We found 4,414 companies that use LangSmith. 2,230 of them name it in their own job posts, and the rest through employees' public profiles. Its share of job posts jumped in the three months to August 2026, with 3,718 job posts naming it from October 2025 to August 2026. AI Engineer roles mention it most.
Which companies name LangSmith in the most job posts?
Deloitte, EPAM Systems and LangChain are among the companies with the most job posts naming LangSmith. Deloitte has named it in job posts the longest of the five companies in the table, since March 2024.
CompanyPostsPeopleRecent job post
DeloitteProfessional Services · first seen Mar 202413448
"…Java, Rust, SQL/NoSQL, PyTorch , TensorFlow, LangChain , LangGraph , LangSmith , LangFuse , Terraform , as well as unit, integration, and…"Applied AI Platforms Engineer III - SAP Datasphere/BDC, Nov 7, 2026
EPAM SystemsProfessional Services · first seen May 202411312
"AI Observability & Evaluation: Familiarity with AI evaluation tooling or real-time APM platforms (e.g., LangSmith, Langfuse, Arize)"Lead Python AI Engineer, Oct 24, 2026
LangChainInformation · first seen Feb 20258419
"Administer LangSmith, our product, and use APIs to automate admin work"IT Systems Administrator, Oct 22, 2026
Booz Allen HamiltonProfessional Services · first seen Mar 2026623
"…and building observation layers for stakeholders, including Grafana, Langfuse, LangSmith, or Phoenix"Agentic AI Engineer, Nov 6, 2026
GEICOFinance and Insurance · first seen Aug 2025605
"Observability, evaluation, and tracing for GenAI systems (e.g., LangSmith, Arize Phoenix, Weights & Biases, OpenTelemetry)"Distinguished Engineer, AI Applications, Sep 7, 2026
Employers mentioned LangSmith 1.4 times as often from June to August 2026 as from March to May. 2.8 in every 10,000 job posts named it, against 2.0 before. June 2026 was its highest month since October 2025, at 3.0.
Show the data
Month
Job posts naming LangSmith
All job posts
Per 10,000
Oct 2025
140
1,413,673
0.99
Nov 2025
199
1,822,119
1.1
Dec 2025
140
1,236,103
1.1
Jan 2026
241
1,828,002
1.3
Feb 2026
327
1,856,647
1.8
Mar 2026
298
1,850,711
1.6
Apr 2026
338
1,728,886
2.0
May 2026
458
1,821,509
2.5
Jun 2026
568
1,909,496
3.0
Jul 2026
491
1,815,180
2.7
Aug 2026
518
1,835,698
2.8
How many companies named LangSmith in a job post for the first time in recent months?
From June to August 2026, 460 companies posted their first job naming LangSmith; 378 did from March to May. From October 2025 to August 2026, 1,220 companies named it in a job post for the first time.
March to May 2026378
June to August 2026460
October 2025 to August 20261,220
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 LangSmith?
2,230 of the 4,414 companies name LangSmith in their own job posts. The other 2,184 show up because employees list it on their profiles. 350 show up in both job posts and employees' profiles.
How we knowCompaniesShare
Job posts name LangSmith
2,23051%
Employees' profiles list LangSmith
2,18449%
4,414 companies. Each is counted once, under the strongest evidence we have for it.
What size are the companies that use LangSmith?
The largest group of LangSmith users is companies with 50 to 999 employees (40%), more than on the typical tech page. 1,210 of its companies have fewer than 50 employees.
Share of its companies
Typical tech page
ShareTypical
Under 50 employees
27%22%
50 to 999
40%38%
1,000 to 5,000
16%17%
Over 5,000
17%23%
Where are LangSmith companies based?
The United States has the most LangSmith companies (45%), but Brazil stands out: 4% of them, against 2.8% on the typical tech page. India is second, at 9.7%.
ShareTypical
United States
45%43%
India
9.7%6.9%
United Kingdom
5.6%6.4%
Brazil
4%2.8%
Germany
3.5%4.4%
Canada
3.2%3.6%
Companies in 93 countries and territories. Shares are of companies with a known headquarters country.
Show the data
Country
Companies
Share
Typical tech page
United States
1,914
45%
43%
India
409
9.7%
6.9%
United Kingdom
235
5.6%
6.4%
Brazil
169
4%
2.8%
Germany
148
3.5%
4.4%
Canada
137
3.2%
3.6%
Which teams work with LangSmith?
LangSmith work is spread across teams. AI leads, at 42 companies. AI engineering teams are second, at 27 companies, and engineering teams third, at 19.
TeamCompanies
AI
42
AI engineering
27
Engineering
19
AI platform
18
Data science
16
Platform
8
What else do LangSmith companies use?
Arize, Promptfoo and Langfuse show up far more often at LangSmith companies than at companies of the same size. Pgvector is 40 times as common as usual, at 26%.
Share of the 1,577 LangSmith companies counted here whose job posts also name the tool
Typical for companies the same size
Which companies started naming LangSmith in job posts recently?
Between April and August 2026, LangSmith appeared for the first time in job posts at 540 companies: 296 commercial, 120 mid-market and 124 enterprise. Kyndryl leads the new enterprise companies, with 15 job posts from April to August.
Companies that named LangSmith 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.
Which roles mention LangSmith most?
AI Engineer is the most common role, in 44% of job posts naming LangSmith. AI Engineer posts naming it numbered 453 from March to May 2026 and 689 from June to August.
RoleSharePosts
AI Engineer
44%1,637
Software Engineer
11%400
Machine Learning
5.1%189
Software Development Engineer in Test
3.3%122
Data Scientist
2.6%98
Forward Deployed Engineer
1.7%62
Show the data
Role
Share
Oct 2025 to Aug 2026
Mar to May 2026
Jun to Aug 2026
AI Engineer
44%
1,637
453
689
Software Engineer
11%
400
123
172
Machine Learning
5.1%
189
62
54
Software Development Engineer in Test
3.3%
122
34
53
Data Scientist
2.6%
98
26
27
Forward Deployed Engineer
1.7%
62
11
38
Which project themes come up in LangSmith job posts?
Teams hiring for LangSmith most often mention Generative AI, in 3,433 job posts. Apart from broad digital transformation work, Cloud Cost Optimization comes next, with 467.
Project themeJob posts
Generative AI3,433
Digital Transformation738
Cloud Cost Optimization467
Microservices Migration87
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.
