Find top IT service companies in California through DesignRush. Our platform connects you with California IT support companies trusted by brands like McDonald's and Coca-Cola. With over 1M monthly visitors and Fortune 500 companies using our rankings, you can be confident in the quality of every agency listed. Compare providers by industry expertise, client type, budget, reviews, team size, and portfolio.

Top IT Services Companies in California

Compare the leading IT services agencies in California, handpicked for their verified reviews, standout portfolios, and proven expertise, so you can confidently choose the right partner to scale your business.

Agency Name Why Hire Them Client Rating Hourly Rate Top Client or Case Study Top Industries
Goji Labs Trusted by global brands for UX and digital products. 5.0 ⭐ $149 Redesigned Elf on the Shelf website for immersive experience. Nonprofit, Healthcare, Fintech
Closeloop Technologies Award-winning, innovative tech solutions for complex needs. 4.9 ⭐ $25 Resolved database outage for Brex in two hours. Fintech, Healthcare, eCommerce
Mercury Development Over 2,500 projects delivered for top global brands. 4.9 ⭐ $50 Developed mobile apps for Burger King and Fitbit. Wellness & Fitness, Healthcare, Retail
Suffescom Solutions Inc Experts in mobile apps with global industry recognition. 5.0 ⭐ — Built ridesharing app for GoCar Malaysia. eCommerce, Healthcare, Fintech
AppMakers USA MIT, Stanford, UCLA engineers deliver on time and budget. 5.0 ⭐ — Developed mobile app for CVS Pharmacy. Retail, Education, Sports
Azumo Nearshore experts trusted by Meta, Zynga, United Health. 4.9 ⭐ $55 Developed chatbot app for Facebook events. AI, Fintech, Health Care
Koderspedia Custom mobile and web solutions with rapid delivery. 4.9 ⭐ — Web app for Gameloft Montreal exceeded expectations. eCommerce, Gaming, Real Estate
Aristek Systems AI and EdTech specialists with 22+ years experience. 4.8 ⭐ $50 Award-winning LMS for K-12 education market. Education, Health Care, Logistics
SDLC Corp Full-cycle digital solutions for startups to enterprises. 4.9 ⭐ $50 IoT supply chain project improved delivery for Freight Right. Logistics, eCommerce, Gaming
Trango Tech Holistic software and mobile solutions for global growth. 4.7 ⭐ — Built wellness app for Simple Habit company. Wellness & Fitness, eCommerce, Real Estate

We Have Researched the Best California IT Support Companies For You

477 Companies - Rankings updated: August 20, 2026

Every agency featured on DesignRush is vetted for expertise and client satisfaction to support your decision-making. Some listings may be sponsored.

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  • Accenture

    World Famous IT Services for Businesses

    World Famous IT Services for Businesses

    With Accenture, you'll experience IT Services powered by our insight-driven tactics that deliver measurable success in digital transformation, cloud adoption, and cybersecurity. Backed by 500,000+ experts and the largest global tech network, we drive innovation and value across 40+ industries worldwide...

    Top Services:

    • Software Development
    • Cybersecurity
    • IT Services
    • IoT
    • Big Data Analytics
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    Portfolios Count
    4 Projects Listed
    View Profile
    4.1 4.1 (2)
    4.9 4.9 (18)

  • Exadel

    Advance Your Business Through Technology.

    Advance Your Business Through Technology.

    Exadel is a leading global consulting and engineering company that delivers technology transformation to help customers become digital leaders in their industries...

    Top Services:

    • Software Development
    • AI Development
    • IT Services
    • Big Data Analytics
    • Business Consulting
    • Show more
    Location
    Walnut Creek, California
    Number of Employees
    1000 & Up
    Portfolios Count
    6 Projects Listed
    View Profile
    4.2 4.2 (5)

  • Hi-Tech BPO

    Your Partner in Process Excellence

    Your Partner in Process Excellence

    Since 1992, Hitech BPO is an award winning ISO certified company, delivering business process outsourcing solutions, recognized by Dun & Bradstreet as a top BPO Company for four years in a row...

