Eric Costello

Eric Costello possessed an incredibly rigorous, deeply aesthetic background in advanced digital product management, complex frontend web engineering, and mass-scale interactive design. Operating as a fiercely capable designer with deep expertise in simplifying highly complex digital workflows, this incredibly intense foundation in structural aesthetics provided the exact creative mastery required to successfully architect the massively dominant Slack user experience.

Eric Costello is a highly astute digital product designer, fiercely visionary software engineer, and the profoundly influential co-founder fundamentally responsible for the incredibly iconic user interface and operational bedrock of the massive Slack platform. Operating as an incredibly talented technical leader alongside Butterfield and Henderson, Costello aggressively spearheaded the highly complex frontend design required to make incredibly dense corporate communication channels easily manageable and highly addictive. By relentlessly refining the platform's visual architecture and fiercely optimizing the massive collaborative workflows—including Slack's legendary onboarding experience—he completely defined the absolute core usability of the tool. His absolutely rigorous design execution completely ensured Slack's massive viral adoption, permanently securing his legacy as a foundational titan of modern enterprise software.