William Fernandes

• Led the development and design of a new ticketing platform, including website and mobile apps (Android, iOS and Android PoS) for customers and sellers, integrated with multiple payment providers: PagSeguro, Getnet, MercadoPago.
• Built the website using Laravel, React.js, Inertia.js and TailwindCSS, resulting in a faster, more responsive UI and reducing page-to-page load times by over 60% compared to a traditional MPA.
• Developed multiple React Native apps with Nativewind optimized for performance and support for Android, iOS and Android PoS devices.
• Designed and maintained a shared component library with a custom design system used across all mobile apps, improving consistency and development speed.

• Architected and developed a full social media and e-learning mobile platform for artists and art enthusiasts using React Native, TailwindCSS (Nativewind), Node.js and Firebase (Firestore, Cloud Functions, Cloud Storage).
• Built a real-time group chat feature with invites, multimedia and low latency live streaming via CDN.
• Built a post feed with support for text, image, and video posts. Implemented media upload to a global CDN with progress tracking, resumable uploads and compression reducing the storage and bandwidth costs up to 80%.
• Designed and integrated a AI assistant by fine-tuning a LLM to support students with homework tasks without providing direct answers. This boosted the teacher-student support capacity by 5x.

• Rebuilt the event producer dashboard to significantly improve performance, usability, and user experience using React.js and TailwindCSS.
• Achieved a 10x improvement in reports page load time using Laravel, applying smart caching with Redis, optimizing MySQL indexes, rewriting slow queries and using eager loading to minimize N+1 issues.
• Rebuilt the sales website front-end with React.js, Inertia.js and TailwindCSS to improve in more than 50% the page loading and navigation. Used Radix UI primitives to deliver a more accessible and polished interface, making it easier to manage reports and key platform features.
• Audited and updated project dependencies via NPM and Composer to fix security issues and outdated packages.

• Led the design, architecture and development of multiple platforms: a web ticketing system, event producer dashboard, mobile sales apps for promoters, and real-time validation app. Used Laravel, Node.js, React.js and React Native, and deployed most services on AWS.
• Played a key role in transforming the company from a small startup with a basic web service into a robust, multi-app ecosystem handling nationwide events, growing revenue from R$ 1M to over R$ 40M/year.
• Integrated web and mobile apps with major Brazilian payment providers: PagSeguro, Cielo, Safra, and Getnet.
• Built React Native apps for low-end Android PoS devices, including a custom Java modules to maximize performance between RN threads, ensuring stability during high-volume operations, like real-time ticket validation on event openings.
• Developed a real-time offline-first ticketing app in React Native for Android PoS devices used on event floors, enabling hight-speed on-site sales and boosting revenue event without consistent internet access.
• Engineered a scalable batch and queue system in Laravel to import and process millions of third-party tickets (e.g., from Sympla, Ticket master) without overloading the servers.
• Developed a mobile-first web app (PWA) for external promoters, enabling ticket sales from any device without app installation, expanding the company's distribution network and driving higher sales.

• Built a cloud-based, multi-tenant internal system using Laravel and JavaScript to replace a legacy desktop solution across multiple company branches in different cities, reducing operational costs by over R$ 5,000 per month.
• Migrated all core features, added new custom functionalities including a new parts supply and inventory management system, reducing inventory errors by 40% and speeding up restocking operations by 100%, significantly boosting operational efficiency.

• Modernized the company’s front-end using jQuery and SASS, implementing a consistent design system with cross-browser compatibility and visual consistency across the platform.
• Delivered a fully mobile-first, responsive layout, an important achievement at a time when mobile optimization was just becoming essential.
• Gained foundational experience in modern front-end practices, responsive design, and cross-browser compatibility.

Universidade Estadual da Bahia (UNEB)

Bachelor of Systems Information

2015 - 2019