Join the NitroPress Ambassador Program

Cocktail content creator

Italy

Former Head Bartender at Blue Bar, The Berkeley, London, Giovanni is now based in Singapore, where he continues to redefine hospitality with textured, sensory-rich drink experiences.

He has presented creations such as Mirror Martini, Raj by Night, London to Singapore, and The Roadrunner at international cocktail events—leveraging his reputation for precision and creativity to blend bar and café cultures seamlessly.

A passionate creator of experiential drinks like the signature Nitromisu, Giovanni combines coffee, chocolate, cold foam, and nitrogen in sculpted, cinematic servés. His innovative style makes him a perfect match for NitroPress’s texture-first philosophy.

Cocktail content creator

Georgi Petrov, best known online as “Just Shake or Stir”, is a Bulgarian-born cocktail creator and educator who’s built a global following by sharing visually stunning recipes and approachable bartender techniques. Through his platform, he demystifies cocktail making with great clarity - whether you’re shaking a Campari spritz or crafting a sweepingly aromatic Negroni twist.

He teaches everything from foundational bartending skills (stir vs shake, dilution method) to advanced mixology hacks, making it both friendly for beginners and rich in depth for professionals. His passion lies in elevating everyday drinks - turning simple ingredients into creative, flavourful experiences.

Coffee and Cocktail Master

Greece

Rastislav “Rasty” Kasár is a dynamic coffee-and-cocktail virtuoso from Banská Bystrica, Slovakia. After training in hospitality, he honed his craft in some of London’s most iconic bars, including the American Bar at The Savoy, Scarfes Bar, and Kwānt. In 2022, he was crowned London Coffee Masters Champion, and in 2023, he claimed both the UK and World Coffee in Good Spirits titles. Since January 2024, Rasty has been based in Athens as Director of Product Development at Teddy’s Speakeasy & Teddy’s Elixir, where he fuses barista skill with bartender flair to create world-class coffee-cocktail experiences.

Social Media Influencer

United Kingdom

Callum Coles is the creative force behind Calls Cocktails, a popular social media brand dedicated to making homemade cocktails simple, accessible, and delicious. Passionate about mixology and the art of crafting drinks, Callum focuses on easy-to-follow recipes that anyone can recreate at home - no fancy bar tools or rare ingredients required. His goal is to inspire people to enjoy great cocktails with minimal effort, whether they’re entertaining friends or relaxing after a long day.

With a genuine love for flavour, creativity, and sharing experiences, Callum combines his cocktail expertise with his adventurous lifestyle. He’s an avid traveller, car enthusiast, skier, and runner.

Through Calls Cocktails, Callum aims to build a community of cocktail lovers who appreciate simplicity, quality, and the joy of discovery, one delicious drink at a time.