# Companies using HashMap

201 companies in our data use HashMap, and 61 of them name it in job posts they wrote. Software Engineer is the role that names it most often.

Data as of November 9, 2026. Source: Sumble.

## Which companies name HashMap in the most job posts?

Wissen Technology, Capgemini and CME Group mention HashMap in the most job posts. CME Group has named it in job posts the longest of the five companies in the table, since April 2023.

| Company | Job posts | Recent job post |
|---|---:|---|
| [Wissen Technology](https://sumble.com/orgs/wissen-technology-private-limited) | 16 | "Strong knowledge of Collections Framework (ArrayList, Vector, LinkedList, HashMap, HashTable, HashSet)" (Java Developer (3-6 Years), Jul 18, 2025) |
| [Capgemini](https://sumble.com/orgs/capgemini) | 14 | "Experience in collections, HashMap, concurrency packages and ArrayList, sorting algorithm" (java engineer, Sep 2, 2026) |
| [CME Group](https://sumble.com/orgs/cme-group) | 11 | "Proficiency in Multi-threading , concurrent data structures, shared memory, synchronization, JNI, NIO, Hashmap etc." (Staff/Lead Software Engineer, Jan 12, 2026) |
| [Synechron](https://sumble.com/orgs/synechron) | 9 | "Good experience in datastructures, multithreading, collections, hashmap" (core java developer, Oct 22, 2026) |
| [Xideral](https://sumble.com/orgs/xideral) | 6 | "Manejo de colecciones Java: ArrayList, HashMap, HashSet, entre otras." (java academy jr. 2562/09, Aug 26, 2025) |

## How do we know which companies use HashMap?

Employees' profiles account for 70% of the companies here. 61 companies name HashMap in job posts they wrote. 3 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name HashMap | 61 | 30% |
| Employees' profiles list HashMap | 140 | 70% |

## What size are the companies that use HashMap?

Big companies stand out among HashMap users: companies with more than 5,000 employees are 39% of them, against 23% on the typical tech page. The second-largest group is companies with 50 to 999 employees, at 27%.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 16% | 22% |
| 50 to 999 | 27% | 38% |
| 1,000 to 5,000 | 17% | 17% |
| Over 5,000 | 39% | 23% |

## Where are HashMap companies based?

India is 3.4 times as common among HashMap companies as on the typical tech page, at 23%. The United States leads overall with 49%. Its companies are based in 24 countries and territories.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 95 | 49% | 43% |
| India | 45 | 23% | 6.9% |
| France | 7 | 3.6% | 4.6% |
| Brazil | 6 | 3.1% | 2.8% |
| Canada | 6 | 3.1% | 3.6% |
| United Kingdom | 6 | 3.1% | 6.4% |

## About this data

Sumble built this page. Sumble gives sales, marketing and other GTM teams technographics and hiring signals for the companies they sell to: the technologies each company uses, which teams are hiring and for what, and who reports to whom. That helps a team know who to contact, why now, and what to say.

Sumble covers more than 3.6 million companies, 93 million job posts collected since 2022 and 194 million employee profiles, and tracks more than 37,000 technologies. It finds which technologies a company uses by reading its job posts and its employees' public profiles.

Sumble has a free plan, and the same data is available through its API and MCP server.

A company counts when its own job posts or its employees' public profiles name the technology. Hiring is that technology's share of all job posts collected each month. Quotes are copied word for word from the companies' job posts.

Every figure on this page comes from Sumble's own analysis, and you won't find it outside Sumble.