Nate Castillo

Let's Build

Nate Castillo

Let's Build

GTM Engineer

Compound with AI

Compound with AI

A builder who sells and a seller who builds. Bridging the gap between what teams ship and the revenue they should generate.

A builder who sells and a seller who builds. Bridging the gap between what teams ship and the revenue they should generate.

Start the Conversation

Start the Conversation

About

Builder. Seller. Operator.

Builder. Seller. Operator.

GTM Engineer for AI and fintech companies

GTM Engineer for AI and fintech companies

GTM Engineer for AI and fintech companies

Nate Castillo

Southern California

GTM Engineer

user pic

Background

I've built products from zero, sold them into enterprise, and operated the revenue engine in between. As a VC-backed founder in AI, Bitcoin, and fintech I've lived on both sides of the builder-seller gap that kills most startups.

I work with Seed-to-Series C founders who've built something real but need to build the commercial motion to compound the business. I help them architect the bridge between their product and a repeatable revenue engine while using AI where it creates leverage and human judgment where it still matters.

Start the Conversation

Start the Conversation

PROBLEM

AI makes building easier but GTM is still where startups die

AI makes building easier but GTM is still where startups die

Most startups don't die because the product didn't work. They die because the revenue engine never compounded. AI has made building cheaper and faster, but the gap between a working product and a repeatable GTM motion is still wide, still expensive, and still where momentum stalls. That's the problem I'm built to solve.

Most startups don't die because the product didn't work. They die because the revenue engine never compounded. AI has made building cheaper and faster, but the gap between a working product and a repeatable GTM motion is still wide, still expensive, and still where momentum stalls. That's the problem I'm built to solve.

SOLUTION

GTM Engineering aligned to deliver outcomes

GTM Engineering aligned to deliver outcomes

Close the gap between what gets shipped and the revenue it should generate.

Close the gap between what gets shipped and the revenue it should generate.

Revenue Signal Detection

Identify exactly where your product's revenue motion is breaking.

Revenue Signal Detection

Identify exactly where your product's revenue motion is breaking.

Outcome-Aligned Execution

Every engagement is structured around measurable revenue milestones.

Outcome-Aligned Execution

Every engagement is structured around measurable revenue milestones.

Agentic Revenue Systems

AI-native systems that run the revenue motion with your data.

Agentic Revenue Systems

AI-native systems that run the revenue motion with your data.

CAPABILITIES

Translate AI capability into compounding outcomes

Translate AI capability into compounding outcomes

From field-tested GTM motions to agentic systems built from scratch

From field-tested GTM motions to agentic systems built from scratch

Research anything...

Research

Software & App Industry

UX & UI Design Industry

High Converting Customer

GTM Intelligence

Live feed into your TAM, where deals are, where they're stalling, and what the forecast actually says. All built on your AI stack and workflow.

Research anything...

Research

Software & App Industry

UX & UI Design Industry

High Converting Customer

GTM Intelligence

Live feed into your TAM, where deals are, where they're stalling, and what the forecast actually says. All built on your AI stack and workflow.

Research anything...

Research

Software & App Industry

UX & UI Design Industry

High Converting Customer

GTM Intelligence

Live feed into your TAM, where deals are, where they're stalling, and what the forecast actually says. All built on your AI stack and workflow.

Code

1

2

3

4

5

class AutomationAgent:
def __init__(self, activation_limit):
self.activation_limit = activation_limit
self.current_mode = "idle"

def evaluate_task(self, workload_value):
if workload_value > self.activation_limit:
self.current_mode = "engaged"
return "Automation agent has been successfully activated!"
else:
return "No activation needed. Agent stays idle."
def get_current_mode(self):
return f"Current operational mode: {self.current_mode}"

Rapid Agent Development

Integrate agents with your tools and automate the workflows your team keeps doing manually.

Code

1

2

3

4

5

class AutomationAgent:
def __init__(self, activation_limit):
self.activation_limit = activation_limit
self.current_mode = "idle"

def evaluate_task(self, workload_value):
if workload_value > self.activation_limit:
self.current_mode = "engaged"
return "Automation agent has been successfully activated!"
else:
return "No activation needed. Agent stays idle."
def get_current_mode(self):
return f"Current operational mode: {self.current_mode}"

Rapid Agent Development

Integrate agents with your tools and automate the workflows your team keeps doing manually.

Code

1

2

3

4

5

class AutomationAgent:
def __init__(self, activation_limit):
self.activation_limit = activation_limit
self.current_mode = "idle"

def evaluate_task(self, workload_value):
if workload_value > self.activation_limit:
self.current_mode = "engaged"
return "Automation agent has been successfully activated!"
else:
return "No activation needed. Agent stays idle."
def get_current_mode(self):
return f"Current operational mode: {self.current_mode}"

Rapid Agent Development

Integrate agents with your tools and automate the workflows your team keeps doing manually.

