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Platon H.

AI / ML Engineer

Verified expert

Platon H.

AI / ML Engineer

Verified expert

middle

Ukraine

$35/hour

English – Advanced

Top skills

Python FastAPI AI LangChain RAG PostgreSQL Redis Docker Celery Elasticsearch

Meet Platon ✨

A Backend Developer and AI/ML Engineer with four years of experience building scalable SaaS platforms and AI-powered production systems. Platon specializes in Python backend architecture designed for high load, asynchronous workflows, and complex integrations, with hands-on expertise in modern AI tools including OpenAI, LangChain, Whisper, and RAG pipelines.

His strongest work includes an automated voice verification platform that handles outbound VoIP calls with real-time AI conversation, IVR navigation, and RAG-based context retrieval during live calls, as well as a sales intelligence platform combining AI content analysis, CRM synchronization, and LinkedIn-based contact discovery. He has also architected the backend for a large-scale European information portal serving over 15 million dynamically generated pages.

Platon covers the full AI pipeline from data ingestion and voice processing to real-time LLM responses integrated into backend services. He combines that AI depth with strong traditional backend skills including async programming, database optimization, Elasticsearch, Celery task queues, and production monitoring with Sentry.

If your product needs someone who can build intelligent backend systems that combine voice AI, data pipelines, and scalable architecture into one production-ready platform, Platon brings the engineering depth to make it work 🚀

Download the CV

Hard skills

Python

SQL

FastAPI

SQLAlchemy

Alembic

Pydantic

Numpy

Pandas

Celery

AIOHTTP

Async Programming

BeautifulSoup

Selenium

Playwright

Jinja2

PyPDF

WeasyPrint

PyVoIP

Socket.IO

OpenAI API

Groq API

LangChain

Whisper

ElevenLabs

Ollama

RAG Pipelines

NLTK

pgvector

PostgreSQL

MySQL

SQLite

MongoDB

Elasticsearch

Redis

Docker

Docker Compose

AWS

Heroku

Nginx

REST API Development

Software Architecture

Technical Documentation

Tools

Git

GitHub

GitLab

GitHub Actions

Postman

Pytest

Unittest

Mock

Sentry

PyCharm

n8n

Asterisk

ffmpeg

FunASR

SMTP

Stripe

Soft skills

Architectural thinking

Problem solving

Ownership

Reliability

Communication

Adaptability

Attention to detail

Production mindset

AI Voice Agent: Automated Voice Verification Platform

Backend Developer | AI/ML Engineer

Duration:

1 year

Domains:

AI/ML VoIP Telephony Automation Lead Verification

Project Description:

Built the backend for an AI-powered voice verification platform that autonomously makes outbound VoIP calls, navigates IVR menus, detects voicemails, and conducts natural conversations to verify contact information at scale. Implemented a RAG system using pgvector for real-time context retrieval during live calls, integrated Whisper and Groq for speech-to-text and LLM response generation, and built audio processing pipelines with ffmpeg and FunASR.

Tools & Technologies:

Python, FastAPI, SQLAlchemy, Alembic, PostgreSQL, pgvector, Celery, Redis, Asterisk, Whisper, ElevenLabs, Groq API, Ollama, ffmpeg, FunASR, Docker

AI-Powered Sales Intelligence Platform

Backend Developer

Duration:

1 year

Domains:

Sales Intelligence AI/ML CRM Integration Data Analytics

Project Description:

Developed the complete backend for a sales intelligence platform that helps teams identify potential buying committee members within target companies. Built AI-powered content analysis workflows, web scraping pipelines with Playwright, CRM integrations with Salesforce and HubSpot, NLP-based contact analysis using NLTK, and automated LinkedIn contact discovery through external APIs.

Tools & Technologies:

Python, FastAPI, Playwright, pypdf, aiohttp, SQLAlchemy, Alembic, PostgreSQL, Pandas, Sentry, NLTK, SMTP, Jinja2

European Information Portal

Backend Developer

Duration:

2 years

Domains:

Web Development

Project Description:

Designed and maintained the scalable backend architecture for a large-scale information portal containing over 15 million dynamically generated pages about European companies and executives. Implemented advanced search and filtering with Elasticsearch, optimized PostgreSQL queries for large datasets, built async data pipelines, automated PDF generation, and integrated Stripe payments and 10+ external APIs for legal data enrichment.