# Companies using RS232

We found 10,026 companies that use RS232. 4,484 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; 3,766 job posts named it from October 2025 to August 2026. It comes up most in Software Engineer job posts.

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

## Which companies name RS232 in the most job posts?

Anduril Industries, L3Harris Technologies and Honeywell Technologies are among the companies with the most job posts naming RS232. Of the five companies in the table, Honeywell Technologies has the most employees who list it on their profiles: 54.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Anduril Industries](https://sumble.com/orgs/anduril-1) | 289 | 18 | "Experience with computer hardware communication protocols: USB, Ethernet, RS232, RS485, PCIe, HDMI, CAN, etc." (Production Test Engineering Manager, EW, Nov 7, 2026) |
| [L3Harris Technologies](https://sumble.com/orgs/l3harris) | 280 | 11 | "Working with various serial communication protocols such as RS-232, RS-422, SPI, I2C, etc." (Sr. Specialist, Electrical Engineering (FOS), Oct 24, 2026) |
| [Honeywell Technologies](https://sumble.com/orgs/honeywell) | 243 | 54 | "Establish Modbus communication (TCP/IP, RS232, RS485) for integration with terminal servers, PLCs, SCADA and DCS." (systems engr ii, Nov 7, 2026) |
| [Northrop Grumman](https://sumble.com/orgs/northrop-grumman) | 201 | 38 | "Familiarity with common industry standards related to communications systems, such as MIL-STD-1553, RS-422, RS-232, IPv4/IPv6" (Staff Electronics Integration Engineer, Nov 2, 2026) |
| [Altran](https://sumble.com/orgs/capgemini-engineering) | 175 | 28 | "Experience with communication protocols including TCP/IP, UDP, CAN, SPI, and RS232." (Embedded Software Engineer, Sep 1, 2026) |

## Is hiring for RS232 growing?

RS232 holds a steady place in hiring. 2.0 in every 10,000 job posts named it from June to August 2026, against 2.1 from March to May. From October to December 2025 it was 1.8.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 246 | 1,413,673 | 1.7 |
| Nov 2025 | 349 | 1,822,119 | 1.9 |
| Dec 2025 | 213 | 1,236,103 | 1.7 |
| Jan 2026 | 306 | 1,828,002 | 1.7 |
| Feb 2026 | 366 | 1,856,647 | 2.0 |
| Mar 2026 | 385 | 1,850,711 | 2.1 |
| Apr 2026 | 365 | 1,728,886 | 2.1 |
| May 2026 | 401 | 1,821,509 | 2.2 |
| Jun 2026 | 386 | 1,909,496 | 2.0 |
| Jul 2026 | 349 | 1,815,180 | 1.9 |
| Aug 2026 | 400 | 1,835,698 | 2.2 |

## How many companies named RS232 in a job post for the first time in recent months?

Job posts named RS232 for the first time at 168 companies from June to August 2026, against 147 from March to May. The 168 from June to August are 3.7% of all 4,484 companies whose job posts name it.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 147 |
| June to August 2026 | 168 |
| October 2025 to August 2026 | 513 |

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 RS232?

The evidence for RS232 is close to even: 45% of these companies name it in job posts, and 55% come from employees' profiles. 868 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name RS232 | 4,484 | 45% |
| Employees' profiles list RS232 | 5,542 | 55% |

## What size are the companies that use RS232?

Companies with fewer than 50 employees are 1.4 times as common among RS232 users as on the typical tech page. 1,165 of its companies have more than 5,000 employees.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 30% | 22% |
| 50 to 999 | 44% | 38% |
| 1,000 to 5,000 | 14% | 17% |
| Over 5,000 | 12% | 23% |

## Where are RS232 companies based?

Beyond the United States (37%), RS232 is unusually common in India, at 12% of its companies. Its companies are based in 103 countries and territories.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 3,546 | 37% | 43% |
| India | 1,139 | 12% | 6.9% |
| United Kingdom | 537 | 5.7% | 6.4% |
| France | 446 | 4.7% | 4.6% |
| Germany | 414 | 4.4% | 4.4% |
| Canada | 398 | 4.2% | 3.6% |

## Which teams work with RS232?

Job posts most often place RS232 with engineering, R&D and product development teams. Electrical engineering teams come fourth, at 28 companies.