    Top Services:

    • BPO
    • Big Data Analytics
    • IT Services
    • AI Development
    • Show more
    Location
    Santa Clara, California
    Number of Employees
    1000 & Up
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    2 Projects Listed
    View Profile

  • Protiviti

    Global Business Consulting Excellence

    Global Business Consulting Excellence

    Protiviti is a global consulting firm that offers deep expertise, objective insights, and tailored solutions to empower leaders in tackling future challenges. With a comprehensive range of services spanning finance, technology, operations, data, analytics, governance, risk, and internal audit, we serve...

    Top Services:

    • Business Consulting
    • IT Compliance Solution
    • Big Data Analytics
    • IT Services
    • Cybersecurity
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    Portfolios Count
    5 Projects Listed
    View Profile
    5.0 5.0 (1)

  • Nisum

    AI-Powered. Impact-Driven. Human-Centered.

    AI-Powered. Impact-Driven. Human-Centered.

    Our motto is "Building Success Together®," which reflects our commitment to investing in our clients and partners to propel them towards achieving their business goals. As a result, Nisum has grown due to the trust we have built and the success we bring to our network. We thank our clients, partners, and...

    Top Services:

    • Managed Services
    • IT Services
    • Blockchain
    Location
    Brea, California
    Number of Employees
    1000 & Up
    View Profile
    3.4 3.4 (11)

  • Indium

    Make Technology Work

    Make Technology Work

    Indium is an AI-driven digital engineering company that helps enterprises build, scale, and innovate with cutting-edge technology. We specialize in custom solutions, ensuring every engagement is tailored to business needs with a relentless customer-first approach...

    Top Services:

    • Big Data Analytics
    • AI Development
    • Mobile App Development
    • Cloud Consulting
    • IT Services
    • Show more
    Location
    Cupertino, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $50/hr
    View Profile
    5.0 5.0 (1)

  • Withum

    Business & Technology Solutions

    Business & Technology Solutions

    Withum can be the new business advisor relationship you need to inspire innovation for your growth and success. Experience a fresh perspective on embracing what you’ve learned and refocusing your business strategy to thrive in an evolving, complex business environment. Whether you’re looking to strengthen...

    Top Services:

    • Accounting
    • HR Outsourcing
    • Cybersecurity
    • IT Services
    • Show more
    Location
    San Francisco, California
    Number of Employees
    1000 & Up
    View Profile
    5.0 5.0 (8)

  • Trianz

    Simplifying Your Digital Evolution with Big Data Excellence.

    Simplifying Your Digital Evolution with Big Data Excellence.

    Trianz enables digital transformations through strategic excellence, powered by knowledge and innovation in Big Data. With a portfolio reflecting 'Digital Evolution Simplified' and over 2,500 successful global partnerships, we lead in leveraging Infrastructure, Cloud, Analytics, Digital, and Security to...

    Top Services:

    • Big Data Analytics
    • CRM Consulting
    • Cloud Consulting
    • IT Services
    • Cybersecurity
    • Show more
    Location
    Santa Clara, California
    Number of Employees
    1000 & Up
    Portfolios Count
    5 Projects Listed
    View Profile
    4.0 4.0 (4)

  • EY

    Building A Better Working World

    Building A Better Working World

    EY offers Accounting, Business Consulting, and IT Services with a mission to build a better working world. It provides insights and quality services that instill trust in global capital markets and economies. EY focuses on developing exceptional leaders who deliver on their commitments to all stakeholders...

    Top Services:

    • Business Consulting
    • HR Outsourcing
    • Accounting
    • Cybersecurity
    • IT Services
    • Show more
    Location
    Sacramento, California
    Number of Employees
    1000 & Up
    View Profile

  • IBA Group

    Co-Creating a SMART Future

    Co-Creating a SMART Future

    Engineering customer-centric solutions through trusted relationships & technology that bridge the legacy of the past with the landscape of the future...

