Renny Luzardo
Senior Frontend Engineer
Based in Venezuela / Colombia
About
Senior Frontend Engineer with 10+ years building high-performance interfaces for B2B and B2C products across Fintech, SaaS, and E-commerce. Expert in component architecture, design systems, and full-stack development (React, Angular, React Native, Node.js).
Currently focused on AI-agentic systems: LLM orchestration with LangGraph, generative UI design, UISchema contracts with Zod, and knowledge-driven development (Agents.md, skills.md, rules.md). Building Adaptive-POS — a next-generation point-of-sale system where interfaces generate dynamically based on user intent and real inventory data.
Strong advocate for sustainable architecture over short-term delivery pressure. Passionate about measurable impact: bundle optimization (60% reduction), system reliability (99.8% uptime), and code quality through thoughtful design patterns and AI-assisted engineering (Windsurf, GitHub Copilot, Claude).
Open to remote roles.
GitHub Stats
Tech Stack
Frontend
- Frameworks: React 19 · Next.js · Angular
- Languages: TypeScript
- State Management: Redux · RxJS · Zod Validation
- Styling: TailwindCSS 4 · SASS/BEM · Styled Components
- Patterns: Generative UI · Component Registry · Server-Driven UI
Mobile React Native
Backend Node.js · NestJS · Express.js · REST APIs · Server-Sent Events (SSE)
AI/ML & Orchestration
- LLM Integration: Google Gemini API · @langchain/core
- Graph Orchestration: LangGraph.js · Multi-agent Systems
- Validation: Zod Schemas · Prompt Regression Testing
- Observability: LangSmith
Database PostgreSQL · Row-Level Security · Multitenancy
Architecture & Standards
Tooling Git · Docker · AWS · Vite · Monorepo Management · Agile/Scrum
Testing Playwright · Cypress · Jest · Contract Testing · Integration Testing
AI-Assisted Development Windsurf · GitHub Copilot · Gemini · Claude · MCP (Jira/GitHub integration for LLMs) · Spec-Driven Development
Agile Jira · Confluence · Slack
Featured Work
🤖 Adaptive POS
AI-Driven Generative UI Orchestration system using LangGraph & NestJS. An adaptive Point of Sale system that dynamically generates user interfaces through Server-Driven UI architecture, with the backend evaluating user intent and returning UI schemas that the frontend renders in real-time.
- Innovation: Multi-agent system with specialized roles (Frontend, Backend, QA, Infra, Doc agents) following Spec-Driven Development methodology
- Architecture: Generative UI paradigm with Zod schema contracts, LLM hallucination resilience, and real-time Server-Sent Events
- Tech Stack: NestJS + LangGraph.js + Google Gemini API (Backend) • React 19 + TailwindCSS 4 + Vite (Frontend)
- Impact: Demonstrates cutting-edge AI-assisted engineering workflows with robust validation and enterprise-grade architecture
🏛️ Software Engineering & Architecture Vault
A curated collection of Architectural Decision Records (ADRs), performance case studies, and system design documents derived from real production experience.
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Agentic Systems: Adaptive POS (architecture and workflow docs) with practical guides for multi-agent orchestration, role-based workflows, and implementation standards for adaptive interfaces. Tech: LangGraph, Agentic systems, Generative UI, Spec-driven development
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Restaurant OS: miPOS Omnichannel Console (Public Reference) Lead Frontend for an API-first omnichannel console. Normalized fragmented delivery data (Rappi/Uber) into a unified interface, saving 2-5 min per ticket.
Tech: React, API-first architecture, Data normalization -
Fintech: Bundle optimization strategy (Vite) projecting 60% reduction in initial load time and +40 Lighthouse score points — based on work at Amex Business Link.
Tech: Vite, Performance optimization, Fintech -
Mobile Resilience: SRE patterns for maintaining 99.8% uptime on a mission-critical React Native app (Duragas Pro).
Tech: React Native, SRE, Mobile reliability -
SaaS Architecture: Multitenant system design with Row-Level Security using NestJS, React 19, and PostgreSQL.
Tech: NestJS, React 19, PostgreSQL, Multitenancy, Row-Level Security -
Accessibility: Theme system built on Gestalt principles and WCAG 2.1 AAA contrast standards
Tech: WCAG 2.1 AAA, Accessibility, Design systems
Explore my architectural methodology → software-engineering-vault