Began working in the advertising industry in 2005 at BBDO agency. Later worked at Grey Group and Young & Rubicam. Since 2015 leads a multidisciplinary team at Tribe Riga Agency.

Worked with the world and local brands and companies: Nike, GM, BMW, Jaguar, Mini, Subaru, Coca-Cola, Colgate-Palmolive, Nokia, Land Rover, GlaxoSmithKline, NASDAQ, mail.ru, airBaltic, Danone. Gatis directed advertising campaigns and creative solutions later shortlisted and marked by international advertising awards Golden Hammer, AdWards, BestBaltic, and also included in Jean Marie Boursicot's collection "The Night of the Adeaters".

Many times worked as a member of the jury at advertising festivals Cannes Young Lions Georgia, AdWards, LisbonAdFestival, KIAF, White Square AdFest, AdBlackSea, Tagline Awards, Fakestival, where gave talks and shared his insights and experience.

Gatis is a frequent guest speaker in universities, advertising and design-themed meetings and events. He also teaches workshops on creativity and digital and magazines publish his articles on innovations, strategies and creative thinking.

Gatis focuses on new technologies that can change the world perspective, their development, and application. His portfolio features interactive exhibitions, social apps, hi-tech campaigns.

Rozenfelds often meets with creative agency founders, creative directors, and designers to talk about work, development, and experience. These interviews are available on Gatis's YouTube channel.