    Top Services:

    • Software Development
    • Mobile App Development
    • IoT
    • Software Testing
    • AI Development
    • Show more
    Location
    San Jose, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    8 Projects Listed
    View Profile
    4.5 4.5 (2)

  • STRATACACHE

    Pushing the Boundaries of Digital Signage at Scale

    Pushing the Boundaries of Digital Signage at Scale

    STRATACACHE is accelerating the shift of digital retail transformation by having a full scope of technology under one roof. Our retail solutions allow us to be partners in creating an in-store evolution, fitting into your existing ecosystem by connecting different technologies to truly drive a frictionless...

    Top Services:

    • IT Services
    • Managed Services
    • Video Production
    • Software Development
    • Web Design
    • Show more
    Location
    San Francisco, California
    Number of Employees
    1000 & Up
    View Profile
    4.9 4.9 (9)

  • Grant Thornton

    IT, Business, BPO, Audit, Tax and Advisory are just the beginning.

    IT, Business, BPO, Audit, Tax and Advisory are just the beginning.

    Grant Thornton LLP (US) is an IT, project management, audit, tax, AgTech, and BPO company headquartered in Chicago, Illinois with over 50 U.S. offices and access to a global network or member firms in over 135 countries. We offer a broad range of services in strategy and consulting, operations, technology and...

    Top Services:

    • Accounting
    • Business Consulting
    • Market Research
    • HR Outsourcing
    • Software Development
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    2 Projects Listed
    View Profile
    4.5 4.5 (13)

  • Crowe

    Empowering Your Accounting Decisions.

    Empowering Your Accounting Decisions.

    Crowe LLP is a global accounting firm offering audit, tax, advisory, and consulting services. With deep industry expertise, we empower businesses to make informed decisions for lasting value. Recognized as a top workplace, we leverage our partnership with Crowe Global to provide comprehensive solutions...

    Top Services:

    • Accounting
    • HR Outsourcing
    • Business Consulting
    • Market Research
    • BPO
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    View Profile
    2.6 2.6 (5)

  • PwC

    Building trust in society and solving important problems.

    Building trust in society and solving important problems.

    We’re a network of firms in 155 countries with over 284,000 people who are committed to delivering quality in BPO, project management, assurance, advisory, IT, and tax services...

    Top Services:

    • Market Research
    • BPO
    • HR Outsourcing
    • Accounting
    • Business Consulting
    • Show more
    Location
    Orange County, California
    Number of Employees
    1000 & Up
    View Profile
    4.6 4.6 (74)

  • K2 Partnering Solutions

    Best Consulting Solution For Your Business

    Best Consulting Solution For Your Business

    K2 Partnering Solutions is the global leader in technology staffing with unparalleled expertise, market knowledge and international presence in ERP (SAP, Oracle), Enterprise Cloud (Salesforce), Analytics/Big Data, Enterprise Mobility and Social/Digital technologies...

    Top Services:

    • IT Services
    • Web Design
    • Web Development
    • Digital Marketing
    • Mobile App Development
    • Show more
    Location
    San Francisco, California
    Number of Employees
    1000 & Up
    View Profile

  • Deloitte

    Collaborating for Lasting Impact in Business Consulting

    Collaborating for Lasting Impact in Business Consulting

    Join us at Deloitte, where we believe that our collective influence is the cornerstone of our value. With a rich legacy spanning over 175 years and a global network encompassing 150 countries, we empower remarkable achievements, solve complex problems, and drive meaningful progress for clients, professionals...

    Top Services:

    • Business Consulting
    • Accounting
    • HR Outsourcing
    • Big Data Analytics
    • CRM Consulting
    • Show more
    Location
    Sacramento, California
    Number of Employees
    1000 & Up
    Portfolios Count
    6 Projects Listed
    View Profile
    3.4 3.4 (83)

  • KPMG

    Together, we achieve more.

    Together, we achieve more.

    Offering project management, business, and IT services. At KPMG LLP, their purpose is to turn knowledge into value for the benefit of their clients, people, and the capital markets...

