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

Doug Silkstone - Full-Stack Engineering
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My name is Doug Silkstone, and I am a British software engineer residing in Prague. I focus on Greenfield Projects and Early-Stage Startups, assisting founders in developing their initial production systems, MVPs, and LLM workflows. Throughout the last decade, I've collaborated with tech-savvy compa
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Prague, Cz
Services Provided+4 Services
23% Custom Web Application Development
13% API Development & Integration
10% Backend Development
5% Frontend Development
AI Summary
“Doug Silkstone is a British full-stack engineer in Prague specializing in early-stage startups and greenfield projects, combining software development with growth and marketing expertise to build revenue-generating products.”
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Need For Apps
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Needfor Apps is a no-code/low-code development firm that enables businesses to quickly and accurately create intelligent, scalable applications. With our expertise in Bubble.io, Airtable, AI integration, and automation, we focus on developing tailored solutions that foster business growth, enhance e
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
15% AI Agent & Multi-Agent System Development
15% AI Model Fine-Tuning & Training
20% LLM Integration & Prompt Engineering
AI Summary
“Needfor Apps specializes in no-code/low-code solutions, leveraging Bubble.io, Airtable, AI, and automation to develop scalable, efficient applications that enhance business operations and growth.”
Centroida
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Centroida is a blockchain-focused company that creates comprehensive, end-to-end products and solutions for enterprises aiming to enhance their market presence while maintaining their core focus. We provide a complete service encompassing the entire software development lifecycle, including scoping,
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Sofia, Sofia, Bg
Services Provided+1 Services
20% Custom Web Application Development
30% Blockchain & Web3 Development
25% Machine Learning Model Development
10% AI Strategy & Roadmap Consulting
AI Summary
“Centroida offers end-to-end enterprise software development with a blockchain focus, specializing in dApps, smart contracts, and auditing, streamlining solutions through a unified vendor approach.”
deepsense.ai
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We are an AI partner for organizations seeking production-level outcomes, assisting them in designing, building, and scaling AI systems that provide measurable returns on investment with reliability, security, and complete operational control. With over a decade of experience, a team of more than 12
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Warszawa, Masovian, Pl
Services Provided+4 Services
8% AI Strategy & Roadmap Consulting
10% LLM Integration & Prompt Engineering
8% Custom AI Chatbot Development
12% Machine Learning Model Development
AI Summary
“deepsense.ai partners with organizations to design, build, and scale reliable AI systems, leveraging extensive expertise and proprietary tools to deliver measurable business outcomes across industries.”
Fingent
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Fingent is a reliable technology partner for businesses looking to adopt AI-driven innovation and high-quality software solutions. Our streamlined project teams specialize in the latest AI technologies, ensuring faster, superior, and cost-effective software development—whether for new web or mobile
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
White Plains, New York, Us
Services Provided+5 Services
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% API Development & Integration
5% Legacy System Modernization
AI Summary
“Fingent delivers AI-driven, high-quality software solutions and custom development services, serving leading clients globally since 2003 with innovative, efficient, and reliable technology expertise.”
CODEICX
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CODEICX Inc: Driving Digital Transformation Through AI and Software Development Located in Taipei, Taiwan, CODEICX Inc. stands out as a premier technology partner that specializes in custom software development, cutting-edge AI solutions, and comprehensive IT services. Our mission is to help busin
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
20% Custom Web Application Development
8% Mobile App Development (iOS & Android)
13% API Development & Integration
10% QA & Software Testing
AI Summary
“CODEICX Inc specializes in custom software development, AI and data engineering, delivering secure, scalable digital solutions that enhance efficiency and drive business growth.”
TecLab
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Teclab is committed to defining the digital future for businesses around the globe. We see artificial intelligence and digital transformation as essential cornerstones of contemporary business success, rather than mere technological trends. Our goal is to support organizations as they confidently na
Highlights
2-9
Employees
Marco de Canaveses, North, Pt
Services Provided+3 Services
10% IT Staff Augmentation
10% Other IT Consulting and SI
15% Machine Learning Model Development
10% Custom AI Chatbot Development
AI Summary
“TecLab partners globally to drive business success through tailored digital transformation and AI strategies, combining deep industry insight with advanced technology expertise.”
Origami Studios
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Nasdaq, Nestlé, Johnson & Johnson, UNICEF, Experian, Domino's, and the Asian Development Bank have relied on us for critical deliveries, returning consistently for our services. Origami Studios, based in New Jersey, specializes in custom software development, focusing on AI-driven solutions for busi
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Parsippany-Troy Hills, New Jersey, Us
Services Provided+7 Services
15% Custom Web Application Development
8% Mobile App Development (iOS & Android)
10% API Development & Integration
8% SaaS Product Development
AI Summary
“Origami Studios, a New Jersey-based firm, delivers custom software, AI-driven automation, and mobile applications across diverse sectors with expert teams ensuring innovative, reliable technology solutions.”
NextAstra Technologies
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NextAstra is a specialized company that develops custom AI and enterprise software, providing ready-to-use solutions that emphasize efficiency, scalability, and tangible returns on investment. We create systems that minimize manual tasks, lower operational expenses, and expand alongside your busines
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided+3 Services
8% AI Strategy & Roadmap Consulting
10% Custom AI Chatbot Development
10% Machine Learning Model Development
8% Workflow Automation (Zapier / Make / n8n)
AI Summary
“NextAstra Technologies specializes in custom AI and enterprise software development, delivering scalable, efficient solutions that reduce manual tasks and operational costs while enhancing business growth.”
Involve.software
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Involve.software is an engineering firm specializing in the development of custom AI and fintech solutions specifically designed for your business needs, rather than providing generic templates or tools meant for others' processes. We create intelligent infrastructure that aligns with your workflow,
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
17% LLM Integration & Prompt Engineering
10% AI Strategy & Roadmap Consulting
7% AI Agent & Multi-Agent System Development
33% Business Model Design & Validation
AI Summary
“Involve.software delivers custom AI and fintech solutions, enabling seamless integration across industries with measurable results, leveraging expertise in enterprise AI, tokenization, and financial automation.”

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Top LLM Integration & Prompt Engineering Companies

List of the Best LLM Integration & Prompt Engineering Agencies

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