# Companies using Haystack

We found 1,757 companies that use Haystack. 1,069 of them name it in their own job posts, and the rest through employees' public profiles. 1,339 job posts named it from October 2025 to August 2026. It comes up most in AI Engineer job posts.

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

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

Accenture in India, Capital One and Boeing are among the companies with the most job posts naming Haystack. Accenture in India is the newest of the five companies in the table, with its first job post naming it in November 2025.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Accenture in India](https://sumble.com/orgs/accentureindia) | 78 | 1 | "Exposure to open-source AI and orchestration frameworks such as LangChain, LangGraph, LlamaIndex, Haystack, Semantic Kernel, MLflow, FastAPI, Docker and Kubernetes." (ai infrastructure architect, Oct 27, 2026) |
| [Capital One](https://sumble.com/orgs/capital-one) | 70 | 2 | "…commercial LLMs, and some experience in latest open source libraries such as LangChain, haystack and vector databases like open search, chroma and FAISS" (Lead Software Engineer, Sep 4, 2026) |
| [Boeing](https://sumble.com/orgs/boeing) | 57 | 3 | "Use of applications such as TCMax, GOLDEsp, WoW, MJDI, PUBLOG, Haystack, C17 Technical Orders and cargo tracking." (C17 Supply Chain Specialist, Jun 9, 2026) |
| [CACI International Inc](https://sumble.com/orgs/caci-international-1) | 55 | 1 | "…Guard/Commercial databases/systems as well as One Touch Supply LogiQuest or Haystack and FedMall" (Logistics Specialist/Ship Maintenance Support, Mar 3, 2026) |
| [Q.E.D. Systems, Inc.](https://sumble.com/orgs/q-e-d-systems) | 52 | 0 | "Conduct technical research using One Touch Support (OTS), FEDMALL and HAYSTACK" (Logistics Material Specialist, Aug 20, 2026) |

## Is hiring for Haystack growing?

Job posts mentioning Haystack went from 0.70 to 0.76 in every 10,000 job posts, comparing March to May with June to August 2026. One company accounts for most of that change.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 85 | 1,413,673 | 0.60 |
| Nov 2025 | 114 | 1,822,119 | 0.63 |
| Dec 2025 | 86 | 1,236,103 | 0.70 |
| Jan 2026 | 128 | 1,828,002 | 0.70 |
| Feb 2026 | 126 | 1,856,647 | 0.68 |
| Mar 2026 | 127 | 1,850,711 | 0.69 |
| Apr 2026 | 112 | 1,728,886 | 0.65 |
| May 2026 | 137 | 1,821,509 | 0.75 |
| Jun 2026 | 124 | 1,909,496 | 0.65 |
| Jul 2026 | 124 | 1,815,180 | 0.68 |
| Aug 2026 | 176 | 1,835,698 | 0.96 |

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

From June to August 2026, 84 companies posted their first job naming Haystack; 97 did from March to May. The 84 from June to August are 7.9% of all 1,069 companies whose job posts name it.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 97 |
| June to August 2026 | 84 |
| October 2025 to August 2026 | 354 |

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 Haystack?

1,069 companies name Haystack in job posts they wrote, and employees' profiles add 688 more. 86 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name Haystack | 1,069 | 61% |
| Employees' profiles list Haystack | 688 | 39% |

## What size are the companies that use Haystack?

No size of company stands out for Haystack. Companies with 50 to 999 employees make up the largest group, at 40%. 358 of its companies have more than 5,000 employees.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 25% | 22% |
| 50 to 999 | 40% | 38% |
| 1,000 to 5,000 | 15% | 17% |
| Over 5,000 | 20% | 23% |

## Where are Haystack companies based?

Beyond the United States (49%), Haystack is unusually common in Germany, at 6.3% of its companies. India is second, at 8.3%.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 833 | 49% | 43% |
| India | 141 | 8.3% | 6.9% |
| Germany | 106 | 6.3% | 4.4% |
| United Kingdom | 92 | 5.4% | 6.4% |
| France | 63 | 3.7% | 4.6% |
| Canada | 43 | 2.5% | 3.6% |

