Luís Guilherme Pelin Martins

AI System Architect | Principal Full Stack Engineer

Remote · Belo Horizonte, Brazil · lgpelin92@gmail.com · linkedin.com/in/lguibr · github.com/lguibr · luisguilher.me

PROFESSIONAL SUMMARY

Principal Full Stack Engineer and AI System Architect with over 15 years of applied software engineering expertise. My career is defined by a deep specialization in architecting scalable full-stack web platforms and intelligent, agentic AI systems, augmented by a strong focus on interactive game development. My engineering philosophy prioritizes pragmatic product development, ensuring highly responsive web applications, deterministic AI workflows, and deeply engaging user interfaces.

I excel at designing robust, data-driven applications and orchestrating complex LLM workflows to solve critical business challenges. My core competencies span Full Stack Web Development (React, TypeScript, Node.js, Next.js), AI System Architecture & Agentic Orchestration (LangGraph, LLM execution chains, RAG), and Interactive Web & Game Development (WebGL, Three.js, WebSockets). Demonstrated success includes slashing LLM latency by 66%, unifying fragmented codebases into cohesive web applications, and leading cross-functional teams to deliver scalable software that drives substantial business value.

TECHNICAL ARSENAL

  • Full Stack Web Development: TypeScript, React 19, Next.js, Node.js, Python (FastAPI, Django), Go, PostgreSQL, GraphQL, IndexedDB, Zustand, Micro-frontends, PWA.
  • AI Systems & Machine Learning: Multi-Agent Orchestration (LangGraph), RAG, Semantic Caching, Seeded LLMs, Autonomous Agents, OpenAI/Gemini APIs, Computer Vision (SAM, MediaPipe, BlazePose).
  • Interactive UI & Game Development: Three.js (React Three Fiber), WebGL/WebGPU, Canvas API, Multiplayer State Synchronization, WebSockets, Procedural Generation, Physics Engines.
  • Infrastructure, Data & DevOps: Terraform (CDKTF), AWS (ECS/Fargate/S3), GCP, Kubernetes, Docker, BigQuery, Redis, SQLite, GitHub Actions (CI/CD), Playwright (E2E).

PROFESSIONAL EXPERIENCE

Trebu (YC S22) | Head of AI / AI Software Engineer

July 2024 – November 2025

Architected autonomous negotiation engines and AI workflows for a high-growth logistics startup, supplanting manual, imperative state management with deterministic, LLM-driven state machines to automate complex freight-matching processes.

  • Autonomous Negotiation Engine: Spearheaded the design and implementation of a multi-agent negotiation engine capable of concurrently processing trip requests, availability, and pricing without human intervention.
  • Parallel LangGraph Execution: Engineered a parallel execution framework utilizing dual trees of stateless agents and LLMs, anchored by a SQL database. Orchestrated workflows to execute concurrent operations for data extraction, state persistence, and active trucker negotiation.
  • Performance & Business Impact: Fully automated the negotiation lifecycle. By aggregating communications and executing parallel LangGraph workflows, I slashed LLM latency by 66% (maintaining sub-50-second execution times) and substantially scaled the daily volume of successful freight matches.
  • Computer Vision Integration: Embedded the Segment Anything Model (SAM) into the OCR pipeline as a conditional node, elevating document parsing accuracy for unstructured manifests by 6% via automated ROI segmentation.

Paradigm | Software Engineer (Institutional Trading)

April 2022 – April 2024

Engineered mission-critical full-stack systems for the world’s premier institutional crypto derivatives network, sustaining high-volume trading environments during the transition to "Market 2.0".

  • Architecture Consolidation: Deprecated fragmented React Native and Electron codebases, unifying them into a highly responsive web application wrapped in RN/Electron exclusively for native OS notifications. Consolidated the UI into a singular TypeScript monorepo, accelerating cross-platform feature delivery by 30%.
  • Real-Time State Synchronization: Engineered a parallel Golang microservice tier leveraging Kafka Pub/Sub to deliver non-blocking, high-throughput state synchronization to the frontend via WebSockets, ensuring the UI remained perfectly synchronized with backend trading engines.
  • E2E Reliability: Architected a comprehensive rewrite of the E2E and unit testing layers utilizing Python Playwright and Jest. This robust pipeline guaranteed flawless execution logic during extreme market volatility, drastically reducing production regressions.

Trio | Tech Lead & Senior Software Engineer

May 2020 – April 2022

Directed multiple development squads (1-5 engineers) to architect and deliver three highly complex, enterprise-grade web projects across diverse domains concurrently.

