Washington’s tech industry hasn’t been immune to the pandemic. Companies such as the IT giant DXC and the event-organizing platform Cvent cut jobs amid the slowdown. But some, including the hot cloud-computing company Appian, committed to hundreds of new hires. Indeed, plenty of other good business news came from Washingtonian’s Tech Titans during the past year. Our 2021 winners—who were selected through both reporting and an informal process of nominations from their peers—managed to start up new and innovative companies, close on huge funding rounds, ink massive contracts, and ann...