Top 10 best LangChain development companies (2026)

LangChain is the most widely used open-source framework for building applications on large language models, and LangGraph, its agent runtime, is where most production agent work now happens. Choosing a development partner for it comes down to one question: has the firm shipped LangChain systems that run in production, and can it show you where?

This ranking compares ten firms that build with LangChain and LangGraph. We checked each one against its own website, LangChain's official Partner Network and public records of acquisitions, and replaced every firm from the previous edition that had been acquired or had no LangChain work to show.

What LangChain development covers #

LangChain gives developers building blocks for LLM applications: model interfaces, retrieval for RAG, tools, memory and output parsing. LangGraph adds stateful, multi-step agents with checkpoints and human approval steps. LangSmith handles tracing and evaluation. A LangChain development company designs the retrieval and agent logic on top of these pieces, integrates it with the client's systems and data, and sets up the evaluation and monitoring that keep it reliable after launch.

The framework is rarely the hard part. Most of the effort goes into data quality, retrieval design, tool permissions and evaluation, which is why public case studies matter more than a list of supported libraries.

How we ranked LangChain development companies #

Each firm was scored on five weighted criteria:

• LangChain ecosystem standing (membership of the LangChain Partner Network, contributions to LangChain repositories, recognition by LangChain) [weighted 25%]
• Production case studies (named, public projects built with LangChain or LangGraph) [weighted 25%]
• Engineering depth (size and focus of the AI engineering team) [weighted 20%]
• Services offered (end-to-end delivery from scoping to monitoring, or partial services) [weighted 15%]
• Thought leadership (publications, open-source work and talks on LLM engineering) [weighted 15%]

Note: figures for every firm except Vstorm come from public sources only: the company's own website, LangChain's Partner Network page and published acquisition announcements, checked in September 2026. Where a firm does not publish a figure, we say so rather than estimate it.

Disclosure: Vstorm publishes this ranking and is one of the ten firms in it. We scored our own entry against the same weighted criteria, but our figures come from internal records, while every other firm is assessed on public data only. Weigh the Vstorm entry with that in mind.

Top LangChain development companies: the shortlist #

• Vstorm – agentic AI engineering company building LangChain, LangGraph and LlamaIndex systems for production
• Focused – LangChain Partner Network member with named LangGraph and LangSmith case studies
• deepsense.ai – early LangChain partner (2023) and contributor to the LangChain codebase
• Shorthills AI – generative AI and data engineering firm named among LangChain's top contributors
• Lightci – LangChain Partner Network member serving private equity firms and their portfolio companies
• Tenex – LangChain Partner Network member delivering AI engineering engagements
• InData Labs – data science and AI firm using LangChain in its LLM services
• Bluebash – software and AI development firm with dedicated LangChain development services
• 10Clouds – Warsaw software house with a dedicated LangChain development practice
• ActiveWizards – data and AI engineering firm with LangChain and LangGraph engineering services

1. Vstorm #

LangChain systems built for production and handed over to the client's team.

Vstorm is an agentic AI engineering company and the first AI consultancy in the Agentic AI Foundation, as a Silver Member. We build RAG systems and agents with LangChain, LangGraph and LlamaIndex, and with Pydantic AI when the project calls for it, so the framework follows the problem rather than the other way round. The same team scopes, builds, deploys and monitors each system, then trains the client's engineers to run it.

Location and development center: Wroclaw, Poland

Founded: 2017

Number of AI engineers: 25+ AI engineers

Best for: Companies that need a LangChain or LangGraph system running in production, integrated with their own data and owned by their team after handover

Highlights and case studies:

Automated data scraping platform for Rotwand, built with LangChain and LlamaIndex, extracts structured data from thousands of news sources and processes more than 100,000 articles a week.

Collaborative conversational AI assistant, an open-source platform built with LangChain for a California-based web annotation startup, lets several users work with an LLM in the same session in real time.

RAG email response automation for Senetic answers customer emails in their own language across 151 countries.

More on how we approach the framework: our LangChain development services.

Strengths

Named LangChain work in production, end-to-end delivery and our own open-source agent tooling. Focused, a LangChain Partner Network member, ranks Vstorm fourth in its own list of LangChain agencies.

Limitations

Vstorm is not a member of the LangChain Partner Network, and because we work across several frameworks, teams that want a LangChain-only specialist may prefer a partner from the network.

2. Focused #

The most visible LangChain partner among delivery firms.

Focused, formerly Focused Labs, is a US software consultancy and a member of LangChain's Partner Network, with a strategic partnership with LangChain announced in February 2024. Its LangChain page carries a quote from LangChain CEO Harrison Chase and describes LangGraph and LangSmith projects, including an order orchestration system with more than 12 agents in production and a claims review workflow run across more than 50,000 invoices.

Location: Chicago, with offices in Denver and London

Team: About 60 engineers, per the company

Best for: Companies that want a partner closely tied to LangChain's own roadmap and tooling

Strengths

Official partner status, named production agents and hands-on use of LangGraph and LangSmith.

