Top LLM Integration & Prompt Engineering Companies

LLM integration and prompt engineering is the work of putting a large language model, such as GPT, Claude, Gemini or Llama, inside an existing product or workflow so that it answers correctly from your own data. The firms build retrieval-augmented generation (RAG) over documents and databases, write and version the prompts, connect the model to tools and APIs, and set up evaluations and guardrails that catch wrong or unsafe output. Companies hire them when a chatbot demo works but fails on real questions, or when support, sales or operations teams want AI features in tools they already use.

Compare the firms here on shipped production features rather than demos, how they measure answer quality, and how they handle data privacy.

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2,741 Companies

List of the Best LLM Integration & Prompt Engineering Agencies

Vextar
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Vextar is an agile software development company with a wealth of experience in providing innovative and top-notch technology solutions. We focus on developing mobile applications, web platforms, and bespoke software designed to cater to various client requirements. Our goal is to turn ideas into eff
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Asuncion, Py
Services Provided+5 Services
11% Custom Web Application Development
9% Mobile App Development (iOS & Android)
4% LLM Integration & Prompt Engineering
4% Custom AI Chatbot Development
AI Summary
“Vextar is an agile software development firm specializing in mobile apps, web platforms, and custom software, delivering innovative digital solutions to drive business growth and innovation.”
INTECH Creative Services Pvt Ltd
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INTECH is a technology partner with over 21 years of experience, boasting a team of more than 700 engineers and delivery centers situated in India, the USA, UAE, and Hong Kong. We focus on implementing Odoo and Oracle ERP solutions, providing AI/ML services, and facilitating digital transformation f
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Gandhinagar, Gujarat, In
Services Provided+17 Services
6% Custom Web Application Development
5% API Development & Integration
4% Mobile App Development (iOS & Android)
8% ERP & CRM Development
AI Summary
“INTECH Creative Services Pvt Ltd delivers comprehensive technology solutions including ERP implementation, AI-driven automation, managed IT services, and strategic consulting, driving digital transformation across diverse industries globally.”
ISCL
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ISCL (LINAR) est une agence digitale spécialisée dans la création de solutions professionnelles automatisées, l'intégration d'intelligence artificielle et le développement web sur mesure. Nous aidons les entreprises à améliorer leur efficacité grâce à des systèmes intelligents et connectés, parfaite
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
15% API Development & Integration
3% Mobile App Development (iOS & Android)
15% Custom Web Application Development
10% Custom AI Chatbot Development
AI Summary
“ISCL (LINAR) is a French digital agency specializing in custom web development, AI integration, and business process automation, enhancing operational efficiency for SMEs and startups.”
Momenttext AI
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MomentText is a consulting company with expertise in leveraging AI and Machine Learning to address business challenges.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
New Delhi, Delhi, In
Services Provided+4 Services
20% Custom Web Application Development
14% Legacy System Modernization
5% Other IT Consulting and SI
3% IT Staff Augmentation
AI Summary
“MomentText is a consulting firm specializing in AI and machine learning solutions to help businesses overcome challenges and drive innovation across various industries.”
Optek Solutions
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In the current landscape, digital transformation is increasingly becoming standard. OPTek Solutions is committed to delivering innovative business technology that enables organizations to manage various product developments, engage customers, and implement tech-based services efficiently and afforda
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
18% AI Strategy & Roadmap Consulting
13% Custom AI Chatbot Development
12% Machine Learning Model Development
7% LLM Integration & Prompt Engineering
AI Summary
“OPTek Solutions delivers innovative, accessible digital technologies in the Philippines, enabling efficient product management, customer engagement, and sustainable digital transformation across diverse sectors.”
DeLabs
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Located in Prague's innovation center, DeLabs empowers businesses and startups to become market leaders by integrating advanced technology with strategic design. Our achievements are reflected in the improved valuations of more than 40 startups, highlighting our dedication to turning ideas into real
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Prague, Cz
Services Provided+11 Services
22% Custom Web Application Development
12% Mobile App Development (iOS & Android)
7% LLM Integration & Prompt Engineering
3% Workflow Automation (Zapier / Make / n8n)
AI Summary
“DeLabs, based in Prague, partners with startups and businesses to deliver strategic, technology-driven digital solutions, enhancing valuations and transforming ideas into market-leading realities.”
Bizvinc
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Creativity – Develop intelligent solutions that propel businesses ahead. Honesty – Conduct actions with transparency and accountability. Client-Centric – Prioritize customer success in all decisions. Teamwork – Collaborate to achieve better results. Quality – Provide superior outcomes while striving
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Karachi, Sindh, Pk
Services Provided+8 Services
6% AI Strategy & Roadmap Consulting
5% LLM Integration & Prompt Engineering
5% Custom AI Chatbot Development
5% Machine Learning Model Development
AI Summary
“Bizvinc delivers intelligent, client-focused solutions emphasizing creativity, honesty, teamwork, and quality, continuously evolving to drive business success with transparency and collaboration.”
Arya57 LLC
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We provide state-of-the-art application development services that enable you to gain a significant edge over your competitors. By leveraging advanced technologies such as Artificial Intelligence, Natural Language Processing, Deep Learning, Data Science, and cognitive technologies, we are developing
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Paramus, New Jersey, Us
Services Provided+7 Services
15% Machine Learning Model Development
8% Custom AI Chatbot Development
3% LLM Integration & Prompt Engineering
12% Custom Web Application Development
AI Summary
“Arya57 LLC offers advanced application development integrating AI, NLP, and data science across platforms like AWS, Azure, and Google, delivering custom software, modernized apps, and AI-enhanced solutions.”
Prosperaize
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Dušan Stamenković is the creator of Prosperaize. He has led research efforts at Google, managed consultancy and project teams within the Big Four firms, developed Data Science, Machine Learning, and AI solutions for large global organizations, and designed ML, data, and AI systems for Fortune 500 co
Highlights
$25,000+
Min Project Size
2-9
Employees
Services Provided+4 Services
12% AI Strategy & Roadmap Consulting
5% LLM Integration & Prompt Engineering
4% Custom AI Chatbot Development
5% Machine Learning Model Development
AI Summary
“Prosperaize, led by Dušan Stamenković, applies comprehensive AI, data science, and machine learning expertise to optimize business operations by prioritizing profitability and risk assessment.”
Devlixor Technologies
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Devlixor Technologies is a premier global partner in Digital Engineering and Growth, focused on creating high-performance ecosystems for modern businesses. We connect intricate software engineering with smart workflow orchestration, delivering the technical agility necessary for excelling in the com
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Dubai, Dubayy, Ae
Services Provided+7 Services
9% Custom Web Application Development
9% SaaS Product Development
5% Backend Development
2% Frontend Development
AI Summary
“Devlixor Technologies delivers integrated digital engineering, AI-driven workflow automation, technical SEO, and elite global talent to empower scalable, high-performance business solutions worldwide.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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