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

EZMID
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We are a European software company that has been focusing on Health, Finance, Social, and HR sectors since 2015. We utilize contemporary methods combined with practical solutions to fulfill the high demands of our clients. Feel free to reach out for a complimentary quote and consultation. For more d
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Zilina, Sk
Services Provided
35% Custom Web Application Development
15% Mobile App Development (iOS & Android)
30% Machine Learning Model Development
20% LLM Integration & Prompt Engineering
AI Summary
“EZMID is a European software company since 2015, providing innovative solutions across Health, Finance, Social, and HR sectors, combining modern methods with practical client-focused approaches.”
Bonami Software Private Limited
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Bonami Software is a technology company certified at CMMI Level 5, specializing in data-driven solutions for contemporary businesses. Our main strengths lie in Data Science and Analytics utilizing BigQuery and Databricks, AI-driven intelligent systems featuring LLM orchestration and RAG pipelines, a
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Noida, Uttar Pradesh, In
Services Provided+2 Services
28% Custom Web Application Development
23% Mobile App Development (iOS & Android)
12% Generative AI
20% LLM Integration & Prompt Engineering
AI Summary
“Bonami Software specializes in data-driven, AI-powered solutions, offering comprehensive product development and deployment across cloud platforms, serving diverse sectors with certified expertise in software and analytics.”
AENYX
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AENYX is a specialized software development studio catering to founders and startups. We create mobile applications for iOS and Android using React Native, along with web solutions when appropriate. Most of our deliverables are available in the App Store and Play Store. For web development, we utili
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided
18% Custom Web Application Development
32% Mobile App Development (iOS & Android)
30% LLM Integration & Prompt Engineering
20% Generative AI
AI Summary
“AENYX is a software studio specializing in mobile and web app development using React Native, Next.js, and AI integrations, collaborating directly with founders and startups.”
Locusive
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Hello and welcome to Locusive! If you've ever found yourself lost in the complexities of a SaaS tool wishing for a faster way to find solutions, or if you're a Customer Success Manager (CSM) overwhelmed by endless inquiries, we understand your situation. We've experienced it too. We recognize the im
Highlights
2-9
Employees
Services Provided
40% Custom AI Chatbot Development
20% Conversational AI & Voice Assistant Development
30% LLM Integration & Prompt Engineering
10% CRM Consulting and SI
AI Summary
“Locusive develops an AI assistant that simplifies SaaS tool usage and enhances customer success management by efficiently addressing inquiries and streamlining support processes.”
MarketKloud
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MarketKloud is a company specializing in AI systems and software engineering, dedicated to creating intelligent and scalable software solutions for contemporary businesses. We craft AI-driven applications, automation systems, and tailored software platforms utilizing Python, current web technologies
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
20% AI Strategy & Roadmap Consulting
30% LLM Integration & Prompt Engineering
25% Custom AI Chatbot Development
15% Machine Learning Model Development
AI Summary
“MarketKloud develops intelligent, scalable AI-driven software solutions and automation systems to help businesses enhance decision-making, streamline operations, and create innovative digital products using advanced technologies.”
Shelpuk AI Technology Consulting
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About Us: We are a group of ex-Google and Amazon engineers, AI PhDs, startup founders, and former executives from billion-dollar firms, united to guide our clients through the AI-first transition. Why Choose Us as Your Partner? Our Offerings: Our Accolades: Collaborate with us for unmatched AI knowl
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided
40% Generative AI
30% AI Strategy & Roadmap Consulting
20% LLM Integration & Prompt Engineering
10% AI Model Fine-Tuning & Training
AI Summary
“Shelpuk AI Technology Consulting comprises former Google, Amazon engineers, AI PhDs, and executives, delivering expert guidance and solutions for seamless AI transition across industries.”
Vertex Infinity
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At Vertex Infinity, we are fueled by a commitment to innovation in software development. We deliver top-tier web and software solutions tailored to the needs of clients ranging from startups to large corporations worldwide. Our strengths in building large-scale systems from the ground up, along with
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+2 Services
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% Legacy System Modernization
20% AI Strategy & Roadmap Consulting
AI Summary
“Vertex Infinity specializes in innovative, scalable software and AI solutions, delivering custom web and large-scale systems to global clients across startups and enterprises.”
L2labs OU
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We assist two types of clients in accelerating their projects without excessive spending: - Individual founders developing and launching AI-driven minimum viable products (MVPs). - Corporate innovation teams conducting low-risk pilot initiatives. Why do teams choose us? We eliminate prolonged resear
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Tallinn, Harju, Ee
Services Provided+2 Services
15% Custom AI Chatbot Development
20% Machine Learning Model Development
10% AI Strategy & Roadmap Consulting
25% LLM Integration & Prompt Engineering
AI Summary
“L2labs OU accelerates AI-driven product development and pilot projects for founders and corporations, delivering feasible, on-budget MVPs with expert technical support and clear outcomes.”
Expert Soft Solution
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Expert Soft Solution is a comprehensive software development firm that focuses on custom SaaS applications, enterprise web solutions, and AI-driven systems. We assist businesses in digitizing their operations, automating workflows, and creating scalable, secure, and high-performance platforms. Our p
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Gujranwala, Pk Punjab, Pk
Services Provided+5 Services
4% Mobile App Development (iOS & Android)
8% API Development & Integration
10% Custom Web Application Development
8% ERP & CRM Development
AI Summary
“Expert Soft Solution develops custom SaaS and AI-driven enterprise software using modern technologies, delivering scalable, secure, and efficient applications across diverse industries with focus on client collaboration.”
People Apps Inc
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People Apps was established in Costa Rica with the aim of providing our own digital products. Backed by Grupo Corporativo Chess, which consists of three major companies—Routech Latinoamericana, Consulting Group, and People Apps—our team boasts over 18 years of experience. We strive to innovate and t
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
San Jose, San Jose, Cr
Services Provided+2 Services
23% Custom Web Application Development
10% E-Commerce Development
17% Mobile App Development (iOS & Android)
20% Generative AI
AI Summary
“People Apps Inc., based in Costa Rica, delivers innovative software and digital solutions employing agile methodologies and extensive industry expertise, ensuring quality, usability, and functional excellence across projects.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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