More about Marek Roostar
Marek has 20 years of B2B sales & marketing experience. Last 10 years he’s been working with innovative technology start-ups like Timbeco (smart construction), Cleveron (robotics) and Elcogen (cleantech & renewables). He is true believer in process thinking and enthusiast of personality psychology.
Marek’s main role has been to drive growth of start-ups on export markets. In some cases, it involved leading the changes inside the company, in some cases it involved international marketing and sales strategy development and in some cases it involved communications and branding formation.
Marek's current role is to drive growth of Elcogen - an Estonian cleantech start-up, one of the leading European hydrogen technologies (SOFC/SOEC) developer and manufacturer. Winner of Innovation at European Business Awards 2019, Innovator of Estonia 2020. Marek' customer portfolio includes global brands from energy, automotive and utility industries, mostly from Japan, S-Korea, China and USA markets.
Marek’s main role has been to drive growth of start-ups on export markets. In some cases, it involved leading the changes inside the company, in some cases it involved international marketing and sales strategy development and in some cases it involved communications and branding formation.
Marek's current role is to drive growth of Elcogen - an Estonian cleantech start-up, one of the leading European hydrogen technologies (SOFC/SOEC) developer and manufacturer. Winner of Innovation at European Business Awards 2019, Innovator of Estonia 2020. Marek' customer portfolio includes global brands from energy, automotive and utility industries, mostly from Japan, S-Korea, China and USA markets.
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The eChai Effect - In Their Words
"From late-night brainstorming over chai to early morning founder calls, eChai has been more than just a network for me; it’s been home base for ideas, impact, and inspiration. What started as a simple meetup years ago turned into a powerful movement, connecting founders, creators, and dreamers. I’ve had the privilege of seeing startups find product-market fit, marketers (like me) find unexpected collaborations, and most importantly, people finding their tribe. संगच्छध्वं संवदध्वं – Let us move together, speak together. It’s not just a verse from the Rigveda — it’s how Jatin and the entire eChai community truly operate. We don’t just network, we grow together. Forever grateful to be a part of the eChai Effect.
Jaydip Parikh
Chief Everything Officer at Tej SolPro
“You don’t plan to build a company via eChai. You just keep showing up … and one day, you realize you did.” I’ve known Jatin since 2012, when I was still deciding what kind of second innings I wanted to play as an entrepreneur. Over the years, through events, chai breaks, intros, and seemingly small conversations, eChai helped shape not just Upsquare but also refined the lens through which we see collaboration. At Upsquare, we’ve hired talent, met partners, discovered co-investors, and built lifelong friendships. One of our joint ventures exists today only because a casual eChai memory sparked a deeper trust. Now, as we build House of Starts — our venture builder — eChai continues to fuel our mission: co-creating a shared future. eChai isn’t just a startup network. It’s a trust network. And for business builders like me, that makes all the difference."
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Founder @ Upsquare & House of Starts • Angel Investor + LP
"eChai is playing biggest role in my personal and professional life together. Its a community where i meet like minded people to share idea and learn from their idea. Even while playing cricket i learn something and i implement something new from that learning. Its my entry point for building network in different countries where my base is not established yet. Personally my only fun activity day in a week is eChai cricket and social."
yash shah
Chairman, ES Group of Companies
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