# Companies using OCaml

Job posts from 339 companies name OCaml. Counting companies found through employees' public profiles too, the total is 9,336. From October 2025 to August 2026, 236 job posts named it. Software Engineer roles mention it most.

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

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

Among the companies with the most job posts naming OCaml are Anduril Industries (77), SimCorp (46) and Ahrefs (43). Of the five companies in the table, Anduril Industries has the most employees who list it on their profiles: 27.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Anduril Industries](https://sumble.com/orgs/anduril-1) | 77 | 27 | "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) | 46 | 7 | "Implement financial contract models in our OCaml-based domain-specific language, defining their business logic, database mapping, and user-interface layout." (Senior Software Engineer – OCaml/C# – OTC Core, Nov 7, 2026) |
| [Ahrefs](https://sumble.com/orgs/ahrefs) | 43 | 23 | "You'll work remotely within our Middle-end / Tooling team, focusing on improving the observability of Dune, the OCaml build system." (backend engineering intern - ocaml, Apr 27, 2026) |
| [Grab](https://sumble.com/orgs/grab) | 41 | 6 | "…be a good coder in any language (C++, C, Java, Scala, Rust, Haskell, OCaml, Erlang, Python, Ruby, PHP, Node.JS, C#, etc.), but willing to work…" (software engineer, backend, Oct 24, 2026) |
| [CEA](https://sumble.com/orgs/cea-commissariat-a-l-energie-atomique) | 39 | 14 | "CaiSAR is written in Ocaml, PyRAT is written in Python3." (M1/M2 Internship in Computer Science / Artificial Intelligence / Machine Learning (M/F), Nov 1, 2025) |

## Is hiring for OCaml growing?

OCaml appeared in 0.10 in every 10,000 job posts from June to August 2026, against 0.12 from March to May. 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 | 24 | 1,413,673 | 0.17 |
| Nov 2025 | 33 | 1,822,119 | 0.18 |
| Dec 2025 | 13 | 1,236,103 | 0.11 |
| Jan 2026 | 23 | 1,828,002 | 0.13 |
| Feb 2026 | 21 | 1,856,647 | 0.11 |
| Mar 2026 | 22 | 1,850,711 | 0.12 |
| Apr 2026 | 22 | 1,728,886 | 0.13 |
| May 2026 | 21 | 1,821,509 | 0.12 |
| Jun 2026 | 11 | 1,909,496 | 0.06 |
| Jul 2026 | 19 | 1,815,180 | 0.10 |
| Aug 2026 | 27 | 1,835,698 | 0.15 |

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

Job posts named OCaml for the first time at 10 companies from June to August 2026, against 20 from March to May. That brings the companies naming it for the first time since October 2025 to 48, through August 2026.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 20 |
| June to August 2026 | 10 |
| October 2025 to August 2026 | 48 |

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 OCaml?

Of the 9,336 companies here, 8,997 are known from what employees list on their profiles. 131 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name OCaml | 339 | 3.6% |
| Employees' profiles list OCaml | 8,997 | 96% |

## What size are the companies that use OCaml?

Companies with fewer than 50 employees are 1.3 times as common among OCaml users as on the typical tech page. 70 of its companies have more than 5,000 employees. These counts cover the 339 companies whose job posts name it.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 33% | 26% |
| 50 to 999 | 35% | 37% |
| 1,000 to 5,000 | 12% | 15% |
| Over 5,000 | 21% | 22% |

## Where are OCaml companies based?

Beyond the United States (49.6%), OCaml is unusually common in France, at 12% of its companies. Canada is less common than usual, at 2.5% against 3.8% on the typical tech page. These shares cover the 339 companies whose job posts name it.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 156 | 49.6% | 48% |
| France | 37 | 12% | 5% |
| United Kingdom | 29 | 9.2% | 6.3% |
| Germany | 12 | 3.8% | 4.4% |
| Singapore | 9 | 2.9% | 1.1% |
| Canada | 8 | 2.5% | 3.8% |

## Which teams work with OCaml?

OCaml turns up most in job posts for engineering, qla and technology teams.

| Team | Companies |
|---|---:|
| Engineering | 6 |
| Qla | 4 |
| Technology | 4 |
| Backend | 3 |
| Allocation | 2 |
| AWS utility computing (UC) | 2 |

## Which roles mention OCaml most?

Software Engineer is the role behind 44% of the job posts that mention OCaml. Embedded Engineer is second, at 6.4%.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Software Engineer | 44% | 103 | 29 | 20 |
| Embedded Engineer | 6.4% | 15 | 3 | 1 |
| Researcher | 5.5% | 13 | 3 | 2 |
| Applied Scientist | 5.1% | 12 | 1 | 11 |
| AI Engineer | 2.1% | 5 | 0 | 2 |
| Engineer | 2.1% | 5 | 2 | 0 |

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

16 companies with 50 or more employees picked up OCaml in their job posts from April to August 2026. Among the new enterprise companies, McKinsey & Company posted the most jobs naming it: 3.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [StorageMart](https://sumble.com/orgs/storagemart) | 2 |
| Commercial | [Magellium](https://sumble.com/orgs/magellium) | 2 |
| Commercial | [HyperionDev](https://sumble.com/orgs/hyperiondev) | 2 |
| Commercial | [AdaCore](https://sumble.com/orgs/adacore) | 2 |
| Commercial | [Arteris](https://sumble.com/orgs/arteris) | 1 |
| Enterprise | [McKinsey & Company](https://sumble.com/orgs/mckinsey-&-company) | 3 |
| Enterprise | [Stripe](https://sumble.com/orgs/stripe) | 2 |
| Enterprise | [The Walt Disney Company](https://sumble.com/orgs/walt-disney) | 1 |
| Enterprise | [SYSTRA](https://sumble.com/orgs/systra) | 1 |

Companies that named OCaml 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 OCaml companies use?

Compared with companies of the same size, OCaml companies stand out for using Haskell and F#. Erlang comes third, 98 times as common as usual, at 20%.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| Haskell | 161 | 70% | 0.18% | 398 times |
| F# | 64 | 28% | 0.17% | 163 times |
| Erlang | 45 | 20% | 0.2% | 98 times |
| Clojure | 42 | 18% | 0.2% | 91 times |
| LISP | 22 | 9.6% | 0.17% | 56 times |
| Solana | 14 | 6.1% | 0.11% | 55 times |
| Elixir | 40 | 17% | 0.35% | 51 times |
| Ethereum | 22 | 9.6% | 0.29% | 34 times |

Shares are out of the 229 companies whose job posts name OCaml, not counting firms whose job posts name almost every technology.

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

33 job posts naming OCaml describe Microservices Migration work, the most common theme after broad digital transformation. After that comes Generative AI, with 12.

| Project theme | Job posts |
|---|---:|
| Digital Transformation | 109 |
| Microservices Migration | 33 |
| Generative AI | 12 |
| Cloud Cost Optimization | 6 |

## 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.