HomeCompaniesRebulk
Rebulk

AI-native software for managing rail and bulk operations.

Rebulk builds AI-native software for rail, transload, and bulk operations. We help teams manage railcars and trucks, transloading, maintenance, yard switching, railcar tracking, bulk inventory, documents, customer reporting, and billing. Much of this work still runs on spreadsheets, paper tickets, phone calls, and disconnected legacy systems. That means teams spend too much time entering the same information twice, tracking down paperwork, figuring out where railcars and inventory are, and putting together reports by hand. Rebulk brings that work into modern software built around how each business actually operates. We’ve lived this problem, and we know how to build for it. Warren previously led product at a Series A supply chain software startup, where he worked closely with companies moving and managing bulk commodities. Cole was engineer #3 at Tropic, helping scale it from seed to Series B, and later led engineering at an AI startup. Rebulk runs operations at Venezia Transport, Usher Transport, Cicada Logistics, McDonald Farms, and TransloadX across transloading, rail maintenance, switching, railcar tracking, and bulk inventory.
Active Founders
Warren Wijaya Wang
Warren Wijaya Wang
Founder/CEO
Co-Founder and CEO of Rebulk. Previously led product at Milk Moovement, a Series A ag supply chain startup powering the transport of 45% of California’s dairy and 20% nationwide. Before that, he was an Investor at Dynamo Ventures, backing early-stage industrial startups. He also worked in Strategy & Operations at Chick-fil-A Corporate, where he launched autonomous ground robot and drone delivery programs.
Cole Robertson
Cole Robertson
Founder/CTO
Co-Founder and CTO of Rebulk. Previously Head of Engineering at Chipp, an AI startup, and engineer #3 at Tropic, where he helped scale the company from seed to Series B. Earlier experience includes developing aviation products at Garmin. Also built a SaaS consulting business focused on MVP development, generating $300K in just over a year.
Company Launches
Rebulk - Accurately measure and monitor bulk inventory
See original launch post

👋 Hey all! We’re Warren and Cole -- co-founders of Rebulk.

TL;DR

Bulk inventory is hard to track. Most companies still rely on rough estimates or expensive surveys that often miss the mark. We built Rebulk to fix that. Our drones and cameras scan your site and create a precise 3D reconstruction, so you always know exactly how much material is on the ground. We’ve got real-world experience and are already working with a major ag distributor. Know someone in ag, mining, or construction who deals with bulk materials? Send them our way: founders@rebulk.com

Problem

Bulk inventory tracking is broken. Companies either rely on guesstimates or pay for expensive manual surveys which are still off by 20 to 30 percent. Without accurate numbers, it’s hard to plan logistics, like how many truckloads are needed. And it creates accounting issues by misreporting inventory value, hurting financial planning and leading to missed opportunities.

Solution

Rebulk figures out what your inventory is, turns it into a 3D reconstruction, and tells you exactly how much you have, in both volume and weight. If your piles are smaller and indoors, like in a shed, we’ll use a fixed camera. If they’re bigger and outside, we’ll fly a drone to map them. And we don’t just stop at giving you the numbers. We plug into your system so the data helps you make real decisions, not just sit in a spreadsheet.

The Team

We’ve lived this problem, and we know how to solve it. Warren saw it firsthand as a Product Manager at Milk Moovement, a Series A AgTech startup, working closely with bulk feed suppliers and managers to plan logistics. He also launched drone delivery programs at Chick-fil-A.

Cole was Head of Engineering at an AI startup and engineer #3 at Tropic, where he helped scale the company from seed to Series B. He started his career building aviation products at Garmin. That mix of hands-on technical work and leading high-performing teams is exactly what we need to build reliable tools that work in the real world.

uploaded image

Traction

We’re already working with one of the largest agricultural feed distributors to roll out our solution.

Ask

If you know anyone in agriculture, mining, or construction who works with bulk materials, let us know! Even if it’s something we haven’t mentioned, or if you’re not sure counts as bulk inventory, we’d still love to learn more. We’re always curious and often surprised by the types of bulk inventory that don’t live in traditional boxes and barcodes.

Contact us at: founders@rebulk.com

uploaded image

YC Summer 2025 Demo Day Video
Rebulk
Founded:2025
Batch:Summer 2025
Team Size:3
Status:
Active
Location:Olathe, KS
Primary Partner:Jared Friedman