Вячеслав

KYIV, UKRAINE • [open contact info](look above in the "contact info" section) • TG @THEPOWBASIC

VYACHESLAV GRYSKOV
QA ENGINEER

PROFESSIONAL SUMMARY

I'm a QA engineer focused on testing crypto products, Web3 platforms, and smart contract logic. I don’t just click buttons — I
dive deep into how blockchain systems work, how contracts interact, and how data is fetched and rendered on the frontend.
I’ve tested swap logic on both DEXes and CEXes, verified business logic execution, and compared frontend results with real
blockchain data and backend databases. A strong focus of my work has been on identifying edge cases and security-related
scenarios — anything that could potentially lead to financial loss or user confusion.
I’ve also worked with token creation and lifecycle testing, from deployment to buy/sell functionality, as well as systems like
referral rewards, point mechanics, and mission/task flows. I'm comfortable with WalletConnect integrations, multichain
environments (ETH, BSC, Conflux, Near), and understanding the connection between on-chain events and what the user
actually sees.
I thrive in fast-paced environments where attention to detail and deep system understanding make a real impact.

EXPERIENCE
QA ENGINEER Apr 2025 - Jun 2025
The One(Crypto) Ukraine, Kyiv
• Functional & Security Testing for Crypto Exchange Aggregator
– Performed deep testing of swap logic across both centralized and decentralized exchanges, ensuring correct price execution,
slippage handling, and routing
– Validated backend data against live exchange data and database entries to confirm accuracy of balances, order outcomes,
and trade summaries
– Conducted full-cycle UI/UX testing for web interface, covering responsiveness, usability, and edge-case navigation scenarios
– Focused on security-related testing: auth flow validations, token/session handling, and prevention of potential financial
risks from edge cases or abuse
– Verified business logic related to custom swap paths, commissions, affiliate systems, and routing algorithms
– Designed and executed negative tests for failed transactions, timeouts, mismatched balances, and other potential loss
scenarios
– Collaborated closely with developers and product owners to clarify trading logic and ensure real-world trading behavior
matched business requirements
- Load testing
QA ENGINEER Aug 2024 - Jun 2025
Gra.Fun(Crypto) Ukraine, Kyiv
• Functional Testing of Blockchain Token Logic
– Tested full lifecycle of token creation: deployment, logic execution, buying/selling, and edge cases
– Verified smart contract logic across multiple blockchains (BSC, Ethereum, Conflux, Near)
– Analyzed and validated business logic behind token deployment, execution rules, and interaction correctness
• Web & Mobile Testing & Backend
– Conducted UI/UX testing for both Web and Mobile platforms, ensuring responsiveness and usability
– Tested referral system mechanics, point accrual logic, and mission completion workflows
– Evaluated data consistency from on-chain to frontend, including proper handling of events and state updates
– Ensured secure WalletConnect integration and seamless dApp behavior in real-world user scenarios
QA ENGINEER Apr 2024 - Jun 2025
DeXe DAO Studio(Crypto) Ukraine, Kyiv
• Smart Contract Logic & Blockchain Integration Testing
– Analyzed and tested business logic of smart contracts (including custom tokens, bridges, staking, DAO mechanics, etc.)
– Worked with on-chain data fetched directly to the frontend (on-chain calls, subgraphs, etc.)
– Validated dApp behavior with WalletConnect in various scenarios (connection, signing, network switching, user rejection)
– Identified edge cases and potential vulnerabilities in smart contract and frontend integration
– Tested DeFi flows including wallet connections, portfolio management, investment actions, proposal creation, DAO
interactions
 • Web & Mobile Testing
– Functional, UI/UX, and cross-browser testing of responsive and standalone web/mobile apps
– Responsive layout and usability checks across multiple resolutions and devices
QA ENGINEER Jul 2022 - Mar 2023
Merehead(Crypto) Ukraine, Kyiv
• Testing the API for logic/functionality/security/practice
• Testing mobile app for usability/functionality/stability
• Functional, non-functional testing, regression testing
• Developing testing documentation
• Functionality operability
• Testing crypto-exchange, blockchain, NFT market
QA ENGINEER Jan 2021 - Mar 2022
NDA(Gambling) Ukraine, Kyiv
• Websites testing/mobile app testing
• Implementation automation process for QA team and most of the department
• Quality Assurance through communication with departments to prevent bugs
• Quality Control of Product
• Test automation
• Writing Google Sheets Macros
• Gathering and analysis discovered bugs
• Testing mobile app for usability/functionality/stability

SKILLS AND TOOLS
Knowledge of a testing theory (Types of Testing, Test Artefacts, Test Design, Software Test Life Cycle),
Implementation experience of automation with Python and Selenium, Developing Test Plans, Test Cases, Bug Reports,
Familiar with tracking systems (Notion ,Trello, YouTrack, Atlassian), Analytical skills, attention to details,
Strong communication and interpersonal skills, responsible, reliable and creative,
Testing projects with microservice architecture, Testing API for security vulnerabilities,
Tools: Charles, Chrome Dev Tools, Selenium IDE, Postman, PyCharm, Proxyman, ChatGPT.

EDUCATION
2016 - 2020
International Scientific and Technical University(Yuri Bugai) Ukraine, Kyiv
OIL&GAS ENGINEERING AND TECHNOLOGY

AWARDS
BUG BOUNTY
Vulnerability with the balance account. White.market 2022
Vulnerability with the market items. White.market 2022
Vulnerability with the balance account, shop items, users accounts. Entertainm.io 2022
Vulnerability with the project logic(any manipulation. Gamercraft.com 2022
Vulnerability with the internal points. Blum 2024
On-chain data overwrite via logic manipulation. NDA 2025
IDOR vulnerability. NDA 2025

LINKS
HackenProof: hackenproof.com, LinkedIn: www.linkedin.com.