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.
The companies with the most job posts naming uCOS are Qualcomm (82), TechnipFMC (49) and Visionist, Inc. (49).
CompanyPostsPeopleRecent job post
QualcommScientific and Technical Services · first seen Sep 2022827
"Demonstrated development experience with embedded OSes such as Zephyr, eCos, uC/OS or FreeRTOS"firmware development engineer, sr. staff, Oct 21, 2026
TechnipFMCProfessional Services · first seen Sep 20224913
"Configure and version automation software (TechnipFMC proprietary systems: UCOS, InControl, SmartTool, and network components)."Configuration Engineer - C&A, Apr 23, 2026
Visionist, Inc.Professional Services · first seen Jan 2024490
"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 LabsScientific and Technical Services · first seen Jan 2024343
"Working knowledge of RTOS-based systems (e.g., uC/OS, FreeRTOS, or similar)."Senior Engineer - SQA, May 27, 2026
SiemensUtilities · first seen May 2023214
"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
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.
Show the data
Month
Job posts naming uCOS
All job posts
Per 10,000
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.
March to May 20266
June to August 20269
October 2025 to August 202622
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 knowCompaniesShare
Job posts name uCOS
21630%
Employees' profiles list uCOS
51070%
726 companies. Each is counted once, under the strongest evidence we have for it.
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.
Share of its companies
Typical tech page
ShareTypical
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.
ShareTypical
United States
44%43%
China
9.7%0.48%
India
6.9%6.9%
Germany
4.2%4.4%
United Kingdom
4.2%6.4%
France
3.8%4.6%
Companies in 46 countries and territories. Shares are of companies with a known headquarters country.
Show the data
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%
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.
Share of the 124 uCOS companies counted here whose job posts also name the tool
Typical for companies the same size
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.
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.
RoleSharePosts
Embedded Engineer
49%87
Firmware Engineer
18%32
Software Engineer
11%20
Robotics Engineer
5.7%10
Engineer
4%7
Software Development Engineer in Test
1.7%3
Show the data
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
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.
