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Fiverr Pro
English
$
USD
I will build custom ai agents with n8n, vapi, crewai and langchain
Preston Zen
Level 2
5.0
5.0
Gig Summary
What people loved about this freelancer
peterloehfelm
United States
Preston is one of those rare "golden nuggets" found in today's noisy technical world. He has all the needed background skills and has honed them in impressive...
bluerock606
Australia
I am absolutely blown away by the quality and professionalism of this service! From start to finish, the entire experience was seamless and impressive. The...
juulrbv
Netherlands
Preston Zen truly SHINES in AI Development! With flawless professionalism, he exceeded expectations, delivering top-tier work while maintaining quick responsiveness....
apodeictic
United States
Super helpful. Exactly what I was looking for. Opened up a lot of paths for me to continue my own work. Really appreciate the context given, which was the exactly...
About this gig
Custom AI Agents That Actually Do the Work Not Just Chat
I'm Preston, a full-stack AI developer from the SF Bay Area. Most "AI agents" are glorified chatbots. I build agents that take real action: fetch data, make decisions, talk to your users, and run across your tools without babysitting.
I build with: n8n, Vapi, Zapier, Relevance AI, CrewAI, LangChain, and custom Python the right tool for your scale and budget.
Agents I ship: Intelligent chatbots & support agents Human-like voice agents (Vapi) CRM, Notion, Airtable & API integrations Multi-agent reasoning (CrewAI / LangChain) Lead-gen, internal ops & fully custom systems
Lead-gen agent, support bot, ops automation, or something no one's built yet I've got you.
As an OSCP-certified engineer and DEFCON speaker, I build security in from line one, so your data and integrations are handled right. I ship clean, production-ready systems fast.
Let's turn your AI idea into something that runs itself.
Message me with what you're building and I'll tell you exactly how to make it happen.
How it works
Here are the steps to complete your Basic package project:
- 1
Video meetup We'll meet up by a video call to discuss your project face-to-face.
- 2
Research I map out your needs, learn about your application, and prepare a design for your application.
- 3
Design concept I'll design a concept for your app, which we can then develop together.
- 4
App spec I'll write specifications for the app's functionality and features.
- 5
First draft You'll get a first outline of the delivery to see how it aligns with your vision.
- 6
Development I'll develop the app and deliver a working product for your review.
- 7
Progress check We'll meet to review the status of the project and the steps required to complete it.
- 8
Final design I'll deliver the final design of the website/ app for your approval.
- 9
Final review I'll deliver the final version of the website or app for your review.
- 10
Delivery The delivery of the application.
Get to know Preston Zen
Preston Zen
Adaptive applications of the future
Level 2
- FromUnited States
- Member sinceMar 2018
- Avg. response time1 hour
- Last delivery6 months
Languages
English
Preston Zen | Multi-DEFCON Speaker | OSCP & OSCE3 Certified
Silicon Valley-trained Solution Architect (Y Combinator & SIBR) with secure engineering built into everything I ship. I find problems and fix them.
I build automations across deep code and no-code (N8N, OpenClaw) for legal, healthcare, marketing, and logistics. Marketing: content clipping/editing automation with custom templates. AI work: computer vision, LLMs, audio, model training. Also 3D CAD & electronic design—prototyped in Shenzhen, deployed worldwide.
MVP to scale: helped companies reach $10M+ ARR.
My Portfolio
Other Software Development Services I Offer
FAQ
What's the difference between the Basic, Standard, and Premium packages?
Basic is a curated agent for one defined task on a single platform. Standard is a fully custom agent with your logic and integrations. Premium is a Python multi-agent system with memory and reasoning. Not sure? Message me and I'll scope it.
Do I need my own API keys (OpenAI, CRM)?
Ideally yes — you'll own the agent and its usage costs. Not set up? I'll guide you or set it up as an add-on. API costs (e.g. OpenAI tokens) bill to your own account, separate from my fee.
Can it connect to my existing tools?
Almost certainly. I integrate with CRMs, Notion, Airtable, Google Workspace, Slack, webhooks, and most APIs. Tell me your stack and I'll confirm before you order.
Can I run and edit it myself after?
Yes. I deliver clean, documented systems. Add the Documentation extra (or go Premium) for a full walkthrough, plus post-launch support so you're never stuck.
Is my data secure?
Yes — I'm OSCP-certified and build with security in mind. I'll sign an NDA before touching anything sensitive.
How do we start?
Message me first with what you're building. I'll confirm scope, recommend the right package, then you order with confidence.
Reviews
12 reviews for this Gig
| (11) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
P peterloehfelm
United States
Preston is one of those rare "golden nuggets" found in today's noisy technical world. He has all the needed background skills and has honed them in impressive locations around the globe. We highly recommend him if you want technology support at the highest level out there. Preston and his team are...
$100-$200
Price
5 days
Duration
Helpful?B bluerock606
Australia
I am absolutely blown away by the quality and professionalism of this service! From start to finish, the entire experience was seamless and impressive. The AI agent delivered was exactly what I needed and more. The seller demonstrated deep technical expertise and took the time to understand my specific...
$200-$400
Price
4 days
Duration
Helpful?M mariocastejon
Mexico
Made my project come to life, he had a very clear communication and helped me understand along the way.
$50-$100
Price
11 days
Duration
Helpful?J juulrbv
Netherlands
Ongoing collaborationPreston Zen truly SHINES in AI Development! With flawless professionalism, he exceeded expectations, delivering top-tier work while maintaining quick responsiveness. Collaborating with him was a joy as he went above and beyond, making the project experience seamless and enjoyable. 👏
$800-$1,000
Price
7 weeks
Duration
Helpful?A apodeictic
United States
Super helpful. Exactly what I was looking for. Opened up a lot of paths for me to continue my own work. Really appreciate the context given, which was the exactly why I wanted to talk to a real person vs. just trying to find the answers on my own.
$50-$100
Price
3 days
Duration
Helpful?
Reviews
12 reviews for this Gig
| (11) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
P peterloehfelm
United States
Preston is one of those rare "golden nuggets" found in today's noisy technical world. He has all the needed background skills and has honed them in impressive locations around the globe. We highly recommend him if you want technology support at the highest level out there. Preston and his team are...
$100-$200
Price
5 days
Duration
Helpful?B bluerock606
Australia
I am absolutely blown away by the quality and professionalism of this service! From start to finish, the entire experience was seamless and impressive. The AI agent delivered was exactly what I needed and more. The seller demonstrated deep technical expertise and took the time to understand my specific...
$200-$400
Price
4 days
Duration
Helpful?M mariocastejon
Mexico
Made my project come to life, he had a very clear communication and helped me understand along the way.
$50-$100
Price
11 days
Duration
Helpful?J juulrbv
Netherlands
Ongoing collaborationPreston Zen truly SHINES in AI Development! With flawless professionalism, he exceeded expectations, delivering top-tier work while maintaining quick responsiveness. Collaborating with him was a joy as he went above and beyond, making the project experience seamless and enjoyable. 👏
$800-$1,000
Price
7 weeks
Duration
Helpful?A apodeictic
United States
Super helpful. Exactly what I was looking for. Opened up a lot of paths for me to continue my own work. Really appreciate the context given, which was the exactly why I wanted to talk to a real person vs. just trying to find the answers on my own.
$50-$100
Price
3 days
Duration
Helpful?
