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

No-code SimpleDev
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At SimpleDev, a committed software development firm, our primary goal is to develop and oversee innovative technological solutions. Our portfolio demonstrates our dedication, featuring a range of successful projects accomplished worldwide, including in the United States, Spain, Ireland, Germany, and
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% Custom Web Application Development
25% AI Strategy & Roadmap Consulting
25% LLM Integration & Prompt Engineering
AI Summary
“SimpleDev is a global software development company creating innovative technological solutions across various industries, leveraging expert teams and advanced tools for efficient, high-quality delivery.”
Lomray Software
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Lomray Software is a custom web and mobile development company with locations in Florida, USA, and Warsaw, Poland, which blends the convenience of US business with exceptional European engineering. We specialize in three main areas: - Custom web application development - Cross-platform mobile app
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided+2 Services
23% Custom Web Application Development
10% Mobile App Development (iOS & Android)
17% Conversational AI & Voice Assistant Development
17% LLM Integration & Prompt Engineering
AI Summary
“Lomray Software offers custom web and cross-platform mobile app development with UI/UX design, serving diverse sectors including fintech, healthcare, and e-learning across multiple regions.”
DEHA GLOBAL PTE. LTD.
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DEHA GLOBAL, based in Singapore, is a technology consulting and delivery partner that focuses on AI, Cloud Engineering, and Rapid Product Development for businesses throughout APAC and Australia. We assist organizations in speeding up their digital transformations with high-quality engineering, cost
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Singapore, Sg
Services Provided+3 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
5% E-Commerce Development
18% Generative AI
AI Summary
“DEHA GLOBAL offers AI, cloud engineering, and rapid product development services across APAC and Australia, partnering to accelerate digital transformation with expertise and reliable delivery.”
GenStack AI
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GenStack AI is at the forefront of integrating advanced Artificial Intelligence (AI) technologies to transform businesses. We offer a wide range of services, including AI Solutions, Large Language Models (LLM), ChatGPT Integration, AI Automation, AI Website Development, AI Software as a Service (Saa
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
20% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% LLM Integration & Prompt Engineering
18% Custom AI Chatbot Development
AI Summary
“GenStack AI specializes in comprehensive AI services including automation, SaaS, LLM, and app development, delivering customized, scalable solutions to enhance business efficiency and growth.”
Globalcore Tech
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Globalcore Tech: Designing Scalable Modular Ecosystems. In a time when expansion reveals structural challenges, many businesses find their progress hindered by technical debt. At Globalcore Tech, we connect ambitious visions with high-performance delivery. As a specialized engineering firm, we focus
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
25% Custom Web Application Development
18% Backend Development
7% Frontend Development
10% Machine Learning Model Development
AI Summary
“Globalcore Tech specializes in scalable, modular cloud-native ecosystems, accelerating digital product delivery with zero-technical-debt architecture and advanced AI, infrastructure, and UX technologies.”
Supriba Technologies
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We create and develop advanced AI and user interface solutions that transform the ways contemporary companies grow and thrive in a digital-centric environment.
Highlights
2-9
Employees
Madeenaguda, Telangana, In
Services Provided+1 Services
20% AI Strategy & Roadmap Consulting
20% Generative AI
15% AI Agent & Multi-Agent System Development
25% LLM Integration & Prompt Engineering
AI Summary
“Supriba Technologies specializes in developing advanced AI and user interface solutions, empowering businesses to enhance growth and adapt effectively in a digitally-driven market environment.”
AI First Startup
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AI First is a global platform dedicated to AI services, with a straightforward goal: making AI accessible to everyone. We assist startups, businesses, and investors in creating more intelligent systems by connecting them with top-tier AI professionals. Unlike typical freelance platforms, AI First fe
Highlights
10-49
Employees
St. Petersburg, Florida, Us
Services Provided+1 Services
20% AI Strategy & Roadmap Consulting
25% LLM Integration & Prompt Engineering
20% Custom AI Chatbot Development
20% Machine Learning Model Development
AI Summary
“AI First is a global platform connecting businesses and individuals with expert AI professionals, offering comprehensive AI development, automation, and career support services worldwide.”
Skim AI Technologies Inc
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Founded in 2017, Skim AI Technologies, Inc. offers guidance to CEOs, founders, venture capital firms, private equity investors, and other stakeholders in the field of artificial intelligence. The company focuses on AI advisory services, due diligence, and AI as a service, providing both fractional a
Highlights
$50,000+
Min Project Size
10-49
Employees
New York, New York, Us
Services Provided
50% AI Strategy & Roadmap Consulting
30% Generative AI
20% LLM Integration & Prompt Engineering
AI Summary
“Skim AI Technologies Inc. provides AI advisory, due diligence, and development services to executives and investors across diverse sectors, tailoring support to project needs and growth.”
Cognilytic Technologies
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Cognilytic, a global provider of Cloud-based AI and IoT solutions in collaboration with top Cloud partners, is helping businesses initiate their digital transformation journeys. The company is developing AI accelerators that can be easily integrated with a business's current operations. Through its
Highlights
50-249
Employees
Chennai, Tamil Nadu, In
Services Provided
20% LLM Integration & Prompt Engineering
20% AI Strategy & Roadmap Consulting
10% Cloud Consulting & SI
50% Operational Process Consulting
AI Summary
“Cognilytic Technologies delivers cloud-based AI and IoT solutions, leveraging expertise in machine learning, consulting, and training to drive businesses' digital transformation with tailored insights.”
Deific Digital
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Deific Digital is a leading, comprehensive IT solutions provider focused on designing high-performance digital ecosystems. In a time when a "digital-first" approach is insufficient, we enable businesses to become AI-native, combining human creativity with the agility of autonomous technology to tack
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided+5 Services
17% Mobile App Development (iOS & Android)
3% E-Commerce Development
14% Custom Web Application Development
13% Search Engine Optimization (SEO)
AI Summary
“Deific Digital delivers AI-enhanced IT solutions across mobile, gaming, web, and enterprise software, combining innovation and strategic consulting to drive scalable digital transformation and measurable growth.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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