If you're looking for the true heart of Silicon Valley, San Jose, California, is a good choice. Tech giants such as Cisco Systems, Adobe, and eBay maintain their headquarters there, and Google has announced plans to open a massive new campus in the city. Many of the industry's leading private companies have made their mark in San Jose as well. Here are the city's top 10 private companies from the 2019 Inc. 5000 list, measured by revenue growth over the past three years.

10. GatherUp

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2019 Inc. 5000 rank No. 2,240 | Three-year growth 180% | 2018 revenue $2M

GatherUp helps businesses grow by analyzing their online reviews and other feedback from customers. Founded in 2015, the company scans and captures customer comments from more than 100 review sites, including Google, WebMD, Facebook, and TripAdvisor.

9. Align Technical Resources

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2019 Inc. 5000 rank No. 1,891 | Three-year growth 213% | 2018 revenue $3.9M

Align Technical Resources uses a data-driven process to recruit the right temp-to-hire and direct-hire talent for its clients. The staffing company has locations both in Silicon Valley and in Las Vegas.

8. Flexton

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2019 Inc. 5000 rank No. 1,707 | Three-year growth 239% | 2018 revenue $21.3M

Since launching in 2007, Flexton has offered consulting services to help companies fix problems related to software development, e-commerce services, graphics, and infrastructure. Its list of high-profile clients includes LinkedIn, Walmart, and eBay.

7. Tredence

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2019 Inc. 5000 rank No. 1,008 | Three-year growth 419% | 2018 revenue $18.8M

Tredence uses machine learning to develop analytics solutions for clients in the U.S., Canada, Europe, Australia, and Southeast Asia. This year marks the company's fourth appearance on the Inc. 5000 list. 

6. Zoom

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2019 Inc. 5000 rank No. 706 | Three-year growth 619% | 2018 revenue $151.5M

Zoom brings videoconferencing, online meetings, and group messaging into one communications platform. Founded in 2011, Zoom has become a communications staple for companies including Uber, Delta Airlines, and even Slack.

5. Azazie

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2019 Inc. 5000 rank No. 599 | Three-year growth 741% | 2018 revenue $44M

Founded in 2014, Azazie is an online bridal boutique focused on affordability and body inclusivity. The company posts designs on its site before making its garments, soliciting feedback to ensure it's creating dresses customers actually want.

4. Peaxy

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2019 Inc. 5000 rank No. 534 | Three-year growth 817% | 2018 revenue $2.9M

Peaxy was founded in 2012 to provide data solutions through subscription licensing of its data management software. This company uses data to create "digital twins"--models of products that clients can analyze to see if they can make a product more efficiently. Clients include General Electric and Apex Clean Energy. Peaxy also has offices in Italy and Sweden.

3. Edvenswa Tech

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2019 Inc. 5000 rank No. 395 | Three-year growth 1,157% | 2018 revenue $2.9M

Edvenswa's tech incubation and consulting services help startups create proofs of concept, prototypes, and product-ready systems. In 2016, the company won the SAP StartUp World competition.

2. Green Bits

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2019 Inc. 5000 rank No. 359 | Three-year growth 1,276% | 2018 revenue $5.9M

Founded in 2014, Green Bits makes software that's used by cannabis retailers in 13 states. Its product enables dispensaries to simplify their checkout processes, streamline store operations, and ensure compliance with government regulations.

1. DigitalOnUS

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2019 Inc. 5000 rank No. 89 | Three-year growth 3,535% | 2018 revenue $10.4M

DigitalOnUsa software development and managed services company, has grown from 11 to 178 employees over the past three years. It lands in the No. 1 spot on Inc.'s list of San Jose's fastest-growing companies for the second year in a row.