Senior Frontend / Full-Stack Engineer with over 6 years of experience designing, building, and scaling high-impact web platforms for fintech, SaaS, and data-driven products. Strong expertise in modern frontend technologies including React, Next.js, Angular, TypeScript, and Server-Side Rendering (SSR), combined with solid backend experience using Node.js, GraphQL, and RESTful APIs. I have a proven track record of delivering reliable, high-performance systems in complex and regulated environments, including financial platforms and large-scale SaaS products. My work has included leading architectural improvements, decomposing frontend monoliths into maintainable modules, and driving significant performance gains that improved user experience and system scalability. I work closely with product, design, and data teams to translate business requirements into clean, maintainable solutions, and I actively contribute to engineering best practices through code reviews, design systems, testing, and performance optimization. Experienced in remote and international teams, including US-based companies, and comfortable collaborating across time zones. Fluent in English and French, with a strong product-oriented mindset and a focus on long-term code quality and team success.

Leonardo Campadelli

Senior Frontend / Full-Stack Engineer with over 6 years of experience designing, building, and scaling high-impact web platforms for fintech, SaaS, and data-driven products. Strong expertise in modern frontend technologies including React, Next.js, Angular, TypeScript, and Server-Side Rendering (SSR), combined with solid backend experience using Node.js, GraphQL, and RESTful APIs. I have a proven track record of delivering reliable, high-performance systems in complex and regulated environments, including financial platforms and large-scale SaaS products. My work has included leading architectural improvements, decomposing frontend monoliths into maintainable modules, and driving significant performance gains that improved user experience and system scalability. I work closely with product, design, and data teams to translate business requirements into clean, maintainable solutions, and I actively contribute to engineering best practices through code reviews, design systems, testing, and performance optimization. Experienced in remote and international teams, including US-based companies, and comfortable collaborating across time zones. Fluent in English and French, with a strong product-oriented mindset and a focus on long-term code quality and team success.

Available to hire

Senior Frontend / Full-Stack Engineer with over 6 years of experience designing, building, and scaling high-impact web platforms for fintech, SaaS, and data-driven products. Strong expertise in modern frontend technologies including React, Next.js, Angular, TypeScript, and Server-Side Rendering (SSR), combined with solid backend experience using Node.js, GraphQL, and RESTful APIs.

I have a proven track record of delivering reliable, high-performance systems in complex and regulated environments, including financial platforms and large-scale SaaS products. My work has included leading architectural improvements, decomposing frontend monoliths into maintainable modules, and driving significant performance gains that improved user experience and system scalability.

I work closely with product, design, and data teams to translate business requirements into clean, maintainable solutions, and I actively contribute to engineering best practices through code reviews, design systems, testing, and performance optimization. Experienced in remote and international teams, including US-based companies, and comfortable collaborating across time zones. Fluent in English and French, with a strong product-oriented mindset and a focus on long-term code quality and team success.

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Language

Portuguese
Fluent
English
Advanced
French
Advanced

Work Experience

Full‑Stack Engineer at Cherre
October 31, 2024 - November 30, 2025
● Contributed to a data-intensive real estate SaaS platform, enabling new product oferings and scalable data workflows ● Designed and owned frontend architecture patterns in React, improving consistency, maintainability, and long-term scalability ● Built and optimized GraphQL queries and mutations using Python to support eficient data access across services ● Introduced design system foundations and Storybook, accelerating development and improving cross-team alignment ● Partnered closely with product and data teams to translate complex business requirements into scalable technical solutions ● Participated in architectural discussions influencing platform scalability and data access strategies
Software Engineer at Mercado Livre
October 31, 2022 - September 30, 2024
● Led the design and rollout of a new SSR-based frontend architecture for critical financial platforms ● Drove the decomposition of a frontend monolith into responsibility-based modules, improving scalability and team ownership ● Reduced initial page load times from ~1200 ms to 200–300 ms, significantly improving user experience ● Delivered end-to-end solutions across frontend and backend, including mobile-first webviews ● Worked on regulated, high-availability fintech systems, including electronic funds transfer and Open Banking platforms ● Collaborated across frontend, backend, mobile, and product teams to safely deliver complex features at scale
Expert (Instructor / Mentor) at Tera
May 1, 2022 - May 1, 2023
Acted as a technical expert supporting students and professionals in frontend and product engineering topics.
Mid‑Level Frontend Developer at Pipefy
June 30, 2021 - August 31, 2022
● Built and scaled SaaS features using React, GraphQL, Apollo Client, and Jest ● Improved frontend scalability through reusable components and improved state management ● Collaborated closely with backend teams contributing to Ruby on Rails services ● Supported product teams with reliable, maintainable frontend solutions
Mid‑Level Software Developer at Flash Benefícios
November 30, 2020 - May 31, 2021
● Built and scaled internal management platforms supporting core fintech operations ● Designed scalable frontend architectures using React and Redux Saga, improving reliability and developer productivity ● Implemented Node.js backend services with Apollo Server and MongoDB, enabling eficient data flows ● Contributed to automated testing and code quality initiatives ● Delivered end-to-end solutions in a fast-paced startup environment
Frontend Developer at Wavy Global
March 26, 2019 - November 25, 2020
● Developed and maintained a large-scale enterprise messaging platform using Angular, TypeScript, and RxJS ● Built complex, reactive user interfaces with Redux-style state management, ensuring performance at scale ● Integrated frontend applications with backend APIs and AWS S3 ● Contributed to backend API development using Elixir and PostgreSQL ● Delivered high-reliability features in a real-time communication environment

Education

Bachelor of Electrical & Electronic Engineering at University of São Paulo (USP)
January 1, 2013 - January 1, 2019
Electrical & Electronic Engineering (Exchange Program) at Université de Poitiers
January 1, 2015 - January 1, 2016
Technical Degree in Computer Science at ETEC Albert Einstein
January 1, 2009 - January 1, 2010
Bachelor of Electrical & Electronic Engineering at University of São Paulo (USP)
January 1, 2013 - January 1, 2019
Electrical & Electronic Engineering (Exchange Program) at Université de Poitiers (France)
January 1, 2015 - January 1, 2016
Technical Degree in Computer Science at ETEC Albert Einstein
January 1, 2009 - January 1, 2010

Qualifications

Digital Product Leadership
January 11, 2030 - December 18, 2025
Digital Product Leadership
January 11, 2030 - December 24, 2025

Industry Experience

Financial Services, Software & Internet, Real Estate & Construction