Besides, Myntra co-founder Ashutosh Lawania has quit the company to start a new venture.
Ratia, currently serving as chief people officer and head for new initiatives, will take additional charge from Lawania as head of supply chain and consumer experience, Myntra said in a statement.
The changes are effective today, it added.
Soni will head the Jabong business and will be responsible for driving it operationally through its next phase of growth.
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Previously partner at McKinsey & Company and vice president at Star India, she will focus on setting the strategic direction for Jabong and drive growth and profitability for the business in her new role, the statement said.
The company has also elevated Naresh Krishnaswamy, who has been with Myntra for five years, to the senior management team at the firm.
He will continue to be responsible for the entire sales organisation and key initiatives to drive growth of Myntra, it said.
Gunjan, Manpreet and Naresh are successful leaders with diverse experiences and have played a vital role in growing Myntra from strength to strength and with these changes, he added.
"I am confident that we are well on our way to become the first profitable e-commerce company in India," he said.
The fashion e-tailer said it has witnessed a 100 per cent year-on-year growth in the month of January with the highest-ever revenues of over Rs 850 crore and an annualised run rate of USD 1.65 billion.
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