Limitations

Its public work centres on LangChain's own stack, so it is a weaker fit for teams that want a framework-agnostic build.

3. deepsense.ai #

An early LangChain partner with real commits in the codebase.

deepsense.ai is a Polish AI services company. In October 2023 LangChain announced it as one of its first four partners. deepsense.ai reported 22 pull requests and 264 commits to LangChain repositories and early access to LangSmith while it was in closed beta. The firm is not listed on LangChain's current Partner Network page.

Location: Warsaw, with an office in Palo Alto

Founded: 2014

Team: 120 AI experts, per the company

Best for: Teams that value a partner with direct contributions to the LangChain codebase

Strengths

Code-level LangChain experience and a long record in machine learning projects.

Limitations

Its LangChain partnership dates from 2023 and does not appear in the current partner directory.

4. Shorthills AI #

Open-source LangChain contributions at scale.

Shorthills AI is a generative AI and data engineering services firm. LangChain named it among its top contributors in the post marking the framework's first anniversary in 2023, and dozens of contributor accounts in the LangChain repositories carry the Shorthills name.

Location: Short Hills, New Jersey, with offices in Ottawa, Australia, Gurugram and Noida

Founded: 2018

Team: 300+ engineers, per the company

Best for: Companies that need a large team for data engineering and LLM work alongside LangChain development

Strengths

Recognition by LangChain itself and a large engineering bench.

Limitations

Its public material shows little detail about named LangChain projects for clients.

5. Lightci #

A LangChain partner built around private equity.

Lightci is a member of LangChain's Partner Network and an Anthropic Select Services Partner. It names LangChain as its agent infrastructure partner and lists Pendo, Vista Equity Partners and Alpha School among its clients.

Location: Toronto, New York and London

Founded: 2021

Best for: Private equity firms and their portfolio companies rolling out AI agents

Strengths

Official partner status and work with well-known clients.

Limitations

Its focus on private equity makes it a narrower fit for other buyers, and its case studies do not say which projects used LangChain.

6. Tenex #

A LangChain partner from the media world.

Tenex is an AI engineering firm co-founded by Alex Lieberman, co-founder of Morning Brew. It is a member of LangChain's Partner Network and lists LangChain among its partners.

Location: Not published

Best for: Companies that want a LangChain partner and are comfortable assessing it in a direct conversation

Strengths

Official partner status.

Limitations

We found no public LangChain case study, and the firm does not publish its location, founding year or team size.

7. InData Labs #

LangChain inside a broader data science practice.

InData Labs is a data science and AI company. LangChain appears in the technology stack of its LLM development services, alongside its work on machine learning models and predictive analytics.

Location: Cyprus, with offices in the USA and Lithuania

Founded: 2014

Team: 80+, per the company

Best for: Companies that need LLM work as part of a wider data science engagement

Strengths

Long experience in data science and analytics.

Limitations

LangChain is one tool in its stack, and we found no public LangChain case study.

8. Bluebash #

Dedicated LangChain development services.

Bluebash is a software and AI development company working mainly in healthcare and e-commerce. It runs dedicated LangChain development and LangChain developer hiring services.

Location: Mohali, India, with offices in Canada and the USA

Founded: 2018

Team: About 80 people (75+ developers and 8+ designers, per the company)

Best for: Companies that want to hire LangChain developers into their own team

Strengths

Flexible engagement through dedicated developers.

Limitations

Its LangChain evidence is limited to service pages, with no public LangChain case study.

9. 10Clouds #

A European software house with a LangChain practice.

10Clouds is a Warsaw software house with dedicated LangChain development and technology pages. Its published LangChain examples are internal products, such as its own AI assistant and the 10Minions coding tool.

Location: Warsaw, Poland

Best for: Companies that want LangChain work delivered by a general software house in Europe

Strengths

Broad software delivery capacity around the AI work.

Limitations

Its public LangChain examples are internal, with no client case study.

10. ActiveWizards #

LangChain and LangGraph engineering services.

ActiveWizards is a data and AI engineering firm that offers dedicated LangChain and LangGraph engineering services.

Founded: 2010

Best for: Companies that need help with a specific LangChain or LangGraph engineering problem

Strengths

Explicit LangGraph services.

Limitations

Its case studies cover internal agents only, and it does not publish its location or team size.

Which LangChain development company should you choose? #

The firms in this list fall into three groups:

• LangChain Partner Network members: Focused, Lightci and Tenex hold official partner status, and Focused backs it with named production case studies.
• Engineering firms with production LangChain work: Vstorm, deepsense.ai and Shorthills AI combine LangChain experience with their own engineering and open-source record.
• Development firms with LangChain services: InData Labs, Bluebash, 10Clouds and ActiveWizards offer LangChain as part of a wider service range.

Ask any candidate for a LangChain or LangGraph system it has running in production today, how it evaluates that system and who owns the code after handover. Those three answers separate firms that have shipped from firms that list the framework on a services page.

Vstorm builds LangChain and LangGraph systems that run in production and leaves your team owning and operating them.