  • Enterprise IoT Traceability: Spearheaded the full-stack architecture for a mission-critical IoT traceability platform for a top-tier global brewery. Integrated BigQuery to monitor IoT telemetry across the supply chain, rendering specialized web views to trace ingredients, products, and sub-products.
  • Significant Cost Optimization: The resulting application empowered the client to instantaneously trace contaminated ingredients to specific batches, mitigating supply chain risk and averting potentially millions in recall expenditures.
  • Stateless Event-Driven ETL: Architected a fully stateless, event-driven ETL pipeline across AWS and GCP utilizing CDKTF and TypeScript, mitigating deployment risks and facilitating instantaneous rollbacks.
  • Technical Leadership: Engineered an Electron-based activity tracker for a freelancer matching application and a subscription/certification system for a scientific journal. Instituted rigorous code-review standards that reduced deployment failures across all squads to near-zero.

TremTec | Software Engineer (Frontend Lead)

July 2019 – May 2020

Led the UI engineering division to standardize development practices and deliver sophisticated web applications for an agency managing concurrent client projects with disparate architectures.

  • Architectural Standardization: Established cross-project architectural consistency and mentored the frontend cohort on scalable React and TypeScript design patterns.
  • Velocity & Delivery: Guided the hands-on implementation of a sophisticated real estate marketplace (featuring advanced search/filtering heuristics) and a Brazilian Heroku-clone cloud-deployment dashboard. By standardizing the frontend architecture, I accelerated the team's delivery velocity by 25% and ensured highly scalable, maintainable codebases.

NetLex Brasil | Software Engineer

August 2018 – July 2019

Commissioned to engineer the core platform from inception following the successful pre-sale of the company's flagship legal document workflow platform.

  • Platform Architecture: Engineered a Single Page Application (SPA) utilizing Node.js, TypeScript, and AngularJS. Modeled robust relational database schemas to process deeply nested metadata.
  • Complex Execution Graphs: Designed a sophisticated document lifecycle execution graph orchestrating multi-step approvals, email integrations, and DocuSign API connectivity.
  • Business Impact: Successfully deployed the pre-sold MVP to production on schedule. This foundational architecture enabled the company to secure its initial revenue stream and scale the platform to accommodate complex, enterprise-grade legal permission structures.

Freelance | Freelance Software Developer

January 2011 – July 2018

  • Cross-Disciplinary Foundation: Funded rigorous academic pursuits by architecting and delivering bespoke full-stack software solutions for diverse clients.
  • Pragmatic Engineering: This 7.5-year tenure cultivated a highly pragmatic, hands-on foundation in web development, database design, and client-facing software engineering.

Editora Ecologica | Software Engineer

May 2008 – December 2010

  • E-commerce Administration: Managed the company's e-commerce platform, ensuring operational stability, high availability, and robust client email infrastructure.

SELECTED ARCHITECTURAL & GAME DEVELOPMENT PROJECTS

  • Daicer (AI-Powered RPG Platform): Architected a full-stack tabletop RPG platform blending generative AI with interactive 3D environments. Built with a Node.js/GraphQL backend, LangGraph for AI Dungeon Master orchestration, and a React Three Fiber (R3F) frontend for real-time WebGL rendering.
  • PonGo (Real-Time Multiplayer Game): Developed a 4-player hybrid of Pong and Breakout utilizing Go and WebSockets. Powered by a custom Actor Model architecture for high concurrency and scalable game state management, integrated with a React Three Fiber (R3F) WebGL client.
  • Luisguilher.me (VFS Portfolio): Engineered a strictly client-side Next.js architecture to structurally eradicate SSR hydration mismatches. Utilized a centralized React Context/Provider pattern to orchestrate a custom Virtual File System (VFS) and global window states, creating an interactive, IDE-like web experience.
  • SalvoProntuário (Medical Records SPA): Developed a secure, offline-first React application for clinical therapists. Strategically optimized for a rapid MVP lifecycle, utilizing IndexedDB and a deterministic Last-Write-Wins (LWW) resolution strategy for seamless data synchronization.

EDUCATION

Bachelor of Physics (Advanced Studies) | Universidade Federal de Minas Gerais (UFMG) (Jan 2018 - Nov 2024)

  • Focus: Complex Systems, Numerical Simulations, and Stochastic Processes. Cultivated strong analytical and problem-solving capabilities, applying computational methods and programming to model complex, dynamic systems.