    Top Services:

    • Business Consulting
    • Market Research
    • Accounting
    • HR Outsourcing
    • IT Services
    • Show more
    Location
    Oxnard, California
    Number of Employees
    1000 & Up
    View Profile
    4.3 4.3 (56)

  • Baker Tilly

    Now, for tomorrow.

    Now, for tomorrow.

    Offering AgTech, Business, and IT Services. Baker Tilly Canada Cooperative is a member of the global network of Baker Tilly International Limited, the members of which are separate and independent legal entities. Baker Tilly Canada refers to the association of member firms of Baker Tilly Canada Cooperative...

    Top Services:

    • HR Outsourcing
    • Accounting
    • Business Consulting
    • Market Research
    • Cybersecurity
    • Show more
    Location
    Orange County, California
    Number of Employees
    1000 & Up
    View Profile
    4.6 4.6 (19)

  • Avenu Insights & Analytics

    Avenu serves over 3,000 State & Local government clients across the country through a wide variety of solutions and services...

    Top Services:

    • Cybersecurity
    • IT Services
    Location
    Westlake Village, California
    Number of Employees
    1000 & Up
    View Profile

  • Boldr

    Outsourcing Done Ethically

    Outsourcing Done Ethically

    BoldR Impact is a premier sustainability PEO consulting firm committed to driving positive change for businesses and the environment. With an unwavering commitment to excellence, we offer a comprehensive suite of services tailored to diverse industries...

    Top Services:

    • BPO
    • Call Centers
    • IT Services
    Location
    Santa Monica, California
    Number of Employees
    1000 & Up
    Portfolios Count
    2 Projects Listed
    View Profile
    5.0 5.0 (1)

  • Toptal

    Leverage World-class Talent

    Leverage World-class Talent

    Toptal is a highly respected network of elite talent available when needed. Our team of problem-solvers is committed to integrity, and leading companies turn to us for critical projects. We equip organizations with the tools to compete and succeed in a rapidly-evolving business world, boasting exceptional...

    Top Services:

    • Mobile App Development
    • VR/AR
    • Blockchain
    • Software Development
    • AI Development
    • Show more
    Location
    San Francisco, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $149/hr
    Minimal Budget
    $50,000 & Up
    View Profile

  • intive

    Creating digital reality!

    Creating digital reality!

    Headquartered in Munich, Germany, intive is a leading global digital services company that collaborates with industry leaders to accelerate digital transformation for future products and services...

    Top Services:

    • IoT
    • Mobile App Development
    • Software Development
    • Web Development
    • UI/UX Design
    • Show more
    Location
    Santa Clara, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $99/hr
    View Profile
    4.7 4.7 (16)

  • Persistent

    See Beyond, Rise Above.

    See Beyond, Rise Above.

    Persistent Systems, a renowned global leader in software product development and technology services. Delve into our innovative offerings to stay ahead in the ever-evolving landscape of technology...

    Top Services:

    • AI Development
    • Software Development
    • Web Development
    • Mobile App Development
    • Blockchain
    • Show more
    Location
    Santa Clara, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $50,000 & Up
    View Profile
    4.6 4.6 (730)

  • Jade Global

    IT Consulting Space - Where Your Vision Drives Us To Deliver Business Impact.

    IT Consulting Space - Where Your Vision Drives Us To Deliver Business Impact.

    With 2000+ professionals worldwide, 2600+ technology projects, and 350+ cloud-certified professionals, Jade Global is your ideal IT Services Partner. Jade Global is a member of Oracle, Salesforce, Boomi, ServiceNow, NetSuite, SAP, AWS, and Snowflake providing comprehensive implementation, integration, and...

    Top Services:

    • CRM Consulting
    • ERP Consulting
    • ECM Consulting
    • Managed Services
    • IT Services
    • Show more
    Location
    San Jose, California
    Number of Employees
    1000 & Up
    Portfolios Count
    1 Project Listed
    View Profile
    4.3 4.3 (11)

  • Freshworks

    Transforming Businesses With IT Services

    Transforming Businesses With IT Services

    Freshworks delivers innovative IT services that help businesses streamline operations, enhance customer experiences, and drive growth. With a suite of cloud-based solutions, Freshworks empowers organizations to optimize customer support, sales, and marketing. The agency's user-friendly platforms ensure...

