Danylo Koval

Anti-Sybil / Fraud Detection Analyst

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Katowice, Poland

Experience

Jan 2025 - Dec 2025
1 year

Anti-Sybil / Fraud Detection Analyst

Confidential Company (under NDA)

  • Conducted on-chain transaction analysis and behavioral pattern detection to identify Sybil attacks and fraudulent activities.
  • Applied wallet clustering techniques and correlation analysis to link addresses across networks.
  • Built dashboards and visualized activity using Dune Analytics and Etherscan.
  • Gained hands-on experience with tools such as Arkham Intelligence, DeFiLlama, Zapper, Zerion, Chainabuse, Graphsense, and enterprise-grade forensic platforms including Chainalysis, Elliptic, Bitquery.
  • Performed OSINT research and constructed transaction graph visualizations to uncover suspicious flows.
  • Developed and tested smart contracts in Solidity, leveraging Truffle and Ganache for simulation and forensic experimentation.
  • Acquired practical knowledge of fraud detection strategies and anti-Sybil methodologies tailored to Web3 protocols and DeFi ecosystems.
Jan 2025 - Dec 2025
1 year

AI Data Annotator

StellarAI

  • Labeled and structured large-scale datasets for training multimodal AI systems, including UI-recognition models, image classifiers, and LLMs.
  • Designed diverse scenario-based test cases to improve model robustness across various user interactions, edge cases, and complex UI flows.
  • Created high-quality prompts and evaluated LLM outputs for accuracy, reasoning quality, semantic coherence, and safety compliance.
  • Conducted detailed annotation workflows, including entity extraction, intent classification, similarity scoring, and multi-step task evaluations.
  • Processed and analyzed high volumes of data while maintaining top-tier accuracy and consistency in labeling.
  • Authored technical documentation, annotation guidelines, and quality reports to standardize internal processes and support model retraining cycles.
  • Performed agent-behavior testing, validating tool execution paths, chain-of-thought consistency, and step-by-step task reasoning in LLM agents.
  • Participated in evaluation of model updates, running A/B testing and regression tests to ensure performance improvements.
  • Optimized data workflows by identifying inefficiencies and proposing solutions to accelerate annotation speed and improve dataset quality.
Sep 2024 - Jun 2025
10 months
Poland

Financial Analyst & Co-Founder

Forta Eternis LLC

  • Drove company turnover to 1.5M€+ within 9 months by optimizing budget allocation and implementing cost-efficient growth strategies in a highly competitive environment with a limited budget.
  • Designed and implemented analytical algorithms to process and interpret high-volume transactional data, providing insights that guided strategic decision-making and improved P2P cryptocurrency trading performance.
  • Acquired and onboarded 3,000+ unique clients through targeted P2P trading solutions and client-centric processes.
  • Established client communication protocols that improved retention rates, building a loyal base of 100+ regular clients.
  • Created fraud detection algorithms that identified and prevented 15+ attempted banking fraud cases, safeguarding company assets.
  • Managed all financial operations, including bookkeeping, transaction analysis (AML & CFT), and reporting (Regulatory reports), ensuring 100% accuracy.
  • Pioneered hedging strategies using futures market for high-risk crypto assets, reducing volatility-related losses by 99%.
  • Single-handedly developed a proprietary CRM system to streamline client management, reducing operational overhead.
Jun 2023 - Feb 2024
9 months
United Kingdom

Financial Analyst — Crypto Project Evaluation

Confidential Company (under NDA)

  • Conducted comprehensive due diligence on emerging cryptocurrency projects entering the market, including DeFi protocols and blockchain bridges seeking liquidity provision.
  • Assessed investment rounds, fundraising structures, and capital allocation efficiency.
  • Evaluated project founders’ backgrounds, reputation, and track record to determine credibility and long-term viability.
  • Analyzed business strategies, tokenomics models, and market positioning.
  • Prepared detailed investment risk/reward reports for executive decision-making on liquidity allocation.
  • Collaborated with trading and liquidity management teams to align investment decisions with market-making strategies.
May 2022 - Jun 2023
1 year 2 months
United Kingdom

P2P Crypto Broker — UK Market (GBP)

Confidential Company (under NDA)

  • Executed and managed P2P cryptocurrency trades on the UK market, operating primarily with GBP.
  • Conducted daily position planning for cryptocurrency buy/sell operations based on market conditions.
  • Performed market evaluation and short-term forecasting to determine optimal currency-to-crypto allocation for the following trading day.
  • Maintained accurate financial records of all transactions, ensuring compliance with internal and external reporting standards.
  • Prepared detailed financial and operational reports for the accounting department.
  • Developed and implemented strategies for routing funds through multiple payment systems to maximize transaction margins.
  • Oversaw large-volume bank transfers and ensured secure, compliant processing of high-value transactions.
  • Managed a trading turnover exceeding £150,000 per week.
  • Optimized payment processing routes, increasing overall trade profitability.

Summary

Professional analytical and detail-oriented Data Analyst with experience across finance, AI data annotation, and high-volume data processing.

Skilled in designing scalable data pipelines, developing algorithms for automated analysis, and transforming complex, multi-source datasets into actionable insights. Strong technical foundation in Python, SQL, and Solidity, with hands-on exposure to blockchain ecosystems and digital asset flows. Adept at working with large datasets, ensuring data quality, and optimizing operational processes.

Skills

  • Data Analysis (Sql, Python (Pandas, Numpy, Matplotlib))
  • Ai: Scenario-based Testing, Test Design, Annotation
  • Blockchain: Smart-contract Basics (Solidity, Truffle, Ganache)
  • On-chain Analysis
  • Dune, Etherscan, Arkham, Graphsense, Chainalysis, Bitquery
  • Excel (Macros, Vba, Excel Finance)
  • Google Sheets (Google App Scripts)
  • Quality Scoring, Error Categorization, Multilingual Evaluation
  • Workflows, Llm/ai Evaluation, Prompt Validation, Agent Behavior Testing
  • Financial Accounting: Full-cycle Bookkeeping, Financial Reporting, And Transaction Analysis
  • Regulatory Operations: Aml/cft Compliance, Risk Assessment, And Audit Preparation For Financial Institutions
  • Cryptocurrency Markets: P2p Trading (Binance Pro Merchant), Hedging Strategies, And Fx Rate Analysis For Crypto/fiat Pairs
  • On-chain Transactions And Smart Contracts Anlysis

Languages

German
Advanced
English
Advanced
Polish
Advanced

Education

Czestochowa University of Technology

B.Eng. in Informatics (Computer Science & Applied Mathematics) · Informatics (Computer Science & Applied Mathematics) · Częstochowa, Poland

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