Engineering better ways to grow businesses.
I build AI-powered systems that turn cold outreach into qualified B2B clients — with a human touch.
B2B companies served
Average client rating
Qualified clients a month
Clients based in the US
Source: celestic.io
AI reads every lead’s website and LinkedIn before a single email goes out.
Every opener is written for one person. No template can fake it.
Dedicated domains, warm-up and daily management, in the client’s brand.
Clients only pay when a real, ICP-matching lead shows interest.
Illustrative example with a fictional lead.
Relevance over volume.
Personalization over spam.
Bernat and I started with online stores and learned digital marketing by doing: more than 20,000 orders shipped. Then a logistics crisis forced us to refund over 200 — and taught us that growth without operations is dangerous.
Before generative AI went mainstream we were already shipping: a Shopify app that answered order questions by itself, and Tok Reviews, which brought TikTok video reviews into online stores.
Our marketing agency taught us something unexpected: we were better at booking meetings for ourselves than at anything else. Demand saturated us within months, so we pivoted to pure lead generation.
One recorded pitch, automatically adapted to show each prospect’s own website. Every company got a video made just for them — and the replies proved what real personalization can do.
We turned the systems that filled our own calendar into a managed service. Today we run international campaigns for B2B companies — in the US, Switzerland, the Netherlands, Australia, the UAE and Spain, among others — with the US as our home market.
From our first online store to Celestic, Bernat and I have built everything side by side. Being family doesn’t make us less professional — it makes us a stronger team: complete trust, the same values, and someone who carries the weight when you can’t.
Before being partners, we’re brothers. That always comes first.
Born in Barcelona. Moving to Dubai was about taking Celestic to the next level: more clients, a bigger stage, and a city where the world’s most ambitious people are building right now.
A laptop, a coffee and a good view. Celestic runs from wherever I am.
Testing new models, agents and tools is also a hobby.
Nothing makes sense without health first. Strength training, sleep and discipline — and the intersection of health and technology, which fascinates me.
Every country is a different way of seeing the world. Some better, some worse — all of them open your mind.
Loyalty, reciprocity and being there for those who matter.
On meaning, resilience and choosing how to respond.
Ambition, and the nerve to start from zero again when he could have retired. He warned about AI risk a decade before it was fashionable.
Proof you can build businesses without trading away your health — with a goal bigger than himself: longer, healthier lives for everyone.
Professional updates, Celestic news and the most direct way to start a conversation.
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Marc DiezAn entrepreneur and software engineer from Barcelona, Co-Founder and Managing Partner of Celestic, based in Dubai.
He applies software engineering, AI and automation to B2B growth: Celestic books qualified sales meetings for companies, mainly in the US.
Brothers Marc Diez Guasch and Bernat Diez.
A fully managed B2B outbound lead generation company based in Dubai, working mainly with companies in the United States.
Barcelona, Spain. He now lives and works in Dubai, United Arab Emirates.
He studied Computer Engineering at Universitat Rovira i Virgili and holds the CompTIA Security+ certification.
With e-commerce alongside his brother Bernat, then software products, the Hustline Media agency, and finally Celestic.
Family, AI, health and longevity, training, travel, and different cultures.
By email at marc@marcdiez.me, through LinkedIn, or via Celestic’s website.
Email is the most direct way to reach Marc; LinkedIn works too. For Celestic, book a free 15-minute call on celestic.io.