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Mikael Hadler

@mikaelhadler

Message

Senior frontend engineer focused on scalable UI architectures, performance, and developer experience.

Brazil

Message

What I'm looking for

I’m seeking roles where I can lead frontend architecture, modernize UIs, and improve developer experience within collaborative, product-focused teams.

I’m a senior frontend engineer with 10 years building scalable web applications, APIs, and internal developer tools using React, Next.js, Vue, and TypeScript. I specialize in frontend modernization, component libraries, design systems, accessibility-first UIs, and developer experience, driving product adoption and engineering efficiency.

I lead system design for large-scale UI architectures, build BFFs and microfrontends, and integrate test automation and CI/CD to ensure maintainability. Lately, I’ve explored AI-driven development with OpenAI SDK and CrewAI, creating PoCs that bring ML-powered features into production-ready products.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer

Current

LendingClub

Apr 2022 - Present (3 years 10 months)

Designed and built scalable React and Next.js digital products and internal tools, launching multiple banking features adopted by thousands of users and evolving a shared component library to ensure accessibility and test coverage.

React Next.js TypeScript Component Libraries Accessibility CI CD Testing (RTL Cypress)

Senior Software Engineer

Vizir Software Studio

Mar 2021 - Mar 2022 (1 year)

Built full-stack banking applications and micro frontends (Module Federation) for Vizir Bank using React, React Native and Node.js, enabling clients such as Natura to launch branded banking apps.

React React Native Node Module Federation TypeScript Redux Jest

Senior Software Engineer

Will Bank

Sep 2020 - Mar 2021 (6 months)

Developed internal web and mobile systems for fintech operations using React, NestJS and Ant Design, contributed backend microservices migration and implemented i18n to support multi-language users.

React NestJS TypeScript Redux Ant Design Storybook Jest

Senior Software Engineer

Inflor

Jun 2019 - Nov 2019 (5 months)

Led modernization of legacy web apps with Vue.js and micro frontend architecture, delivering modular, maintainable components and CI/CD practices that reduced technical debt and accelerated delivery.

Vue.Js Vuex Vuetify REST APIs CI CD Azure DevOps

Software Engineer

Ilegra

May 2018 - Mar 2019 (10 months)

Developed responsive web applications with Vue.js, React and AngularJS, implemented BFF solutions and TDD-based testing strategies to improve reliability and performance across client projects.