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

Tensorway
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Tensorway isn't just a company; it's an environment that enables us to achieve extraordinary things. We designed this organization to nurture and grow innovative ideas. Currently, we are particularly thrilled about the potential of Artificial Intelligence. The appeal of AI solutions lies in their ab
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Alicante (Alacant), Es
Services Provided+1 Services
13% AI Strategy & Roadmap Consulting
12% LLM Integration & Prompt Engineering
15% Generative AI
10% AI Agent & Multi-Agent System Development
AI Summary
“Tensorway, a Spain-based technology firm, specializes in AI consulting, generative AI, and custom software development, delivering innovative AI-driven solutions to optimize diverse business challenges.”
Spaceup Ai
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We aim to make automations and chatbots available to the general public, enabling them to use these tools efficiently to save time. At the same time, CEOs and founders can focus on expanding their businesses while enjoying their lives. Time is a precious resource, and the ideal moment to start autom
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
10% AI Strategy & Roadmap Consulting
25% LLM Integration & Prompt Engineering
40% Custom AI Chatbot Development
25% Generative AI
AI Summary
“Spaceup Ai develops accessible automation and chatbot solutions that empower individuals and business leaders to save time and enhance productivity, enabling focus on growth and life balance.”
Fortifier
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Fortifier Company specializes in tailored, dependable software development for InsurTech and insurance firms. Our mission is to facilitate the digital transformation of the insurance sector. By integrating modern IT technologies into business process management and creating new digital channels for
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Kharkiv, Kharkiv, Ua
Services Provided+2 Services
13% Mobile App Development (iOS & Android)
22% Custom Web Application Development
15% SaaS Product Development
28% Machine Learning Model Development
AI Summary
“Fortifier delivers tailored, secure software solutions for InsurTech and insurance firms, leveraging advanced technologies to drive digital transformation and enhance operational efficiency.”
Mass Software Solutions Private Limited
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Mass Software Solutions, located in Kolkata, India, is a leading technology and development partner. We adopt a human-centered approach to intricate engineering, turning the ambitious visions of global companies, rapidly growing startups, and innovative founders into effective and scalable digital s
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Kolkata, West Bengal, In
Services Provided+1 Services
23% Mobile App Development (iOS & Android)
10% Custom Web Application Development
20% Generative AI
14% LLM Integration & Prompt Engineering
AI Summary
“Mass Software Solutions, Kolkata-based technology partner, delivers scalable digital solutions with expertise in mobile, web, AI, and cloud services focused on business growth and value.”
Tecta AI Corp.
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Connecting the possibilities of AI with operational success through customized solutions and strategic advisory services.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Toronto, Ontario, Ca
Services Provided+1 Services
30% AI Strategy & Roadmap Consulting
25% LLM Integration & Prompt Engineering
15% Custom AI Chatbot Development
15% Machine Learning Model Development
AI Summary
“Tecta AI Corp. delivers customized AI solutions and strategic advisory services, enabling businesses to harness artificial intelligence for enhanced operational success and innovation.”
Spartan
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Welcome to Spartan, a technology solutions firm dedicated to helping startups achieve profitability. We focus on remote work to enhance results and reduce costs. Our offerings encompass Mobile App, Web, Backend development, Cloud Solutions, and Emerging Technologies. With a strong tech foundation, w
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Los Angeles, California, Us
Services Provided+2 Services
15% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% Backend Development
20% Machine Learning Model Development
AI Summary
“Spartan is a technology solutions firm specializing in mobile, web, backend development, and emerging technologies like AI and IoT, helping startups maximize profitability through remote work and innovation.”
TechInSF
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TechInSF: San Francisco's Leading Digital Growth and IT Partner Located in the center of the tech capital of the world, TechInSF acts as a powerful growth catalyst for businesses eager to excel in the digital arena. We go beyond traditional consulting; we are strategic partners with expertise in A
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
San Francisco, California, Us
Services Provided+5 Services
13% Pay Per Click
12% Social Media Marketing
5% Email Marketing & Automation
3% Digital Strategy
AI Summary
“TechInSF is a San Francisco-based digital growth partner offering expert digital marketing, AI-enhanced workflows, high-performance web development, and managed IT infrastructure with 24/7 support.”
LoboCode
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LoboCode provides a wide variety of services, such as tailored software solutions, development of web and mobile applications, and integration of legacy systems. We prioritize streamlining processes and improving user experiences, working in close partnership with businesses to foster their success.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Zurich, Zurich, Ch
Services Provided
20% Mobile App Development (iOS & Android)
30% Custom Web Application Development
30% Machine Learning Model Development
20% LLM Integration & Prompt Engineering
AI Summary
“LoboCode delivers customized software development, including web and mobile applications, and legacy system integration, enhancing business processes and user experiences through close client collaboration.”
Mozstro
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Mozstro is a specialized AI transformation consultancy located in Manchester and Leeds, focusing on secure and compliant AI solutions for regulated sectors. We provide quick, tangible results by utilizing LLMs, automation, and data-driven products.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
15% AI Strategy & Roadmap Consulting
15% Custom AI Chatbot Development
25% LLM Integration & Prompt Engineering
5% IT Staff Augmentation
AI Summary
“Mozstro is a UK-based AI transformation consultancy delivering secure, compliant AI and automation solutions with rapid, data-driven results for regulated industries.”
INYSTER
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INYSTER specializes in creating tailored web applications for businesses that require more than just standard off-the-shelf software. We provide proof of concepts (POCs) in 2-4 weeks and minimum viable products (MVPs) in 4-8 weeks, all developed internally by a senior architect. There is no subcontr
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Services Provided+3 Services
35% Custom Web Application Development
10% API Development & Integration
5% E-Commerce Development
13% Generative AI
AI Summary
“INYSTER develops bespoke web applications and automates business processes using modern technologies, delivering fast, in-house solutions with full client code ownership and remote support across industries.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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