Sergo Medin

Profile

Applied AI / Research Engineer with 10+ years across analytics, experimentation, search quality, and analytics leadership at Avito and Yandex. I build agentic search, retrieval, and evaluation workflows, plus the Python services around them, turning ambiguous product questions into measurable prototypes and working systems. Recent hands-on work includes an OpenAI API-powered Telegram insight search service that unlocked $50K+ in monthly revenue and a multilingual support copilot where I designed retrieval and evaluation workflows with Google ADK, Qdrant, and Google Cloud Run. I am strongest in roles on the boundary between research and engineering, where product thinking, quality measurement, and fast iteration matter alongside delivery.

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 internal AI and automation services.
  • 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 HR web service on a VM 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
  • Automation
  • Telegram
  • SQL

Independent Applied AI Projects

Remote

Multilingual AI Support Copilot

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

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 (article, repository).
  • Python
  • spaCy
  • Anki
  • Web scraping
  • AI workflows

Yandex

Remote

Data Analyst → Team Lead

Sep 2016 — Oct 2023

  • At Yandex Market, defined search-quality and coverage metrics from scratch across query buckets and competitor context, built a Python system using multiprocessing to query the Google PageSpeed API, added anomaly monitoring, and increased Google traffic to reviews by 20%.
  • 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.
  • 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 agents
      • OpenAI API
      • Google ADK
      • Retrieval systems
      • RAG systems
      • Evaluation workflows
      • Quality metrics
        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