Hello, I am
Leonardo Fukuyama
Software Developer
I build full-stack applications that solve real problems — from enterprise platforms to community tools that free people to do what they love.
About
I'm a full-stack developer based in Brazil, passionate about building software that creates tangible impact — whether for enterprise teams or the communities I belong to.
Currently a Software Development Intern at CI&T, I contribute to web platforms with Java, Spring Boot, React, and Python, with a strong focus on TDD and engineering quality. Previously I built scalable applications at Tata Consultancy Services for international clients.
When I'm not at work, I create tools for the Japanese cultural group I'm part of — from fair dance scheduling algorithms to bingo management for nonprofit fundraisers. I believe the best software solves genuine, human-centered problems.
Quick profile
Projects
Selected work — each built to solve a real problem for real people.
Bingo Manager
At the nonprofit group's annual fundraising event, volunteers had to manually track bingo cards for attendees who couldn't be present — pulling them away from enjoying the event and introducing human error in verification.
Matsuri Escala
As the Japanese cultural group grew, manually scheduling dance presentations for events took hours — ensuring fair participation across all members was a complex, tedious spreadsheet exercise.
Gondola OS
A leading gondola company managed all service orders on paper, requiring manual data entry after each field visit — prone to errors, delays, and information loss in areas with poor connectivity.
Experience
Professional journey — newest to oldest.
Software Development Intern
CI&T
- ▸Act as story lead and Kanban flow organizer, helping prioritize tasks, unblock delivery, and improve team throughput by approximately 50%.
- ▸Strengthen engineering standards through TDD, SOLID, and code reviews, sustaining 100% unit test coverage and highly consistent releases.
- ▸Contribute to a web-based feedback platform, owning full-stack stories that translate product requirements into scalable and reliable features.
- ▸Build and evolve APIs and backend business logic with Java, Spring Boot, and Python, prioritizing maintainability and engineering quality.
- ▸Develop modern responsive interfaces with React and Next.js, improving usability, performance, and long-term code sustainability.
- ▸Support generative AI and data-driven initiatives with Python, enabling intelligent product capabilities and user-facing enhancements.
- ▸Contribute to infrastructure and collaboration workflows using Docker, Git, and Bitbucket, improving environment consistency.
Fullstack Developer
Tata Consultancy Services
- ▸Supported software quality for a feature used by 10K+ users, reducing bugs in production and test environments through automation and engineering best practices.
- ▸Developed and maintained enterprise full-stack web applications with strong focus on clean code, scalability, and reliability.
- ▸Implemented APIs and backend services with Python and Node.js, supporting integrations, business workflows, and continuous product evolution.
- ▸Delivered type-safe interfaces with React and TypeScript, improving application consistency and user experience.
- ▸Collaborated daily with international teams in English, working across time zones, stakeholders, and cross-cultural delivery contexts.
- ▸Operated within Agile/Scrum rituals and Jira/Kanban workflows, enabling continuous delivery and iterative team improvement.
Software Development Intern
Tata Consultancy Services
- ▸Contributed to the Bootcamp 2X2Y training project, building a fraud transaction detection product with 95% accuracy for a simulated banking scenario.
- ▸Developed data transformation and analysis pipelines with Python and Pandas, improving data consistency and analytical value.
- ▸Created and optimized SQL queries for relational databases, enabling efficient extraction and decision-oriented data analysis.
- ▸Supported UI/UX improvements, contributing to more intuitive workflows and better user experience.
- ▸Strengthened problem-solving, communication, and collaboration skills in a fast-paced learning environment.
IT Support Technician
Receita Federal
- ▸Created user documentation and procedural guides for recurring technical workflows, reducing the need for in-person support by approximately 15%.
- ▸Provided hardware and software technical support across internal operations, ensuring stable and efficient IT services within the 9ª Região Fiscal.
- ▸Supported end users with software troubleshooting, system installation, and configuration, improving issue resolution speed.
- ▸Contributed to the creation and maintenance of internal spreadsheets and non-confidential databases, improving information accessibility.
- ▸Assisted in network administration and secure internal information flow, supporting operational continuity.
Skills
Technologies and practices I work with.
Languages
Frontend
Backend
Tools & Platforms
Practices
Contact
Let's build something together
I'm open to new opportunities, collaborations, and interesting conversations. Drop me a line.