# Companies using RS422

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.

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

## Which companies name RS422 in the most job posts?

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.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [L3Harris Technologies](https://sumble.com/orgs/l3harris) | 214 | 2 | "Working with various serial communication protocols such as RS-232, RS-422, SPI, I2C, etc." (Sr. Specialist, Electrical Engineering (FOS), Oct 24, 2026) |
| [Northrop Grumman](https://sumble.com/orgs/northrop-grumman) | 209 | 12 | "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 Origin](https://sumble.com/orgs/blue-origin) | 202 | 1 | "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 Technologies](https://sumble.com/orgs/raytheon) | 180 | 3 | "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 Technologies](https://sumble.com/orgs/honeywell) | 150 | 11 | "Hands-on experience with communication protocols like UART, RS-422, RS-485, I2C, SPI, CAN, USB, Ethernet." (Advanced Hardware Engr, May 22, 2026) |

## Is hiring for RS422 growing?

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.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| 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.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 49 |
| June to August 2026 | 54 |
| October 2025 to August 2026 | 166 |

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 know | Companies | Share |
|---|---:|---:|
| Job posts name RS422 | 1,169 | 64% |
| Employees' profiles list RS422 | 648 | 36% |

## 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.

| Size | Share | Typical tech page |
|---|---:|---:|
| 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.

| 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.

| Team | Companies |
|---|---:|
| Engineering | 36 |
| Avionics | 18 |
| Electrical engineering | 12 |
| Electronics & electrical section | 12 |
| Software | 10 |
| Systems engineering | 10 |

## 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.

| 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 |

## 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.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [Tracsis](https://sumble.com/orgs/tracsis) | 5 |
| Commercial | [FishEye Software, Inc.](https://sumble.com/orgs/fisheye-software) | 5 |
| Commercial | [MWI Animal Health](https://sumble.com/orgs/mwi) | 3 |
| Commercial | [TEKEVER](https://sumble.com/orgs/tekever) | 3 |
| Commercial | [Quest Defense](https://sumble.com/orgs/quest-defense) | 3 |
| Mid-market | [Oesia](https://sumble.com/orgs/oesia) | 3 |
| Mid-market | [Fpt Telecom](https://sumble.com/orgs/fpt-telecom) | 2 |
| Mid-market | [IonQ](https://sumble.com/orgs/ionq) | 2 |
| Mid-market | [OceanPact Serviços Marítimos](https://sumble.com/orgs/oceanpact) | 1 |
| Mid-market | [Reel](https://sumble.com/orgs/reel) | 1 |
| Enterprise | [Sandia National Laboratories](https://sumble.com/orgs/sandia-national-laboratories) | 4 |
| Enterprise | [Hitachi Rail](https://sumble.com/orgs/hitachi-rail) | 2 |
| Enterprise | [AT&T](https://sumble.com/orgs/at&t) | 1 |
| Enterprise | [Thermo Fisher Scientific](https://sumble.com/orgs/thermo-fisher-scientist) | 1 |
| Enterprise | [Queensland Government](https://sumble.com/orgs/queensland-government) | 1 |

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.

## 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.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| SpaceWire | 113 | 15% | 0.05% | 326 times |
| RTEMS | 64 | 8.4% | 0.04% | 219 times |
| FEMAP | 127 | 17% | 0.14% | 122 times |
| Petalinux | 54 | 7.1% | 0.06% | 119 times |
| PATRAN | 66 | 8.6% | 0.08% | 108 times |
| LVDS | 119 | 16% | 0.15% | 107 times |
| VxWorks | 157 | 21% | 0.2% | 103 times |
| Cameo | 151 | 20% | 0.21% | 94 times |

Shares are out of the 764 companies whose job posts name RS422, 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.