Spanish

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About

12+
Years of Experience
20+
Projects
1500+
GitHub Contributions

Frontend at Scale

I build and maintain high-traffic React applications for regulated fintech and large marketplaces — including N26, Wallapop, and Mercado Libre — with a focus on performance, accessibility, and maintainable architecture.

Design Systems & Testing

I work with component libraries, Storybook, and test-driven workflows (Vitest, React Testing Library, Jest) so teams ship UI with confidence and consistent quality across products.

Cross-Platform Engineering

Beyond the browser, I bring experience in iOS (Swift, UIKit) and React Native — useful when products span web and mobile or when teams need a bridge across platforms.

DevOps-Minded Delivery

I have shipped infrastructure automation, CI/CD pipelines, and containerized workflows (Docker, Kubernetes, Jenkins) — so frontend work connects cleanly to how code reaches production.

Professional Experience

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Senior Frontend Engineer
N
N26 · Full-time
Jun 2025 - Present
Barcelona, Catalonia, Spain · Hybrid

Building customer-facing frontend experiences for a European digital bank using React and TypeScript. Contributing to component-driven development with Storybook, GraphQL integration, and a testing-first approach with Vitest and React Testing Library.

  • React
  • GraphQL
  • Vitest
  • TypeScript
  • Storybook
  • +2
View more
Senior Frontend Engineer
W
Wallapop · Full-time
Nov 2022 - Jun 2025
Barcelona, Catalonia, Spain · Hybrid

Delivered frontend features for one of Europe's largest consumer marketplaces over 2+ years. Worked in a microservices environment with React, Next.js, and AWS — emphasizing test-driven development, web accessibility, and collaboration across product and platform teams.

  • Microservices
  • REST APIs
  • React
  • Storybook
  • Amazon Web Services (AWS)
  • +38
View more
Senior Frontend Engineer
M
Mercado Libre · Full-time
Oct 2020 - Jun 2021
Bogota, D.C., Capital District, Colombia · Hybrid

Built and shipped frontend capabilities for Latin America's largest e-commerce platform. Worked with React, microservices, and AWS in a high-scale product environment with strong CI/CD and observability practices.

  • Docker
  • AWS
  • Microservices
  • NestJS
  • REST APIs
  • +40
View more

Courses & Certifications

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Testing Javascript
Testing Javascript
2024

Learn the smart, efficient way to test any JavaScript application

Epic React Pro
Epic React
2025

Master React 19 with Fully Updated TypeScript Code Focused Workshops

Epic React V1 Pro
Epic React
2024

Master React 18 with JavaScript Code Focused Workshops

The Complete React Native + Hooks Course
Udemy
2023

Understand React Native with Hooks, Context, and React Navigation

Docker Fundamentals
learn.cantrill.io
2025

Docker Fundamentals

Docker and Kubernetes: The Complete Guide
Udemy
2024

Build, test, and deploy Docker applications with Kubernetes while learning production-style development workflows