# Companies using F#

7,279 companies in our data use F#, and 973 of them name it in job posts they wrote. 577 job posts named it from October 2025 to August 2026. Software Engineer is the role that names it most often.

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

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

Infosys, Genetec and Anduril Industries mention F# in the most job posts. Of the five companies in the table, SimCorp has the most employees who list it on their profiles: 30.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Infosys](https://sumble.com/orgs/infosys) | 212 | 3 | "Design, develop, and enhance software solutions using .NET Core programming languages, including C#, F#, and Visual Basic." (.net lead, Oct 22, 2026) |
| [Genetec](https://sumble.com/orgs/genetec) | 83 | 25 | "Using functional and object-oriented programming languages (we program in F# and C#, and yes, we're happy to teach you) " (Software developer - access control, Nov 1, 2026) |
| [Anduril Industries](https://sumble.com/orgs/anduril-1) | 71 | 0 | "Experience (professional or in the setting of an open source community) working with typed functional programming languages (Haskell, Scala, F#, OCaml, Rust, etc.)" (embedded haskell engineer, ew, Jul 7, 2026) |
| [SimCorp](https://sumble.com/orgs/simcorp) | 57 | 30 | "Experience with OCaml or other functional languages (Haskell, Scala, F#, or similar), domain-specific languages, Web APIs, or financial software would be useful - but you do not…" (Senior Software Engineer – OCaml/C# – OTC Core, Nov 7, 2026) |
| [Halliburton](https://sumble.com/orgs/halliburton) | 48 | 6 | "Familiar with programming languages such as C#, F#, JavaScript is a plus" (Principal Software Developer - Python, Nov 7, 2026) |

## Is hiring for F# growing?

From March to May 2026, 0.20 in every 10,000 job posts named F#; from June to August, 0.30 in every 10,000 job posts. These are small numbers of job posts, so a few companies can move them.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 71 | 1,413,673 | 0.50 |
| Nov 2025 | 66 | 1,822,119 | 0.36 |
| Dec 2025 | 44 | 1,236,103 | 0.36 |
| Jan 2026 | 73 | 1,828,002 | 0.40 |
| Feb 2026 | 48 | 1,856,647 | 0.26 |
| Mar 2026 | 26 | 1,850,711 | 0.14 |
| Apr 2026 | 32 | 1,728,886 | 0.19 |
| May 2026 | 50 | 1,821,509 | 0.27 |
| Jun 2026 | 65 | 1,909,496 | 0.34 |
| Jul 2026 | 46 | 1,815,180 | 0.25 |
| Aug 2026 | 56 | 1,835,698 | 0.31 |

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

F# showed up in job posts at 25 companies for the first time from June to August 2026, and 16 in the three months before. Of the 973 companies whose job posts name it, 2.6% first named it from June to August.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 16 |
| June to August 2026 | 25 |
| October 2025 to August 2026 | 84 |

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 F#?

87% of the companies here are known from employees' profiles alone, and 13% name F# in their own job posts. 286 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name F# | 973 | 13% |
| Employees' profiles list F# | 6,306 | 87% |

## What size are the companies that use F#?

F# skews toward smaller firms. 28% of its users are companies with fewer than 50 employees, against 22% on the typical tech page. 1,055 of its companies have more than 5,000 employees.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 28% | 22% |
| 50 to 999 | 41% | 38% |
| 1,000 to 5,000 | 16% | 17% |
| Over 5,000 | 14% | 23% |

## Where are F# companies based?

Denmark is 8.1 times as common among F# companies as on the typical tech page, at 5.6%. The United States leads overall with 38%. Its companies are based in 110 countries and territories.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 2,674 | 38% | 43% |
| United Kingdom | 669 | 9.6% | 6.4% |
| Denmark | 388 | 5.6% | 0.69% |
| Germany | 321 | 4.6% | 4.4% |
| France | 221 | 3.2% | 4.6% |
| Sweden | 212 | 3% | 1% |