Agentic Revenue Systems

Automate outreach, qualify pipeline, forecast loops, and predict churn. All your data and your revenue motion.

Agentic Revenue Systems

Automate outreach, qualify pipeline, forecast loops, and predict churn. All your data and your revenue motion.

Agentic Revenue Systems

Automate outreach, qualify pipeline, forecast loops, and predict churn. All your data and your revenue motion.

PROCESS

Three steps to a revenue engine that compounds

Three steps to a revenue engine that compounds

Locked in process. Outcome oriented execution. No vague decks or bloated retainers.

Locked in process. Outcome oriented execution. No vague decks or bloated retainers.

STEP 1

STEP 2

STEP 3

03

Agentic Revenue Operations

The compound stage. Once your revenue architecture is in place, we deploy AI-native systems that operate the motion autonomously. Create leverage with agentic pipelines, intelligent forecasting, automated demand generation, and continuous optimization. It's a performance partnership structured around growth, not billables. We win together.

STEP 1

STEP 2

STEP 3

03

Agentic Revenue Operations

The compound stage. Once your revenue architecture is in place, we deploy AI-native systems that operate the motion autonomously. Create leverage with agentic pipelines, intelligent forecasting, automated demand generation, and continuous optimization. It's a performance partnership structured around growth, not billables. We win together.

PROOF OF WORK

Results that compound

Results that compound

Different stages have different problems and milestones. Same outcome. AI capability turned into measurable revenue.

Different stages have different problems and milestones. Same outcome. AI capability turned into measurable revenue.

$8M pipeline. 90 days.

Two failed attempts at west coast enterprise. I rebuilt the GTM from the ground up — strategy, ICP, messaging, pipeline ops — and turned it into $11M in pipeline in 90 days.

$

0

M

New enterprise pipeline

AI Powered Fraud Fighters

Emily, the CEO of BloomTech, transformed their marketing efforts using AI-powered tools. This shift resulted in a 60% increase in ROI and a 45% improvement in customer personalization, leading to a surge in brand loyalty

$

0

M

growth in sales

Sophia's Retail Breakthrough

Sophia, the marketing lead at Trendify, used AI-driven analytics to dive deep into customer behavior. The insights led to a 40% increase in engagement and a 30% rise in repeat purchases, creating long-term customer relationships.

$

0

M

gain in retention

"If you've tried to break into a market and stalled, the problem is rarely the product. It's the commercial motion."

$8M pipeline. 90 days.

Two failed attempts at west coast enterprise. I rebuilt the GTM from the ground up — strategy, ICP, messaging, pipeline ops — and turned it into $11M in pipeline in 90 days.

$

0

M

New enterprise pipeline

AI Powered Fraud Fighters

Emily, the CEO of BloomTech, transformed their marketing efforts using AI-powered tools. This shift resulted in a 60% increase in ROI and a 45% improvement in customer personalization, leading to a surge in brand loyalty

$

0

M

growth in sales

Sophia's Retail Breakthrough

Sophia, the marketing lead at Trendify, used AI-driven analytics to dive deep into customer behavior. The insights led to a 40% increase in engagement and a 30% rise in repeat purchases, creating long-term customer relationships.

$

0

M

gain in retention

"If you've tried to break into a market and stalled, the problem is rarely the product. It's the commercial motion."

$8M pipeline. 90 days.

Two failed attempts at west coast enterprise. I rebuilt the GTM from the ground up — strategy, ICP, messaging, pipeline ops — and turned it into $11M in pipeline in 90 days.

$

0

M

New enterprise pipeline

No ICP. No Pipeline. No Playbook. $2M ARR.

No pipeline. No playbook. I built the entire revenue system from the ground up alongside the co-founders. From ICP, messaging, outreach, and close. The first enterprise contract didn't happen because the product got better. It happened because the commercial motion finally existed.

$

0

M

ARR

Zero -> One

Took a corporate treasury AI tool from zero to funded. Built the narrative, ICP, and commercial foundation from scratch. Closed Pre-seed through Seed with institutional VC and a leading accelerator. The product was early. The GTM wasn' and that's what got it done.

$

0

M

Sales pipeline generated

Let's Build!

Are you ready to start compounding with AI?

Start the Conversation

© 2026 Nate Castillo

Let's Build!

Are you ready to start compounding with AI?

Start the Conversation

© 2026 Nate Castillo

Let's Build!

Are you ready to start compounding with AI?

Start the Conversation

© 2026 Nate Castillo