LUCAS HIAGO

Senior Software Engineer | Front-End Specialist | Architecture & Performance
lucashiago.dsf@gmail.com | github.com/LucasHiago | linkedin.com/in/lucashdsf
Professional Summary
Senior Software Engineer with 10+ years building and scaling web platforms for e-commerce, SaaS and enterprise clients. Deep in the TypeScript ecosystem — Angular front-ends and Nest.js back-ends — with a track record of taming legacy code, modernizing architectures (Angular 8x→19x, Java→Nest.js) and cutting technical debt without stalling delivery. Pragmatic with AI: integrates LLMs and production-ready AI workflows where they earn their place. Focused on performance, maintainability and scalability that survives real growth.
Technical Skills
Front-End: Angular (8x–19x), TypeScript, HTML5, SCSS, RxJS, Component Architecture, Design Systems
Back-End: Nest.js, Node.js, REST APIs, WebSockets, Sequelize
Data: PostgreSQL, MySQL, MSSQL, Data Modeling, Query Optimization
Architecture & Practices: SOLID, Layered Architecture, Clean Code, Refactoring, Technical Debt Reduction, Agile
Infrastructure: AWS basics, CI/CD concepts, Performance Tuning
Artificial Intelligence: LLM Integration (OpenAI API, local models via Ollama), Prompt Engineering, RAG Architecture, Embeddings & Vector Databases, AI Agents Concepts, ONNX Runtime, AI-driven automation workflows
Professional Experience
NETPROJECT — PMO Platform
2024 – Present · Contract
Senior Full-Stack Engineer
  • Built and maintained enterprise applications across an Angular + Nest.js stack, from UI architecture to REST and real-time back-end services
  • Led legacy modernization — migrated Java services to Nest.js and restructured the codebase for maintainability and scale
  • Designed and optimized relational schemas across PostgreSQL, MySQL and MSSQL, tuning queries to remove performance bottlenecks
  • Implemented AI-driven features on top of the core platform — LLM integration, document understanding and workflow automation — shipping a ~7K-LOC AI subsystem within a 134K-LOC Laravel codebase (228 endpoints, 156 models)
Jet E-commerce
Feb 2021 – Nov 2023
Front-End Engineer
  • Built scalable Angular front-ends for the Virtuol Pro and NEO e-commerce platforms, serving multiple live stores
  • Designed 4 commercial themes and a modular component library reused across stores
  • Drove the Angular 9 → 14 and Node 18 upgrades, improving performance and long-term maintainability
CARBEL – Alpes.one
May 2020 – Feb 2021
Front-End Engineer
  • Built full-stack landing pages and institutional websites using October CMS and Laravel
  • Developed semantic HTML, SCSS architecture and ES6 modules with maintainable structure
Open Digital
Front-End Engineer
  • Built responsive, high-performance web interfaces from semantic markup up
  • Applied a modular CSS and JavaScript architecture that improved maintainability
Selected Projects
Steply – SaaS Platform
Full-stack SaaS solution using Angular 19x, Nest.js and Socket.io.
TOTVS Support Portal Migration
Migrated Angular application from version 16x to 19x integrated with Zendesk and legacy Java services.
NEO E-commerce Framework v3
Led migration from Angular 8x to 16x improving performance and long-term maintainability.
AI Assistant & Automation Engine
Designed and implemented AI-powered workflows integrating LLM APIs for content generation, automation and intelligent data processing. Built structured prompt pipelines, backend orchestration in Nest.js and scalable REST endpoints for AI features.
Education
Technical Degree in Game Development | Universidade Salgado de Oliveira | Since 2016