Open to opportunities

Tiso Alvarez

@tisoalvarez

Message

Front-end engineer and lead builder of scalable React experiences, delivering reliable, accessible products.

Brazil

Message

What I'm looking for

I’m looking to lead front-end engineering that ships reliable, high-performance products—building scalable React/TypeScript systems, strong design systems, and trustworthy E2E testing. I enjoy collaborating closely with backend teams and using AI to improve user experiences.

I’m a software engineer with 10+ years of experience and an emphasis on front-end development. I’ve built and shipped user-facing applications with high design and accessibility standards, including work delivering IBM Watson-powered conversational experiences.

In recent roles, I’ve transformed products by migrating web applications to React, improving reliability through end-to-end testing, and building scalable UI components. At Ledn, I led development of a high-performance, responsive frontend for a payroll financing platform, integrating secure, low-latency APIs and optimizing complex financial workflows for clarity and speed.

I’m especially motivated by engineering that raises the bar for teams—introducing TypeScript adoption, visual regression testing, design systems, and quality standards through static analysis and stricter testing. I also enjoy enhancing experiences with AI integrations (including OpenAI) and turning complex requirements into products people can use confidently.

Experience

Work history, roles, and key accomplishments

Current

Lead Front-End Engineer

Current

Ledn

Feb 2025 - Present (1 year 5 months)

Developed a high-performance, responsive frontend for Ledn’s payroll financing platform, enabling businesses to access funds within 24 hours via a seamless multi-step application flow. Built scalable UI components and integrated low-latency backend APIs, plus OpenAI features to enhance user interactions.

Next.js TypeScript Redux UI Components AWS OpenAI Integration Responsive UI

Lead Front-End Engineer

Circle

Oct 2022 - Feb 2025 (2 years 4 months)

Introduced TypeScript, visual regression testing, and design systems to significantly improve developer experience. Built a WYSIWYG theme editor and enabled multi-language product releases by moving platform text to translatable strings.

TypeScript Visual Regression Testing Design Systems WYSIWYG JavaScript CSS

Senior Front-End Developer

Zemble

May 2021 - Sep 2022 (1 year 4 months)

Partnered with product and design to introduce new features and design system components. Improved code quality through CI static analysis, strict type checking, and unit testing/coverage, and contributed an open-source enhancement involving path-finding and programmatic SVG rendering.

React TypeScript ESLint Storybook Unit Testing Visual Regression Testing AWS Code Review

Senior Front-End Developer

PagSeguro Digital

May 2020 - Sep 2021 (1 year 4 months)

Improved registration flow performance by increasing user conversion and reducing support calls. Revamped the E2E testing suite to reduce CI/test time and improve reliability, while migrating pages to Next.js and extending the company design system.

Next.js React JavaScript Redux Storybook Jest E2E Testing ESLint Design Systems Docker

Full-stack Developer

Pagar.me

May 2018 - Apr 2020 (1 year 11 months)

Implemented external REST API features and BACEN-driven requirements for new banking/financial compliance needs. Upgraded a Node.js monolith with extensive testing and refactoring for safe deployment, and collaborated with the frontend team to build components and pages for a new open-source React dashboard.

PostgreSQL MongoDB React Redux Sequelize Mongoose REST APIs E2E Testing

Full-stack Developer

IBM

Apr 2016 - Apr 2018 (2 years)

Delivered client applications and integrations using IBM Watson cognitive services, including creating and training conversational trees for chatbots. Built IBM internal pages within design/accessibility standards and developed internal quality-control tools for new page releases.