# Companies using Fiddler

We found 9,240 companies that use Fiddler. 2,211 of them name it in their own job posts, and the rest through employees' public profiles. Its share of job posts is shrinking, though 1,480 job posts still named it from October 2025 to August 2026. QA teams are its most common home.

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

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

Microsoft, EPAM Systems and Cognizant mention Fiddler in the most job posts. Of the five companies in the table, Microsoft has the most employees who list it on their profiles: 225.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Microsoft](https://sumble.com/orgs/microsoft) | 299 | 225 | "Familiarity with tools: PowerShell, Netmon, Fiddler, CLI (command-line interfaces)" (Technical Support Engineer - Azure Cloud, Sep 17, 2026) |
| [EPAM Systems](https://sumble.com/orgs/epam-systems) | 290 | 216 | "Experience with sniffing tools (Wireshark, Charles, Fiddler)" (Senior Performance Analyst, Sep 7, 2026) |
| [Cognizant](https://sumble.com/orgs/cognizant-technology-solutions) | 144 | 174 | "Utilize Fiddler and similar tools to capture and analyze HTTP traffic ensuring accurate test scripting protocol handling and defect triage." (Performance Analyst, Oct 22, 2026) |
| [Docusign](https://sumble.com/orgs/docusign) | 131 | 6 | "Experience with system monitoring (Prometheus, Grafana, Datadog) and ML monitoring frameworks (Evidently, Arize, or Fiddler)" (Machine Learning Engineer, Oct 23, 2026) |
| [Luxoft](https://sumble.com/orgs/luxoft) | 122 | 12 | "Dev Tool: Fiddler, Postman and Swagger" (Software Support Engineer, Mar 22, 2026) |

## Is hiring for Fiddler growing?

Job posts mentioning Fiddler went from 0.78 to 0.66 in every 10,000 job posts, comparing March to May with June to August 2026. Its busiest month was November 2025, at 0.94.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 98 | 1,413,673 | 0.69 |
| Nov 2025 | 171 | 1,822,119 | 0.94 |
| Dec 2025 | 105 | 1,236,103 | 0.85 |
| Jan 2026 | 158 | 1,828,002 | 0.86 |
| Feb 2026 | 161 | 1,856,647 | 0.87 |
| Mar 2026 | 161 | 1,850,711 | 0.87 |
| Apr 2026 | 129 | 1,728,886 | 0.75 |
| May 2026 | 130 | 1,821,509 | 0.71 |
| Jun 2026 | 142 | 1,909,496 | 0.74 |
| Jul 2026 | 113 | 1,815,180 | 0.62 |
| Aug 2026 | 112 | 1,835,698 | 0.61 |

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

In the three months to August 2026, 56 companies posted about Fiddler for the first time. From March to May, 65 did. From October 2025 to August 2026, 202 companies named it in a job post for the first time.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 65 |
| June to August 2026 | 56 |
| October 2025 to August 2026 | 202 |

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 Fiddler?

Most of these companies come from employees' profiles: 76% have no job post naming Fiddler. 2,211 name it in their own job posts.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name Fiddler | 2,211 | 24% |
| Employees' profiles list Fiddler | 7,029 | 76% |

## What size are the companies that use Fiddler?

The largest group of Fiddler users is companies with 50 to 999 employees (46%), more than on the typical tech page. The second-largest group is companies with fewer than 50 employees, at 20%.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 20% | 22% |
| 50 to 999 | 46% | 38% |
| 1,000 to 5,000 | 18% | 17% |
| Over 5,000 | 15% | 23% |

## Where are Fiddler companies based?

The United States and the United Kingdom have the most Fiddler companies, at 46% and 6.6%. Germany is less common than usual, at 2.4% against 4.4% on the typical tech page.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 4,092 | 46% | 43% |
| United Kingdom | 577 | 6.6% | 6.4% |
| India | 476 | 5.4% | 6.9% |
| Canada | 363 | 4.1% | 3.6% |
| Germany | 213 | 2.4% | 4.4% |
| Israel | 199 | 2.3% | 0.36% |

