Leifer Mendez
Software Engineer at Racks Labs
Madrid, Community of Madrid, Spain
Summary
🤩
Rockstar🎓
Top SchoolLeifer Mendez is a Senior Software Engineer based in Madrid with nine years of experience building scalable web applications and platforms across fintech, customer success, and e-commerce. He specializes in JavaScript/TypeScript stacks (Angular, Qwik, Node.js) and cloud-native patterns on AWS and GCP, with a strong focus on performance, automation and testability. As an active OSS contributor and lead on integrating Vitest into the Qwik framework, he blends community-driven engineering with production-grade tooling improvements. He has led multidisciplinary teams to deliver end-to-end systems—designing decoupled API layers, Dockerized deployments, and AI-enabled lead-scoring chatbots that cut resource needs by over 40%. Comfortable shifting between front-end frameworks and back-end logic, he also creates training content and Spanish translations to grow developer adoption. Energetic and curious, he still jokes about struggling to center a DIV despite a decade of shipping software.
9 years of coding experience
8 years of employment as a software developer
PlatziIngenieria en Informatica, Programación informática, Ingenieria en Informatica, Programación informática at Instituto Universitario de TecnologiaIngenieria en Informatica, Programación informática, aplicaciones específicas, Ingenieria en Informatica, Programación informática, aplicaciones específicas at Intituto Universitario de Tecnologia
English, Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (14)
application-framework10
app-framework10
web-framework10
javascript10
nodejs10
webpages10
back-end-development10
web-content10
documentation10
testing10
vitest9
typescript-types7
typescript7
typescripts7
Programming languages (10)
Github contributions (5)
codigoencasa/builderbot
Apr 2021 - Jan 2023
🤖 Crear Chatbot WhatsApp en minutos. Únete a este proyecto OpenSource
Role in this project:
Back-end Developer
Back-end DeveloperContributions:47 releases, 22 reviews, 1056 commits in 1 year 10 months
Contributions summary:Leifer contributed to a series of commits that implemented and refined core functionality within the `builderbot` repository. The changes included updates to the core logic of the bot, specifically focusing on features such as managing and handling flows, capture and handling user inputs, handling HTTP events, and database interactions. Code changes were implemented in JavaScript.
chatbotwhatsappbotdialogflowwhatsapp-bot
QwikDev/qwik
Sep 2022 - Jan 2023
Instant-loading web apps, without effort
Role in this project:Front-end Developer
Front-end DeveloperContributions:11 reviews, 17 commits, 34 PRs in 3 months
Contributions summary:Leifer primarily contributed to the Qwik framework's documentation and starter integrations. Their work included adding new documentation entries, specifically around the Partytown starter. Additionally, the user was involved in integrating unit testing support and adding new presentation videos. They also added Spanish video translations and added support for Vitest integration.
javascript1kbframeworkhtml-firstinstant-apps
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