Prior to joining Golden Age Capital, Eftychis worked at Goldman Sachs in London within the Industrials and Business Services investment banking team. During his time at Goldman Sachs, he advised on a broad range of transactions, including mergers and acquisitions, spin-offs, equity placements, and leveraged financings, working primarily with large corporate and private equity clients.

Before Goldman Sachs, Eftychis worked at Nomura in London within the Greentech, Infrastructure, and Industrials investment banking team. In this role, he was involved in numerous M&A transactions across a wide range of sectors, including telecommunications, utilities, and renewable energy.