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Large Language Models (LLM) Development Services

From smart copilots to enterprise-scale AI systems, we build LLM solutions aligned with your product, data, and workflows.

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Our LLM development services

End-to-end LLM development, from architecture and model selection to deployment and scaling.

Our Technical Expertise

Our team has hands-on expertise in LLM systems: SFT, RLHF, RAG pipelines, agent orchestration, and production-grade infrastructure.

Natural language processing

Our team helps machines understand languages so your apps can read, interpret, and respond just like a person would.

Machine learning

Our machine learning skills turn data into smart predictions, insights, and recommendations that drive decision-making.

Sentiment analysis

We teach AI to detect the mood and understand the implications behind the dialog in various conversational contexts.

In-context learning

We teach the model to perform a task simply by seeing examples in the conversation and/or input, with no need for retraining.

Few-shot learning

With the help of few-shot learning, the model shows good performance during a new task after seeing just a small number of examples.

Retrieval-augmented generation (RAG)

We connect LLMs with your own data sources, so the algorithm can fetch relevant information on demand instead of just theorizing.

Portfolio

Production-grade LLM systems, spanning RAG pipelines, AI agents, and custom model integrations across diverse domains.

LLM-Driven Legal Document Summarization
ai-agent-for-pre-screening
ai-concierge-for-hotel-network

Are you ready to make your business smarter? We will help!

What are the benefits of a custom LLM?

Custom LLMs deliver higher accuracy, better control, and deeper alignment with your business.

Reduced hallucinations

Domain-aligned LLM models and structured data reduce incorrect or fabricated outputs.

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Reduced hallucinations

Domain-aligned LLM models and structured data reduce incorrect or fabricated outputs.

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Seamless integration with your systems

A tailored LLM connects directly to your products, APIs, and data sources.

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Seamless integration with your systems

A tailored LLM connects directly to your products, APIs, and data sources.

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Scalability

Custom LLMs are optimized for reliability, latency, and growth.

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Scalability

Custom LLMs are optimized for reliability, latency, and growth.

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Security and data control

Fine-tuning and guardrails ensure consistent, predictable AI behavior.

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Security and data control

Fine-tuning and guardrails ensure consistent, predictable AI behavior.

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Large Language Model development process

Our LLM development process covers the full lifecycle: architecture design, data pipelines, model adaptation, integration, and production scaling.

Discovery and strategy

We, as an LLM application development company, start by understanding your business goals and workflows, then define a clear, long-term AI roadmap.

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Discovery and strategy

We, as an LLM application development company, start by understanding your business goals and workflows, then define a clear, long-term AI roadmap.

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Model architecture and design

We design a technical blueprint covering model selection, architecture, system integration, and scalability.

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Model architecture and design

We design a technical blueprint covering model selection, architecture, system integration, and scalability.

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Development and integration

Our team builds the product, writes the necessary pipelines, and merges it with systems, databases, and processes you already have.

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Development and integration

Our team builds the product, writes the necessary pipelines, and merges it with systems, databases, and processes you already have.

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Model training

We combine fine-tuning with RAG, few-shot prompting, and in-context learning to align model behavior with your data and use cases.

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Model training

We combine fine-tuning with RAG, few-shot prompting, and in-context learning to align model behavior with your data and use cases.

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QA and security check

We ensure the LLM model is reliable and safe through rigorous testing and implement security measures such as privacy checks, access controls, and prompt injection protection.

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QA and security check

We ensure the LLM model is reliable and safe through rigorous testing and implement security measures such as privacy checks, access controls, and prompt injection protection.

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Deployment and support

Once deployed, we ensure your LLM solution remains reliable and effective through ongoing maintenance, updates, scaling, and continuous data improvements.

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Deployment and support

Once deployed, we ensure your LLM solution remains reliable and effective through ongoing maintenance, updates, scaling, and continuous data improvements.

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Build your LLM solution with us!

Industries

What business domains can benefit from the language model's power?

Fintech

Fraud detection systems, automated financial reporting, risk analysis tools, and AI-powered customer support assistants.

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Fintech

Fraud detection systems, automated financial reporting, risk analysis tools, and AI-powered customer support assistants.

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E-commerce

Personalized recommendation engines, AI shopping assistants, product search optimization, and automated support agents.

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E-commerce

Personalized recommendation engines, AI shopping assistants, product search optimization, and automated support agents.

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E-learning

AI-powered tutors, personalized learning platforms, content generation tools, and automated grading systems.

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E-learning

AI-powered tutors, personalized learning platforms, content generation tools, and automated grading systems.

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Real estate

Property search assistants, automated listing generation, document processing tools, client communication bots, and market analysis systems.