## Which teams work with Haystack?

No team dominates Haystack job posts. AI comes first, at 7 companies.

| Team | Companies |
|---|---:|
| AI | 7 |
| Generative AI | 6 |
| Data & AI | 5 |
| Data & analytics | 5 |
| Data science | 5 |
| Engineering | 5 |

## Which roles mention Haystack most?

AI Engineer is the role behind 42% of the job posts that mention Haystack. Software Engineer is second, at 8.7%.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| AI Engineer | 42% | 557 | 146 | 159 |
| Software Engineer | 8.7% | 116 | 34 | 16 |
| Data Scientist | 5.1% | 68 | 18 | 26 |
| Supply Chain | 4.8% | 64 | 13 | 29 |
| Skilled Trades | 2.7% | 36 | 10 | 11 |
| Machine Learning | 2.5% | 34 | 7 | 6 |

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

114 companies with 50 or more employees started naming Haystack in job posts between April and August 2026. 31 of them have more than 5,000 employees. Among the new commercial companies, R&K Enterprise Solutions, Inc. posted the most jobs naming it: 24.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [R&K Enterprise Solutions, Inc.](https://sumble.com/orgs/r&k-enterprise-solutions) | 24 |
| Commercial | [UsefulBI Corporation](https://sumble.com/orgs/usefulbi) | 5 |
| Commercial | [EPS Corporation](https://sumble.com/orgs/eps-772d9bf3) | 5 |
| Commercial | [techcarrot](https://sumble.com/orgs/techcarrot-fz) | 3 |
| Commercial | [5 Degrés](https://sumble.com/orgs/5degres) | 3 |
| Mid-market | [knowmad mood](https://sumble.com/orgs/knowmad-mood) | 4 |
| Mid-market | [Cloudera](https://sumble.com/orgs/cloudera) | 3 |
| Mid-market | [Fast Shop S/A](https://sumble.com/orgs/fast-shop) | 3 |
| Mid-market | [Arcfield](https://sumble.com/orgs/arcfield) | 3 |
| Mid-market | [conet](https://sumble.com/orgs/conet-technologies-holding) | 3 |
| Enterprise | [aramco](https://sumble.com/orgs/aramco-services) | 6 |
| Enterprise | [Zendesk](https://sumble.com/orgs/zendesk) | 5 |
| Enterprise | [BMW Group](https://sumble.com/orgs/bmw-group) | 3 |
| Enterprise | [Visa](https://sumble.com/orgs/visa) | 3 |
| Enterprise | [Delivery Hero](https://sumble.com/orgs/delivery-hero) | 3 |

Companies that named Haystack 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 Haystack companies use?

Cohere and LlamaIndex are the tools most closely tied to Haystack. Weaviate is 38 times as common as usual, at 34%.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| Cohere | 35 | 5.1% | 0.11% | 44 times |
| LlamaIndex | 367 | 53% | 1.3% | 40 times |
| Weaviate | 231 | 34% | 0.88% | 38 times |
| FAISS | 179 | 26% | 0.69% | 38 times |
| Milvus | 110 | 16% | 0.45% | 36 times |
| Mistral | 133 | 19% | 0.56% | 35 times |
| ChromaDB | 124 | 18% | 0.52% | 35 times |
| Qdrant | 93 | 14% | 0.43% | 32 times |

Shares are out of the 688 companies whose job posts name Haystack, not counting firms whose job posts name almost every technology.

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

Generative AI comes up most in job posts naming Haystack, in 1,445 of them. Broad digital transformation work shows up in 310 of its job posts; after that comes Cloud Cost Optimization, with 161.

| Project theme | Job posts |
|---|---:|
| Generative AI | 1,445 |
| Digital Transformation | 310 |
| Cloud Cost Optimization | 161 |
| Microservices Migration | 30 |

## 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.