English Español
Oscar Bartolome Valdez Sarubbi
Fernando de la Mora, Paraguay
SUMMARY
Full Stack Developer with 5+ years of experience building web and mobile products with React, Vue.js, Laravel, Django, and Ionic. Strong background in SQL-based systems (PostgreSQL, PostGIS, SQL Server), API design and implementation, and cloud-native delivery with Docker and CI/CD. Experienced building AI-powered assistants, including RAG and chatbot solutions integrated with LLM APIs and production backends. Proven ability to lead teams, ship reliable systems, and improve product experience through practical engineering decisions.
SKILLS AND TECH
  • Programming Languages: JavaScript, TypeScript, CSS, HTML, Python, C/C++, PHP, C#, VB.NET, SQL, Bash, Nix.
  • Front-end: React, React Native, Expo, Tailwind, Framer Motion, Bootstrap, Vue.js, Next.js, TanStack Query.
  • Back-end: Django, Django REST Framework, Express, Laravel, ASP.NET, REST APIs, API Design, OpenAPI, GraphQL.
  • AI / LLM: RAG, LangChain, Agentic Programming, LLM API Integration, Vector Databases, NLP.
  • Databases: SQL Server, PostgreSQL, PostGIS, Redis.
  • Operating Systems: Windows, Linux, Ubuntu, Arch, MacOS.
  • Tools: VsCode, Docker, Compose, Vim, Neovim, AWS.
  • Others: Automatization, Scripting, Testing, Clean Code, Design, Scrum, Telecommunications, Problem Solving, VMs, Proxmox, CI/CD.
LANGUAGES
  • English: Intermediate Fluent
  • Spanish: Native
EXPERIENCE
Helpers SA Lead Developer — Present
Asuncion, Paraguay https://www.helpers.com.py/
  • Led a team of 4 developers to deliver and maintain a B2C services platform with Laravel, Vue.js, and PostgreSQL.
  • Designed synchronization APIs that replaced blocking flows with asynchronous queue-based processing using Redis and Horizon.
  • Defined API contracts and integration patterns to improve consistency between web, mobile, and backend services.
  • Built and maintained CI/CD pipelines with GitLab and Docker to standardize deployments and reduce release friction.
  • Delivered and maintained production mobile features in Ionic, React, and TypeScript.
BIX SA Cross-Platform Developer —
Asuncion, Paraguay https://www.bixparaguay.com/
  • Rebuilt a mobile application end-to-end using Ionic, React, and TypeScript, improving maintainability and release cadence.
  • Refactored and extended Laravel REST APIs to support new mobile workflows and cleaner domain boundaries.
  • Improved API reliability by standardizing validation, error handling, and response formats across endpoints.
  • Collaborated with product and design teams to align API behavior with UX requirements.
Softec SRL Full Stack Software Developer —
Asuncion, Paraguay https://softec.com.py/
  • Built and maintained location-based applications with React, Django, PostgreSQL, and PostGIS.
  • Designed and implemented REST APIs with Django REST Framework and OpenAPI documentation for clear client integration.
  • Modeled relational data structures and wrote SQL for transactional modules, reporting needs, and systems integration.
  • Built CI/CD pipelines for existing codebases using Docker and GitLab.
  • Led electronic invoicing and SAP HANA integrations in a .NET codebase with SQL Server-backed workflows.
  • Developed real-time in-app chat using WebSockets and Django Channels.
  • Designed and implemented a RAG assistant with LangChain, vector databases, and LLM APIs to improve document discovery and answer quality.
PROJECTS
Faculty Chat Bot:
  • Built a chatbot with Rasa Open Source and custom NLU models to handle student queries.
  • Implemented a Python backend with PostgreSQL for reliable data persistence and conversation tracking.
  • Integrated the Telegram API to provide a familiar and accessible user channel.
  • Containerized the service with Docker to standardize local setup and deployment.
  • Applied Transformer-based NLP techniques to improve intent recognition and response quality.
Personal Blog:
  • Built a performant static site with Astro.js for fast page delivery and SEO-friendly rendering.
  • Implemented Strapi as a headless CMS with structured content models for posts, categories, and metadata.
  • Designed GraphQL queries for flexible content retrieval across listing and detail views.
  • Configured PostgreSQL for reliable content persistence and schema-driven content management.
  • Containerized the application with Docker to standardize local development and deployment workflows.
EDUCATION
Universidad Nacional de Asunción
BG - Electronic Engineering
CERTIFICATES
Cybersecurity Essentials, Cisco Network Academy
AWS Cloud Technical Essentials, Amazon Web Services
Architecting Solutions on AWS, Amazon Web Services
Building Data Lakes on AWS, Amazon Web Services
REFERENCES
Rodrigo Elizeche
CEO at Helpers
Pablo Vergara
Project Manager at Bix S.A
Paolo Pessolani Urbieta
CEO at Softec S.R.L
Julio Kanazawa
Project Manager at Softec S.R.L