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Real estate

Property search assistants, automated listing generation, document processing tools, client communication bots, and market analysis systems.

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Healthcare

Clinical documentation assistants, patient-facing chatbots, medical knowledge retrieval systems, and diagnostic support tools.

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Healthcare

Clinical documentation assistants, patient-facing chatbots, medical knowledge retrieval systems, and diagnostic support tools.

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Manufacturing

Process automation agents, documentation assistants, maintenance knowledge systems, and operational analytics tools.

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Manufacturing

Process automation agents, documentation assistants, maintenance knowledge systems, and operational analytics tools.

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Fitness

Personalized training assistants, nutrition planning tools, progress tracking systems, and AI coaches for real-time guidance and engagement.

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Fitness

Personalized training assistants, nutrition planning tools, progress tracking systems, and AI coaches for real-time guidance and engagement.

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Travel

AI travel assistants, itinerary planning tools, booking support bots, personalized recommendations, and customer service automation systems.

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Travel

AI travel assistants, itinerary planning tools, booking support bots, personalized recommendations, and customer service automation systems.

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Tech stack

Tools we use to bring your ideas to life.

Programming languages

Python, C++/CUDA

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Programming languages

Python, C++/CUDA

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Machine learning/deep learning tools

TensorFlow, PyTorch

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Machine learning/deep learning tools

TensorFlow, PyTorch

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LLM/NLP libraries

SentenceTransformers, spaCy, NLTK

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LLM/NLP libraries

SentenceTransformers, spaCy, NLTK

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Model training

DeepSpeed, FSDP, LoRA/QLoRA/PEFT

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Model training

DeepSpeed, FSDP, LoRA/QLoRA/PEFT

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LLM integration

LangChain, LlamaIndex, OpenAI/Anthropic/Azure SDKs

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LLM integration

LangChain, LlamaIndex, OpenAI/Anthropic/Azure SDKs

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Vector databases

Pinecone, Weaviate, Qdrant

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Vector databases

Pinecone, Weaviate, Qdrant

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Databases/storage

PostgreSQL/MySQL, MongoDB, Redis

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Databases/storage

PostgreSQL/MySQL, MongoDB, Redis

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Deployment + DevOps

AWS, Docker, Kubernetes

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Deployment + DevOps

AWS, Docker, Kubernetes

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Why Choose Yellow For Custom LLM Development?

Proven expertise across the full LLM stack, from data and fine-tuning to RAG, agents, and production infrastructure.

Business-first, always

Every LLM solution we develop starts with your business goals, workflows, and real-world bottlenecks, so it delivers value, not just theatrical demos.

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Business-first, always

Every LLM solution we develop starts with your business goals, workflows, and real-world bottlenecks, so it delivers value, not just theatrical demos.

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Security you can trust

We implement guardrails, access controls, and data protection to ensure safe and compliant AI systems.

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Security you can trust

We implement guardrails, access controls, and data protection to ensure safe and compliant AI systems.

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Hands-on expertise

Our team combines deep AI knowledge with years of real software delivery experience, which means fewer experiments and more solutions that actually work in production.

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Hands-on expertise

Our team combines deep AI knowledge with years of real software delivery experience, which means fewer experiments and more solutions that actually work in production.

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Scalable architecture

Our solutions are built to grow with your business—handling increasing data, users, and complexity.

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Scalable architecture

Our solutions are built to grow with your business—handling increasing data, users, and complexity.

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Bring smarter automation to your business!

Testimonials

A large language model development company our clients trust.

When Yellow is working on a task, they understand how it will impact the product down the line. The team has provided great insight into our processes, making sure we don’t make small mistakes that will impact us in a larger way in the future.

Christopher Bianco

Christopher Bianco

CEO, Hyvery inc.

They were very accessible regardless of the time difference as well as communication was good. We had a couple bumps here and there regarding designs that were not originally discussed in our UX/UI designs but they were quick to find solutions as well as any needed changes we requested.

Bradley J.Humble

Bradley J. Humble

Co-Founder & CTO, DealStryker, Inc.

I liked working with them because they were good. With their work, we increased our mobile app’s user usage. We also got reviewed as one of the top 10 employee engagement services in Europe. Their project management was really good. They worked in sprints, and I always communicated directly with their developer. More importantly, they were attentive to our project's details.

Thomas Urban

Thomas Urban

Founder & CTO, Weffect

Browser compatibility and readability have increased markedly since the engagement began. Yellow's development process helped them beat deadlines and respond quickly to any technical concerns that arose. Their ability to bring creative ideas of their own to the table made them a valuable partner. Yellow typically understood exactly what the issue was and came back with a fix right away. 

