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Similing Team

We would like to thank our clients for taking time in giving us their feedback. The trust given to us and their appreciation towards our finished work inspire us to work harder and strive more for excellence every single time. Please feel free to browse this page to give you an idea of what we're all about.


Dr. Yuan-Lung Hung, DDS
San Gabriel, CA

Tony Tejada of AT TECH SYSTEMS is very knowledgeable in his field, from design to finish very professional and also very good follow up service after job completion. I highly recommend his professional service to you.

Dr. Maria Elena Acal, DDS
Corona, CA

I was so impressed on how Tony Tejada of AT TECH SYSTEMS did his work. Reliable, fast and efficient are just few of the many qualities that he has. Thanks Tony and great job!

Dr. James Lai, DDS
Corona, CA

Tony of AT TECH SYSTEMS sets up the phone and computer wiring for our new office. We find Tony to be reliable, approachable and knowledgeable. He is also very helpful and is always available to answer our questions.

Person Talking on the Phone

Dr. Wally Hui, DDS
Rosemead, CA

Creative & Realiable networking team we ever had! Promising Support ever seen! Whatever you need - AT TECH SYSTEMS is here!!

Person in book store

Dr. Farhad Foroutan, DDS
Anaheim Hills, CA

Tony is a knowledgeable and competent individual. He has been an IT for a long time. He is professional and polite. I would recommend him to anyone who is looking for a reliable service. I have been very happy with his networking service at my office.

Smiling Person Typing On Laptop

Dr. Reza Bolourian, MD, DDS
Rancho Santa Margarita, CA

I am very satisfied with the work Tony did for me. Any questions and issues I have had, Tony either promptly came to my office and fix it or walked me through the problem over the phone. I highly recommend him. Thank you Tony.

Confident Businessman

Dr. James Pan, DDS
Rowland Heights, CA

I started my Rowland Heights office in 2011, I choose AT TECH SYSTEMS because their reasonable quote and use of high quality materials, the IT works include computer networking, phone systems, and TV antenna, everything has been completed on time and professionally within reasonable budget, if my brother would set up a new office, I would recommend AT TECH SYSTEMS for the IT works for sure.

Senior Businesswoman

Dr. Maria Jeturian, DDS
Corona, CA

Tony installed my phone and sound system. What I like about him is the extra service he did for me.  I experienced some problems with the sound system and he did what he needed to do at a very reasonable time. My phone system control broke for some reason and he was there the very next day to fix it. I've worked with other IT and computer guys who are often times hard to reach after the work is done. Tony has always been helpful when  I have any questions. I've already recommended a friend to him. 

Young Businesswoman

Dr. Alice Chalian, DDS
Burbank, CA

I am delighted to provide the highest testimonial for the work of AT TECH SYSTEMS in my dental office. Tony has the best customer service of any professional I have worked with.  The work is of the highest caliber, and he went above and beyond the call of duty with his service and troubleshooting.  He did absolutely everything in order to get our computerized digital x-ray system running perfectly. Also, the multi-media applications are great for the patients. With Tony's experience and expertise, I would recommend AT TECH SYSTEMS very highly. 


I was in the process on upgrading the computer systems for my Cosmetic Dental practice in Orange, California and was referred to Tony of AT TECH SYSTEMS by OC-1 Dental. It was the smartest decision I ever made! Tony met with me right away and gave a cost estimate far below industry standard and scheduled installation two weeks after to allow for the hardware to arrive. On the installation day, they arrived on time, worked efficiently, finished on time and did a fantastic job. All systems are working as promised and whenever you have a question for Tony, he answers his phone. You just don’t find this type of customer service in the business world today, but you will with AT TECH SYSTEMS. They are always available when you need them, do quality work and have unbeatable pricing. I couldn’t have made a better choice for my business IT needs.

Dr. Christopher Fotinos, DDS | Orange, CA

After some research , I decided to hire Tony to install my computers and data for my new Dental Office. From the start, he impressed me with his efficient, professional manner which not only inspired confidence but generated the results I was looking for. I am a detail oriented person but the details of the job could be overwhelming and intimidating. Tony was not only patient but took the time and explained everything in ways I could understand and process. He is very knowledgeable and helpful. So much so that I also hired him to install my telephone, security camera and audio service. I appreciate his responsiveness, prioritizing issues that arise and dealing with them quickly and efficiently, as well as his follow-up and preventative maintenance. He has a real commitment to providing excellent technical services and incredibly great customer service.

Dr. Mayvic Conte, DDS | Valencia, CA

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