Hi!!, I'm Luis Available to work

Work Experience

1. Aug 2025 - Dec 2025

   Full Stack Developer

   Freelance Services

   Remote

   • Project 1: Instagram Customer Support Chatbot (WATI — production with real users)

     • Designed and implemented a rule-based chatbot on WATI (Instagram), automating 60-70% of incoming customer queries within the first month of deployment.
     • Analyzed historical chat data to identify friction patterns and drop-off points, restructuring conversation flows based on real user behavior.
     • Architected the solution as a data pipeline: ingestion → validation → automated response — ensuring traceability and consistency across all interactions.
     • Monitored system performance via resolution rate and response time metrics, iterating on response logic continuously based on production data.
     • Delivered a working flow in under one week; expanded the system over the following month based on client feedback and live usage patterns.

   • Project 2: Class Booking Platform (full-stack greenfield build)

     • Sole engineer and client-facing technical lead: gathered requirements directly, translated business needs into a relational data model, and owned all architectural decisions independently.
     • Designed a normalized PostgreSQL schema (Supabase) from scratch, applying indexing strategies and data modeling principles for performance and scalability.
     • Built secure authentication flows and data validation pipelines, ensuring consistent user data handling across React frontend and Node.js backend.
     • Managed CI/CD pipelines and production monitoring end-to-end.
     • Client reference available upon request.

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2. Jul 2025 - May 2025

   Full Stack Developer

   Consulting Company

   Hybrid

   • Project 1: ATS Platform (HR SaaS product — greenfield development for a consulting client)

     • Sole developer on a greenfield ATS module: built end-to-end job posting ingestion via CSV-to-database pipelines, including schema design, data normalization, and validation logic in PostgreSQL.
     • Designed and implemented a full psychometric evaluation module: form rendering, candidate response capture, and structured persistence — owning backend, frontend (Angular), and database layers entirely.
     • Worked from scratch with only existing modules as reference, no documentation, no handoffs — reverse-engineered domain logic independently.

   • Project 2: Medical Affiliate System (1,000+ active users, 64-table MySQL database)

     • Inherited a legacy system with 6+ months of backlog, no documentation, and a tech lead unable to provide technical guidance; completed 10-11 of 24 high-priority user stories in under 6 weeks.
     • Navigated a 64-table MySQL schema with no ERD or documentation, mapping relationships and business logic through code archaeology and direct database analysis using MySQL Workbench and DBeaver.
     • Identified and consciously scoped a critical permissions gap (API-level over-permissioning): documented the risk and deferred remediation to stay within sprint scope — a deliberate technical trade-off, not an oversight.
     • Built a data reporting module translating business requirements into SQL queries against the legacy schema with no prior context.
     • Stack: React, React Redux, Node.js (no framework), MySQL. Frontend and backend with full ownership across both layers.

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Projects

Oracle Database Optimization — Chinook

• Oracle DB
• PL/SQL
• SQL Developer

SQL performance optimization project using the Chinook database, focused on query tuning and indexing to improve efficiency.

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Simple-Calc

• Astro
• JavaScript
• CSS

Small website made for a former coworker to safe time during a billing process. It retrives the original value from an amount that already includes a 13% VAT.

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JPNG to WEBP Converter

• Python

Small desktop python app made to convert PNG files to WEBP files.

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