Jerry Sparkman

Jerry Sparkman

IT Director, National Association of Tax Professionals

If you are looking for a partner to collaborate with for the development process, I would consider hiring Yellow. Yellow has an intelligent team of developers that collaborated on the project to build a quality app. They follow instructions seamlessly, respond effectively to feedback, and invest themselves in the overall success of the product. I would happily use them again if we needed developing services.

Chris Pointon

Chris Pointon

CTO, Racefully

Yellow is by far the best at helping us make decisions to push our company forward. I’d heard about them through a personal connection in the Bay Area. Yellow stands out because they’re invested in the results and clients. Every single person on Yellow’s team genuinely cares about what they’re doing. I really appreciate that about them and it’s the main reason we will continue our relationship for as long as possible.

William Hamilton

William Hamilton

Co-Founder, SmartPath.co

Yellow quickly and seamlessly assimilated into a fast-paced and nuanced workflow, completing all deliverables on time. Responsive to questions, updates, and issues, they have streamlined management operations and reduced work backlogs by directing communication to appropriate in-house team members.

Eric Morgan

Eric Morgan

Product Manager, Speed Digital

The new features have benn well received by users. Attentive and flexible, the team excelled at responding to stakeholders in a timely matter. Their technical expertise allows them to propose valuable solutions.

Ian Ross

Ian Ross

CEO, OppSites

Engaged, supportive, and invested in project success, the team offered constructive criticism, creative guidance, and honest communication. Their user-centered approach resulted in a unique and reliable product that operates well on all systems.

Jim Barkow

Jim Barkow

Founder, Famlicious Inc.

Because of marketing costs, the B2C application fell out of use in favor of a different B2B tool. Yellow was very focused on customer satisfaction, and they participate regularly in standups. They helped solidify features, and they thoroughly explained their process.

Sandro Tuzzo

Sandro Tuzzo

CEO, Separate.us

We're impressed with their loyalty and honesty. They were able to stay true to the original quote even though we needed to change and add a few requirements. They've done a lot of good work for us on all fronts, but it's amazing to see that they're able to stick to what they initially promised.

Jon Shower

Jon Shower

CEO, BlackBird

Mainly, I go by client feedback to judge Yellow’s performance, and the clients have been very impressed with their work. The team is exact in what they do, their delivery has been good, and they’re on time and budget.

Adam Plager

Adam Plager

CEO, QKSS

Their performance was good. I didn’t expect that kind of performance from someone working offsite. I was happy that they completed the project ahead of schedule, so we had some time left to work on additional projects and improvements.

Max Abukhovsky

Max Abukhovsky

CEO & Founder, Coverium

When Yellow is working on a task, they understand how it will impact the product down the line. The team has provided great insight into our processes, making sure we don’t make small mistakes that will impact us in a larger way in the future.

Christopher Bianco

Christopher Bianco

CEO, Hyvery inc.

They were very accessible regardless of the time difference as well as communication was good. We had a couple bumps here and there regarding designs that were not originally discussed in our UX/UI designs but they were quick to find solutions as well as any needed changes we requested.

Bradley J.Humble

Bradley J. Humble

Co-Founder & CTO, DealStryker, Inc.

I liked working with them because they were good. With their work, we increased our mobile app’s user usage. We also got reviewed as one of the top 10 employee engagement services in Europe. Their project management was really good. They worked in sprints, and I always communicated directly with their developer. More importantly, they were attentive to our project's details.

Thomas Urban

Thomas Urban

Founder & CTO, Weffect

Browser compatibility and readability have increased markedly since the engagement began. Yellow's development process helped them beat deadlines and respond quickly to any technical concerns that arose. Their ability to bring creative ideas of their own to the table made them a valuable partner. Yellow typically understood exactly what the issue was and came back with a fix right away. 

Jerry Sparkman

Jerry Sparkman

IT Director, National Association of Tax Professionals

FAQ

What is an LLM?

LLM is an AI system trained on vast amounts of text data to understand, generate, and work with human language.

How is LLM created?

It learns from colossal quantities of data and is then fine-tuned to do specific tasks like answering questions, generating content, summarizing information, writing code, and powering conversational interfaces.

How much does an LLM solution cost?

LLM solutions typically range from $20,000 for simple copilots or integrations to $300,000+ for fully customized, enterprise-grade AI systems.

How long does it usually take to develop a custom LLM solution?

The process usually takes from a few weeks to several months. Simple copilots can be delivered in 6–8 weeks, while more complex, enterprise-grade LLM systems with fine-tuning, RAG, and integrations may take 12–20+ weeks.

Can LLMs integrate with the software/systems we use?

Yes, they can plug into your software via APIs/databases with minimal disruptions.

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