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  1. Freelancers

Dmytro Staroselskyi

Offer Dmytro work on your next project.

Ukraine Lvov, Ukraine
18 hours 53 minutes back
Available for hire available for hire
on the service 6 years
Freelancer Dmytro S. — Ukraine, Lvov. Core skill — AI & Machine Learning, Bot Development

Rating

Successful projects
No data
Average rating
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Rating
198
AI & Machine Learning
473 place out of 2887
Bot Development 1
726 place out of 1946

Language proficiency level

Українська Українська: fluent
English English: upper-intermediate

Skills and abilities

Programming

Services

Portfolio


  • Eval-Lab — Regression of prompts and models

    AI & Machine Learning
    Eval-Lab — Regression of prompts and models — example of freelancer's portfolio work in category AI & Machine Learning
    Web dashboard for regression testing of prompts and models. Running a test set through two models/prompts — comparison based on 4 sub-scores.

    Technically interesting aspects:
    — LLM-as-judge through 5 providers (OpenRouter, Anthropic via tool-use, Gemini, Groq, mock)
    … — 4 sub-scores for each case: correctness, relevance, completeness, prompt_quality
    — Cap on final score for poor prompt — prevents strong model from masking poor prompt
    — Per-provider throttle and retry with backoff + Retry-After
    — Mock mode for running without API keys (CI-friendly, $0)
    — Editing secrets in logs

    Stack: FastAPI, async SQLAlchemy, Alembic, httpx, Pydantic, vanilla JS, Docker.

  • AI Research Agent on LangGraph

    AI & Machine Learning
    AI Research Agent on LangGraph — example of freelancer's portfolio work in category AI & Machine Learning
    An agent on LangGraph that autonomously plans searches, simultaneously browsing the web and arXiv, synthesizes responses with sources.

    Technically interesting aspects:
    — Parallel fan-out/fan-in graph with a reducer on tool_errors (the graph does not crash on provider failure)
    … — 4-provider search fallback: Tavily → SearchAPI → DuckDuckGo → Wikipedia
    — Source-grounded synthesis: refuses to respond without sources (anti-hallucination)
    — PostgreSQL persistence with SQLAlchemy + Alembic (4 migrations)
    — Robust JSON parsing with code-fence stripping and regex fallback

    Stack: LangGraph, FastAPI, PostgreSQL, SQLAlchemy, Alembic, OpenRouter, Tavily, BeautifulSoup, Docker.

  • AI Radar — RAG Research Assistant

    Bot Development
    AI Radar — RAG Research Assistant — example of freelancer's portfolio work in category Bot Development
    RAG-bot that collects AI news from 7 sources and answers questions with links to the sources.

    What is interesting technically:
    — Hybrid search: BM25 + vector search Qdrant, merged through Reciprocal Rank Fusion, plus cross-encoder reranker
    … — RAGAS evaluation of answer quality (faithfulness, answer_relevancy)
    — Auto-indexing via APScheduler every 6 hours
    — Telegram bot as a thin httpx client to FastAPI

    Stack: Python, FastAPI, LangChain, Qdrant, rank_bm25, sentence-transformers, aiogram, APScheduler, Docker, GitHub Actions.