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

Temper Digital
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In the age of AI, the true advantage lies not in technology but in people, their connections, and the knowledge they exchange. At Temper, we collaborate with innovation accelerators, government agencies, and forward-thinking companies to create and enhance AI-native digital platforms that simplify c
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
23% Custom Web Application Development
10% API Development & Integration
20% UX Research & Usability Testing
14% Product UX Strategy
AI Summary
“Temper Digital develops AI-native digital platforms and collaborative tools that enhance innovation, knowledge sharing, and community engagement, partnering with government and innovation organizations to drive meaningful change.”
Addepto
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Addepto is a prominent AI consulting firm that has been acknowledged by Forbes, Deloitte, and the Financial Times for its innovative AI and data-driven solutions. We focus on enhancing process automation and optimization for global enterprises through cutting-edge technologies. At Addepto, we do mor
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Warszawa, Masovian, Pl
Services Provided+1 Services
25% AI Strategy & Roadmap Consulting
20% Generative AI
20% LLM Integration & Prompt Engineering
25% Machine Learning Model Development
AI Summary
“Addepto is a leading AI consulting firm specializing in process automation, customized AI solutions, and innovative tools like ContextClue to drive efficiency and measurable client outcomes.”
CAPLAN ARTIFICIAL
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Caplan Artificial (Caplan AI) is an AI-focused company in the West Balkans that facilitates comprehensive business transformation through services such as AI consulting, implementation, predictive testing, Generative Engine Optimization (GEO), Answer Engine Optimization (AEO), and organization-wide
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Zenica, Ba
Services Provided
18% AI Strategy & Roadmap Consulting
22% LLM Integration & Prompt Engineering
10% Generative AI
50% Search Engine Optimization (SEO)
AI Summary
“Caplan Artificial is a pioneering AI consultancy in the Balkans, enabling business transformation across finance, telecom, and FMCG through AI integration, predictive testing, optimization, and training services.”
Emly Labs
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Emly Labs enables businesses to leverage advanced AI agents by ensuring that AI is accessible, cost-effective, and practical for areas such as sales, HR, operations, and more.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% AI Agent & Multi-Agent System Development
25% Generative AI
25% LLM Integration & Prompt Engineering
AI Summary
“Emly Labs provides accessible, cost-effective AI solutions that empower businesses across sales, HR, and operations, enhancing efficiency through advanced AI agents.”
The Intellify
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Intellify is a prominent company that leverages AI to create digital products, as well as offering AR/VR and digital transformation services. We focus on developing intelligent solutions across various domains, including AI, AR/VR, intelligent automation, mobile app development, enterprise software
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided+1 Services
50% Custom Web Application Development
15% AI Strategy & Roadmap Consulting
15% LLM Integration & Prompt Engineering
13% AI Agent & Multi-Agent System Development
AI Summary
“The Intellify delivers scalable AI-driven digital, AR/VR, and enterprise software solutions, leveraging advanced automation and cloud expertise to transform businesses across diverse industries.”
AurumNova
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Aurum Nova enables companies to enhance growth, improve efficiency, and secure a competitive advantage through specialized AI strategies and execution. Our knowledgeable and adaptable team, with extensive experience in artificial intelligence, assists a range of businesses—from cutting-edge startups
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided
50% AI Strategy & Roadmap Consulting
20% LLM Integration & Prompt Engineering
30% Generative AI
AI Summary
“Aurum Nova specializes in delivering tailored AI strategies and implementations, helping diverse companies enhance growth, efficiency, and competitive advantage through practical, transformative solutions.”
lenedo.tech
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We integrate no-code and low-code solutions with our product management skills to provide quick, high-quality outcomes.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% Mobile App Development (iOS & Android)
15% API Development & Integration
20% Custom AI Chatbot Development
30% LLM Integration & Prompt Engineering
AI Summary
“Lenedo.tech combines no-code and low-code technologies with expert product management to deliver efficient, high-quality solutions across diverse projects and industries.”
UniK SEO
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UniK SEO focuses on generating both organic and paid traffic from major search engines like Google, Bing, and Yahoo. Based in Portugal and the United Kingdom, our team of twenty skilled international professionals combines technology and creativity. We provide a wide array of services, including AI-
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Oeiras, Pt
Services Provided+3 Services
18% Search Engine Optimization (SEO)
12% Content Marketing Strategy
5% Email Marketing & Automation
15% Pay Per Click
AI Summary
“UniK SEO is an international digital marketing agency specializing in AI-driven SEO, PPC, content development, and social media, enhancing online visibility and ROI for diverse clients.”
I
intelz
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Intelza розробляє інтелектуального голосового бота Ельзу — віртуального співробітника для відділів продажу, підтримки та рекрутингу, який не втомлюється і завжди дотримується інструкцій. Спілкування максимально наближене до розмови з живою людиною: у 90% випадків абоненти не розуміють, що говорять з
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided
40% Custom AI Chatbot Development
35% Conversational AI & Voice Assistant Development
25% LLM Integration & Prompt Engineering
AI Summary
“Unable to generate a summary due to lack of specific information about Intelz's business activities or industry focus.”
AI Engineers Dev
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AI Engineers Dev is a comprehensive AI services company focused on full-spectrum AI application development and consulting. As a leader in global AI solutions, we pride ourselves on providing customized AI development and consulting services. Our expertise includes creating innovative web and mobile
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% AI Strategy & Roadmap Consulting
30% LLM Integration & Prompt Engineering
20% BI & Big Data Consulting & SI
20% Other IT Consulting and SI
AI Summary
“AI Engineers Dev delivers tailored AI solutions, developing innovative web, mobile, and specialized software with expert data scientists, enhancing accessibility, efficiency, and affordability in AI development.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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