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Denys Oleksiienko

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Connections 3

od***mi@gmail.com

About

I am a QA Engineer with 12+ years of experience in manual & automation testing within the gambling industry 🎲 (casino platforms 🎰, live games 🎥, sports betting 🏆, and AdTech 💵). My goal is not just to find bugs 🐞, but to detect critical vulnerabilities that impact gameplay 🎮, payments 💳, and user experience 🎯. I have successfully tested dozens of high-load gaming platforms ⚡, ensuring their stability, security 🔒, payment systems 💰, bonus mechanics 🎁, and RTP accuracy. Over the past five years, I have conducted 5000+ UX audits 📊, helping businesses improve product usability 🚀 and customer retention. 🔥 Key Achievements: ✅ Automated 40% of regression testing ⚙️, reducing testing time by 50% using Cypress (UI + API) & Python (Pytest) 🤖. ✅ Detected & reported critical payment 💳 security vulnerabilities, preventing significant financial losses 💰. ✅ Enhanced RTP validation & fraud detection mechanisms 🛡️, ensuring fair play across multiple online casinos. ✅ Optimized UX/UI 🔍 audits, increasing conversion rates 🚀 and reducing churn for digital platforms. 🎮 Core Skills: 🎰 Gambling & Casino QA – Functional, regression, API testing, cross-browser & cross-device testing. 🤖 Test Automation – Cypress, Pytest, JavaScript, Python, CI/CD (Jenkins, GitHub Actions). 💳 Payments & Security Testing – Fraud detection, bonus abuse prevention, RTP validation. 📊 UX/UI Analysis – Heuristic evaluations, usability audits, A/B testing strategies. ⚡ High-Load Testing – Experience with Ad Networks, real-time bidding, and microservices testing. 🛠️ Tools & Technologies: 🔍 Testing & Debugging: Charles Proxy | Postman | Cypress | Pytest | Selenium ... 📊 Analytics & Monitoring: Google Analytics | Screaming Frog | Grafana ... 💾 Databases & Queues: MySQL | MongoDB | RabbitMQ | Redis ... 🛠️ DevOps & Cloud: Docker | Kubernetes | AWS | GCP ... 💡 I believe that QA is more than testing – it’s about ensuring seamless user experience, business security 🔒, and platform scalability 🚀. I am always open to new challenges 🎯 and eager to bring my expertise to the next ambitious gaming project. 📌 Telegram: @Odesoftami 📌 GitHub: odesoftami 📌 Web: odi.su

Skills

QA
QA Automation
MySQL
UI/UX
Software Testing
API testing. Postman
Mongodb
cypress
JavaScript/GIT/HTML/CSS/Webpack/Esbuild/Rect
UX Research
10
Audit
10
English
7
Russian
10
Ukrainian
10
Slovak
3
Spanish
3

Experience

Denys Oleksiienko

Work experience

📌 Software QA Automation Tester🤖 | Gambling Platform Testing (🎥 Live Casino, Slots 🎰, Roulette) at Enjoy Gaming

October, 2023 - December, 2024
Fulltime

🔹 API & UI Test Automation for Gaming Services 🤖
✅ Developed API test automation for gaming services (🎡 Roulette, 🎰 Slots, 🎥 Live Games).
✅ Automated bet validation, win calculations, free spins & bonus games testing via API.
✅ Ensured data integrity for user actions: balance updates, game history, transactions.
✅ Verified gaming data handling and API stability under high traffic conditions.
🔹 UI Test Automation for Partner Platforms 🌍
✅ Monitored game availability & integration stability on third-party casino platforms.
✅ Automated UI tests to check game positioning, search results, and login functionality.
✅ Quickly resolved integration issues, preventing revenue losses due to disabled games.
🔹 Health Checks & Real-Time Monitoring 🛠️
✅ Configured & maintained pinger systems for real-time monitoring of game pages & servers.
✅ Automated service monitoring (API & server health checks) for early issue detection.
✅ Integrated with Kuma monitoring tools to ensure 24/7 uptime of casino games.
🔹 Load & Stress Testing of Slot Games 🚀
✅ Developed a Node.js bot 🦾 for load testing slot games under extreme traffic.
✅ Simulated high concurrent users to detect performance bottlenecks & ensure stability.
✅ Collaborated with DevOps & Docker environments to optimize testing environments.
💡 Impact & Achievements:
🔥 Reduced critical bugs in production, ensuring smoother player experience.
⚡ Accelerated testing cycles with automated API/UI checks.
🎰 Improved game stability on partner platforms, strengthening B2B relationships.
📊 Optimized monitoring processes, preventing downtime & revenue loss.