Technical Degree in Information Technology | CEFET-MG (Feb 2006 - Dec 2008)

  • Focus: Foundational Software Engineering, Data Structures, Algorithms, and Software Architecture.
Luís Guilherme

Luís Guilherme Pelin Martins

AI System Architect | Principal Full Stack Engineer

Remote · Belo Horizonte, Brazil · lgpelin92@gmail.com · linkedin.com/in/lguibr · github.com/lguibr · luisguilher.me

PROFESSIONAL SUMMARY

Principal Full Stack Engineer and AI System Architect with over 15 years of applied software engineering expertise. My career is defined by a deep specialization in architecting scalable full-stack web platforms and intelligent, agentic AI systems, augmented by a strong focus on interactive game development. My engineering philosophy prioritizes pragmatic product development, ensuring highly responsive web applications, deterministic AI workflows, and deeply engaging user interfaces.

I excel at designing robust, data-driven applications and orchestrating complex LLM workflows to solve critical business challenges. My core competencies span Full Stack Web Development (React, TypeScript, Node.js, Next.js), AI System Architecture & Agentic Orchestration (LangGraph, LLM execution chains, RAG), and Interactive Web & Game Development (WebGL, Three.js, WebSockets). Demonstrated success includes slashing LLM latency by 66%, unifying fragmented codebases into cohesive web applications, and leading cross-functional teams to deliver scalable software that drives substantial business value.

TECHNICAL ARSENAL

  • Full Stack Web Development: TypeScript, React 19, Next.js, Node.js, Python (FastAPI, Django), Go, PostgreSQL, GraphQL, IndexedDB, Zustand, Micro-frontends, PWA.
  • AI Systems & Machine Learning: Multi-Agent Orchestration (LangGraph), RAG, Semantic Caching, Seeded LLMs, Autonomous Agents, OpenAI/Gemini APIs, Computer Vision (SAM, MediaPipe, BlazePose).
  • Interactive UI & Game Development: Three.js (React Three Fiber), WebGL/WebGPU, Canvas API, Multiplayer State Synchronization, WebSockets, Procedural Generation, Physics Engines.
  • Infrastructure, Data & DevOps: Terraform (CDKTF), AWS (ECS/Fargate/S3), GCP, Kubernetes, Docker, BigQuery, Redis, SQLite, GitHub Actions (CI/CD), Playwright (E2E).

PROFESSIONAL EXPERIENCE

Trebu (YC S22) | Head of AI / AI Software Engineer

July 2024 – November 2025

Architected autonomous negotiation engines and AI workflows for a high-growth logistics startup, supplanting manual, imperative state management with deterministic, LLM-driven state machines to automate complex freight-matching processes.

  • Autonomous Negotiation Engine: Spearheaded the design and implementation of a multi-agent negotiation engine capable of concurrently processing trip requests, availability, and pricing without human intervention.
  • Parallel LangGraph Execution: Engineered a parallel execution framework utilizing dual trees of stateless agents and LLMs, anchored by a SQL database. Orchestrated workflows to execute concurrent operations for data extraction, state persistence, and active trucker negotiation.
  • Performance & Business Impact: Fully automated the negotiation lifecycle. By aggregating communications and executing parallel LangGraph workflows, I slashed LLM latency by 66% (maintaining sub-50-second execution times) and substantially scaled the daily volume of successful freight matches.
  • Computer Vision Integration: Embedded the Segment Anything Model (SAM) into the OCR pipeline as a conditional node, elevating document parsing accuracy for unstructured manifests by 6% via automated ROI segmentation.

Paradigm | Software Engineer (Institutional Trading)

April 2022 – April 2024

Engineered mission-critical full-stack systems for the world’s premier institutional crypto derivatives network, sustaining high-volume trading environments during the transition to "Market 2.0".

  • Architecture Consolidation: Deprecated fragmented React Native and Electron codebases, unifying them into a highly responsive web application wrapped in RN/Electron exclusively for native OS notifications. Consolidated the UI into a singular TypeScript monorepo, accelerating cross-platform feature delivery by 30%.
  • Real-Time State Synchronization: Engineered a parallel Golang microservice tier leveraging Kafka Pub/Sub to deliver non-blocking, high-throughput state synchronization to the frontend via WebSockets, ensuring the UI remained perfectly synchronized with backend trading engines.
  • E2E Reliability: Architected a comprehensive rewrite of the E2E and unit testing layers utilizing Python Playwright and Jest. This robust pipeline guaranteed flawless execution logic during extreme market volatility, drastically reducing production regressions.

Trio | Tech Lead & Senior Software Engineer

May 2020 – April 2022

Directed multiple development squads (1-5 engineers) to architect and deliver three highly complex, enterprise-grade web projects across diverse domains concurrently.

