olehbairak

Test Infrastructure Engineer / QA Tech Lead Test Infrastructure Engineer / QA Tech Lead Telemetry Solana trading system · Full-timeTelemetry Solana trading system · Full-time Sep 2025 - Present · 6 mosSep 2025 to Present · 6 mos Remote · RemoteRemote · Remote Architecting scalable test infrastructure and AI-driven quality automation for high-frequency Solana trading platform processing 50K+ transactions daily. - Built end-to-end test infrastructure from scratch covering Solana on-chain programs, Rust backend services, TypeScript APIs, and React frontend with 87% code coverage - Implemented AI-powered test optimization using Claude for intelligent test case generation and failure analysis, reducing maintenance overhead 35% and test execution time 42% - Designed comprehensive observability stack (Grafana, Sentry, BetterStack) with custom dashboards tracking 50+ quality metrics and real-time alerting, achieving <0.5% production incident rate - Integrated automated testing into CI/CD pipelines (GitHub Actions, Docker, Kubernetes) enabling daily deployments with zero-downtime releases for critical trading infrastructure - Established performance testing framework with K6 validating system capacity under 100K TPS load, identifying bottlenecks that improved API latency from 450ms to 85ms (P95) Tech Stack: Playwright, TypeScript, Rust, Solana Web3.js, K6, Grafana, Prometheus, Sentry, BetterStack, PostgreSQL, Redis, Docker, Kubernetes, GitHub Actions, OpenAI API

High-impact consulting engagement to rapidly establish QA infrastructure for cross-chain messaging protocol connecting 12 blockchain networks (Ethereum, Polygon, BSC, Arbitrum, Avalanche, Fantom, Optimism, zkSync, Base, Linea, Scroll, Mantle). - Designed comprehensive QA roadmap and test strategy for multi-chain DeFi protocol in 3 weeks, covering bridge security, cross-chain message validation, and smart contract testing - Built automated test suites using Playwright and Hardhat for Solidity smart contract validation across 12+ EVM-compatible chains - Created testing frameworks for cross-chain bridge operations including message passing, state synchronization, and failure recovery scenarios - Established security testing protocols including reentrancy attack simulation, front-running detection, and economic attack vector analysis - Delivered complete QA infrastructure enabling successful mainnet launch with zero critical vulnerabilities, processing $5M+ TVL in first week Project concluded after successful mainnet deployment as protocol pivoted business model (common in early-stage DeFi) Tech Stack: Playwright, Hardhat, Foundry, Ethers.js, TypeScript, Python, Solidity, Ethereum, Polygon, BSC, Arbitrum, GitHub Actions, The Graph, TenderlyHigh-impact consulting engagement to rapidly establish QA infrastructure for cross-chain messaging protocol connecting 12 blockchain networks (Ethereum, Polygon, BSC, Arbitrum, Avalanche, Fantom, Optimism, zkSync, Base, Linea, Scroll, Mantle). - Designed comprehensive QA roadmap and test strategy for multi-chain DeFi protocol in 3 weeks, covering bridge security, cross-chain message validation, and smart contract testing - Built automated test suites using Playwright and Hardhat for Solidity smart contract validation across 12+ EVM-compatible chains - Created testing frameworks for cross-chain bridge operations including message passing, state synchronization, and failure recovery scenarios - Established security testing protocols including reentrancy attack simulation, front-running detection, and economic attack vector analysis - Delivered complete QA infrastructure enabling successful mainnet launch with zero critical vulnerabilities, processing $5M+ TVL in first week Project concluded after successful mainnet deployment as protocol pivoted business model (common in early-stage DeFi) Tech Stack: Playwright, Hardhat, Foundry, Ethers.js, TypeScript, Python, Solidity, Ethereum, Polygon, BSC, Arbitrum, GitHub Actions, The Graph, Tenderly

Led comprehensive QA transformation for TON blockchain gaming ecosystem, building test infrastructure from zero across 8+ concurrent Web3 gaming projects supporting 150K+ daily active users. - Architected scalable test automation framework using Playwright + TypeScript covering smart contract integration, TON wallet connectivity (Tonkeeper, MetaMask), on-chain transaction validation, and game mechanics testing - Integrated K6 performance testing into CI/CD pipelines with real-time monitoring via BetterStack and Grafana dashboards, validating system performance under 10K concurrent players - Automated API testing and PostgreSQL database validation flows, implementing data integrity checks that caught 150+ critical bugs pre-production, reducing post-launch issues 40% - Built cross-functional QA culture across distributed teams spanning 4 time zones, establishing quality gates, code review standards, and release checklists - Mentored 3 junior QA engineers and created comprehensive Web3 testing documentation Key Achievement: Zero critical bugs during peak season with 150K+ DAU and $2M+ in-game transaction volume Tech Stack: Playwright, TypeScript, Jest, K6, Grafana, PostgreSQL, BetterStack, TON SDK, TON Connect, Solidity, GitHub Actions, Docker

Tasks: • Blockaing technologies testing (Bridges/Portal/Block Explorer, CLI, Nodes, Tutorials, Docs, Competitors testing, etc.) • Automation test creation and fixing (JS/TS, Playwright, JEST) • Analyzing market analogs and performing deep testing of cons and pros of each product with detailed reports • Creating and implementing new approaches with full documentation coverage (Notion, Allure, Use cases, Test cases) • Performing analyze of test tools for the team and making decisions based on the investigation results • Work on the documentation projects (Docuasurus/Tutorials/Docs) • Performing UAT for different type of projects (IOS, Android, Desktop, etc) • Covering full QA collaboration on separate projects (Owner) • Working with BD (PostgreSQL), GitHub CI (Github Workflows)

Tasks: • Testing of fast-developing CRM system for Europe car industry • Writing automation tests in Cucumber framework • Testing databases and API, network responses etc. • Knowledge of Linux bash scripts and operating Linux platform (Mint, Ubuntu, Debian) • Improved automation test coverage by 50% and test case coverage to full coverage of the products

Tasks: • Web2 testing of Leading Gambling platform and requirements for integration in different country regions laws • Creating and filling reports and excel documents with test scenarios and test cases. • Testing databases and API • Improving test approaches and documentation

Tasks: • Web2 CRM system testing for Hotel Management system • Constant collaboration with Booking.com, AIRBNB, etc. • Creating and presenting test reports (using Excel, Jira, TestRatil, TM4T tool, Powerpoint presentations) • Functional/Regression/Sanity/Smoke/Exploratory/Crossbrowser/Localization/UI/Feature testing • Permanent collaboration with dev/production/customer support teams around the world (India, Canada, USA, Romania, France etc.)

Tasks: • FTC compliance specialist (Sony and Microsoft Compliance collaboration) • Organise and manage community reports checks and Live QA department work • Perform Performance Review and OKRs, SMART goals • Knowledge sharing sessions and implementation of new initiatives • Coaching and supporting newcomers/performing interviews • Testing AAA titles, web-applications on PC (different hardware configurations), PlayStation 4, XboX (all versions and development kits), Nintendo Switch. • Advanced knowledge of JQL and Jira tools. (participation in arranging new Jira instance for projects) • Leading and preparing/updating test documentation (Test Plan, Resource Human/Hardware allocation plans, Checklists, Test Scenarios, Test Cases, Test Suits) • Testing of web-stores, desktop applications, AAA games