| Team | Companies |
|---|---:|
| Engineering | 115 |
| R&D | 84 |
| Product development | 34 |
| Electrical engineering | 28 |
| Software | 27 |
| Software engineering | 26 |

## Which roles mention RS232 most?

Software Engineer and Electrical Engineer roles account for 21% of the job posts that name RS232. Software Engineer posts naming it numbered 137 from March to May 2026 and 116 from June to August.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Software Engineer | 12% | 441 | 137 | 116 |
| Electrical Engineer | 8.8% | 332 | 98 | 105 |
| Embedded Engineer | 8.4% | 315 | 95 | 81 |
| Firmware Engineer | 7.6% | 287 | 88 | 82 |
| Hardware Engineer | 7.5% | 284 | 99 | 75 |
| Software Development Engineer in Test | 6.3% | 238 | 57 | 72 |

## Which companies started naming RS232 in job posts recently?

145 companies with 50 or more employees picked up RS232 in their job posts from April to August 2026. National University of Singapore leads the new enterprise companies, with 12 job posts from April to August.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| AI native | [Lila Sciences](https://sumble.com/orgs/lila-sciences) | 3 |
| AI native | [Aureka Biotechnologies, Inc.](https://sumble.com/orgs/aurekabio) | 1 |
| AI native | [Prepaire Labs](https://sumble.com/orgs/prepare-com) | 1 |
| Commercial | [MWI Animal Health](https://sumble.com/orgs/mwi) | 7 |
| Commercial | [SimoTech](https://sumble.com/orgs/simotech) | 4 |
| Commercial | [LabLogic Systems](https://sumble.com/orgs/lablogic-systems) | 4 |
| Commercial | [Voyager Technologies](https://sumble.com/orgs/voyager-space-holdings) | 3 |
| Commercial | [Precise Systems, Inc.](https://sumble.com/orgs/precise-systems) | 3 |
| Mid-market | [WNC Corporation](https://sumble.com/orgs/w-neweb) | 5 |
| Mid-market | [Oesia](https://sumble.com/orgs/oesia) | 3 |
| Mid-market | [Teltonika](https://sumble.com/orgs/teltonika) | 3 |
| Mid-market | [Dorman Products](https://sumble.com/orgs/dorman-products) | 3 |
| Mid-market | [Ring](https://sumble.com/orgs/ring) | 3 |
| Enterprise | [National University of Singapore](https://sumble.com/orgs/national-university-of-singapore) | 12 |
| Enterprise | [Exelon](https://sumble.com/orgs/exelon) | 3 |
| Enterprise | [Hitachi Rail](https://sumble.com/orgs/hitachi-rail) | 2 |
| Enterprise | [Senai São Paulo](https://sumble.com/orgs/senaisp) | 2 |
| Enterprise | [Queensland Government](https://sumble.com/orgs/queensland-government) | 1 |

Companies that named RS232 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 RS232 companies use?

Compared with companies of the same size, RS232 companies stand out for using RS422 and RS485. Among the tools listed here, SPI is the most widely used, at 54% of RS232 companies.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| RS422 | 450 | 13% | 0.16% | 85 times |
| RS485 | 1,780 | 53% | 0.7% | 75 times |
| LVDS | 178 | 5.3% | 0.15% | 35 times |
| I2C | 1,777 | 53% | 1.6% | 34 times |
| SPI | 1,834 | 54% | 1.8% | 31 times |
| VxWorks | 211 | 6.3% | 0.21% | 30 times |
| PSpice | 337 | 10% | 0.35% | 29 times |
| OrCAD | 566 | 17% | 0.6% | 28 times |

Shares are out of the 3,374 companies whose job posts name RS232, not counting firms whose job posts name almost every technology.

## Which project themes come up in RS232 job posts?

Apart from broad digital transformation work, Microservices Migration comes up most in job posts naming RS232, in 17 of them. Broad digital transformation work shows up in 383 of its job posts.

| Project theme | Job posts |
|---|---:|
| Digital Transformation | 383 |
| Microservices Migration | 17 |
| Data Infrastructure Migration | 7 |
| Security Infrastructure Modernization | 3 |

## 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.