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I deliver real business results with
production AI systems.

Senior ML Engineer with 5+ years shipping machine learning, NLP, and computer vision solutions – from 0-to-1 builds for startups to large-scale pipelines processing millions of records. Based in Paris.

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5+ Years in ML
60+ Published Articles
4x Hackathon Winner
3.7K+ Blog Followers
Vyacheslav Efimov
Big Data LLMs Computer Vision NLP
What I Deliver

AI Solutions That Ship

End-to-end – from prototype to production. I handle the ML, the backend, the deployment, and everything in between.

Machine Learning Pipelines

Classification, regression, recommendation systems, and optimization models – built for scale. From feature engineering to model serving.

  • Prediction models processing millions of transactions
  • Credit scoring on 4M+ client datasets
  • Recommendation engines with price optimization
PyTorchScikit-LearnLightGBMPySparkOptuna

NLP & LLM Applications

RAG systems, AI agents, information retrieval, text classification, and code generation – leveraging the latest in large language models.

  • RAG pipelines with LangChain & FAISS
  • Intent classification at scale (100+ classes)
  • AI agents for task automation
LangChainLangGraphHuggingFaceFAISSMCP

Computer Vision Systems

Object detection, image segmentation, classification, OCR, and camera calibration – full-stack, from model training to cloud deployment.

  • Industrial image segmentation (microscopic analysis)
  • Multi-model detection & classification pipelines
  • End-to-end CV apps deployed on AWS
YOLOSAM-2U-NetOpenCVCLIP
Proven Track Record

Projects & Results

Real problems solved for real companies – from health-tech startups to the largest bank in Eastern Europe.

Aspect Health
Health-Tech Startup · USA

AI-Powered Meal Generation Engine

Challenge

Build a production-ready AI recommendation service from scratch – personalized meal plans with cost optimization.

Solution

Designed and shipped the entire system 0 → 1: generative AI engine combining LLMs and image generation with integrated price optimization algorithms.

✓ Production-ready in 5 months
✓ Reduced meal plan costs
Leveraize
AI Consulting · France

Industrial Image Segmentation Platform

Challenge

French industrial clients needed automated microscopic metal analysis – replacing slow, manual visual inspection processes.

Solution

Delivered a full-stack application using U-Net for image segmentation – built the ML model, FastAPI backend, and DevOps pipeline, deployed end-to-end on AWS.

✓ Full-stack delivery (ML + Backend + DevOps)
✓ Deployed on AWS
Sberbank
Largest Bank in Eastern Europe · Russia

NLP-Powered Banking Recommendation System

Challenge

Classify user intents across ~100 categories on 800K+ entries to power the mobile banking recommendation engine.

Solution

Built the NLP classification model, plus scalable payment prediction pipelines processing tens of millions of transactions with PySpark on HDFS. Developed ETL pipelines handling 2000+ GB of data.

✓ 800K+ entries classified
✓ 2000+ GB data pipelines

Hackathon Track Record

Winner
24 Hours of Code AI agent for hotel automation
2nd
{Tech: Europe} AI roleplay language learning
3rd
Google Healthcare AI triage tool for nurses
3rd
Shift Hackathon AI alternate history game
What People Say

Trusted by Teams & Leaders

"He took full ownership of the project from development through production, applying his technical expertise to deliver high-quality results. Vyacheslav is highly proactive: he identifies problems, proposes solutions, and drives initiatives forward independently. I would gladly recommend him to anyone looking for strong technical capability, initiative, and reliability."

Kirill Markin
Kirill Markin
CTO | Ex-founder | Staff Software Engineer

"Working with Slava was a great experience! He had a rare ability to connect product vision with technical execution, understanding what was needed quickly and delivering solutions that often went beyond expectations. I always appreciated how clearly he explained complex technical topics in simple terms, making collaboration smooth for everyone. I would recommend him to any product-driven AI team without hesitation."

Emiliia Bodiu
Emiliia Bodiu
Head of Product at Aspect Health

"He owned the meal generation engine from 0 to 1, shipping a production-ready system with LLMs, image generation, and price optimization in remarkably little time. His ML depth is rare: he moves fast without cutting corners. Any team that gets Slava gets someone who can both build serious ML systems and ship them to production at startup speed."

Evgenii Zhukov
Evgenii Zhukov
Senior Full-Stack Engineer
Thought Leadership

60+ Articles on Towards Data Science

I don't just build ML systems – I teach how they work. 3.7K+ followers read my deep-dive series on the topics below.

01

Reinforcement Learning

RL algorithms, policy gradients, Q-learning, and real-world applications of reward-based learning systems.

Read Series →
02

Similarity Search

Vector search, nearest neighbor algorithms, FAISS indexing, and embedding-based retrieval at scale.

Read Series →
03

Large Language Models

Transformer architectures, fine-tuning, RAG systems, and the mechanics behind modern LLMs.

Read Series →
04

Computer Vision

From classical image processing to YOLO, SAM, U-Net – segmentation pipelines in production.

Read Series →
Vyacheslav Efimov
About Me

The Person Behind the Code

Over the past 4 years, I've had the privilege of working across diverse industries – from large corporations processing millions of records to fast-moving startups building products from the ground up.

My expertise spans the full spectrum of machine learning: building predictive models and data pipelines for classic tabular problems, developing computer vision systems for real-world applications, and engineering NLP solutions powering the latest generative AI products.

Outside of work, I'm driven by a passion for sports and fitness and a love for languages – I speak several. Teaching is one of my deepest passions: with 60+ published articles on data science, I've found that explaining complex concepts to others not only sharpens my own understanding but also trains me to communicate technical ideas in simple, accessible terms – a skill that proves invaluable when working with non-technical stakeholders.

Let's Work Together

Have an AI project in mind?

Book a free 30-minute consultation. I'll assess your project, outline a technical approach, and give you an honest estimate – no strings attached.

Book a Free Consultation

Or send me a message

slavastack@gmail.com GitHub LinkedIn Medium Blog