Maheesh Jain, the chief marketing officer of customized gift e-retailer CafePress Inc., has resigned and will leave the company he co-founded at the end of the month, according to documents filed with the Securities Exchange Commission.

On Dec. 1, Jain gave notice of his resignation, effective Dec. 31, the company says. Chairman and CEO Fred E. Durham III will assume Jain’s duties starting Jan. 1, according to the SEC filing.

“Maheesh has been a key contributor to CafePress’ evolution since co-founding it in 1999 and returning to his leadership position alongside Fred Durham, co-founder and CEO, in 2014,” CafePress said Wednesday. “Since that time, we have made impressive strides right-sizing the company and we are focusing on reenergizing CafePress for a return to profitable growth. We have consolidated our footprint and streamlined our operations throughout our organization over the past two years. Maheesh is based in California and has decided to step down from his role following the closure of the California operations,” the company said.

Jain could not be reached for comment.

Sales for CafePress in the third quarter ended Sept. 30 were down 1.5% year over year, notably lower than previous declines of 9.2% in Q2 and a 23% decline in Q1. The online-only retailer, No. 249 in the Internet Retailer 2016 Top 500 Guide, in Q3 refreshed CafePress.com with improved navigation and updated its mobile site to ensure a more consistent experience across all devices. It also reported that mobile traffic grew in the high single digits year over year in the third quarter, and mobile sales grew in the low double digits.

Jain, who founded CafePress in 1999 with Durham, was responsible for marketing and business development through 2008 and worked in roles that included social media, mobile and product management through 2011, according to his LinkedIn profile. Jain returned to CafePress in 2014 alongside Durham when the previous CEO, Bob Marino, left the company.

Prior to CafePress, Jain launched “9 companies you’ve never heard of in 4 years,” his LinkedIn profile says. Jain also lists himself as the founder of 3rdRevolution, still active and formed in 2013, which “allows hobbyists and enthusiasts to organize their projects and showcase the awesome things they make,” according to his profile.