A software development engineer ( SDE ) is a technical role within a software product company that involves designing, building, and maintaining software applications. SDE -1 vs SDE -2 vs SDE -3: Understand the key differences between these software development roles. Learn about the skills, responsibilities, and career progression at each level. Interested in a software development career in India? Explore the SDE role, salary prospects, and how to kickstart your journey as a successful SDE . Understanding SDE Levels- SDE -1 vs SDE -2 vs SDE -3 Differences SDE -3 focuses primarily on designing, developing, testing, and deploying software and is skilled at dividing tasks such that they can operate in tandem with other SDEs and reassemble into a seamless launch.