Denys Oleksiienko

Work experience

📌 QA Automation & Manual Engineer | API & Web Testing (gambling) at Innovation Group Ukraine

June, 2022 - August, 2023
Fulltime

🔹 Automation Testing for API & Web Applications 🤖
✅ Developed & maintained automated tests in Python (Selenium, Gherkin, Cucumber).
✅ Optimized test automation code using OOP, SOLID principles & Design Patterns.
✅ Created & managed test documentation 📑 (checklists, test cases).
🔹 Functional & Regression Testing ⚙️
✅ Performed functional, integration & negative testing for web-based gambling apps.
✅ Validated data integrity in MySQL and analyzed logs using ELK Stack 📊.
✅ Monitored network traffic with Charles Proxy & Fiddler to debug API issues.
🔹 CI/CD & Bug Tracking 🚀
✅ Configured & executed automated tests in Jenkins, integrating with CI/CD pipelines.
✅ Managed test documentation & workflows in Jira & Confluence.
✅ Tracked & analyzed critical bugs, improving application quality & stability.
💡 Impact & Achievements:
⚡ Reduced the number of critical production bugs, ensuring higher platform reliability.
🎯 Accelerated testing cycles by optimizing test automation workflows.
📊 Improved overall code quality, reducing maintenance efforts for test automation.

Denys Oleksiienko

Work experience

📌 QA Manual Tester & UX Researcher | eCommerce 📈 & Web Testing at Kwork

January, 2020 - December, 2022
Freelance

For the past three years, I have been working as a freelance QA specialist on Kwork, performing daily website testing & UX audits. I have conducted 5,000+ UX audits, helping businesses improve usability, optimize user flows & increase conversions.
🔹 Consumer Behavior & User Interaction 📊
✅ Analyzed target audience behavior & loyalty to optimize engagement strategies.
✅ Mapped entry points & user flow, identifying bottlenecks & friction points.
✅ Created & evaluated click maps to assess user navigation efficiency.
🔹 UX/UI Testing & Problem Detection 🔍
✅ Conducted structural & graphical website analysis to ensure intuitive design.
✅ Identified faulty functionality, hard-to-read elements & confusing UI patterns.
✅ Evaluated the visual hierarchy of text & content placement for better readability.
🔹 Competitive Analysis & Benchmarking 🚀
✅ Performed competitor UX/UI research, assessing market trends & design patterns.
✅ Identified Unique Selling Propositions (USPs) to enhance online positioning.
✅ Provided insights on marketing & conversion optimization strategies.
🔹 Enhancing the User Journey & Conversions 💰
✅ Optimized ordering & checkout flows, reducing friction & increasing conversion rates.
✅ Suggested UX/UI improvements to boost user retention & engagement.
💡 Impact & Achievements:
⚡ Fixed usability issues & improved navigation, making websites more intuitive.
📈 Enhanced conversion rates by optimizing user journeys & removing friction points.
🎯 Helped clients gain a competitive edge through better UX strategies.

Denys Oleksiienko

Work experience

Major Account Manager | AdTech & Traffic Optimization at Adbless

January, 2018 - January, 2019
Fulltime

🔹 Ad Campaign Management
✅ Managed ad campaigns by placing banners, setting up traffic, and ensuring seamless ad module integration across multiple platforms.
✅ Optimized ad placements to maximize visibility, engagement, and revenue generation for clients.
🔹 Traffic Optimization & Performance Enhancement
✅ Worked closely with clients and traffic analysts to analyze campaign performance, identify areas for improvement, and optimize for better conversion rates.
✅ Maximized ROI by improving targeting, adjusting traffic sources, and fine-tuning strategies.
🔹 Quality Control & Ad Testing
✅ Verified the accuracy of ad displays across platforms, ensuring proper functionality of integrations.
✅ Collaborated with developers to resolve issues promptly, ensuring campaigns ran smoothly without disruptions.
🔹 Client Interaction & Relationship Management
✅ Delivered technical support and consultation to clients, ensuring a smooth ad campaign process and maintaining high levels of customer satisfaction.
✅ Managed end-to-end campaign life cycles, from setup to execution, ensuring deadlines and performance goals were met.
🔹 Partner Acquisition & Negotiation
✅ Successfully established new business partnerships and negotiated contracts for ad placements.
✅ Expanded client base by securing new deals and optimizing existing relationships for sustained business growth.
💡 Impact & Achievements:
⚡ Reduced technical issues in advertising platforms, building trust and reliability with clients.
📈 Streamlined integration processes, accelerating campaign launch times and improving overall efficiency.
🎯 Maintained long-term partnerships with clients, contributing to business growth and retention.