  • Enterprise IoT Traceability: Spearheaded the full-stack architecture for a mission-critical IoT traceability platform for a top-tier global brewery. Integrated BigQuery to monitor IoT telemetry across the supply chain, rendering specialized web views to trace ingredients, products, and sub-products.
  • Significant Cost Optimization: The resulting application empowered the client to instantaneously trace contaminated ingredients to specific batches, mitigating supply chain risk and averting potentially millions in recall expenditures.
  • Stateless Event-Driven ETL: Architected a fully stateless, event-driven ETL pipeline across AWS and GCP utilizing CDKTF and TypeScript, mitigating deployment risks and facilitating instantaneous rollbacks.
  • Technical Leadership: Engineered an Electron-based activity tracker for a freelancer matching application and a subscription/certification system for a scientific journal. Instituted rigorous code-review standards that reduced deployment failures across all squads to near-zero.

TremTec | Software Engineer (Frontend Lead)

July 2019 – May 2020

Led the UI engineering division to standardize development practices and deliver sophisticated web applications for an agency managing concurrent client projects with disparate architectures.

  • Architectural Standardization: Established cross-project architectural consistency and mentored the frontend cohort on scalable React and TypeScript design patterns.
  • Velocity & Delivery: Guided the hands-on implementation of a sophisticated real estate marketplace (featuring advanced search/filtering heuristics) and a Brazilian Heroku-clone cloud-deployment dashboard. By standardizing the frontend architecture, I accelerated the team's delivery velocity by 25% and ensured highly scalable, maintainable codebases.

NetLex Brasil | Software Engineer

August 2018 – July 2019

Commissioned to engineer the core platform from inception following the successful pre-sale of the company's flagship legal document workflow platform.

  • Platform Architecture: Engineered a Single Page Application (SPA) utilizing Node.js, TypeScript, and AngularJS. Modeled robust relational database schemas to process deeply nested metadata.
  • Complex Execution Graphs: Designed a sophisticated document lifecycle execution graph orchestrating multi-step approvals, email integrations, and DocuSign API connectivity.
  • Business Impact: Successfully deployed the pre-sold MVP to production on schedule. This foundational architecture enabled the company to secure its initial revenue stream and scale the platform to accommodate complex, enterprise-grade legal permission structures.

Freelance | Freelance Software Developer

January 2011 – July 2018

  • Cross-Disciplinary Foundation: Funded rigorous academic pursuits by architecting and delivering bespoke full-stack software solutions for diverse clients.
  • Pragmatic Engineering: This 7.5-year tenure cultivated a highly pragmatic, hands-on foundation in web development, database design, and client-facing software engineering.

Editora Ecologica | Software Engineer

May 2008 – December 2010

  • E-commerce Administration: Managed the company's e-commerce platform, ensuring operational stability, high availability, and robust client email infrastructure.

SELECTED ARCHITECTURAL & GAME DEVELOPMENT PROJECTS

  • Daicer (AI-Powered RPG Platform): Architected a full-stack tabletop RPG platform blending generative AI with interactive 3D environments. Built with a Node.js/GraphQL backend, LangGraph for AI Dungeon Master orchestration, and a React Three Fiber (R3F) frontend for real-time WebGL rendering.
  • PonGo (Real-Time Multiplayer Game): Developed a 4-player hybrid of Pong and Breakout utilizing Go and WebSockets. Powered by a custom Actor Model architecture for high concurrency and scalable game state management, integrated with a React Three Fiber (R3F) WebGL client.
  • Luisguilher.me (VFS Portfolio): Engineered a strictly client-side Next.js architecture to structurally eradicate SSR hydration mismatches. Utilized a centralized React Context/Provider pattern to orchestrate a custom Virtual File System (VFS) and global window states, creating an interactive, IDE-like web experience.
  • SalvoProntuário (Medical Records SPA): Developed a secure, offline-first React application for clinical therapists. Strategically optimized for a rapid MVP lifecycle, utilizing IndexedDB and a deterministic Last-Write-Wins (LWW) resolution strategy for seamless data synchronization.

EDUCATION

Bachelor of Physics (Advanced Studies) | Universidade Federal de Minas Gerais (UFMG) (Jan 2018 - Nov 2024)

  • Focus: Complex Systems, Numerical Simulations, and Stochastic Processes. Cultivated strong analytical and problem-solving capabilities, applying computational methods and programming to model complex, dynamic systems.

Technical Degree in Information Technology | CEFET-MG (Feb 2006 - Dec 2008)

  • Focus: Foundational Software Engineering, Data Structures, Algorithms, and Software Architecture.

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