Our commitment to you
Bringing you advanced, safe, and reliable donut equipment.








Quality Manufacturing
Designed and built to last over a decade
- Quality in-house equipment manufacturing in the European Union
- Designs and processes perfected for over 20 years
- Machines tested and certified by an independent laboratory
- Highest quality German electrical components
- Rigorous post-production testing standard
- Estimated average machine uptime of 98%

Warranty & Servicing
Receive the support that you deserve
- One-year parts & labor warranty for all purchases
- Rapid remote diagnostics and support
- In-stock spares with fast shipping
- Modular design enabling easy part replacement
- Lifetime post-warranty support for all our donut equipment (while components last)
Company History and Background
STOK Engineering Ltd. was established in 2002 in Plovdiv, Bulgaria, by Stoyan Kiryakov with the goal of providing engineering solutions to local companies in the food and beverage industries. The company began in-house manufacturing in 2004 and has since maintained the highest level of quality standards in both engineering and manufacturing.
The decades of expertise of our founder and chief engineer, Mr. Kiryakov, as well as the experience of our team of engineers, have enabled STOK Engineering to create a differentiated portfolio of solutions and products. Our innovative designs provide clients with cost-efficient products and highly-customized solutions. We have also helped clients benefit from our specific industry-domain knowledge.
- We have helped clients of our donut machine product line start up successful ventures in over 50 countries around the world
- Our machines conform to the highest European safety and food-processing sanitary standards
- We provide parts and repairs at cost after warranty expiration
We source parts and machine components only from renowned suppliers such as: Schneider Electric, KEYENCE, Bosch Rexroth, and HENGSTLER.
To this day, STOK Engineering remains a family-owned and operated business. We are dedicated to delivering lasting value to our customers, ensuring safe working conditions, and sustaining the livelihoods of our employees — all while leaving a neutral footprint on our environment.

Stoyan Kiryakov
Founder & CEO of STOK Engineering
Stoyan Kiryakov (M.Sc. Eng.) is the founder and Chief Engineer of STOK Engineering. Stoyan produced the first machine in 2004 and has been perfecting its design since.
Stoyan loves his work and dedicates his spare time to rescuing and providing care to stray cats and dogs.
Renewable Energy & Energy Efficiency

Through collaboration with Bulgaria Energy Efficiency Competitive Industry Financing Facility and the European Bank for Reconstruction and Development, STOK Engineering successfully completed a project in 2014 for upgrading energy-efficient manufacturing equipment, implementing renewable energy heating sources, and improving the overall energy efficiency of the company. By implementing the measures, the company reduced its impact on the environment, directly contributing towards EU’s objectives for environmental sustainability.
Industrial Clients
