Donald Silveira

Built at Levers

• Build the product surface for AI voice agents that run B2B collections calls: configurable agent templates, knowledge-base and post-call-analysis prompts, and live call monitoring for finance teams.
• Designed the call-intelligence analytics that tell customers when to call: outcome heatmaps ranked with empirical-Bayes smoothing, LLM-extracted lead and interest signals, and cached aggregations over call records.
• Engineered realtime streaming of in-flight AI calls (SSE → TanStack Query) with guards against race conditions and cross-tenant leakage.

Built at Casa do Saber

• Led the engineering team through a full-stack platform modernization for Brazil's leading cultural education streaming service.
• Built and shipped a new React Native mobile app from scratch which increased our subscription base from 5k to 10k+ over 9 months.
• Rebuilt the backend from a legacy PHP codebase to NestJS within a new microservice for our payment processing system which increased our conversion rate and reduced payment failures expressively.
• Drove the web platform rebuild using Next.js with a complete UI/UX redesign.
• Built TV and casting device applications, delivering a unified streaming experience across mobile, web, smart TVs, and Chromecast.

Built at CodeLeap

• Developed a SaaS platform for automated video generation using Remotion for the automotive industry.
• Built React Native mobile apps for small businesses, and actively worked on new features, bug fixes, and improvements across other projects.
• Implemented a CircleCI CI/CD pipeline to automatically build, test, and release our React Native app, significantly improving team delivery speed.

Built at Lighthouse

• Led the development of Panvel's new React Native e-commerce app, Southern Brazil's largest pharmaceutical retail chain. Built the full mobile commerce experience from scratch, including product catalog, search, cart, checkout, and loyalty program. The new app 3x'd users and revenue within months of launch.

Built at Moovin Plataforma E-commerce

• Led the development of a price monitor platform which was integrated with the e-commerce platform, helping to optimize pricing strategies and increase competitiveness for the stores.