Hello, I'm
João Víctor Arantes
Sr. Frontend Engineer
I create clean, usable interfaces that make the web easier for everyone
Experience
Sr. Frontend Engineer
TrustCloud
2025 - Present
Building scalable, user-friendly frontend applications for TrustCloud, a SaaS platform that automates compliance and audit readiness. My work strengthens performance and usability for companies in highly regulated industries.
Mid-Level Frontend Engineer
Mercado Libre
2024 - 2025
Contributed to Mercado Libre, the largest e-commerce and fintech ecosystem in Latin America, serving 400M+ users. Improved frontend performance and usability in a complex React/Next.js microservice environment, enhancing scalability and user experience across the platform.
Full Stack Engineer (Jr. to Mid-Level)
HSystem
2020 - 2024
At HSystem, a leading hospitality software provider with 2,000+ hotel clients, I built and optimized booking and website tools. Key achievements include making multi-room reservations up to 10× faster, cutting website load times by 60%, and boosting system processing speed by 80%.
Education
Universidade Federal de Santa Catarina
Bachelor of Information Systems
2019 - 2023
Very embracing coursework, from more basic subjects like Object Oriented Programming, Data Structures, Databases, Software Engineering all the way to Operating Systems, Computer Networks, Usability Engineering, Data Mining. Final project on React Native and NodeJS with Express, and Expo for the development.
Tech Stack
Projects
Newsly
Co-founded Newsly, the Brazilian Email Marketing Library, a platform to find references, analyze competitors, and create more effective campaigns. As Principal Frontend Engineer I built the frontend: Next.js 14 app with React 18, shadcn/ui, TanStack Query, React Hook Form + Zod, Framer Motion, Zustand, and Tailwind. Monitored with Sentry.
trigo etc
A mobile-first ordering PWA built for trigo etc, an artisanal bakery in Florianópolis. Customers browse the menu, build a cart, and place an order that's handed off to WhatsApp to confirm — no payment friction. Ships with a Google-gated admin panel to manage sections, products, and orders, plus a custom data-caching layer. Built for a local business, so the UI is Portuguese-only.
StayRank
Plan a trip with friends and agree on where to stay. Everyone ranks their top 3 accommodations per city with a note, and StayRank tallies the votes into a leaderboard so the group can see the option they agree on the most. Installable PWA with Google sign-in and link-preview images.
GitHub
Yieldly
A personal finance tracker focused on investment yields. Log balances across accounts, record deposits and withdrawals, and watch your daily yield and total balance trend over time with clean charts. Money is handled in integer minor units for precision, behind a roles-based authorization layer.
Wild.io
This was my final college project! It fosters public engagement with city parks, encouraging the documentation of urban flora and fauna.
