
- Digital Transformation
- Go-To-Market Strategy
- Bespoke Training Solutions
Business Consulting Solutions
GTM Strategy
Designed for SMBs willing to enhance their GTM strategy with focus on building new sales pipeline.
Mentoring & Business Coaching
For entrepreneurs and employees who require support in the design and implementation of business and marketing strategies.
Mystery guest / user / shopper
We support companies willing to validate sales and customer service performance (both online and in-store)
Market Development
We help American companies willing to open the UK, UAE and European markets, and companies from the UK, Europe and UAE willing to open the American market.
Training Solutions
Mindfulness for Leadership
Built for C-level and Directors aiming to improve their leadership and goal alignment skills.
GTM Strategy
Offers guidance for creating a winner Go-To-Market strategy, focusing on pipeline building and marketing.
Stop selling and start closing
Built for hunters aiming to elevate their new logos acquisition performance and for farmers willing to build and execute successful CLTV-oriented growth plans
Mindfulness For Life
Built for anyone seeking to enhance performance, cultivate stress-reducing habits, and adopt mindsets that support both entrepreneurial and employee roles.

Julián Sierra
International bilingual business advisor with 20 years of experience helping companies worldwide enhancing their commercial and marketing initiatives and empowering C-Level professionals to succeed. Extensive experience developing and executing innovative GTM strategies across EMEA, The UK and Americas regions. Deep understanding of the digital and data management landscapes, effectively driving change within culturally complex organisations facing challenges embracing business transformation
¨Callisto is a new startup specialising in business transformation and the expedited automation of business process to improve outcomes and reduce costs. Julian has been invaluable in providing guidance and expertise in the formation of a go to market strategy and market segmentation in order for a predominantly technologist organisation to reach a suitable target audience.
Julian has specific skills in internet marketing but it is the clear and logical progression of idea to go to market strategy formation that is most impressive.¨

I had the pleasure of working with at Kaleyra. Julian is an incredibly hardworking salesperson whose dedication and work ethic are second to none. His ability to cultivate and maintain a broad and impressive network is a testament to his highly personable and engaging character, making him a valuable asset in any sales environment.
Julian’s approach to defining and managing his sales territory is meticulous and grounded in solid research and data points. He prioritizes effectively and develops clear, actionable engagement plans that drive results. His business development behaviors are exemplary.
One of Julian's standout qualities is his ability to identify challenges and proactively present creative solutions. This problem-solving mindset, combined with his unwavering commitment and team-player mentality, makes him a pleasure to work with. He consistently contributes to a positive team dynamic and is always willing to go the extra mile to support his colleagues and achieve common goals.
In summary, Julian's impressive network, strong work ethic, and strategic approach to sales, combined with his problem-solving abilities and collaborative spirit, make him an outstanding candidate for any sales role. I have no doubt that he will continue to excel and bring significant value to any organization fortunate enough to have him on their team.

Julian is an incredibly diligent and hard working sales person. His network is impressive, though unsurprising given his highly personable and engaging character. Julian takes no short cuts in the definition and management of his sales territory. Whilst at Acoustic this was grounded in solid research and underlying data points, well prioritised with a clear engagement plan. His business development behaviours are strong, with a ‘roll-up the sleeves’ approach to building pipeline, leaving no stone unturned. Julian would never surface a challenge without also tabling creative solutions - this being an admirable quality that coupled with his commitment and team-player mentality, make him a pleasure to be around.

I thoroughly enjoyed working with Julian. He has a great work ethic and stuck to the task. I hope to work with him again in the future.
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