638 companies use RTEMS, based on their job posts and their employees' public profiles. Its share of job posts held steady in the three months to August 2026; 266 job posts named it from October 2025 to August 2026. Embedded Engineer is the role that names it most often.
The companies with the most job posts naming RTEMS are D-Orbit (50), TMC (43) and Viveris (40). Altran is the newest of the five companies in the table, with its first job post naming it in January 2026.
CompanyPostsPeopleRecent job post
D-OrbitProfessional Services · first seen Jul 2023503
"Knowledge of real-time operating systems (such as RTEMS or FreeRTOS) and/or operating systems targeted for embedded applications (such as any embedded Linux)"Senior Flight Software Engineer, Nov 3, 2026
TMCProfessional Services · first seen Jul 2023431
"…in any language from the C family Knowledge of real-time operating systems (such as RTEMS or FreeRTOS) and/or operating systems designed for embedded applications (such as any embedded Linux)…"Embedded Software Engineer - Aerospace, Apr 22, 2026
ViverisProfessional Services · first seen Jul 2023400
" Expérience en développement temps réel avec OS type VxWorks, RTEMS, RTOS"real-time embedded software engineer - space m/f, Aug 7, 2025
AltranProfessional Services · first seen Jan 2026363
"Linux temps réel (PREEMPT_RT), VxWorks, PikeOS, RTEMS, FreeRTOS"low-level embedded software architect, Oct 24, 2026
Los Alamos National LaboratoryPublic Administration · first seen Sep 2022302
"Real-time system programming experience with VxWorks or RTEMS."Low-Level Radio Frequency Engineer (R&D Engineer 2/3), Sep 13, 2026
RTEMS holds a steady place in hiring. 0.16 in every 10,000 job posts named it from June to August 2026, against 0.16 from March to May. From October to December 2025 it was 0.10.
Show the data
Month
Job posts naming RTEMS
All job posts
Per 10,000
Oct 2025
16
1,413,673
0.11
Nov 2025
18
1,822,119
0.10
Dec 2025
10
1,236,103
0.08
Jan 2026
25
1,828,002
0.14
Feb 2026
18
1,856,647
0.10
Mar 2026
29
1,850,711
0.16
Apr 2026
24
1,728,886
0.14
May 2026
35
1,821,509
0.19
Jun 2026
38
1,909,496
0.20
Jul 2026
21
1,815,180
0.12
Aug 2026
32
1,835,698
0.17
How many companies named RTEMS in a job post for the first time in recent months?
Job posts named RTEMS for the first time at 16 companies from June to August 2026, against 20 from March to May. The 16 from June to August are 5.8% of all 278 companies whose job posts name it.
March to May 202620
June to August 202616
October 2025 to August 202668
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 RTEMS?
278 of the 638 companies name RTEMS in their own job posts. The other 360 show up because employees list it on their profiles. 45 show up in both job posts and employees' profiles.
How we knowCompaniesShare
Job posts name RTEMS
27844%
Employees' profiles list RTEMS
36056%
638 companies. Each is counted once, under the strongest evidence we have for it.
What size are the companies that use RTEMS?
No size of company stands out for RTEMS. Companies with 50 to 999 employees make up the largest group, at 40%. The second-largest group is companies with more than 5,000 employees, at 23%.
Share of its companies
Typical tech page
ShareTypical
Under 50 employees
22%22%
50 to 999
40%38%
1,000 to 5,000
15%17%
Over 5,000
23%23%
Where are RTEMS companies based?
RTEMS has an unusually large following in Italy: 4.8% of its companies, against 1.5% on the typical tech page. France is second, at 8.7%.
ShareTypical
United States
39%43%
France
8.7%4.6%
Germany
6.9%4.4%
Spain
5.6%1.8%
Italy
4.8%1.5%
Switzerland
3.8%1.5%
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
236
39%
43%
France
53
8.7%
4.6%
Germany
42
6.9%
4.4%
Spain
34
5.6%
1.8%
Italy
29
4.8%
1.5%
Switzerland
23
3.8%
1.5%
Which teams work with RTEMS?
RTEMS turns up most in job posts for engineering, embedded software and flight software teams. Engineering division and orion program teams follow, at 3 companies each.
TeamCompanies
Engineering
5
Embedded software
4
Flight software
4
Engineering division
3
Orion program
3
Avionics
2
What else do RTEMS companies use?
RTEMS companies are 811 times as likely as similar companies to use SpaceWire: 39% of them, against 0.05%. Next is VxWorks: 62% of these companies use it, against 0.21% of similar ones.
Share of the 181 RTEMS companies counted here whose job posts also name the tool
Typical for companies the same size
Which companies started naming RTEMS in job posts recently?
Between April and August 2026, RTEMS appeared for the first time in job posts at 19 companies: 13 commercial, 5 mid-market and 1 enterprise. Command Post Technologies, Inc has the most job posts of the new commercial companies, 5 from April to August.
Companies that named RTEMS 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 RTEMS most?
Embedded Engineer is the most common role, in 32% of job posts naming RTEMS. The top four roles cover 72% of these job posts.
RoleSharePosts
Embedded Engineer
32%85
Software Engineer
20%54
Aerospace Engineer
11%30
Firmware Engineer
8.3%22
Electrical Engineer
1.9%5
Control Engineer
1.5%4
Show the data
Role
Share
Oct 2025 to Aug 2026
Mar to May 2026
Jun to Aug 2026
Embedded Engineer
32%
85
27
30
Software Engineer
20%
54
14
18
Aerospace Engineer
11%
30
11
12
Firmware Engineer
8.3%
22
7
3
Electrical Engineer
1.9%
5
3
1
Control Engineer
1.5%
4
2
2
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.
