We found 1,817 companies that use RS422. 1,169 of them name it in their own job posts, and the rest through employees' public profiles. Its share of job posts held steady in the three months to August 2026; 1,516 job posts named it from October 2025 to August 2026.
L3Harris Technologies and Northrop Grumman have the most job posts naming RS422, with 214 and 209. Raytheon Technologies is the newest of the five companies in the table, with its first job post naming it in June 2023.
CompanyPostsPeopleRecent job post
L3Harris TechnologiesManufacturing · first seen Jul 20222142
"Working with various serial communication protocols such as RS-232, RS-422, SPI, I2C, etc."Sr. Specialist, Electrical Engineering (FOS), Oct 24, 2026
Northrop GrummanManufacturing · first seen Jul 202220912
"Design and analyze digital communication interfaces (e.g., RS-422, Gigabit Ethernet), including bandwidth and latency considerations"Electrical Engineering Systems Architect - 6, Oct 22, 2026
Blue OriginManufacturing · first seen Sep 20222021
"Experience integrating communication systems into larger systems, including definition of management and data interfaces using protocols like RS-422, Ethernet, SpaceWire, HDLC, etc."Senior Communications Systems Engineer - Lunar Permanence, Nov 4, 2026
Raytheon TechnologiesManufacturing · first seen Jun 20231803
"Working knowledge in common computer hardware interface and data protocols such as TCP/IP, UDP, RS-422, USB, PCI, and 1553"Software Engineer I (Onsite), Nov 1, 2026
Honeywell TechnologiesManufacturing · first seen Jul 202215011
"Hands-on experience with communication protocols like UART, RS-422, RS-485, I2C, SPI, CAN, USB, Ethernet."Advanced Hardware Engr, May 22, 2026
RS422 holds a steady place in hiring. 0.91 in every 10,000 job posts named it from June to August 2026, against 0.84 from March to May. From October to December 2025 it was 0.72.
Show the data
Month
Job posts naming RS422
All job posts
Per 10,000
Oct 2025
97
1,413,673
0.69
Nov 2025
137
1,822,119
0.75
Dec 2025
86
1,236,103
0.70
Jan 2026
111
1,828,002
0.61
Feb 2026
121
1,856,647
0.65
Mar 2026
148
1,850,711
0.80
Apr 2026
134
1,728,886
0.78
May 2026
174
1,821,509
0.96
Jun 2026
158
1,909,496
0.83
Jul 2026
187
1,815,180
1.0
Aug 2026
163
1,835,698
0.89
How many companies named RS422 in a job post for the first time in recent months?
Job posts named RS422 for the first time at 54 companies from June to August 2026, against 49 from March to May. Of the 1,169 companies whose job posts name it, 4.6% first named it from June to August.
March to May 202649
June to August 202654
October 2025 to August 2026166
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 RS422?
For RS422, the evidence comes mostly from job posts. 1,169 companies name it in their own posts. 648 come from employees' profiles alone.
How we knowCompaniesShare
Job posts name RS422
1,16964%
Employees' profiles list RS422
64836%
1,817 companies. Each is counted once, under the strongest evidence we have for it.
What size are the companies that use RS422?
Companies with fewer than 50 employees are 1.2 times as common among RS422 users as on the typical tech page. 308 of its companies have more than 5,000 employees.
Share of its companies
Typical tech page
ShareTypical
Under 50 employees
27%22%
50 to 999
42%38%
1,000 to 5,000
14%17%
Over 5,000
17%23%
Where are RS422 companies based?
RS422 has an unusually large following in Turkey: 4.7% of its companies, against 0.75% on the typical tech page. Its companies are based in 62 countries and territories.
ShareTypical
United States
45%43%
India
10%6.9%
France
4.9%4.6%
United Kingdom
4.9%6.4%
Turkey
4.7%0.75%
Canada
3.6%3.6%
Companies in 62 countries and territories. Shares are of companies with a known headquarters country.
Show the data
Country
Companies
Share
Typical tech page
United States
775
45%
43%
India
177
10%
6.9%
France
84
4.9%
4.6%
United Kingdom
84
4.9%
6.4%
Turkey
80
4.7%
0.75%
Canada
61
3.6%
3.6%
Which teams work with RS422?
Job posts for RS422 point to engineering teams far more than any other, at 36 companies.
TeamCompanies
Engineering
36
Avionics
18
Electrical engineering
12
Electronics & electrical section
12
Software
10
Systems engineering
10
What else do RS422 companies use?
RS422 companies are 326 times as likely as similar companies to use SpaceWire: 15% of them, against 0.05%. Among the tools listed here, VxWorks is the most widely used, at 21% of RS422 companies.
Share of the 764 RS422 companies counted here whose job posts also name the tool
Typical for companies the same size
Which companies started naming RS422 in job posts recently?
48 companies with 50 or more employees started naming RS422 in job posts between April and August 2026. 6 of them have more than 5,000 employees. Tracsis and FishEye Software, Inc. lead the new commercial companies, with 5 job posts each from April to August.
Companies that named RS422 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 RS422 most?
RS422 comes up equally often in Electrical Engineer and Embedded Engineer job posts, 12% each. Electrical Engineer posts naming it numbered 50 from March to May 2026 and 64 from June to August.
RoleSharePosts
Electrical Engineer
12%179
Embedded Engineer
12%179
Software Engineer
12%175
Hardware Engineer
11%166
Software Development Engineer in Test
7.3%110
Aerospace Engineer
6.7%101
Show the data
Role
Share
Oct 2025 to Aug 2026
Mar to May 2026
Jun to Aug 2026
Electrical Engineer
12%
179
50
64
Embedded Engineer
12%
179
55
49
Software Engineer
12%
175
44
49
Hardware Engineer
11%
166
57
63
Software Development Engineer in Test
7.3%
110
27
38
Aerospace Engineer
6.7%
101
24
34
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.
