Alejandro – Typescript, JavaScript, React, experts in Lemon.io

Alejandro

From Mexico (UTC-6)flag

Full-stack Web Developer|Middle-to-senior
Back-end Web Developer|Middle-to-senior
Front-end Web Developer|Middle-to-senior

Alejandro – Typescript, JavaScript, React

Alejandro is a Full-Stack Engineer with 6 years of commercial experience, specializing in React, Node.js, TypeScript, and cloud integrations. He has delivered production applications across AI-powered platforms, education, and enterprise environments, including migrating a student-facing chatbot from legacy NLP to GPT-4 and building full-stack products from the ground up. His experience spans frontend and backend development, API and third-party integrations, testing, and AI-enabled applications. Alejandro demonstrates strong technical autonomy, architectural reasoning, and a practical approach to delivering end-to-end solutions.

6 years of commercial experience in
AI
Chatbots
Agentic automation
Main technologies
Typescript
1 year
JavaScript
6 years
React
4 years
Node.js
1 year
Next.js
1 year
Additional skills
AI agent development
Vite
GPT-4
Redux
Azure DevOps
Angular
Astro
Oracle
MongoDB
React Native
Direct hire
Possible
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Experience Highlights

Senior Frontend Developer
Jan 2023 - Dec 20252 years 11 months
Project Overview

AI-powered student support platform integrated with university systems, providing personalized assistance and knowledge-base Q&A through LLMs and semantic search.

Responsibilities:
  • Led the migration of a legacy NLP chatbot to GPT-4 via Azure OpenAI API, improving response quality for an AI assistant serving thousands of active students;
  • Developed AI-powered applications for a university client using React, Redux, JavaScript, Styled Components, and Tailwind CSS;
  • Integrated university APIs and third-party services to support student-facing AI workflows, working within an Azure DevOps environment;
  • Developed a bot-assisted application for prospective students and built a custom React chatbot widget for integration into university web properties;
  • Improved the custom UI for AI applications, resolving CMS embedding issues and implementing minimize and fullscreen chat modes;
  • Introduced TDD practices using Jest and React Testing Library and implemented Storybook for component testing and documentation;
  • Maintained and improved the production university AI chatbot, resolving issues and improving code quality.
Project Tech stack:
React
Redux
JavaScript
Azure DevOps
GPT-4
Middle Full Stack Developer
Jun 2022 - Dec 20226 months
Project Overview

Internal lean manufacturing platform enabling employees to submit and track process improvements, supporting a company-wide recognition and rewards program.

Responsibilities:
  • Developed internal applications using React, Angular, Node.js, and MongoDB to support lean manufacturing initiatives and operational improvements;
  • Built a lean manufacturing application enabling employees to register and track workflow improvements, supporting the company’s monthly employee recognition and rewards program;
  • Developed a data integration application using React, Angular, Node.js, Oracle, and Google APIs to import and synchronize data from Google Sheets into an Oracle database;
  • Migrated the engineering team from local, USB, and email-based file sharing to Git and GitLab, and designed a standardized branching workflow for the team;
  • Implemented Firebase Cloud Messaging and developed a custom Node.js library for reusable email and push notifications.
Project Tech stack:
React
Angular
Node.js
MongoDB
Oracle
Firebase Cloud Messaging
Middle Software Developer
Apr 2020 - Apr 20222 years
Project Overview

University recruitment platform centralizing the student hiring process, enabling partner companies to publish job opportunities and recruit students while providing transparent, statistics-driven tracking of the recruitment process.

Responsibilities:
  • Designed and developed the student recruitment platform within four months using Angular, Node.js, and MongoDB, centralizing a previously fragmented hiring process into a single system;
  • Built functionality enabling partner companies to publish job opportunities and recruit students, while allowing students to create and print their first resumes;
  • Implemented statistics-driven tracking and reporting to provide visibility into the student recruitment process;
  • Developed a separate web and mobile inventory-auditing application using Angular, Ionic, Node.js, and MongoDB, supporting inventory counting, management, and statistical reporting;
  • Contributed as a Full-Stack Developer to the delivery of additional client-facing products using the MEAN stack.
Project Tech stack:
Angular
Ionic
Node.js
MongoDB

Education

2025
Game Design and Development
Master's Degree
2022
Software Development and Management
Engineer
2020
Multiplatform Software Development
Associate Degree

Languages

Spanish
Advanced
English
Advanced

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