João Sampaio

Close is an all-in-one CRM that eliminates manual data entry and automates tasks with AI to maximize the time sales professionals spend actually selling.

• Reduced data transfer costs between application servers and MongoDB by 53% by enabling compression and adjusting database configuration.
• Led the team that implemented sales funnel visualization and reporting. 48% of paying customers depend on this feature to evaluate performance of their sales teams, driving up user engagement and retention.
• Application workers could freeze for up to 15 minutes after a database failover. By properly configuring the application and the OS, workers now recover in less than 10 seconds (~90x faster), resulting in increased reliability and improved user experience.
• The email syncing pipeline had several outages per week, causing engineers on call to be paged at any time day and night. Improved reliability by profiling the pipeline and optimizing memory utilization. Outages almost entirely stopped. Morale and productivity went up.
• Implemented an autonomous AI coding agent workflow that enabled developers to run several coding agents simultaneously, generating productivity gains for the entire engineering team.
• Integrated with providers of calendar solutions, paving the way for autonomous AI voice agents capable of scheduling meetings for sales representatives live during unassisted phone calls.

AlayaCare is a provider of revolutionary cloud-based home healthcare software.

• Contributed to the migration of a legacy monolithic codebase in PHP and Symfony to a modern microservices architecture in Python and Flask.
• Implemented billing features that enabled high-granularity analyses of financial transactions, solving long-standing requests from relevant customers.

AdRoll is one of the biggest ad platforms in the world.

• Implemented real-time big data processing topologies using Hadoop, processing many petabytes of data per day.
• Implemented a new interface to onboarding services.