Владислав

Vladyslav Kharchenko
Senior QA Engineer — Web3 & Blockchain

Ukraine (Remote) | [open contact info](look above in the "contact info" section) | TG - @vld_khh | Phone [open contact info](look above in the "contact info" section)

Profile Summary:
Senior Quality Assurance Engineer with deep expertise in Web3 and
blockchain ecosystems, specializing in manual testing of DApps, multi-chain
wallets, and DeFi products. Skilled in testing smart contracts, token transactions,
and wallet integrations across EVM and non-EVM chains (Ethereum, CELO, Fuse,
Polygon, Solana, Bitcoin). Strong background in end-to-end QA, UAT, API
validation, and QA process setup for blockchain startups and crypto-native teams.
Known for delivering precise bug reports, structured test documentation, and
maintaining high release quality in agile environments.

Core Skills:
●​ Blockchain QA Expertise: Web3 DApps, wallet integrations, token transfers
(ERC-20, SOL, BTC), gas/fee validation, staking & claim testing.
●​ Cross-Chain Testing: Ethereum, Polygon, CELO, Fuse, Solana, Bitcoin.
●​ Test Planning & Execution: Manual testing, functional, regression,
exploratory, UAT.
●​ API & Network Validation: Postman collections, REST / GraphQL API testing,
RPC call tracing via Charles Proxy.
●​ Documentation: TestRail, Jira, Confluence, Google Sheets, QA reports &
release checklists.
●​ QA Process: Bug lifecycle management, test case design, release verification,
risk analysis.
●​ Platforms: Web, Android, iOS, multi-network wallets, smart-contract
explorers (Etherscan, Solscan, etc).
●​ Basic Automation Knowledge: Cypress, Playwright, GitHub Actions, CI/CD
awareness.
Experience:

NDA | 06/2025 - Present
Senior QA Engineer – Web3 Startup (Crypto-Fiat Platform & Wallet)

Crypto-Banking Startup | Web + Mobile | Native Token | Whitelisting & Quest
Platform

●​ Collaborated with the team to test a Web3 banking platform integrating
crypto, fiat, and on-chain reward systems.
●​ Verified multi-chain wallet functionality, token balances, staking, and reward
accrual through user quests and whitelist campaigns.
●​ Tested Web and mobile interfaces for token reward claiming, wallet
synchronization, and cross-network identity management.
●​ Validated crypto-to-fiat conversion flows and integrations with virtual
payment cards for real-world transactions.
●​ Ensured smooth onboarding and quest completion flows — user registration,
verification, and earning tokens.
●​ Designed test documentation and regression checklists for each feature
release cycle.
●​ Collaborated with developers and product owners to improve stability of RPCs,
API responses, and token logic.
●​ Participated in UAT sessions to align QA with business logic and tokenomics.

Technologies: Solana, Ethereum, Bitcoin, React, Node.js, Postman, TestRail

NDA | 01/2025 - 06/2025
Senior QA Engineer – Multi-Chain Crypto Wallet

Non-Custodial Web3 Wallet | Android & iOS | EVM, Solana & BTC Support | Virtual
Card Integration

●​ Performed full QA coverage for Web3 Wallet, a multi-chain Web3 wallet
supporting BTC, Solana, and EVM networks.
●​ Tested send, receive, and swap flows across major tokens and chain types.
●​ Validated virtual card integration, ensuring smooth conversion of crypto
assets (USDT, USDC) into fiat transactions via in-app card payments.
●​ Conducted testing of cross-chain synchronization, confirming accurate
balances, transaction states, and fee estimations.
●​ Performed functional, UI/UX, and regression testing across Android and iOS
devices.
●​ Collaborated with developers on debugging RPC requests, failed transactions,
and incorrect chain ID handling.
●​ Maintained regression suites, smoke tests, and feature-specific UAT scripts
before releases.
●​ Verified backup & recovery, seed phrase generation, encryption, and
transaction signing logic.

Technologies: React Native, Postman, Charles Proxy, Solana, Bitcoin, Polygon,
Ethereum

GoodDollar | 05/2020 - 12/2024
Senior QA Engineer – Web3 & DeFi Platform

Universal Basic Income (UBI) Protocol | G$ Token | Web + Android App | CELO &
Fuse Networks

●​ Served as the sole QA Engineer for the GoodDollar ecosystem — leading all
testing initiatives across web, Android, and blockchain layers.
●​ Conducted end-to-end testing for smart-contract operations, G$ token claims,
staking, and distribution logic on CELO and Fuse networks.
●​ Designed and executed QA processes for strategic integrations with major
global partners including eToro and Opera MiniPay, ensuring seamless wallet
connectivity, identity flow, and transaction interoperability.
●​ Validated Web3 wallet integrations, ensuring that external wallets could access
GoodDollar’s claim and staking features with full RPC and explorer
traceability.
●​ Performed deep API testing for eligibility, claims, staking, and bridge
endpoints; maintained reusable Postman collections for multiple
environments.
●​ Monitored and debugged on-chain events using Charles Proxy and blockchain
explorers (CeloScan, FuseScan, Etherscan).
●​ Conducted Android wallet QA—covering onboarding, backup and recovery,
transaction confirmations, push notifications, and cross-chain
synchronization.
●​ Authored and maintained all QA documentation, test plans, regression suites,
and UAT scripts; coordinated community testing cycles before public releases.
●​ Provided QA sign-off for protocol upgrades and third-party partnerships,
ensuring high reliability and compatibility for all integrations.
Technologies: CELO, Fuse, Ethereum, Node.js, React, Postman, Charles Proxy,
Android Studio

Tools & Technologies:
Postman | Charles Proxy | TestRail | Jira | Confluence | Figma | GitHub | Bitbucket
| Google Sheets​
Blockchain Explorers: Etherscan | Solscan | Blockstream​
Chains: Ethereum | Polygon | CELO | Fuse | Solana | Bitcoin​
Basic Automation Knowledge: Cypress | Playwright | CI/CD Pipelines (GitHub
Actions, Bitbucket).