    Top Services:

    • IT Services
    • Managed Services
    Location
    San Mateo, California
    Number of Employees
    1000 & Up
    View Profile
    4.3 4.3 (24)

  • Concentrix

    Securing Tomorrow with AI-Driven Cyber Defense

    Securing Tomorrow with AI-Driven Cyber Defense

    Concentrix delivers enterprise-grade AI cybersecurity solutions through managed security services, helping organizations detect threats, mitigate risk, and ensure operational resilience in real time...

    Top Services:

    • AI Development
    • IT Services
    Location
    Newark, California
    Number of Employees
    1000 & Up
    View Profile
    2.8 2.8 (13)

  • eNoah iSolutions Inc

    Bringing Business Services To Cloud Precision

    Bringing Business Services To Cloud Precision

    eNoah iSolution is a global IT and BPO services firm with over 18 years in operation. Certified in ISO27001 (and HIPAA compliant), the company employs more than 1,800 professionals across six countries. It supports clients in over 20 verticals including several Fortune500 companies offering secure business...

    Top Services:

    • Mobile App Development
    • IT Services
    • BPO
    Location
    Westlake Village, California
    Number of Employees
    1000 & Up
    View Profile

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Rated 4.8 on Google and 4.7 on Trustpilot, DesignRush Agency Directory is a reliable resource for finding IT services companies in California. We owe this to our executive selection team, which follows a strict screening process when featuring agencies on the platform, assessing key performance indicators, like portfolio, client reviews, and industry reputation.

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Frequently Asked Questions

What services do IT services companies in California provide?

IT services companies in California provide technology solutions that help businesses run efficiently, stay secure, and scale operations. Their services typically include: 

How do IT services companies in California help businesses improve efficiency and security?

IT services companies in California improve efficiency and security by automating routine tasks, maintaining cloud infrastructure, and ensuring fast, reliable access to business tools. For security, they set up firewalls, encryption, and multi-factor authentication to block unauthorized access.  

They also monitor networks 24/7, detect vulnerabilities early, and provide regular updates and backups to prevent downtime or data loss. This allows businesses to operate smoothly and focus on growth while staying protected from cyber risks. 

How much do IT services cost in California?

IT services in California typically cost $80 to $200 per user per month, depending on service scope and company size.  

  • Basic packages cover help desk support, monitoring, and maintenance 
  • Mid-range plans include security management, cloud services, and data backups 
  • Higher-end packages add advanced cybersecurity, compliance support, and strategic IT consulting 

Project-based work, like migrations or infrastructure upgrades, is usually billed separately at hourly rates. 

What certifications should California IT support companies have?

California IT support companies should hold certifications that prove their technical skill and security standards. Common and respected ones include: 

  • CompTIA A+ or Network+
  • Microsoft Certified Solutions Expert (MCSE)
  • Cisco Certified Network Associate (CCNA)
  • AWS or Google Cloud certifications
  • Certified Information Systems Security Professional (CISSP)
  • ITIL Certification

How do IT services companies in California ensure data protection and compliance with state and federal laws?

IT services companies in California ensure data protection and compliance by combining strict security measures with legal standards. They use encryption, firewalls, and access controls to secure sensitive information, along with regular backups and disaster recovery systems.  

To meet regulations like CCPA, HIPAA, and GDPR, they conduct compliance audits, maintain data processing policies, and train staff on privacy rules. They also monitor systems for breaches, keep detailed logs for accountability, and update protocols as laws or threats evolve, ensuring businesses stay secure and compliant. 

What kind of ongoing support do California IT support companies offer after implementation?

California IT support companies provide ongoing services to keep systems secure, up to date, and running smoothly after implementation. Support usually includes 24/7 monitoring, help desk assistance, and regular maintenance to prevent downtime.  

They handle software updates, security patches, and system backups, and monitor networks for performance or security issues. Many also offer user training, hardware upgrades, and scalability planning so businesses can adapt as they grow. 

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