Denys Oleksiienko

Work experience

📌 Software QA Tester | Manual Testing (Web Applications, Chrome Extensions, Ad Network) 2016 - 2020 · 4 г.2016 – 2020 · 4 г. 🔹 Manual Test at Adbless

January, 2016 - January, 2020
Fulltime

🔹 Manual Testing of Web Applications & Chrome Extensions
✅ Conducted manual testing of web apps and Chrome extensions, including ad network integration, ensuring smooth functionality across platforms.
✅ Tested ad placement plugins for performance and compatibility on various browsers and devices.
✅ Validated banner ad integration with third-party platforms, enhancing user interaction.
🔹 Defect Tracking & Reporting
✅ Identified, tracked, and documented defects, collaborating with developers for quick resolution and retesting.
✅ Created detailed bug reports, test plans, and checklists to maintain high-quality control throughout development.
✅ Coordinated testing processes to ensure software met quality standards before release.
🔹 Test Planning & Documentation
✅ Developed and executed comprehensive test plans to ensure feature accuracy and app performance.
✅ Supported approval of software releases, confirming compliance with technical requirements and specifications.
🔹 A/B Testing & Usability Testing
✅ Conducted A/B testing for banner ads to optimize campaign performance and conversion rates.
✅ Performed usability testing of Chrome extensions and ad placements to ensure seamless user experiences.
🔹 Operating Systems & Windows Application Testing
✅ Deployed various OS (including Windows) to simulate different environments, ensuring extension compatibility.
✅ Tested compatibility of Windows apps with Chrome extension installations and browser updates.
✅ Validated plugin functionality during installations and updates to ensure smooth ad integration.
💡 Impact & Achievements:
⚡ Ensured successful ad network integration across platforms with minimal defects, improving campaign management.
📈 Enhanced A/B testing effectiveness, leading to better conversion rates for clients.
🎯 Ensured reliable Chrome extensions, improving user experience and client satisfaction.

Denys Oleksiienko

Work experience

📌 Manual QA | Mobile QA (Game Testing & Android App QA) at Nda

January, 2014 - January, 2016
Parttime

🔹 Quality Control for Android Games & Apps
✅ Conducted comprehensive testing of Android games and apps, ensuring smooth functionality and usability across devices.
✅ Validated game mechanics, ensuring smooth execution of features like free spins, bonuses, and in-app purchases.
🔹 Usability Testing & UX Optimization
✅ Verified button functionality and element display, ensuring an intuitive user experience.
✅ Conducted usability testing to ensure smooth game flow and UI compatibility across various screen sizes.
🔹 Monetization Integration & Ad Testing
✅ Integrated ad codes in games, ensuring proper placement and smooth transitions without disrupting gameplay.
✅ Tested monetization features, optimizing for revenue generation while maintaining user experience.
🔹 End-to-End Game Testing
✅ Tested games from development to launch, identifying and fixing defects in gameplay, UI, and performance.
✅ Monitored in-app transactions for accuracy, preventing errors in payments and rewards.
🔹 Google Play Store Integration & App Launch
✅ Coordinated game submissions to the Google Play Store, ensuring all guidelines were met and processes were seamless.
✅ Supported successful game launches, troubleshooting and optimizing post-launch performance.
🔹 Test Documentation & Defect Tracking
✅ Created test cases, scenarios, and reports for internal teams and end users.
✅ Actively tracked defects, collaborating with developers to resolve issues and improve app quality.
💡 Impact & Achievements:
⚡ Delivered a flawless user experience by fixing UI/UX issues and optimizing apps across Android devices.
📈 Contributed to the successful launch of Android games with monetization features, boosting client revenue.
🎯 Enhanced game stability and quality, minimizing critical post-launch errors and improving user satisfaction.

Denys Oleksiienko

Education

Architecture at Odessa State Academy of Civil Engineering and Architecture

August, 2001 - June, 2008
Fulltime

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