## Which teams work with F#?

At 17 companies, the team named in F# job posts is engineering, at least twice the next. IT and platform teams come next, at 8 companies each.

| Team | Companies |
|---|---:|
| Engineering | 17 |
| IT | 8 |
| Platform | 8 |
| Development | 7 |
| R&D | 7 |
| Software development | 6 |

## Which roles mention F# most?

Software Engineer job posts naming F# grew the fastest among its top roles: 96 from June to August 2026, up from 56 from March to May. The top four roles cover 67% of these job posts.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Software Engineer | 61% | 352 | 56 | 96 |
| Embedded Engineer | 2.3% | 13 | 2 | 1 |
| Software Development Engineer in Test | 1.9% | 11 | 5 | 3 |
| Systems Engineer | 1.7% | 10 | 2 | 0 |
| Business Systems | 1.4% | 8 | 1 | 0 |
| Data Engineer | 1.4% | 8 | 2 | 1 |

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

19 companies with 50 or more employees started naming F# in job posts between April and August 2026. 4 of them have more than 5,000 employees. Allstate leads the new enterprise companies, with 7 job posts from April to August.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [Oteemo Inc.](https://sumble.com/orgs/oteemo) | 2 |
| Commercial | [Allstate Northern Ireland](https://sumble.com/orgs/allstate-northern-ireland) | 1 |
| Commercial | [Quantinuum](https://sumble.com/orgs/quantinuum) | 1 |
| Commercial | [North American Production Sharing, LLC](https://sumble.com/orgs/north-american-production-sharing) | 1 |
| Commercial | [Larcier-Intersentia](https://sumble.com/orgs/larcier-intersentia) | 1 |
| Mid-market | [Rocket](https://sumble.com/orgs/linktree-rocket-official) | 1 |
| Mid-market | [PowerSchool](https://sumble.com/orgs/powerschool) | 1 |
| Mid-market | [Allstate Canada](https://sumble.com/orgs/allstatecanada) | 1 |
| Mid-market | [Relativity](https://sumble.com/orgs/relativity) | 1 |
| Mid-market | [10Pearls](https://sumble.com/orgs/10pearls) | 1 |
| Enterprise | [Allstate](https://sumble.com/orgs/allstate-insurance) | 7 |
| Enterprise | [Capco](https://sumble.com/orgs/capco) | 2 |
| Enterprise | [B. Braun Group](https://sumble.com/orgs/b-braun) | 1 |
| Enterprise | [Newell Brands](https://sumble.com/orgs/newell-brands) | 1 |

Companies that named F# 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 F# companies use?

The tool most tied to F# is OCaml. 10% of F# companies use it, 163 times the usual rate for their size. Haskell is 117 times as common as usual, at 20%.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| OCaml | 64 | 10% | 0.06% | 163 times |
| Haskell | 128 | 20% | 0.17% | 117 times |
| Clojure | 80 | 13% | 0.2% | 63 times |
| Erlang | 41 | 6.5% | 0.19% | 34 times |
| Elixir | 65 | 10% | 0.35% | 29 times |
| Enzyme | 39 | 6.2% | 0.49% | 13 times |
| SpecFlow | 40 | 6.3% | 0.55% | 12 times |
| Mercurial | 42 | 6.6% | 0.57% | 12 times |

Shares are out of the 634 companies whose job posts name F#, not counting firms whose job posts name almost every technology.

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

Apart from broad digital transformation work, Microservices Migration comes up most in job posts naming F#, in 72 of them. After that comes Cloud Cost Optimization, with 33.

| Project theme | Job posts |
|---|---:|
| Digital Transformation | 375 |
| Microservices Migration | 72 |
| Cloud Cost Optimization | 33 |
| Data Infrastructure Migration | 29 |

- "Lead the design and implementation of new microservices and APIs using F# and the .NET framework, prioritizing immutability, concurrency, and correctness." (KMS Technology, Inc., Senior Full stack Software Engineer - F#, Dec 16, 2025)

## 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.