Custom AI Agent Development

Build AI Agents That Think & Act

We don't just automate — we build autonomous AI systems. From Hermes-style reasoning engines to OpenClaw-like agent frameworks, we create LLM-powered agents that understand context, make decisions, and execute tasks without human intervention.

94%

Decision Accuracy

10x

Faster Processing

24/7

Autonomous Operation

AI Agent System Architecture

Agent Response Time

<2s

AI Systems We Build

From reasoning engines to autonomous agents — we architect AI systems that solve real business problems

Reasoning Engines

Multi-step reasoning systems that break down complex problems, evaluate options, and arrive at optimal decisions — like Hermes-style chain-of-thought processing.

  • • Chain-of-thought reasoning
  • • Multi-step problem decomposition
  • • Confidence scoring & validation

Conversational AI Agents

Context-aware chatbots and virtual assistants that maintain conversation state, access knowledge bases, and execute actions through natural language.

  • • Multi-turn conversation memory
  • • Tool use & function calling
  • • Personality & tone customization

RAG Systems

Retrieval-Augmented Generation that grounds AI responses in your documents, databases, and real-time data — eliminating hallucinations and ensuring accuracy.

  • • Vector database integration
  • • Document chunking & embedding
  • • Source attribution & verification

Autonomous Workflows

Self-directed agents that monitor conditions, make decisions, and execute multi-step workflows without human oversight — from lead qualification to incident response.

  • • Event-driven architecture
  • • Self-correction & error recovery
  • • Human-in-the-loop escalation

Computer Vision AI

Image and video analysis systems for quality control, document processing, and visual inspection — integrated with your existing workflows.

  • • Object detection & classification
  • • OCR & document extraction
  • • Anomaly detection

Predictive Systems

AI models that forecast outcomes, identify patterns, and recommend actions — from churn prediction to demand forecasting and risk assessment.

  • • Time-series forecasting
  • • Anomaly detection
  • • Recommendation engines

Our AI Technology Stack

We work with the best AI models and frameworks — choosing the right tool for your specific use case

O

OpenAI

GPT-4, GPT-4o, Assistants API, function calling

A

Anthropic

Claude 3, Claude 3.5 Sonnet, computer use capabilities

L

Llama / Mistral

Open-source models for on-premise, private deployment

P

Pinecone / Weaviate

Vector databases for RAG and semantic search

AI Agent Case Studies

Real AI systems built for real client accounts

Our AI Development Process

From concept to deployment — how we build reliable AI systems

1. Discovery

Understand your use case, data sources, and success criteria. Define what "good" looks like for your AI system.

2. Architecture

Design the system architecture — model selection, data pipeline, integration points, and safety guardrails.

3. Development

Build the AI system with iterative testing, prompt engineering, and fine-tuning for your specific domain.

4. Deploy & Monitor

Production deployment with monitoring, logging, and continuous improvement based on real-world performance.

Why Build AI Agents With Us?

We combine deep technical expertise with business pragmatism

Production-Ready Systems

We don't build demos — we deploy systems that handle real load, with error handling, monitoring, and graceful degradation.

Privacy-First Design

We can deploy on-premise or in your VPC, use private models, and ensure your data never leaves your control.

Direct Collaboration

You work directly with the AI engineers building your system — no account managers, no lost context, no surprises.

Ready to Build Your AI Agent?

Tell us what you're trying to solve. We'll design an AI system that actually works — not a prototype that never ships.

Frequently Asked Questions

Common questions about AI agent development

What exactly is an AI agent and how is it different from automation?

Traditional automation follows fixed rules: "If X happens, do Y." An AI agent reasons: "Given the situation, what's the best action?" AI agents use LLMs to understand context, evaluate options, and make decisions — handling edge cases and exceptions that would break rule-based systems. For example, a rule-based system might route all high-value leads to sales. An AI agent reads the lead's message, researches the company, checks inventory, and decides whether to route to sales, schedule a demo, or send a nurture sequence — all autonomously.

How much does it cost to build a custom AI agent?

AI agent projects typically range from $15,000 for a focused single-purpose agent (like a support chatbot) to $75,000+ for complex multi-agent systems with reasoning, memory, and tool use. Costs depend on: complexity of reasoning required, number of integrations, data volume and preprocessing needs, model choice (OpenAI API vs. open-source vs. fine-tuned), and deployment requirements (cloud vs. on-premise). We provide fixed-price quotes after the discovery phase so there are no surprises.

Can you build AI agents that work with our existing systems?

