Tiso Puccinelli
@tisopuccinelli
Senior frontend software engineer building secure, accessible React products with modern tooling.
BrazilWhat I'm looking for
I’m a Senior Frontend Software Engineer with over 9 years of professional web development experience, grounded in Computer Science and driven by a strong product mindset. I focus on shipping high-impact UI while continuously upgrading engineering quality—performance, reliability, accessibility, and developer experience.
Most recently, I’ve been helping Ledn advance a major cryptocurrency lending platform by implementing compliance improvements across multiple jurisdictions and building stronger authentication flows. I’ve worked on multi-factor authenticator options with hardware keys using WebAuthn, and I’ve paired that with developer experience upgrades like automated tooling to find unused/dead code, code and i18n spellchecking, and better Storybook documentation using MSW mocking.
Previously at Circle, I led the Design Systems team with 4 developers, coordinating cross-functional work across internationalization, accessibility, mobile, and app shell updates. I owned complex front-end initiatives such as a WYSIWYG web editor, full UI overhauls, and migrating a JavaScript codebase to TypeScript, using the latest AI tooling and improving engineering workflows along the way.
Across earlier roles, I’ve delivered greenfield expansions, improved onboarding conversion through registration form enhancements, and migrated legacy pages into Next.js applications to support independent deployments. I’ve also contributed to a design system, revamped E2E testing to reduce CI time and increase reliability, and brought practices like static code analysis, type checking, unit testing/coverage, and visual regression testing into teams I work with.
Experience
Work history, roles, and key accomplishments
Senior Frontend Developer
Ledn
Sep 2025 - Present (8 months)
Advanced a crypto lending platform by implementing jurisdiction-specific KYC flows and enhancing user security with hardware-key MFA via WebAuthn. Improved developer experience by adding automated dead-code detection, i18n spellchecking, and better Storybook documentation with MSW mocking.
Led the Design Systems team (4 developers) and delivered cross-functional frontend changes across internationalization, accessibility, mobile, and app shell updates. Owned complex frontend initiatives including a WYSIWYG web editor, UI overhauls, and migrating a JavaScript codebase to TypeScript using AI-assisted tooling.
Helped build an all-in-one community platform for creators and brands, owning features such as automated workflows, theme customization, dark mode, and content internationalization. Strengthened developer experience by adding automated checks, improving component APIs, and introducing TypeScript, visual regression testing, and design systems.
Senior Frontend Developer
Zemble
Jul 2021 - Feb 2022 (7 months)
Worked on a greenfield effort to expand the product into new markets by collaborating with Product and Design to deliver React + TypeScript features and Design System components. Mentored junior developers and raised code quality in CI with static analysis, type checking, unit tests, and improved coverage; also contributed an open-source enhancement involving path-finding algorithms and programmat
Senior Frontend Developer
PagSeguro PagBank
Jan 2020 - Jun 2021 (1 year 5 months)
Improved onboarding registration by enhancing registration form flows to increase user conversion. Migrated existing pages to Next.js to decouple from legacy monolithic architecture and enable independent deployment, while contributing composable Design System components and revamping E2E testing to reduce CI time and improve reliability.
Full-Stack Software Developer
Pagar.me
Jan 2018 - Jan 2020 (2 years)
Built external REST API features and implemented requirements for BACEN compliance to support reliable service operations. Upgraded a Node.js monolith with extensive testing/refactoring for a safe deploy, improved developer experience with newer language features, and helped develop React dashboard components for a Stone Group open-source dashboard.
Delivered client applications and integrations using IBM Watson cognitive services, including creating and training conversational trees for chatbots. Developed and maintained IBM internal pages with design standards, including accessibility, internationalization, and quality control, and built internal tooling to detect common accessibility and style issues.
Education
Degrees, certifications, and relevant coursework
Universidade São Judas Tadeu
Bachelor's degree, Computer Science
2014 - 2015
Completed a Bachelor's degree in Computer Science at Universidade São Judas Tadeu from 2014 to 2015.
Fundação Armando Alvares Penteado
Bachelor's degree, Information Technology
2011 - 2013
Completed a Bachelor's degree in Information Technology at Fundação Armando Alvares Penteado from 2011 to 2013.
Tech stack
Software and tools used professionally
Availability
Location
BrazilAuthorized to work in
Job categories
Skills
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