Personal details

Andrés R. - Remote full-stack developer

Andrés R.

Based in: 🇪🇨 Ecuador
Timezone: Bogota (UTC-5)

About

Senior Full-Stack Developer with over 8 years of experience building real-world web applications and scalable platforms, including AI-driven products. I work across the stack using Python, Node.js, React, and FastAPI, with hands-on experience designing and shipping systems that integrate modern language models and retrieval-based architectures. I am comfortable owning technical decisions, balancing performance and cost, and taking projects from early design through production release. I have deployed and maintained cloud-native systems using CI/CD pipelines, Docker, and Kubernetes, and enjoy working closely with product, design, and engineering teams in fully remote environments to deliver reliable, user-focused solutions.

Work Experience

Full-Stack AI Engineer
Narratica | May 2024 - Nov 2025
Python
Node.js
MongoDB
Algorithm
React
Chatbot
IBM MQ
RESTful API
OpenAI
Fastapi
Supabase
Prompt Engineering
Langchain
Retrieval-Augmented Generation
Copilot workspace
  • Architected and developed a full-stack AI-powered bid-matching platform using Node.js, MongoDB, and React, deployed on DigitalOcean with a complete CI/CD pipeline implementation.
  • Implemented an AI document-parsing system using instructor.js for LLM orchestration and Zod for structured output validation, comparing top-tier and lightweight models across providers (GPT-4/3.5, Claude Opus/Haiku, Gemini Pro/Flash, Grok).
  • Conducted comprehensive cost-benefit analyses of LLM models and vector store solutions (OpenAI, Ragie, Google Vertex AI, and in-house), providing data-driven recommendations that informed key architectural decisions.
  • Designed the complete software architecture in Miro, establishing system blueprints for backend services, AI integration, and data flow across the platform.
  • Built co-pilot chat functionality with persistent message storage and a single-thread-per-opportunity architecture, integrating CopilotKit with a defined RAG architecture and backend actions to enable users to extract useful data.
  • Developed a document-scraping pipeline using Playwright with smart bot-detection bypass techniques (stealth and proxy), handling complex formats including ZIP files and image-based documents.
  • Built frontend components in React based on Lovable-generated code, resolving frontend/backend inconsistencies and API schema duplication issues.
  • Led technical evaluations and selected Gemini 2.5 Flash as the most cost-effective model with sufficient quality for production parsing, transitioning the project from the research phase into full production build mode.
Senior frontend developer
PowerMap | Nov 2023 - Oct 2025
HTML/CSS
TypeScript
React
JavaScript
Redux
Redux-Saga
Tailwind css
React (next.js)
  • Developed and maintained interactive, user-friendly geospatial dashboards for real-time energy consumption and grid performance visualization using React.js.
  • Designed and implemented responsive, mobile-first UI components that improved user engagement by 25%.
  • Integrated data visualization tools like D3.js and Chart.js to display complex energy metrics, providing insights into grid performance and efficiency.
  • Worked closely with backend engineers to consume RESTful APIs, ensuring seamless data flow and synchronization between frontend and backend systems.
  • Optimized web application performance, reducing load times by 30% through code splitting, lazy loading, and image optimization techniques.
  • Collaborated with UX/UI designers to create wireframes and mockups that enhanced the user experience and simplified complex data interactions.
  • Implemented state management solutions using Redux, improving application performance and maintainability.
  • Conducted thorough unit and integration testing with Jest and React Testing Library to ensure high-quality, bug-free code.
  • Participated in Agile ceremonies including sprint planning, retrospectives, and daily stand-ups to ensure timely delivery of features.

Projects

Senior Full-stack Developer
2020 | https://www.adorebeauty.com.au
HTML/CSS
TypeScript
E-commerce
React
JavaScript
Next.js
Nuxt.js
Vue.js
- Worked on migrating the ecommerce project from nuxt(vue framework) to next.js(react framework) - Collaborated cross functional team to migrate from Vue to React - Created diagnostic scripts to identify edge cases and bugs not covered by existing automated tests.
Senior Frontend Developer
2018 | https://www.lendingusa.com
HTML/CSS
WebSocket
TypeScript
React
Dashboards
JavaScript
Axios
Tailwind css
- Collaborated cross functional team to develop the internal tools using React. - Integrated ag-grid for grid heavy web application and worked on data visualization - Built frontend components in React based on Lovable-generated code, resolving frontend/backend inconsistencies and API schema duplication issues.

Education

Universidad de las Fuerzas Armadas - ESPE
Bachelor's degree・Computer Science
Apr 2016 - Apr 2020