What does David Gadyan do?

David Gadyan is a data scientist, agentic AI developer and AI marketing specialist with 8 years of experience and 180+ delivered projects. He builds AI and machine learning systems that reach production - agentic workflows, RAG pipelines, computer vision, forecasting and full-stack data applications - and sets up the analytics and conversion tracking that prove those systems moved a business number.

What services do you offer?

Nine core services: generative AI and agentic systems, machine learning, deep learning, computer vision, web development, web scraping, database management, software development, and MLOps/DevOps. On the marketing side: GA4 and conversion tracking setup, tracking audits, marketing analytics and AI automation for lead handling.

How much does a project cost?

It depends entirely on scope, so there is no list price. Small, well-defined pieces of work - a tracking audit, a scraper, a proof-of-concept agent - are typically a few days. Production systems are scoped as projects with milestones. The fastest way to a real number is a 15-minute call: describe the problem and you will get an honest range, including whether it is worth doing at all.

How long does a project take?

A proof of concept is usually one to two weeks. A production deployment - model, API, monitoring and handover - is typically four to eight weeks depending on data readiness. Audits and tracking fixes are measured in days, not weeks. Data access is almost always the thing that decides the timeline, not the modelling.

What technologies do you work with?

Python, R, JavaScript and SQL as core languages. For AI: LangChain, LangGraph, RAG architectures with vector stores such as Pinecone, and the major LLM APIs. For interfaces: React, Next.js, React Native and Python Dash. For serving: Flask and FastAPI REST APIs. For operations: DevOps/MLOps on cloud infrastructure including AWS, with models deployed and monitored in live environments.

Can you build an AI agent or chatbot for my business?

Yes - this is the core of the current work. That includes retrieval-augmented generation over your own documents, multi-step agents that take actions rather than just answer, workflow automation with tools such as n8n, and customer-facing assistants. The chat window you are reading right now is a small example.

Why is my Google Analytics not recording any conversions?

Usually one of three causes. The measurement ID on the site does not match the property you are reading. Or the event fires but was never marked as a key event in GA4, so it is stored and never counted. Or the conversion happens off your domain - a form that posts to a third party and lands the visitor on someone else's thank-you page - so no pageview of yours ever records it. All three are quick to diagnose and quick to fix.

Do you offer a tracking or analytics audit?

Yes. The audit checks whether every enquiry path on your site produces a countable event, whether your key events are actually marked as conversions, what your page weight is costing you in paid traffic, and what search engines and AI assistants currently say you do. You get findings ranked by payoff per hour, each with a free way to verify it yourself.

Who have you worked with?

180+ projects and 50+ long-term clients, including SecondSight, Equeum, Greenwich.HR, Chilldays, KPMG, ScanLabMR, Arnotts Technology Lawyers, Happe Homes and FCL Analytics. Backgrounds span the Barcelona School of Economics (Data Science for Decision Making), a PMBA in Data Science, and time at Ernst & Young. Client reviews are on the testimonials section of this page.

How do we start working together?

Book a 15-minute call using the booking section on this page, or send a message through the contact form. Bring the problem rather than a specification - a model that will not ship, a pipeline that keeps breaking, numbers that do not reconcile - and you will get a straight answer on whether it is worth solving and roughly what it would take.

Do you work remotely and across time zones?

Yes - all work is remote and has been for eight years, with clients across the US, UK, Europe, Australia and the Middle East. Clients consistently mention clear asynchronous communication and regular written updates, which is what makes the time-zone gap a non-issue.

Do I own the code and the models you build?

Yes. You own the deliverables outright on final payment, including source code, models and documentation. NDAs are signed as a matter of course, and handover includes whatever your team needs to run and maintain the system without further involvement.

What happens on the call?

Fifteen minutes, no charge, no pitch. You describe the problem - a model that will not ship, a pipeline that keeps breaking, numbers that do not reconcile - and you get a straight answer on whether it is worth solving, roughly what it would take, and whether David is the right person for it. If he is not, he will say so. Bring the problem rather than a specification.

David Gadyan — Data Scientist & Agentic AI Developer

I’m David Gadyan

Data Scientist AI Engineer AI Architect Agentic Systems Generative AI Developer Full Stack Developer Machine Learning Engineer Deep Learning Engineer Computer Vision Engineer AI Marketing

HIRE ME

KNOW MORE
ABOUT ME

Welcome! I’m David, a seasoned Data Scientist & Agentic AI Developer with over 8 years of experience and a track record of 180+ successful projects. My expertise lies in transforming complex business challenges into innovative solutions powered by AI and my creative problem-solving skills.

What I Bring to the Table:

Comprehensive AI Solutions: Whether you need to validate a business idea with a robust MVP or enhance your existing services and ERP systems, I specialize in delivering tailored AI solutions that drive success.

Diverse Skill Set:

Agentic AI Developer
Machine Learning & Deep Learning
Generative AI
Computer Vision
Full Stack Development
Web Scraping
Data Engineering
UI/UX Design
AI Marketing
DevOps/MLOps/LLMOps
Data Visualizations

Technical Proficiency:

Programming Languages: Python, R, Javascript, SQL

UI/UX Development: Utilizing frameworks like React, Next.js, React Native, and Python’s Dash

Deployment & Operations: Mastery in DevOps/MLOps, focusing on deploying Machine Learning and Deep Learning models into production environments. Expertise in creating REST APIs with Python’s Flask and FastAPI for seamless integration on cloud-based or traditional web servers.

