Software developer is now one of the most common titles in the retail industry, according to LinkedIn.

Retail is shifting. More sales are moving online. E-commerce sales in the U.S. grew an estimated 16.2% in March, according to an Internet Retailer analysis of sales data released by the U.S. Department of Commerce last week. Meanwhile, total retail and food sales grew 4.5%, the Commerce Department says.

Those changes are reflected in the retail workforce, according to new research from business and employment website and service LinkedIn. LinkedIn bases its findings on its aggregate member data. Functions are classes of job roles, inferred by job title. For this analysis, LinkedIn examined companies with at least 100 employees that sell general merchandise, specialty goods or sell online as e-commerce businesses.

Engineering and IT roles have increased to 9% from 7% of all retail roles in the past four years, the company’s analysis finds. At the same time, the number of retail sales associates has fallen to 116,000 in 2017 from around 200,000 in 2013. Sales roles now represent 29% of talent in retail, down from 33% in 2013.

However, sales is still the most common retail role by a large percentage. Sales roles account for nearly 30% of the workforce in retail—that’s more than twice the size of the second-biggest function, operations (13%). Engineering and IT talent are the third-most common type of employees in retail, followed by support (8%) and marketing (6%).

LinkedIn also analyzed the skills of software developers at retail companies to find top developer skills (by volume of a company’s LinkedIn members who possessed each skill), fastest-growing skills (calculated by percentage of retail developers adding that skill in last six months) and most unique skills (calculated by comparing the percentage of retail developers with certain skills against the percentage of all software developers with those skills).

The demand for engineering and digital skills is growing quickly in retail. For example, the job title ‘software developer’ is now one of the most common titles in the retail industry, moving to No. 3 from No. 8 in the past four years. The most common and fastest-growing skills for developers in retail today include web and user experience.

“This showcases the shift from brick-and-mortar storefronts to online shopping, given the significant growth in tech roles, as retail becomes yet another industry competing for software developers and IT support,” LinkedIn writes in its findings.

The most popular skill among retail developers was Java, a common programming language that’s often used in building and maintaining e-commerce sites. JavaScript and HTML, the second- and fourth-most common skills, are also frequently used in developing websites. SQL—the third-most common skill—is used to access and edit databases, which are often used for tracking inventory and customers.

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The fastest-growing skill for developers in retail is React.js, a JavaScript library that’s used for building user interfaces online.

Many of the skills most unique to retail developers compared to all other software developers deal with challenges central to retail, including warehouse management system implementation, supply chain optimization and Oracle Retail, a retail cloud computing technology.

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