## Which teams work with Fiddler?

At 51 companies, the team named in Fiddler job posts is QA, at least twice the next. IT and technology teams come next, at 21 and 18 companies.

| Team | Companies |
|---|---:|
| QA | 51 |
| IT | 21 |
| Technology | 18 |
| Engineering | 12 |
| Development | 11 |
| R&D | 10 |

## Which roles mention Fiddler most?

Fiddler shows up across many roles. The top one, Software Development Engineer in Test, has 26% of the job posts. The top four roles cover 49% of these job posts.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Software Development Engineer in Test | 26% | 387 | 100 | 75 |
| Software Engineer | 11% | 158 | 47 | 46 |
| Customer Engineer | 7% | 104 | 27 | 28 |
| IT Support | 4.9% | 72 | 24 | 19 |
| Test Engineer | 3.3% | 49 | 16 | 12 |
| Quality Engineer | 3.2% | 47 | 19 | 7 |

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

From April to August 2026, 77 companies with 50 or more employees posted their first job naming Fiddler: 45 commercial, 19 mid-market and 13 enterprise. Among the new commercial companies, OASYS, INC. posted the most jobs naming it: 8.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [OASYS, INC.](https://sumble.com/orgs/oasys) | 8 |
| Commercial | [Catalina USA](https://sumble.com/orgs/catalina) | 4 |
| Commercial | [SHOPLINE](https://sumble.com/orgs/shopline) | 3 |
| Commercial | [NeST Digital](https://sumble.com/orgs/nest-digital) | 2 |
| Commercial | [TradeStation](https://sumble.com/orgs/tradestation) | 2 |
| Mid-market | [Mastek](https://sumble.com/orgs/mastek) | 3 |
| Mid-market | [Box](https://sumble.com/orgs/box) | 3 |
| Mid-market | [Comarch](https://sumble.com/orgs/comarch) | 2 |
| Mid-market | [Octave](https://sumble.com/orgs/octaveintelligence) | 2 |
| Mid-market | [10Pearls](https://sumble.com/orgs/10pearls) | 2 |
| Enterprise | [Renesas Electronics](https://sumble.com/orgs/renesas) | 5 |
| Enterprise | [Pearson](https://sumble.com/orgs/pearson) | 3 |
| Enterprise | [Hitss Brasil](https://sumble.com/orgs/global-hitss) | 3 |
| Enterprise | [Dayforce](https://sumble.com/orgs/dayforce) | 3 |
| Enterprise | [Ecolab](https://sumble.com/orgs/ecolab) | 2 |

Companies that named Fiddler 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 Fiddler companies use?

Chrome DevTools, Locust and XCUITest show up far more often at Fiddler companies than at companies of the same size. Couchbase comes fourth, 13 times as common as usual, at 7.1%.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| Chrome DevTools | 111 | 8.4% | 0.39% | 21 times |
| Locust | 103 | 7.8% | 0.57% | 14 times |
| XCUITest | 83 | 6.3% | 0.49% | 13 times |
| Couchbase | 94 | 7.1% | 0.56% | 13 times |
| Protractor | 90 | 6.8% | 0.56% | 12 times |
| Puppeteer | 68 | 5.1% | 0.43% | 12 times |
| TeamCity | 228 | 17% | 1.5% | 12 times |
| MobX | 109 | 8.2% | 0.72% | 11 times |

Shares are out of the 1,327 companies whose job posts name Fiddler, not counting firms whose job posts name almost every technology.

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

Apart from broad digital transformation work, Microservices Migration comes up most in job posts naming Fiddler, in 60 of them. After that comes Data Infrastructure Migration, with 56.

| Project theme | Job posts |
|---|---:|
| Digital Transformation | 404 |
| Microservices Migration | 60 |
| Data Infrastructure Migration | 56 |
| Cloud Cost Optimization | 46 |

## 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.