Anton S.

EUROPEAN-CERTIFIED PROFESSIONAL | SDET | Web & Mobile Testing | PWA Looking for a reliable specialist who'll walk through your needs in detail and help grow your business? Whatever your business — a shop, a clinic, construction, real estate, a financial service, or something else — if you can explain in plain terms what your business does, I can help make sure your app or website does it well. Building your app – Works smoothly on any modern phone or tablet, not just the one it happened to be tested on – Built to last — clean, organized code that won't fall apart or become a nightmare to work with when you want to add something new six months from now – No "quick fixes" that come back to cost you more in rework a few months down the line Testing your app or website before your customers see it – Bugs and broken features get caught before your customers find them — not after they've already complained or walked away – I verify that everything actually does what it's supposed to, on the devices real people actually use – An independent set of eyes whose only job is to try to break the product before a paying customer does What kind of tasks I typically get – Building a mobile app for a shop, café, beauty salon, delivery service, or other business – Testing a website or mobile app before launch — from a medical clinic's website to an online store – Extending an existing app: adding a new feature to spec, updating it to meet current app store requirements (Google Play, App Store) – Finding and fixing bugs in a live product — before your customers find them What this looks like in practice – Online store: a customer doesn't abandon their cart because the checkout button froze – Clinic or medical service: the booking form doesn't lose a patient's details on submit – Construction or real estate: the cost calculator or inquiry form calculates correctly and works for every client, not just on your own computer – Financial service: the app handles customers' money without calculation errors or gaps in data validation You don't need to understand what's happening under the hood. You just need it to work — reliably, for real people, in the real world. That's what I take care of. Need more than testing? For backend, data and integration work I recommend my trusted partner Oleksandr, a senior developer with 6+ years in enterprise systems. Backend and APIs: C#, .NET Core and .NET Framework, ASP.NET, Entity Framework, REST API design and third-party API integrations. Data: SQL, MS SQL Server, Oracle, MongoDB, ETL and data pipelines, data cleaning and validation, web scraping, and reports delivered in the format you need. Automation: replacing manual work with reliable scripts and services (C#, Python), pipeline monitoring and notifications. His automation cut manual QA effort by over 40% and defect investigation time by up to 90%. Quality and delivery: unit testing (NUnit, Moq), Docker, GitLab CI/CD. He is also used to taking over complex legacy systems with little documentation and delivering a project end to end, from requirements to production. He builds, I test, so you get the full cycle from two specialists who already work together: a clean backend, a polished front end and an independent check that everything works on real devices before your customers see it. About me Hello! My name is Anton, and I specialize in mobile development along with mobile and web application testing. I bring 4 years of hands-on experience delivering real projects, with certified skills across these areas. I'd be happy to discuss your needs in detail and propose a solid solution tailored to your specific business or problem. Core Skills Android Development: Kotlin, Java, Jetpack Compose, XML Views, MVVM, MVP, MVI, Clean Architecture, Coroutines, Flow, Room, Retrofit, Hilt, Dagger2, Koin, Firebase, Jetpack Navigation Test Automation: Playwright, Selenium, Appium, TypeScript, JavaScript, Page Object Model, Custom Fixtures, Cross-Browser Testing, Visual Regression Testing, BDD/TDD, Cucumber, Gherkin API & Data Testing: REST API Testing, Postman, Insomnia, SoapUI, SQL, JWT/Auth Testing, JMeter, K6 (Performance Testing) QA Process & Methodology: SDLC, STLC, Test Planning, Test Case Design, Requirements Analysis, Risk-Based Testing, Manual & Automated Testing, Mentoring, QA Team Leadership Tools & CI/CD: Git, GitHub, GitLab, Jenkins, Azure DevOps, Docker, Jira, Confluence, TestRail, Allure