--- title: "Which companies in United States use FastAPI?" description: "Jack & Jill, EXL, Klaviyo, Commure and more. 1,479 companies hiring in United States whose own job postings show they use FastAPI: 43 confirmed, 1,436 likely. U" canonical: https://jobspipe.dev/technologies/fastapi/us --- # Which companies in United States use FastAPI? > Jack & Jill, EXL, Klaviyo, Commure and more. 1,479 companies hiring in United States whose own job postings show they use FastAPI: 43 confirmed, 1,436 likely. Updated daily from live postings. **Canonical URL:** https://jobspipe.dev/technologies/fastapi/us 1,479 companies with postings in United States use FastAPI according to their own job postings: 43 confirmed and 1,436 likely. The 21 listed below are confirmed users with at least 2 postings and a verified website; the rest are counted here but not named. - **Confirmed companies:** 43 - **Likely companies:** 1,436 - **Category:** Web frameworks - **As of:** 25 Sep 2026 ## Companies using FastAPI | # | Company | Postings naming it | Last seen | |---|---|---|---| | 1 | [Jack & Jill](https://jobspipe.dev/hiring/jackandjill.ai) | 48 | 25 Sep 2026 | | 2 | [EXL](https://jobspipe.dev/hiring/exlservice.com) | 32 | 25 Sep 2026 | | 3 | [Klaviyo](https://jobspipe.dev/hiring/klaviyo.com) | 30 | 19 Sep 2026 | | 4 | [Commure](https://jobspipe.dev/hiring/commure.com) | 20 | 23 Sep 2026 | | 5 | [Jobright.ai](https://jobspipe.dev/hiring/jobright.ai) | 12 | 25 Sep 2026 | | 6 | [SeatGeek](https://jobspipe.dev/hiring/seatgeek.com) | 10 | 25 Sep 2026 | | 7 | [AKASA](https://jobspipe.dev/hiring/akasa.com) | 7 | 5 Sep 2026 | | 8 | [AZX](https://jobspipe.dev/hiring/azx.io) | 7 | 11 Sep 2026 | | 9 | [Function Health](https://jobspipe.dev/hiring/tap.bio) | 5 | 25 Sep 2026 | | 10 | [Mercury](https://jobspipe.dev/hiring/mercurybrasil.com) | 5 | 10 Sep 2026 | | 11 | [Arbital Health](https://jobspipe.dev/hiring/arbitalhealth.com) | 4 | 19 Aug 2026 | | 12 | [BillionToOne](https://jobspipe.dev/hiring/billiontoone.com) | 4 | 13 Sep 2026 | | 13 | [AceStack](https://jobspipe.dev/hiring/acestackllp.com) | 3 | 25 Sep 2026 | | 14 | [Basis Research Institute](https://jobspipe.dev/hiring/basis.ai) | 3 | 30 Jul 2026 | | 15 | [Bloomberg](https://jobspipe.dev/hiring/bloomberg.com) | 3 | 25 Sep 2026 | | 16 | [Probity Inc.](https://jobspipe.dev/hiring/probity.com) | 3 | 24 Sep 2026 | | 17 | [Re:Build Manufacturing](https://jobspipe.dev/hiring/rebuildmanufacturing.com) | 3 | 22 Sep 2026 | | 18 | [Salk Institute for Biological Studies](https://jobspipe.dev/hiring/salk.edu) | 3 | 25 Sep 2026 | | 19 | [Apptad](https://jobspipe.dev/hiring/apptad.com) | 2 | 24 Sep 2026 | | 20 | [GridCARE](https://jobspipe.dev/hiring/gridcare.ai) | 2 | 18 Sep 2026 | | 21 | [The Depository Trust & Clearing Corporation (DTCC)](https://jobspipe.dev/hiring/dtcc.com) | 2 | 24 Sep 2026 | ## By country - [India](https://jobspipe.dev/technologies/fastapi/in) - [United Kingdom](https://jobspipe.dev/technologies/fastapi/gb) - [Canada](https://jobspipe.dev/technologies/fastapi/ca) - [Brazil](https://jobspipe.dev/technologies/fastapi/br) - [Germany](https://jobspipe.dev/technologies/fastapi/de) - [France](https://jobspipe.dev/technologies/fastapi/fr) - [Singapore](https://jobspipe.dev/technologies/fastapi/sg) - [Mexico](https://jobspipe.dev/technologies/fastapi/mx) - [Japan](https://jobspipe.dev/technologies/fastapi/jp) Worldwide: [Which companies use FastAPI?](https://jobspipe.dev/technologies/fastapi) ## FAQ ### How many companies use FastAPI in United States? 1,479 companies in United States have job postings that show they use FastAPI, as of 25 Sep 2026. 43 are confirmed and 1,436 are likely. ### Which companies use FastAPI in United States? Jack & Jill, EXL, Klaviyo, Commure, Jobright.ai are among the confirmed FastAPI users with the most postings naming it in United States. The full list on this page names 21 companies. ### How does JobsPipe know a company uses FastAPI? From the company's own job postings. Each posting is read for the technologies it names, and every company and technology pair is graded: confirmed when two independent checks agree on FastAPI in at least one posting, likely when it is a stated requirement or appears in two separate postings. A single passing mention is not counted here. It is evidence of a team working with FastAPI, not a purchase record. ## Reproduce ```bash curl -X POST https://api.jobspipe.dev/v1/companies/search -H "Authorization: Bearer $JOBSPIPE_API_KEY" -H "Content-Type: application/json" -d '{"company_technology_slug_or":["fastapi"],"tier_min":"confirmed","company_country_code_or":["US"],"limit":25}' ``` --- AI agents: the full machine-readable index of this site is https://jobspipe.dev/llms.txt?src=md-twin - API quickstart, no-key sandbox (POST https://api.jobspipe.dev/v1/sandbox/jobs/search), MCP server, pricing. Free key: https://jobspipe.dev/signup