meet our team

Looking for a reliable partner to keep your organization running smoothly?


Jirka Ambroz

Jirka perfected his technical skills in home and business computing in his native Czech Republic before moving to the United States in 1998. With expertise in both PC and Apple systems, he spent his early years in California refining his abilities.
In 2002, Jirka established his own company, then known as Computer Czech, LLC., in West Hollywood, offering comprehensive home and business computer systems repair and services to the local community. Through his dedication to staying up-to-date with the rapidly evolving field of technology, Jirka has become an esteemed expert in his field, garnering a loyal customer base throughout Los Angeles and the surrounding areas.
As part of his commitment to providing top-notch service, Abacus IT now offers managed services and cyber security solutions, providing hardware, software, and supplies to businesses of all sizes. With a skilled staff and expanded bi-coastal operations, Abacus IT is able to provide reliable service seven days a week.

As a dedicated professional, Jirka remains committed to his responsibilities at Abacus IT, while continuing to prioritize the technology needs of their clients.


Keith Shaffer

As Abacus IT’s Chief Information Officer, Keith is responsible for ensuring business processes run efficiently to promote the productivity of employees and the business as a whole. For over 17 years, Keith Shaffer has worked extensively in the information technology field, providing clients with innovation, honest interactions, and reliability. As Partner of a successful Managed Service Provider in New York City, he fulfilled such roles as vCIO, Senior IT Manager, Network Architect, and Project Manager, amongst others. During his tenure of 8 years as a partner, he helped organize a local charity with two colleagues. He was one of eleven fundraising candidates to raise a combined total of $850,000 for the Leukemia and Lymphoma Society. Keith’s experience in leadership, both personally and professionally, has been enforced by the methods and concepts taught to him from the EOS management model that promotes a healthy team environment with a focus on achieving all goals.

Ken Blakeley

A Senior Executive, and Advisor with more than 40 years of success across the financial services, information services and technology, oil and gas, and construction industries. His broad areas of expertise include forecasting and performance management, global operations, strategic planning, budgeting, profit planning and operational analysis, risk management, contract negotiations, acquisition due diligence and integration, joint ventures, mergers & acquisitions, and Employee Stock Ownership Plans. Ken held key leadership positions as the Chief Financial Officer of MATT Construction, CFO of Water and Infrastructure Division of Parsons Corporation, CFO of Oberthur Card Systems and the Manager Corporate Financial Planning for ARCO. Ken earned his MBA and BS from the University of Southern California. Ken previously was a licensed California CPA with the firm of PricewaterhouseCoopers.

Garrett Hovater

Garrett started his technical career in the field running electrical and low voltage wires in residential and business environments. Over the next 3 years he honed is knowledge and skills and became lead programmer for home automation and network troubleshooting. While Abacus frequently calls on Garrett’s expertise in cabling, we mostly rely on his hardware and software troubleshooting for our clients remotely and through his friendly onsite visits. When his face is not in front of a computer screen, Garrett enjoys exploring, travelling and enjoying good meal, preferably while simultaneously engaging in a good baseball game.

Casey Fox

Casey Fox

Casey an office administrator and dispatcher at Abacus IT. He has over 10 year of experience office administration and management, with specialization in creating and implementing office best practices, and customer service. Outside of work, Casey enjoys repairing and modifying retro electronics, and discovering and preserving digital media. He’s a transplant to Los Angeles, originally from Orange County.

Felipe Ocampo

Felipe’s experience in troubleshooting networks and installing hardware helps Abacus handle busy Tier I service requests as well as manage critical monitoring boards to ensure smooth-running systems for our clients. In his free time, he enjoys learning about new technology and spending time with his family.


David Chang

Nearly 10 years serving IT services and various MSP businesses, David has deep relationships with both his clients and his understanding of different networking environments. He continually demonstrates effort within his team and ongoing projects without an end. In his free time, David is actively sparring in boxing classes, working out and playing sports with colleagues/close friends. He can also be seen joining obstacles courses in both New York and New Jersey. David rarely strays away from competitions and accepts challenges in all manners.

John Anderson

John has been providing consulting and managed services supporting businesses technology needs in the: media and entertainment, energy, finance, legal, design and non-profit sectors for over 20 years. He is constantly looking for the most efficient, effective and elegant solution to every problem he faces. In his spare moments, John pursues creative endeavors, record shopping and training lions.

Jonathan Adjahoe

As a DC native, Jonathan has been working with large scale computer systems since 2006. Jonathan excels with great customer service and is able to make sure problems get resolved. He has a lot of experience with Mac, Windows and mobile platforms. Jonathan is into cars, photography and music.

Raffi Avakian

Raffi is a Los Angeles native who brings with him a wealth of knowledge having over fifteen years of Operations Management experience. He is greatly familiar with Statistics and Procurement having over five years of experience in both. For the past year, Raffi has developed a passion for Bookkeeping and Tax Preparation. He will provide the highest standard of professional service with the highest level of efficiency and accuracy. In his spare time, he enjoys cooking, fishing and listening to 1950’s music. Most of all, he loves spending time with his family.

Earvin Santiago


Genaro Valles Ramirez

Genaro Valles-Ramirez is a Junior Engineer/Help Desk at Abacus IT. He has a reputation of providing quality customer service, helping with issues related to Emails, VoIP , and any Tier 1 related questions. He also enjoys addressing onsite request and properly installing any hardware or setting up software to work as intended. Some of his hobbies are hanging out with his friend’s and family. He also likes to work on cars, workout, and eat healthy foods.


Darron Bynum

Sunil Sadanand

Antonio Aguirre

Professional network and systems engineer with over 15 years of experience designing and managing network, security and server infrastructure. Mentored engineers, resolved escalated issues and implemented solutions to complex business needs. In his free time, he enjoys outdoor cooking and grilling.

Hildelberto Castaneda

I am a computer enthusiast and a technician with over 10 years of experience in computer, network systems and applications. I enjoy spending my time with my family and learning new skills for the day to day challenges.

Innocent Maluka

Christopher McClenon