Over 200 jobs have been announced by a Galway online retail business and three Dublin-based companies.
Marsh & McLennan, a multinational professional services firm, are to create 100 highly skilled technology jobs.
The company today opened an Innovation Centre in Dublin, which will act as a data and analytics development platform for a number of its businesses.
Marsh and McLennan already employs 600 people in Ireland and has been in operation here since 1971.
The new centre will be the first ever to be set up by the company anywhere in the world.
The company pointed to the skilled and global workforce and the culture of advancing technology and innovation as being the reasons for its decision to invest further here.
Separately, Shopify which co-ordinates online retail business, says it will create 50 jobs in Galway.
The company says the positions will be filled by people who can work from home.
It is inviting applications through its website and will hold interviews in the city next month.
The company is offering a range of roles in Galway, in customer and business support positions.
Shopify says it helps small and medium sized businesses to have an online presence.
Based in Canada, it employs 600 people around the world.
Meanwhile, Irish games company Digit said it will add up to 40 new jobs at its Dublin studio after securing a significant investment from the US firm Scopely.
The two companies did not give a specific figure for the investment but described it as "multi-million euro".
Digit already employs 20 people in Dublin where it developed and launched its first game "Kings of the Realm" last year.
While 15 new jobs are to be created at the technology company NewsWhip over the next nine months.
The firm develops technology that allows media companies and brands to spot viral stories and events before they take off.
It follows the raising of over $1.6 million from investors including The Associated Press, Tribal.vc, AIB Seed Capital Fund and a number of US based seed funds.
The money will enable the business to expand its business development office in New York and Dublin based product R&D team.
The 15 new positions will bring to 30 the number employed by the company.
The new roles will be in software development, machine learning, design and customer success.
NewsWhip's technology is used by a range of media firms, including BuzzFeed, Bloomberg, The Daily Mail, the BBC and the Guardian.