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Meet the People Behind Celtrino

At Celtrino, everything we do starts with you—the customer. We know– it’s a bit of a cliché.
We’re the first to admit—we don’t always get it right first time.

But what we do get right is our commitment to learning, listening, and trying again.
We’re guided by a simple question: “If I’m not directly servicing the customer, am I supporting someone who is?”

Your success is what drives us to improve every day. We know it’s not always easy.

None of this would be possible without our people.
They’re the ones who make things happen—finding solutions, supporting each other, and keeping us moving forward, even when things get tough.
It’s their effort, creativity, and teamwork that drive everything we do for our customers.

We believe that collaboration, showing up every day to improve,
and having some craic along the way is how we build trust—with our team and with you.

Managing Director

Sebastien Weyland

Sebastien Weyland is an experienced growth and business leader with a strong track record in scaling SaaS companies. As Celtrino Managing Director he focuses on driving strategic expansion and operational excellence.

Sebastien Weyland is an experienced growth and business leader with a strong track record in scaling SaaS companies. As Celtrino Managing Director he focuses on driving strategic expansion and operational excellence.
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Chief Operating Officer

Juby John

Juby, our COO since 2020, manages Celtrino’s technical operations across Ireland and India. With nearly two decades at Celtrino...

Juby, our COO since 2020, manages Celtrino’s technical operations across Ireland and India. With nearly two decades at Celtrino, Juby knows our business inside and out. He’s built high-performing teams that focus on seamless customer experiences and growth. Always hands-on, Juby’s motto is “no customer is waiting on operations” — a mantra he is committed to. Outside work, he’s adding an Executive MBA to his list of achievements.
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Finance Manager

Vishnu Asok

Vishnu is the numbers wizard at Celtrino, balancing our books with precision and a smile. Whether it’s managing budgets or tracking costs...

Vishnu is the numbers wizard at Celtrino, balancing our books with precision and a smile. Whether it’s managing budgets or tracking costs down to the penny, he’s always got an eye on the financials. Known for his calm demeanor, Vishnu’s superpower is making even the toughest financial challenges look easy (and making the rest of us look a little better in the process!).
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Director of Customer Service, Project & Delivery Excellence

Mark Fairweather

With over 30 years dedicated to customer service and IT solution delivery, Mark’s our expert in managing expectations—both clients’...

With over 30 years dedicated to customer service and IT solution delivery, Mark’s our expert in managing expectations—both clients’ and our own. Skilled in resource planning and deadline management, Mark’s the kind of project leader everyone wants on their team. Outside the office, he’s often working on improving processes, though he insists it’s just his way of keeping things interesting.
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Head of Technology

Frank Halligan

Frank joined Celtrino over 14 years ago as an intern and has climbed the ranks to Head of Technology. Known for his innovative...

Frank joined Celtrino over 14 years ago as an intern and has climbed the ranks to Head of Technology. Known for his innovative mind and dedication to reliability, Frank oversees our tech strategy, architecture, and infrastructure. He’s always pushing the envelope with a passion for quality, making sure our clients get the best tech solutions around. When he’s not buried in code, Frank is literally going the extra mile—or rather, all 26.2 of them—as he runs marathons across Europe.
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Infrastructure Engineer

Julio Melo

Julio, our infrastructure mastermind, has been with Celtrino for 7 years, after spending time with Microsoft. Leading our network team...

Julio, our infrastructure mastermind, has been with Celtrino for 7 years, after spending time with Microsoft. Leading our network team, he’s committed to building resilient systems that can handle anything. Julio’s focus is on process improvement and service quality, ensuring that our infrastructure grows as we do. When he’s not optimising systems, he’s hill walking in Sligo loving the Irish climate over the Brazilian rainforest.
Director of Marketing

Rav Sidhu

With 15 years dedicated to mastering the art and science of growth, Rav is a Director of Marketing focused on the future...

With 15 years dedicated to mastering the art and science of growth, Rav is a Director of Marketing focused on the future. He specialises in designing and implementing full-funnel strategies that utilise AI and sophisticated automation to move prospects from awareness to conversion efficiently.

Rav’s success is built on his ability to integrate high-touch outbound efforts with data-driven inbound content, ensuring every marketing dollar directly impacts the bottom line.

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Fast UK EDI Onboarding, Fully Managed from Day One

Where others slow you down, we don’t: get expert onboarding, live support, and instant, one-to-one issue resolution.

✅ Onboard fast, no needless delays
✅ Speak to real experts, not bots, queues or dead-end tickets
✅ Clear, upfront pricing, no nasty surprises
✅ Works seamlessly with your ERP, accounting or warehouse systems

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+44-(0)-283-889 7106

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Celtrino Locations: Dublin, Ireland  | London, UK  |  Kochi, India

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