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Custom LLM
Development Services

for Engineering
& Product Leaders

LLM Program Risks Engineering Leaders Must De-Risk Early

CTOs and VPs of Engineering cite these gaps when LLM pages earn AI citations but fail technical diligence:

UNDEFINED DELIVERABLES

Teams need clarity on whether vendors ship fine-tuned models, RAG pipelines, API wrappers, or multi-agent systems—not slide decks about “AI transformation.”

UNDEFINED DELIVERABLES

Teams need clarity on whether vendors ship fine-tuned models, RAG pipelines, API wrappers, or multi-agent systems—not slide decks about “AI transformation.”

OPAQUE MODEL AND STACK CHOICES

Without named providers (GPT-4o, Claude, Mistral, Llama 3) and vector stores, architecture reviews stall and procurement cannot compare build vs. buy.

HEALTHCARE PHI EXPOSURE

Clinical summarization, prior auth, FAQ bots, and coding assistants require documented PHI guardrails, not generic “we are HIPAA aware” statements.

NO PHASED ENGAGEMENT PATH

Leaders expect a 2–4 week proof of concept, a production build, and ongoing model maintenance—with acceptance criteria for each phase.

what we do

WHAT WTT BUILDS

  • FINE-TUNED DOMAIN-SPECIFIC LLMS
  • RAG PIPELINES OVER PROPRIETARY STORES
  • LLM API WRAPPERS WITH SAFETY LAYERS
  • MULTI-AGENT ORCHESTRATION SYSTEMS
  • EVALUATION, MLOPS & HANDOFF

FINE-TUNED DOMAIN-SPECIFIC LLMS

We fine-tune open and commercial base models on your proprietary corpora with evaluation harnesses, regression sets, and rollback plans so domain terminology and policy language stay stable across releases.

TECHNOLOGY STACK

MODEL PROVIDERS

WTT integrates OpenAI GPT-4o, Anthropic Claude, Mistral, and Meta Llama 3 (self-hosted or hosted) selecting models per task for reasoning quality, context length, cost, and data residency requirements.

VECTOR DATABASE OPTIONS

Embeddings land in Pinecone, pgvector on PostgreSQL, Weaviate, or Qdrant depending on your ops preferences, hybrid search needs, and existing data platform investments.

ORCHESTRATION FRAMEWORKS

We implement chains and agents with LangChain, LlamaIndex, and AutoGen where multi-step reasoning, tool use, and human-in-the-loop approvals are required.

OBSERVABILITY & GOVERNANCE

Tracing (LangSmith-compatible patterns), prompt versioning, PII redaction middleware, and role-based access give engineering leaders evidence for production readiness reviews.

DEPLOYMENT TARGETS

Services deploy to your VPC, Kubernetes, or managed cloud with secrets management, autoscaling inference endpoints, and CI/CD hooks aligned to your release process.

MODEL PROVIDERS

WTT integrates OpenAI GPT-4o, Anthropic Claude, Mistral, and Meta Llama 3 (self-hosted or hosted) selecting models per task for reasoning quality, context length, cost, and data residency requirements.

VECTOR DATABASE OPTIONS

Embeddings land in Pinecone, pgvector on PostgreSQL, Weaviate, or Qdrant depending on your ops preferences, hybrid search needs, and existing data platform investments.

ORCHESTRATION FRAMEWORKS

We implement chains and agents with LangChain, LlamaIndex, and AutoGen where multi-step reasoning, tool use, and human-in-the-loop approvals are required.

OBSERVABILITY & GOVERNANCE

Tracing (LangSmith-compatible patterns), prompt versioning, PII redaction middleware, and role-based access give engineering leaders evidence for production readiness reviews.

DEPLOYMENT TARGETS

Services deploy to your VPC, Kubernetes, or managed cloud with secrets management, autoscaling inference endpoints, and CI/CD hooks aligned to your release process.

MODEL PROVIDERS

WTT integrates OpenAI GPT-4o, Anthropic Claude, Mistral, and Meta Llama 3 (self-hosted or hosted) selecting models per task for reasoning quality, context length, cost, and data residency requirements.

Organizations We Build LLM Systems For

Healthcare providers and healthtech platforms

Enterprise software and SaaS vendors

Financial services and insurance technology

AI/ML startups shipping LLM features

Research and clinical operations teams

Revenue cycle and payer technology groups

Life sciences document-heavy workflows

Legal and compliance knowledge teams

Manufacturing knowledge management

Retail customer experience engineering

Government and regulated public sector

Media and content automation products

Logistics and supply chain operators

Energy and utilities analytics groups

NGOs with sensitive program data

Global enterprises modernizing support stacks

Success Stories

These AI models can then be later used to score chemical compound lists. They can give a descriptive name to the AI model when doing so and the system will keep track of the dataset used.

