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Leonardo MüllerLM
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Leonardo Müller

@leonardomller

Frontend engineer at Compass UOL building Livelo’s hotel booking experience across Next.js and React Native with maps and nearby points of interest.

Brazil
Message

At Compass UOL, I work on Livelo’s hotel booking experience across Next.js micro-frontends and the React Native app. I integrated Google Maps and nearby points of interest so customers can compare properties without leaving the booking flow.

For PicPay, I built the bank’s first web channel in Next.js, including Keycloak/OAuth2 authentication and a TED transfer flow with QR-code MFA. The channel was scoped as read-only, shipped as a transactional channel, and remains in production.

At Compass UOL for UOL EdTech, I led the frontend migration to AWS Cognito and Microsoft SSO for a multi-tenant platform serving three universities. I also led a five-person frontend team, with responsibility for technical decisions, code reviews, and delivery planning.

At Fockink, I built React applications for grain-storage monitoring and control, including real-time thermometry, alerts, remote aeration, and 3D visualization. I also trained more than 90 developers as a frontend instructor.

Experience

Work history, roles, and key accomplishments

CU
Current

Frontend & Mobile Software Engineer

Compass UOL

Oct 2025 - Present (1 year)

Integrated interactive Google Maps and nearby points of interest into the hotel booking flow across Next.js micro-frontend and React Native app. Improved micro-frontends and React Native app on new v2 BFF contract, reworking data flows and expanding filtering.

CU

Frontend Software Engineer

Compass UOL

Apr 2023 - Sep 2025 (2 years 5 months)

Built the bank's first web channel from scratch in Next.js with Keycloak/OAuth2 authentication and TED transfer flow with QR-code MFA. Redesigned merchant panel in Angular and contributed accessible components to the design system.

CU

Frontend Software Engineer (Tech Lead)

Compass UOL

Aug 2022 - Mar 2023 (7 months)

Led frontend migration to AWS Cognito with Microsoft SSO via identity federation, implementing OAuth2 flow with refresh-token handling. Led a 5-person frontend team, owning technical decisions and delivery planning.

FO

Frontend Developer – Research & Development

Fockink

Feb 2022 - Aug 2022 (6 months)

Built monitoring and control application in React and TypeScript with real-time thermometry, alerts, and 3D visualization using Babylon.js. Maintained Go BFF and onboarded two new frontend developers.

FO

Frontend Developer / Automation Technician

Fockink

Jul 2019 - Feb 2022 (2 years 7 months)

Built React and Node.js dashboard for photovoltaic equipment with real-time visibility. Developed SCADA supervisory interfaces with plant-layout representation and alarm management.

Education

Degrees, certifications, and relevant coursework

Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul (IFRS) logoII

Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul (IFRS)

Technologist Degree, Internet Systems

2021 - 2023

Technologist Degree in Internet Systems from IFRS, Brazil, from 2021 to 2023.

UNINTER logoUN

UNINTER

Bachelor of Engineering, Electrical and Electronic Engineering

2015 - 2021

Bachelor of Engineering in Electrical and Electronic Engineering from UNINTER, Brazil, from 2015 to 2021.

CP

Colégio Evangélico Panambi

Technical Degree, Electrotechnics

2010 - 2014

Technical Degree in Electrotechnics from Colégio Evangélico Panambi, Brazil, from 2010 to 2014.

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