One platform that runs the TikTok Shop side of your business for you. Brands stop logging into Seller Center. Agencies scale without hiring. Creators get matched with brands worth their time.

Seller OS is an AI operating system that replaces TikTok Shop's native Seller Center. It automates shop operations, affiliate and creator management, advertising and customer support in one place, and lets brands and agencies turn any workflow into a repeating automation.

About Dimension

The team behind SellerOS for TikTok Shop.

The social commerce technology company behind SellerOS, the agentic AI operating system for TikTok Shop. We run shops ourselves, so the software is built on what actually works, not what should.

What we do

An AI operating system that
runs a TikTok Shop

An AI operating system that runs a TikTok Shop

Dimension builds SellerOS, an AI operating system that runs a TikTok Shop for brands and agencies. It takes over the manual work that lives inside TikTok’s native Seller Center: creator and affiliate outreach, listing optimization, ad management, customer support, reporting. You tell it what you need in plain English. AI agents do the work, and any workflow can become a repeating automation that runs while you don’t.

We also run shops ourselves. Dimension is an official TikTok Shop Partner, and our full-service team has managed TikTok Shop operations for more than 50 brands and agencies, built four #1 shops in their categories including the platform’s #1 overall shop, and helped drive more than $100 million in GMV across our customer base. SellerOS is that playbook, turned into software.

How Dimension started

Ali Mirzaei started Dimension after a decade on both sides of social commerce, as a creator selling to his own audience and as an operator scaling a creator marketplace. When TikTok Shop launched in the U.S. in 2023, he was one of its earliest sellers, and within six months he had built the #1 shop on the platform. Creators could move real product. A marketplace finally existed to let them. What didn’t exist was the software to run it at scale.

Dimension was founded in 2024 to do that for other brands, and to build that software. We didn’t want to build it on guesses, so we ran the shops first. Dimension launched as a full-service TikTok Shop operator: storefront operations, affiliate programs, paid advertising, customer acquisition, the whole job. The shops were the proving ground. Every workflow we ran by hand for brands like Final Boss Sour, Bones Coffee and Leilo showed us what was worth automating and what wasn’t.

Dimension operated profitably in 2024 and 2025, and SellerOS was built out of those margins before the seed round. It went into private beta in early 2026. In July 2026 we announced a $1.65 million seed round from Science Inc., UpScaleX, OpenSky, Long Run Capital, 1864 Fund and angel investors including Lawrence Hsu and Austin Sprinz. In August 2026, SellerOS opened to the public.

Ali Mirzaei

Founder and CEO

Ali grew up on Long Island, New York. At five he was diagnosed with a rare autoimmune disease that paralyzed him, and he spent years in physical and occupational therapy relearning basic motor control. Gaming became his competitive outlet, and by 13 he was ranked top 10 in the world in Halo 5.

He has been in social commerce for over a decade. At 14 he was selling merch to his own audience through his YouTube channel and scaled his first store past half a million dollars a year, entirely through organic reach with no paid ads. At 16 he designed and built a biomedical device for patients with fine motor control disorders, the same kind of challenge he had spent his childhood working through. He graduated top 10 in his class with a 4.3 GPA.

He earned a full scholarship to Virginia Commonwealth University and kept a 4.0 as a full-time student while working full-time at ProGuides, where he helped scale the marketplace from $400K to more than $4 million in marketplace revenue ahead of an eight-figure acquisition. After the exit, he launched a new personal brand and did more than 600 million views in eight months, gained over 500,000 followers, and sold more than $1 million of merch behind it. He left VCU 22 credits short of a degree when Dimension launched.

Since then he has built Dimension into a profitable company that has taken four brands to #1 in their categories on TikTok Shop, and raised a seed round backed by Science Inc. He spoke on the agentic commerce panel at NY Tech Week alongside Stripe’s Global Solutions Architect Lead for Agentic Commerce, and won the pitch competition that same week.

The USC Iovine and Young Academy keeps bringing him back to teach its student founders. He sat on the founder panel at the Academy’s 2025 Founders Bootcamp, a day that also featured Microsoft for Startups, Andreessen Horowitz and Techstars, has guest lectured on social commerce in Tina Sharkey’s Modern Brand and Community Playbook class, and has judged startup demos for Troy Labs. He also advises emerging social-native founders and their D2C brands, and has written for 1800DTC. He runs the company from Santa Monica, California.

Connect with Ali on LinkedIn →

Ali Mirzaei

Founder and CEO

The team

Dimension is a small team of operators, engineers and creators based in Santa Monica, California. Much of the core team has worked together for more than seven years and already built one startup to an eight-figure exit before this one. The people building SellerOS sit alongside the people running shops on it. When TikTok Shop changes, we find out the same day, because our own revenue depends on it.

The team

The team

Who we work with

Brands, agencies, and the creators who sell for them.

Brands

Selling on TikTok Shop and want to stop running it by hand

Agencies

Managing multiple shops that need one place to run all of them. SellerOS powers agencies running 100+ shops.

Creators & affiliates

Want to make 2 to 3× their TikTok Shop earnings without any extra work.

We've worked with more than 50 brands and agencies, including Final Boss Sour, Bones Coffee and Leilo. The numbers are in the case studies. Read the case studies →

Backed by

Science Inc., UpScaleX, OpenSky, Long Run Capital, 1864 Fund and angel investors including Lawrence Hsu and creator-investor Austin Sprinz. The seed round is funding engineering, product and go-to-market for SellerOS.