ESW, the Dublin based ecommerce business formerly known as eShopWorld, has bought Los Angeles based company Scalefast.
Financial details were not disclosed by either side, but it is understood that the deal could be worth in excess of $300m.
Privately owned and VC backed, Scalefast specialises in providing global ecommerce-as-a-service solutions to brands.
The company employs over 350 staff and operates in the US, Spain, France, Switzerland, and Japan.
Founders, chief executive Nicolas Stehle, chief technology officer Frédéric Bocquet, and chief marketing officer Olivier Schott, will join the ESW senior leadership team.
"ESW's acquisition of Scalefast demonstrates our commitment and ambition to accelerate growth for our customers by empowering them to be at the forefront of rapidly evolving consumer requirements around the world," said Tommy Kelly, Founder & CEO, ESW.
"Scalefast’s technology offering is highly complementary and will enable ESW to unleash new capabilities and deliver even faster direct-to-consumer ecommerce growth for new and existing clients."
Scalefast specialises in building ecommerce stores quickly and uses data and behavioural analytics for a range of innovative features and capabilities.
"Scalefast’s services are highly synergistic with ESW’s from a revenue generation perspective," said Nicolas Stehle.
"We are excited by this opportunity to join in a bold vision for the future of DTC ecommerce. Scalefast and ESW’s blended knowledge, expertise, and technology will provide distinct competitive advantages as a fully integrated technology-driven commerce service provider."
The deal which is expected to close by the middle of the year, will bring the combined workforce to 1,000.
ESW already has over 650 employees and offices in the US, UK, France, Italy, Hong Kong and Singapore.
It is owned by Asendia, a joint venture between France's La Poste Group and Swiss Post.
Asendia first bought a 40% stake in the company in 2013, increasing it to just over 50% four years later and bought the balance just over a year ago.