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Leonardo Kameya

Senior Software Engineer

Building high-quality software with modern technologies

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Personal Projects

A selection of my recent work

Agentic Songwriter project screenshot

Agentic Songwriter

A learning-first agentic AI project that helps songwriters create song drafts. Built with Next.js and TypeScript, demonstrating orchestrator loops, tool-based LLM integration, state management, tracing, and human-in-the-loop capabilities.

Next.jsTypeScriptReactPrismaPostgreSQLOpenAI APINextAuth.jsTone.jsServer-Sent Events
Live Demo →GitHub →
RAG Knowledge Base project screenshot

RAG Knowledge Base

A production-ready Retrieval-Augmented Generation (RAG) backend service for document ingestion and question answering. Supports PDF, Markdown, and TXT files, creates embeddings, stores them in a vector database, and provides accurate answers with citations.

Node.jsTypeScriptExpress.jsLangChainChromaDBOllamaSQLiteServer-Sent Events
GitHub →
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Education

Bachelor's Degree in Computer System Analysis (Análise de Sistemas de Computação)

Universidade Federal de Mato Grosso do Sul

2007 - 2011

Final Paper (2011)

Implementing digital signatures using Hash Functions

Implementing MD5, SHA1, SHA256, and digital signatures using Merkle Trees.

Experience

Software Engineer / Line Manager

CI&T • Campinas, São Paulo, Brazil - Remote

Dec 2021 - Present
  • • Serve as Full Stack Developer and Frontend Tech Lead, delivering high-quality solutions for enterprise clients across Brazil and the United States
  • • Manage and guide developers in their career development, providing mentorship, career path planning, and professional growth opportunities
  • • Mentor development teams, facilitate professional growth, and conduct performance evaluations to drive team excellence
  • • Lead frontend architecture initiatives, designing and implementing scalable e-commerce systems and vehicle sales management platforms for a major automotive corporation
  • • Architect and develop an online education platform leveraging modern web technologies and best practices
JavaScriptReact.jsNext.jsTypeScriptNode.jsNestJSGraphQLApollo GraphQLPostgreSQLMySQLSQLiteRedisAWSGCPAdobe Enterprise ManagerMicrofrontendGenAI

Frontend Developer

UnicornPowered • Quebec, Canada - Remote

Aug 2021 - Oct 2021
  • • Developed React-based frontend for an interactive application focused on Canadian voter lifestyle data visualization
  • • Delivered dynamic data presentations through engaging, responsive visual interfaces
  • • Built reusable UI components, integrated external APIs, and implemented best practices for performance, accessibility, and user experience
React.jsStorybook

Frontend Engineer

Alooba • Sydney, Australia - Remote

Jul 2020 - Apr 2021
  • • Designed landing pages and React components using Figma, ensuring pixel-perfect implementation
  • • Developed a production-ready landing page using GatsbyJS with React frontend and Strapi headless CMS backend
  • • Maintained legacy PHP systems while contributing to platform migration to modern architecture using React/Redux, microservices, and AWS infrastructure
React.jsGatsbyJSRedux.jsStrapi.jsAWSFigmaCMS

Software Developer

Sanesul • Campo Grande, Brazil

Jun 2014 - Nov 2019
  • • Developed and maintained a custom C# library to standardize project implementations and enhance team productivity
  • • Led migration initiatives from jQuery-based projects to modern frontend frameworks (React and Vue), reducing complexity and improving application performance
  • • Implemented continuous integration and deployment pipelines in Azure DevOps, reducing testing and deployment time by over 50%
  • • Architected and developed multiple enterprise applications using .NET Core, Entity Framework, SQL Server, and Oracle
React.jsReact NativeC#.NET Framework.NET CoreEntity FrameworkSQL ServerOraclePL/SQLGitAzure DevOps

System Analyst

AZ Tecnologia em Gestão • Campo Grande, Brazil

Sep 2013 - Jun 2014
  • • Collaborated with cross-functional teams to gather requirements and analyze legacy system migration from Natural to .NET platform
  • • Conducted stakeholder interviews with State Attorney's Office representatives to collect and validate business requirements
  • • Documented comprehensive use cases and designed database schema for the new system architecture
MainframeLegacy SystemsLegacy ModernizationADABASSQL ServerTFS

Professor

Integrated High School of Science and Technology • Campo Grande, Brazil

Apr 2013 - Aug 2013
  • • Served as temporary instructor for high school and undergraduate programs at IFMS (Federal Institute of Mato Grosso do Sul), delivering technology-focused curriculum
  • • Taught high school courses: Databases, Introduction to Computing, and Software Engineering
  • • Delivered undergraduate courses: Web Development I (HTML/CSS/JavaScript) and E-commerce (PHP/Magento)
TeachingDatabasesHTMLCSSJavaScriptPHPMagento

Full Stack Developer

Agence Consultoria • Campo Grande, Brazil

Jul 2012 - Feb 2013
  • • Analyzed requirements and developed full-stack solutions for academic systems and content management platforms
C#ASP.NET.NET FrameworkJavaScriptGit

Web Developer

Itel Informática • Campo Grande, Brazil

Apr 2010 - Apr 2012
  • • Served as IT technician, providing technical support for electronic equipment maintenance and barcode reader programming
  • • Contributed to document digitization and archival projects for public-sector institutions
VB.NETASPASP.NET MVCSQL Server