# Companies using uCOS

We found 726 companies that use uCOS. 216 of them name it in their own job posts, and the rest through employees' public profiles. From October 2025 to August 2026, 176 job posts named it. It comes up most in Embedded Engineer job posts.

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

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

The companies with the most job posts naming uCOS are Qualcomm (82), TechnipFMC (49) and Visionist, Inc. (49).

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Qualcomm](https://sumble.com/orgs/qualcomm) | 82 | 7 | "Demonstrated development experience with embedded OSes such as Zephyr, eCos, uC/OS or FreeRTOS" (firmware development engineer, sr. staff, Oct 21, 2026) |
| [TechnipFMC](https://sumble.com/orgs/technipfmc) | 49 | 13 | "Configure and version automation software (TechnipFMC proprietary systems: UCOS, InControl, SmartTool, and network components)." (Configuration Engineer - C&A, Apr 23, 2026) |
| [Visionist, Inc.](https://sumble.com/orgs/visionist) | 49 | 0 | "Experience with low-level programming in Windows, Linux, or real-time operating systems (RTOS) such as VxWorks or uC/OS" (Senior Embedded Developer with Security Clearance, Aug 2, 2026) |
| [Silicon Labs](https://sumble.com/orgs/silicon-labs) | 34 | 3 | "Working knowledge of RTOS-based systems (e.g., uC/OS, FreeRTOS, or similar)." (Senior Engineer - SQA, May 27, 2026) |
| [Siemens](https://sumble.com/orgs/siemens) | 21 | 4 | "Experience with Linux (any flavor) and Real-Time Operating Systems (RTOS) such as VxWorks, LynxOS, eCos, RTLinux, Nucleus, or UCOS." (Embedded Firmware Developer, Nov 7, 2026) |

## Is hiring for uCOS growing?

uCOS appeared in 0.12 in every 10,000 job posts from June to August 2026, against 0.09 from March to May. These are small numbers of job posts, so a few companies can move them.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 10 | 1,413,673 | 0.07 |
| Nov 2025 | 7 | 1,822,119 | 0.04 |
| Dec 2025 | 9 | 1,236,103 | 0.07 |
| Jan 2026 | 13 | 1,828,002 | 0.07 |
| Feb 2026 | 25 | 1,856,647 | 0.13 |
| Mar 2026 | 20 | 1,850,711 | 0.11 |
| Apr 2026 | 14 | 1,728,886 | 0.08 |
| May 2026 | 14 | 1,821,509 | 0.08 |
| Jun 2026 | 28 | 1,909,496 | 0.15 |
| Jul 2026 | 20 | 1,815,180 | 0.11 |
| Aug 2026 | 16 | 1,835,698 | 0.09 |

## How many companies named uCOS in a job post for the first time in recent months?

In the three months to August 2026, 9 companies posted about uCOS for the first time. From March to May, 6 did. From October 2025 to August 2026, 22 companies named it in a job post for the first time.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 6 |
| June to August 2026 | 9 |
| October 2025 to August 2026 | 22 |

Companies whose first job post naming it appeared in that period. Recruiters, staffing firms and job boards are left out.

## How do we know which companies use uCOS?

70% of the companies here are known from employees' profiles alone, and 30% name uCOS in their own job posts. 26 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name uCOS | 216 | 30% |
| Employees' profiles list uCOS | 510 | 70% |

## What size are the companies that use uCOS?

Big companies stand out among uCOS users: companies with more than 5,000 employees are 30% of them, against 23% on the typical tech page. 152 of its companies have fewer than 50 employees.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 21% | 22% |
| 50 to 999 | 32% | 38% |
| 1,000 to 5,000 | 16% | 17% |
| Over 5,000 | 30% | 23% |

## Where are uCOS companies based?

The United States has the most uCOS companies (44%), but China stands out: 9.7% of them, against 0.48% on the typical tech page. The United Kingdom is less common than usual, at 4.2% against 6.4% on the typical tech page.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 304 | 44% | 43% |
| China | 67 | 9.7% | 0.48% |
| India | 48 | 6.9% | 6.9% |
| Germany | 29 | 4.2% | 4.4% |
| United Kingdom | 29 | 4.2% | 6.4% |
| France | 26 | 3.8% | 4.6% |

## Which roles mention uCOS most?

Embedded Engineer is the most common role, in 49% of job posts naming uCOS. Embedded Engineer posts naming it numbered 23 from March to May 2026 and 35 from June to August.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Embedded Engineer | 49% | 87 | 23 | 35 |
| Firmware Engineer | 18% | 32 | 7 | 13 |
| Software Engineer | 11% | 20 | 5 | 3 |
| Robotics Engineer | 5.7% | 10 | 2 | 4 |
| Engineer | 4% | 7 | 2 | 1 |
| Software Development Engineer in Test | 1.7% | 3 | 3 | 0 |

## Which companies started naming uCOS in job posts recently?

7 companies with 50 or more employees picked up uCOS in their job posts from April to August 2026.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [维谛技术（Vertiv China）](https://sumble.com/orgs/vertivchina) | 2 |
| Commercial | [Electrical Reliability Services, Inc.](https://sumble.com/orgs/electrical-reliability-services) | 1 |
| Commercial | [Espressif Systems](https://sumble.com/orgs/espressif-systems) | 1 |
| Enterprise | [KPIT](https://sumble.com/orgs/kpit-technologies) | 2 |
| Enterprise | [Marvell Technology](https://sumble.com/orgs/marvell-technology) | 1 |
| Enterprise | [General Atomics Aeronautical Systems](https://sumble.com/orgs/ga-asi) | 1 |

Companies that named uCOS in a job post for the first time between April and August 2026, ranked by their job posts in those months. AI-native companies get a group of their own, whatever their size. Recruiters and job boards are left out.

## What else do uCOS companies use?

uCOS companies are 182 times as likely as similar companies to use SDIO: 11% of them, against 0.06%. Next is ThreadX: 15% of these companies use it, against 0.09% of similar ones.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| SDIO | 14 | 11% | 0.06% | 182 times |
| ThreadX | 19 | 15% | 0.09% | 173 times |
| PowerPC | 10 | 8.1% | 0.06% | 138 times |
| VxWorks | 34 | 27% | 0.2% | 134 times |
| FreeRTOS | 76 | 61% | 0.58% | 105 times |
| ARM Cortex | 13 | 10% | 0.12% | 86 times |
| MIPI | 15 | 12% | 0.15% | 81 times |
| LVDS | 14 | 11% | 0.15% | 74 times |

Shares are out of the 124 companies whose job posts name uCOS, not counting firms whose job posts name almost every technology.

## 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.