Why Work With Me?

I am dedicated to contributing to your projects in a way that ensures mutual success. My strategic approach not only addresses immediate business needs but also positions your projects for long-term growth and innovation.

If you’re looking to leverage cutting-edge AI technologies to elevate your business, let’s connect and turn your vision into reality. Trust in my proven expertise to navigate the complexities of your data science journey.

DOWNLOAD MY CV

TESTIMONIALS

Reuben Vandeventer

CEO | Founder, SecondSight

Our team has been using Upwork since it began, and amongst us have engaged hundreds of freelancers. David is by far the most talented freelancer we’ve ever worked with. He has the perfect balance of technical competence, ability to quickly learn new things, and creativity to design elegant solutions to complex requirements. This particular project spanned across not only python and D3 challenges but the implementation of complex mathematic methods taken from algebraic topology, graph theory, and some of the more esoteric nuances of machine learning. Our team will definitely use David again on future projects.

Jake Happe

President, Happe Homes

David did an outstanding job designing an AI program for me. His technical expertise was evident from day one, and he quickly grasped the requirements of the project. David was not only highly skilled but also communicative, proactive, and committed to delivering high-quality results. He kept me updated throughout the entire process and went above and beyond to ensure the final product exceeded my expectations. I highly recommend David to anyone in need of an AI solution, you won’t be disappointed!

Isabel Gonzalez

CEO, Equeum

David took up a difficult and experimental initiative focusing on a highly domain specific application with verve. We were very impressed with his ability to work independently, to present findings, and to manage the research, development, and deployment pipeline end to end for a large and complex dataset. He is excellent about communicating the rationale behind his decisions in the context of data analysis, especially given the asynchronous nature of remote work. David: Kudos! Thanks for your contribution, and we look forward to working with you again in the future!

Kevin Dorry

CEO | Lolly

David was a pleasure to work with. He came into a difficult situation and made the best of it!

David Imrem

CPO, SecondSight

David has been an incredibly valuable resource to my R&D team to explore a use case that we’ve been working on for many years. The area of focus for our use case involved algebraic topology and graph theory to be used for high-dimensional feature discovery and analysis. The process our team used with David was to guide particular math challenges that we understood from an abstract standpoint but needed a prototype that resulted in either data frames or working visuals to which we could provide additional guidance. This process resulted in a very loosely defined framework that David had to adapt. As a data science company, we have observed in the many other data scientists that we attempted to use before David for this same project that the loose definition of requirements is counter to the typical workflow of data science and, even more broadly speaking, engineering. David proved he had the skills and abilities to help us define what requirements should be as we progressed through the project together.

Alan Arnott

Managing Partner, Arnotts Technology Lawyers

David is an excellent freelancer, very easy to talk to and highly efficient and engaged

Aras

Financial Analyst, KPMG

David was amazing to work with, he was very professional, knowledgeable and a great communicator. We will definitely hire him again.

Rania Kabbara

Chief Financial Officer, linkaX

David was very professional, helpful and very skilled! Will certainly work with him again. Highly recommended

Joerg Twachtmann

Managing Partner, FCL Analytics GmbH

David is an ambitious, conscientious and reliable partner. He incorporated his own ideas into the project, which helped us a lot as non-technicians. If we find clients who would like to work with us, we will be happy to continue working with David. Thank you very much for the trusting cooperation.

Andrea Graziano

Director of Operations, ScanLabMR

David was fantastic to work with! He was excellent at communicating with our team and making sure that every task was done to meet our deadlines. He was innovative and always had alternative ideas to offer if needed. We will definitely work with David again should another project come up.

Cary Sparrow

CEO, Greenwich.HR

David does outstanding work, is excellent at communicating and keeping us informed, and is a proactive thinker. He understands the objectives and not just the tasks, and is collaborative to optimize the approach he takes to best meet the objective. For this project, we tapped into his strong expertise in web scraping methods and database operations. We absolutely plan to be working with David in the future and can highly recommend.

Felix Forsgren

Co-Founder, LoopLabz.com

Had a great experience working with David.

Jacqueline McShan

Data Science Research

David was essential in helping me debug and deploy my website.He is very knowledgeable and skilled with setting up projects using AWS infrastructure. David clearly communicated with me in a timely matter if there were issues or questions concerning the project. I would definitely recommend working with David and I will most likely have more jobs for him as my website continues to evolve.

Rostislav Pankratov

Founder | NLOAI

I’m thrilled to share my positive experience working with David. His professionalism, dedication, and quality of work exceeded my expectations. Communication was clear and prompt, and he delivered exceptional results within the agreed timeframe. I highly recommend David and look forward to collaborating with him again in the future.

Federico Rossi

Founder | Chilldays

David’s skills in production are top-notch. He’s got a real knack for bringing AI models into the real world, ensuring they perform seamlessly in live environments. His work has been key to the app’s success, making it not just functional but also reliable and efficient for everyday users. He’s a wizard at making sure everything runs smoothly, from the backend to the user interface, which speaks volumes about his expertise in production.

I’m David Gadyan