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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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

2,741 Companies

List of the Best LLM Integration & Prompt Engineering Agencies

Veso AI
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A dedicated, global team of GenAI expert developers, supported by our own platform for quick solution development at vesogdk.com, makes Veso AI an ideal option for those who: - Achieve development speeds four times faster. - Manage intricate GenAI implementations. - Value data security and system ef
Highlights
$100,000+
Min Project Size
10-49
Employees
Services Provided
40% Generative AI
15% AI Strategy & Roadmap Consulting
30% LLM Integration & Prompt Engineering
15% Machine Learning Model Development
AI Summary
“Veso AI is a global GenAI expert team offering rapid, secure development of complex AI systems like Inference and Vector Retrieval, enhancing integration and efficiency across platforms.”
StarSpectre
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StarSpectre is a software development studio located in Lausanne, Switzerland. We specialize in creating high-performance websites, web applications, mobile applications, internal tools, and AI-driven workflows for teams that prioritize speed, clarity, and dependable engineering. Our emphasis is on
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Lausanne, Ch
Services Provided+3 Services
25% Custom Web Application Development
18% Mobile App Development (iOS & Android)
8% API Development & Integration
5% Custom AI Chatbot Development
AI Summary
“StarSpectre is a Swiss software studio specializing in high-performance websites, mobile apps, AI-driven workflows, and scalable solutions, focusing on maintainable, efficient, and practical engineering.”
Pollum
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Are you interested in creating blockchain-based solutions? Look no further than Pollum, an innovative software studio committed to excellence. At Pollum, we guide you throughout the entire process of developing a Web3 solution, from initial ideas to strategies after launch. We consider ourselves mor
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
23% Blockchain & Web3 Development
3% Mobile App Development (iOS & Android)
7% Custom Web Application Development
27% LLM Integration & Prompt Engineering
AI Summary
“Pollum is a software studio specializing in blockchain and Web3 solutions, offering smart contracts, decentralized apps, AI-driven tools, and scaling infrastructure to empower businesses and individuals.”
Sygnifiq Ltd
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Sygnifiq is a leading travel technology consultancy located in the UK, boasting more than 30 years of experience in assisting travel companies to maximize their technology investments. It is headed by Jon Pickles, who serves as the Chairman of the Travel Technology Initiative and is a member of the
Highlights
$1,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Highbridge, Gb
Services Provided
60% AI Strategy & Roadmap Consulting
25% LLM Integration & Prompt Engineering
15% Generative AI
AI Summary
“Sygnifiq Ltd. is a UK-based travel technology consultancy with over 30 years of experience, offering expert guidance to travel companies to optimize technology investments.”
Quick Brown Fox
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Quick Brown Fox is a Laravel development firm that assists VC-backed startups and global enterprises in creating scalable, AI-driven SaaS platforms and custom web applications. With extensive experience in Laravel, Livewire, TailwindCSS, and React Native, we provide high-performance solutions that a
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided+3 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
5% E-Commerce Development
13% Machine Learning Model Development
AI Summary
“Quick Brown Fox specializes in Laravel-based scalable, AI-driven SaaS and custom web applications, offering enterprise backend optimization, workflow automation, and cross-platform mobile development for global clients.”
Torno Solutions
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Torno Solutions is an innovative product engineering partner aiding startups, SaaS firms, and tech-driven enterprises in accelerating their development timelines with Global Sprint Pods—flexible, cross-functional teams focused on speed, responsibility, and results. Established in 2023, we've already
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Northfield, Illinois, Us
Services Provided+1 Services
20% AI Agent & Multi-Agent System Development
10% AI Strategy & Roadmap Consulting
30% LLM Integration & Prompt Engineering
30% IT Staff Augmentation
AI Summary
“Torno Solutions accelerates product engineering for startups and enterprises via flexible, expert Global Sprint Pods, delivering rapid, integrated software solutions with AI/ML and scalable cross-functional teams.”
YK Advanced Soft Corp
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YK Advanced Soft assists companies in utilizing AI, LLM integrations, and tailored software to optimize operations, automate processes, and achieve tangible growth.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Services Provided
20% Custom Web Application Development
30% SaaS Product Development
20% Generative AI
30% LLM Integration & Prompt Engineering
AI Summary
“YK Advanced Soft specializes in AI and large language model integrations, delivering customized software solutions to streamline operations, automate workflows, and drive measurable business growth.”
LetMeExplain.AI
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LetMeExplain is a company specializing in AI products, ready to assist you with your tailored AI development requirements. We offer a range of services, including AI development and consulting, as well as custom machine learning models and ChatGPT integration, all backed by a history of successful A
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided+1 Services
25% Custom AI Chatbot Development
25% Machine Learning Model Development
10% Conversational AI & Voice Assistant Development
10% AI Strategy & Roadmap Consulting
AI Summary
“LetMeExplain.AI specializes in tailored AI solutions, offering development, consulting, custom machine learning models, and ChatGPT integration to meet diverse business needs professionally.”
Appexpedition
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We are enthusiastic about developing mobile applications and websites. Our company is rapidly emerging as a leading app development firm, featuring a talented team of developers skilled in iOS, Android, Flutter, AI, and React. What sets us apart is our unique approach of providing monthly service pa
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Laguna Beach, California, Us
Services Provided+4 Services
20% Mobile App Development (iOS & Android)
10% Custom Web Application Development
8% Backend Development
8% Frontend Development
AI Summary
“Appexpedition specializes in mobile app and website development, leveraging AI and advanced technologies to serve small businesses, healthcare, and entrepreneurs with flexible service payments and maintenance.”
Smart Source AB
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Intelligent digital solutions for intricate problems. We specialize in web and app development, intranet solutions, and system integrations to assist businesses and the public sector in enhancing their digital infrastructure. 🌍 Check out our website: https://www.smartsource.eu/ 💼 Connect with us o
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Malmo, Skane, Se
Services Provided+1 Services
20% Mobile App Development (iOS & Android)
23% Custom Web Application Development
7% API Development & Integration
25% Generative AI
AI Summary
“Smart Source AB delivers intelligent digital solutions, specializing in web and app development, intranet systems, and integrations to support businesses and public sector digital infrastructure improvements.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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