Sergo Medin

Profile

AI Analyst / AI Quality Analyst with 3+ years of cumulative professional experience across neural networks, machine learning and applied AI, backed by 10+ years in product analytics, experimentation and data-driven decision making. Over the past two years, I have focused on LLM systems, AI agents, RAG architectures and evaluation workflows. I help teams define and operationalize AI quality metrics, build evaluation frameworks, analyze model failures and improve system behavior through structured experimentation. Strong background in Python, SQL, AI evaluation, error analysis and retrieval systems.

Experience

Avito Real Estate

Remote

Team Lead, Sales Analytics

Nov 2023 — Present

  • Built and led a team of 7 analysts covering sales analytics across Avito Real Estate, while staying hands-on in high-impact AI, automation, and product analytics initiatives.
  • Built an OpenAI API-powered Telegram insight search service as a long-running Python service with a web interface; adoption spread across Avito verticals and unlocked at least $50K in incremental monthly revenue.
  • Shipped an internal Python web service on top of the Huntflow API that automated recruiter workflows and made post-event pipeline processing 80x faster (tinyurl.com/hr-accel-1, tinyurl.com/hr-accel-2).
  • Improved sales team efficiency by 15-25% through behavior analytics and increased paid conversion by 12% with RFM-based targeting; shared the approach publicly (tinyurl.com/avito-rfm).
  • Reduced ad-hoc workload by 20%, freed more than 10% of sales manager time, and translated a 2-year analytics strategy into quarterly OKRs.
  • Python
  • OpenAI API
  • Product Analytics
  • Automation
  • SQL

NDA

Remote

Support Copilot - AI Quality Lead

Sep 2025 — Mar 2026

  • Led discovery, rapid prototyping, and rollout architecture for a multilingual, multi-agent support copilot for a European furniture store: from a VM-hosted Python service to Google Cloud Run with Firestore and a Streamlit admin UI.
  • Built retrieval, self-check, and response workflows over a 15-20 document knowledge base, compared Qdrant and Google Cloud RAG Engine, and tuned reliability across 4 languages.
  • Built evaluation workflows with open-rag-eval and Google ADK Eval, including gold-answer checks, quality thresholds, and rollout gates for a live 3-4 person team, and freed about 15% of support time for sales.
  • Google ADK
  • Evaluation
  • Retrieval
  • Cloud Run
  • Qdrant

Independent Applied AI Projects

Remote

Spanish NLP Learning Pipeline

2025 — Present

  • Built a reproducible pipeline that turns Spanish driving-theory content into Anki decks using Python, spaCy-based analysis, Anki integration, and AI-generated card backs; it helped me learn ~1,500 words, reach 90-95% comprehension of exam wording, and pass both the theory and practical driving exams in Spain on the first attempt in Spanish (technical article, todoELE article, repository).
  • Python
  • spaCy
  • Anki
  • Web scraping
  • AI workflows

Yandex

Remote

Data Analyst → Team Lead

Sep 2016 — Oct 2023

  • At Yandex Market, built from scratch a metrics framework for Yandex Market’s overall organic visibility in Google Search, created an automated Python monitoring workflow for Yandex Market and competitors using multiprocessing and the Google PageSpeed API; one practical outcome was a 20% increase in Google organic traffic to Market reviews.
  • Led analytics in courier operations at Yandex Eats, cutting courier hiring costs by 50% and saving over $20K per month.
  • Improved courier app experience for roughly 10% of users by identifying pain points and validating changes through A/B and switchback experiments.
  • Built dashboards and forecasting tools used by dozens of managers and analysts to drive growth decisions, and later grew and mentored the analytics team through hiring, onboarding, and coaching.
  • Optimized data infrastructure, reducing query times by 10x and speeding up decision-making.
  • Applied machine-learning solutions in analytical and product work and built a revenue-attractiveness model used in production.
  • Python
  • Search quality
  • SQL
  • A/B testing
  • Team leadership

Earlier roles, teaching & publications

Russia / Remote

Selected highlights

2010 — 2021

  • SkillFactory (2020—2021): taught ~100 students in the Data Science program and organized hackathons and analytics meetups.
  • Published practical articles on workflow automation and internal tools, and co-authored a Nature Communications paper on biomarker development.
  • Earlier roles across BIOCAD and banking: led data and automation work, won Best Employee twice, and saved 12 hours per week through reporting automation.

    Education

    BSc & MSc in Fundamental Science: Technical Physics

    Moscow Bauman State Technical University

    2006 - 2012

    Thesis: Modeling of thermal and optical effects in a DNA amplifier.
    Portrait of Sergo Medin

    Skills

      • APPLIED AI & EVALUATION
      • AI evaluation
      • LLM (large language models)
      • RAG systems
      • AI agents
      • OpenAI API
      • Google ADK
      • Gold-answer checks
        PROTOTYPING & DELIVERY
      • Python services
      • API integrations
      • Cloud Run
      • Firestore
      • Qdrant
      • Streamlit
      • Rapid prototyping
        SEARCH, DATA & PRODUCT
      • Search quality
      • SQL
      • Experiment design
      • Product analytics
      • Metrics frameworks
      • Cross-functional alignment
        LEADERSHIP
      • Team leadership
      • Hiring & mentoring
      • Coaching
      • Stakeholder alignment
      • OKRs

    Languages

    • Russian
      Native
    • English
      B2
    • Spanish
      A2

    Interests

    • Biology / bioengineering
    • Aviation
    • Sociology