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Svyatoslav K.

Offer Svyatoslav work on your next project.

Ukraine Ternopol, Ukraine
1 hour 4 minutes back
A little busy a little busy
4 Safes completed
1 month 11 days back
2 clients
1 proposal made
on the service 5 years

Rating

Successful projects
100%
Average rating
10 out of 10
Rating
1909
Python
69 place out of 4466
AI Content Creation 1
46 place out of 1544
4 projects
AI & Machine Learning
1 project
Python

Language proficiency level

English English: upper-intermediate
Polski Polski: pre-intermediate

CV

Up-to-date CV


I am a Data Science engineer with 2 years of commercial experience, specializing in natural language processing (NLP), large language models (LLMs), and AI-based chatbot systems. I have practical experience in fine-tuning open-source models, building RAG pipelines, and deploying secure, scalable ML applications on AWS. My stack includes LangChain, LangGraph, Hugging Face, and FastAPI, as well as in-depth knowledge of databases and MLOps tools. I work at the intersection of language and data, creating intelligent systems that are efficient, secure, and production-ready.


Technical Skills

Programming Languages

Python

RDBMS /DB

MySQL, PostgreSQL, SQLite, MongoDB

Operating Systems

Windows, Linux

Tools and Technologies

  • Data & ML Libraries: pandas, numpy, scipy, scikit-learn, tensorflow, keras, OpenCV, fuzzywuzzy, transformers, Scrapy

  • LLM & NLP: Hugging Face (PEFT, TRL, Trainer), LangChain, LangGraph, Ollama, OpenAI API (GPT models, Batch API), NER, POS, Semantic Similarity, Text Mining, LDA, Sequence-to-Sequence with Attention

  • MLOps & Deployment: Docker, FastAPI, Streamlit, Celery, Flask, AWS (S3, EC2, Lambda, ECR, SageMaker, API Gateway, DocumentDB), GitHub, Logging

  • Data Engineering: ETL pipelines, Batch APIs, Time Series Forecasting, Statistical Analysis, Data Management, Data Manipulation

  • Dev Tools: Jupyter Notebook, PyCharm, VScode, Jira, Confluence

Other

  • Machine Learning: 

    • Supervised (KNN, Linear/Logistic Regression, SVM, Decision Trees, Random Forest, XGBoost, Neural Networks)

    • Unsupervised (K-means, DBSCAN, Agglomerative Clustering, PCA)

  • Deep Learning: CNN, RNN, Transformers, Transfer Learning, Fine-tuning (including LoRA on small consumer GPUs)

  • NLP & LLM Engineering: Prompt Engineering, Fine-tuning LLaMA models with LoRA, Custom LangChain agents, Training LLMs using low-rank adaptation principles

  • Computer Vision: Image Classification, Object Detection, Image Recognition, OCR

Skills and abilities

Portfolio


  • RAG system for a Japanese financial institution

    AI & Machine Learning
    - Task: Develop an intelligent system for analyzing financial reports with zero hallucination levels for working with complex Japanese documentation.
    - Result: Implemented a "Gap Analysis" agent that detects low confidence in responses and redirects inquiries to experts. The system is fully scalable due to a microservices architecture on AWS.
    - Technologies: FastAPI, AWS Fargate, PostgreSQL (pgvector), Japanese NLP tokenization, LangChain.
  • Conversational AI: Personalized chat-bot (Persona Cloning)

    AI & Machine Learning
    - Task: Create an AI agent for Digital Media capable of imitating the unique communication style of the author (100% accuracy of persona) for automating chats with fans.
    - Result: The system supports 1000+ simultaneous real-time dialogues. The use of RAG and model fine-tuning has ensured the generation of responses that are indistinguishable from human ones.
    - Technologies: Fine-tuning (Mistral), LangChain, LangGraph, AWS (SageMaker, Lambda, ECR), FastAPI.
  • LegalTech: Intelligent scraping and structuring of data

    AI & Machine Learning
    - Task: Build a system for automatic data extraction from unstructured lawyer profiles and a scalable pipeline for scraping.
    - Result: Optimization of asynchronous parsers accelerated data collection by 200%. Implementation of OpenAI Batch API reduced text processing costs by 3 times while maintaining high accuracy.
    - Technologies: Python, Scrapy, Celery, OpenAI Batch API, Docker, MongoDB.
  • SQL Agent: Private database analytics (Text-to-SQL)

    AI & Machine Learning
    - Task: Create a secure system that allows users to retrieve data from PostgreSQL by asking questions in natural language (without knowledge of SQL).
    - Result: A local solution based on open models has been implemented, ensuring complete data privacy. An intuitive interface on Streamlit allows non-technical specialists to independently generate complex reports.
    - Technologies: LangChain Agents, LangGraph, Ollama (Open Source LLMs), PostgreSQL, Streamlit, Docker.
  • Voice AI agent for sales automation

    AI & Machine Learning
    - Task: Automate lead qualification using voice AI with minimal latency.
    - Result: Achieved real-time latency of less than 0.5 ms. Operational costs reduced by 30%, and lead conversion increased due to instant processing of requests.
    - Technologies: Twilio WebSockets, ElevenLabs (Voice Synthesis), OpenAI, FastAPI, AWS.
  • 45 USD

    Designs

    Web Design
    Design for Conditioner
  • 68 USD

    Prototype Site for Conditioner

    Web Design
    Website for the Conditioner. I performed in 3 days.
    The buyer is pleased

Reviews and compliments on completed projects 4

27 April 180 USD
Stage 2: Scaling and Automation

Quality
Professionalism
Cost
Contactability
Deadlines

Pleasant to collaborate
Very competent performer

30 January 361 USD
Stage 1: Core Prototype

Quality
Professionalism
Cost
Contactability
Deadlines

Great performer
Qualitatively and responsibly performs tasks
Pleasant to collaborate

21 July 2025 293 USD
1. AI Agenda: Queue system

Quality
Professionalism
Cost
Contactability
Deadlines

The project is completed according to the technical specifications

5 July 2025 270 USD
Personal Project

Quality
Professionalism
Cost
Contactability
Deadlines

The project was completed according to the technical specifications

Activity

  Projects underway 1
Stage 3: Integration (Telegram + Voice) Personal project
225 USD

  Latest proposals 10
OCR system Personal project
Stage 3: Integration (Telegram + Voice) Personal project
225 USD
Stage 2: Scaling and Automation Personal project
180 USD
Stage 2: Scaling and Automation Personal project
180 USD
Stage 1: Core Prototype Personal project
361 USD
Development of an AI agent (RAG) for the corporate knowledge base
496 USD
TheJob Personal project
Personal Project Personal project
158 USD
Module . Personal project
180 USD
1. AI Agenda: Queue system Personal project
293 USD