Absolutely — integration is our specialty. We build agents that connect to your CRM (Salesforce, HubSpot), ERP (NetSuite, SAP), databases, APIs, and internal tools through function calling and API integration. The agent can read from and write to your systems, making it a true team member rather than a standalone chatbot. We've integrated AI agents with NetSuite for inventory-aware sales recommendations, with HubSpot for intelligent lead scoring, and with custom internal tools for operations teams.

How do you prevent AI hallucinations and ensure accuracy?

We use multiple techniques: RAG (Retrieval-Augmented Generation) grounds responses in your documents and data, not the model's training data. Source attribution shows where information came from. Confidence scoring flags uncertain responses for human review. Structured output (JSON mode) forces the model to respond in predictable formats. For critical decisions, we implement human-in-the-loop checkpoints where the agent proposes actions but waits for approval. Our systems typically achieve 94-99% accuracy, with full audit trails of every decision.

Do we need to use OpenAI or can we use private/open-source models?

You have full flexibility. We work with OpenAI (GPT-4, GPT-4o), Anthropic (Claude 3), and open-source models (Llama 3, Mistral, Mixtral) that can run on your infrastructure. For sensitive data or regulatory requirements, we recommend open-source models deployed in your VPC or on-premise — your data never leaves your environment. We can also fine-tune open-source models on your proprietary data for domain-specific performance that matches or exceeds general-purpose APIs at lower cost.

How long does it take to build and deploy an AI agent?

A focused single-purpose agent (like a customer support bot with 50 FAQs) can be deployed in 2-3 weeks. A complex multi-agent system with reasoning, memory, and multiple integrations typically takes 8-12 weeks. The timeline depends on: data preparation and cleanup, integration complexity, testing and refinement cycles, and your review/feedback speed. We work in 2-week sprints with working demos at each milestone — you'll see progress from week one, not a black-box reveal at the end.

What Our Clients Say

Verified reviews from Google Business Profile and Upwork

"I was looking for an ads manager. I got an ads genius and a growth consultant. This guy had endless outstanding ideas for how we could grow our brand and audience. Hiring Bren was one of the best decisions we made."

Brand Growth Client

via Upwork
"Bren is my go-to guy for conversion tracking, data analytics and GTM set up. I've had some pretty complicated issues with my client's tracking, and he has always managed to solve the problem and set it up for success. Very skilled in all areas of digital marketing, CRO, PPC, etc."

Megan K.

Digital Marketing Agency Owner

via Google
"Brendan's been working on my project for the last three years. He is an incredible value — self-motivated, honest, and very hard working. He is so good that I've recommended him to two other people who use him regularly. I could not rate him higher."

3-Year Retainer Client

via Upwork
"Bren taught me everything I know about Google Ads. I have been working with him for over 5 years. He is a digital marketing expert. I still work with him to this day!"

Eric S.

5+ Year Client

via Google
"This project was a clinic. A demonstration of deep consulting skills, blazing fast execution and brilliant mastery of the technology. One competing offer estimated 5 hours of labour. Brendan needed one hour. If you have GTM and Google Analytics requirements, just go see Brendan."

Verified Client

GTM & GA4 Project

via Upwork
"Great work with conversion implementation in Google Analytics and Google Tag Manager. Extra Large Marketing made things simple, asked the right questions and implemented. It's amazing how much simpler they've made conversion implementation."

Jason K.

Agency Director

via Google
"Hands down the most knowledgeable AdWords expert I have ever had the pleasure of working with. We will be working with Bren for as long as he can stand us! He is an invaluable member of our team."

Long-term Ads Client

via Upwork
"He's easily understood the goals of our business and helped reach them by adding solid tracking to our website. Both his work and his communication are professional, effective and efficient. An absolute joy to work with."

Verified Client

Conversion Tracking Project

via Google
"Brendan 100% understands setting up dashboards in Data Studio. We now have two great dashboards which I can maintain myself — I can see the lifetime value, the upsells and throughsells. Recommend."

Agency Owner

Looker Studio Dashboards

via Upwork
"I have used ELM for over a year and cannot recommend them more highly. They are honest and very judicious from a money perspective. Over half the good ideas come from them — they're constantly looking at ways to help me and expand the reach of the business."

Ripduman S.

1+ Year Client

via Google
Brendan Andrew Chase — AI Agent Developer

About the Developer

Brendan Andrew Chase

Builder of AI agent systems and automation frameworks with a background in LLM orchestration, tool use, and production-grade agent deployment. 10+ years in digital marketing and technology, now focused on AI-first business automation. Founder of Extra Large Marketing Digital, based in Rio de Janeiro.