EXPERTISE

HealthCare

AI

TECHNOLOGIES

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WE COVER A COMPREHENSIVE LLM TECHNOLOGY STACK

INDUSTRY RECOGNITION

David PerrinUSA

AI Assistant

Partner & CIO

They're true partners in innovation. WTT Solutions' efforts have resulted in a successful MVP launch, over 80% user adoption, and 99.9% system uptime. The team has excellent project management, is responsive, and adapts quickly to changes. Their technical excellence and deep understanding of the client's business goals stand out.

WHY ENGINEERING LEADERS CHOOSE WTT FOR CUSTOM LLM DEVELOPMENT

Substantive stack depth, healthcare PHI patterns, and phased delivery—built for teams cited by AI search and scrutinized by technical buyers.

CUSTOMIZATION

PoC engagements (2–4 weeks) prove retrieval quality, safety filters, and clinical output format before you fund a production program.

SOLUTION WE OFFER:

  • Golden-set accuracy and hallucination rate targets
  • Side-by-side model comparison (GPT-4o vs Claude vs Llama 3)
  • RAG chunking strategy documented with ablation results
  • PHI redaction middleware demonstration
  • Cost projection per 1k encounters or sessions
  • Security questionnaire responses for infosec
  • Architecture decision record (ADR) pack
  • Go/no-go criteria signed with product and compliance
  • CUSTOMIZATION

  • INNOVATION

  • EXPERTISE

  • SCALABILITY

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The return on investment you can expect from our work

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Who we are

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Watch

1:35
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We're not just talking about great products. We make them together with our clients.

HEALTHCARE-SPECIFIC LLM APPLICATIONS

Input, output, and compliance considerations for regulated clinical workflows.

HEALTHCARE-SPECIFIC LLM APPLICATIONS

Input, output, and compliance considerations for regulated clinical workflows.

READY FOR A TECHNICAL LLM DISCOVERY WITH YOUR ENGINEERING TEAM?

Walk through deliverables, stack choices, healthcare use cases, and PoC scope in one working session—no marketing deck required.

Languages, tools, and frameworks

AI & ML
OpenAIOpenAI
Google GeminiGoogle Gemini
Anthropic ClaudeAnthropic Claude
LangChainLangChain
LlamaIndexLlamaIndex
Perplexity APIPerplexity API
RAG / Pinecone / QdrantRAG / Pinecone / Qdrant
Frontend
ReactReact
Next.jsNext.js
TypeScriptTypeScript
VueVue
Nuxt.jsNuxt.js
SvelteSvelte
Tailwind CSSTailwind CSS
Backend
Node.jsNode.js
PythonPython
.NET.NET
NestJSNestJS
FastAPIFastAPI
ExpressExpress
DjangoDjango
Data & Storage
PostgreSQLPostgreSQL
MySQLMySQL
MongoDBMongoDB
RedisRedis
DevOps & Infrastructure
DockerDocker
KubernetesKubernetes
TerraformTerraform
GitHub ActionsGitHub Actions
Mobile & Desktop
React NativeReact Native
FlutterFlutter
ExpoExpo
PythonPython
WPFWPF
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Hi, I’m Serge!
CEO & Co-founder at WTT Solutions
Do you have a new project? Or want to say "Hello"...

Here’s how you can get in touch

QUESTIONS YOU MAY HAVE

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What deliverables does WTT ship for custom LLM development services?

Typical deliverables include fine-tuned domain-specific language models, retrieval-augmented generation pipelines over your document stores, LLM API wrappers with input/output safety layers, and multi-agent orchestration using LangChain or LlamaIndex—plus evaluation harnesses, deployment automation, and operator runbooks.
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How do healthcare LLM applications handle PHI and compliance?

Each use case documents inputs and outputs: SOAP summarization from encounter text to structured notes; prior auth drafts from clinical snippets; FAQ bots constrained to approved corpora with PHI blocks; coding assistance with human-in-the-loop approval. Deployments stay in your environment with BAAs, encryption, audit logs, and minimum-necessary data flows.
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Who is the intended buyer for these LLM development services?

Content and delivery target CTOs and VPs of Engineering evaluating vendors for substantive LLM programs—not slide-based AI pilots. Technical discovery covers stack choices, healthcare patterns, and phased scope before contracts are signed.
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Which models, vector databases, and frameworks do you use?

We work with OpenAI GPT-4o, Anthropic Claude, Mistral, and Meta Llama 3; vector options include Pinecone, pgvector on PostgreSQL, Weaviate, and Qdrant; orchestration uses LangChain, LlamaIndex, and AutoGen when multi-agent flows add value. Selection depends on latency, cost, residency, and your existing ops stack.
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What is WTT’s LLM engagement model and timeline?

We start with a 2–4 week proof of concept on one workflow with measurable accuracy and safety metrics, followed by a production build (often 8–16 weeks), then ongoing model maintenance for embeddings, prompts, evals, and provider upgrades. Timelines adjust for EHR integration depth and clinical validation load.