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Anton Usik
Verified Expert in Engineering
QA Automation Engineer and Developer
Georgetown, TX, United States
Toptal member since February 9, 2026
Bio
Anton is a senior QA automation engineer and SDET with over 10 years of experience building scalable test automation solutions for complex web, mobile, and back-end systems. Proficient in Java-based automation, API testing, back-end validation, and CI/CD integration, he focuses on test framework architecture, risk-based testing, and quality strategy. Collaborating with engineering teams, Anton improves test coverage and helps ensure reliable, high-quality software delivery in Agile environments.
Portfolio
DataArt
Java, Selenide, TestNG, REST Assured, GraphQL, Postman, Azure DevOps...
Coherent Solutions
Java, Appium, Selenium, TestNG, Salesforce, Jenkins, Sauce Labs, Applitools...
TeachMeSkills
Mentorship & Coaching, Java, TestNG, Selenium, REST Assured, Jenkins...
Experience
- Java - 11 years
- TestNG - 11 years
- Selenium - 11 years
- Git - 11 years
- REST APIs - 10 years
- REST Assured - 10 years
- Jenkins - 9 years
- Selenide - 3 years
Preferred Environment
Windows, MacOS, Java, REST APIs
The most amazing...
...achievement has been performing back-end validation across distributed systems, integrating Oracle NetSuite, Salesforce, BigCommerce, and internal APIs.
Work Experience
Senior QA Automation Engineer
2022 - 2025
DataArt
- Designed and maintained scalable API and UI automation frameworks using Java, Selenide, TestNG, Allure, Grafana, using Page Object Model, Abstract Factory, parallel execution strategies and following clean code principles and reusable architecture.
- Created infrastructure and test coverage across critical business workflows by implementing regression packs, smoke suites, API validation, and end-to-end integration tests, using risk-based testing and strategy planning.
- Built robust API automation for REST and GraphQL using REST Assured with JSON schema validation, authentication, and authorization validation, contract testing, and data-driven request modeling.
- Integrated automated tests into Azure DevOps pipelines using pipeline as code, parallel job execution, automated reporting, flaky test detection, and enforced quality gates.
- Performed back-end validation by verifying service interactions across distributed systems involving Oracle NetSuite, Salesforce, BigCommerce, and internal APIs.
- Enabled reliable cross-browser and cloud-based test execution using TestMu AI on LambdaTest, increasing platform coverage and shortening feedback loops.
- Conducted code reviews, enforced coding standards, introduced static analysis tools, improved execution speed, and reduced flakiness.
- Leveraged generative AI (GenAI), including GitHub Copilot, Claude, and ChatGPT, to generate boilerplate code, analyze failures, create test data, and accelerate framework development.
Technologies: Java, Selenide, TestNG, REST Assured, GraphQL, Postman, Azure DevOps, GitHub Copilot Chat, TestMu AI, Git, JSON, Windows, QA Automation, API Testing, Monitoring, Quality Assurance (QA), Test Cases, CI/CD Pipelines, Playwright, Cursor AI, SQL, Claude, REST API Automation, API Framework, Test Automation Frameworks, Microservices, SDET, Regression Testing, Smoke Testing
Senior QA Automation Engineer
2021 - 2022
Coherent Solutions
- Developed mobile automation frameworks using Appium for iOS/Android with locator optimization, test executors, and reusable libraries, applying test design best practices.
- Integrated test suites into Jenkins CI/CD, enabling distributed execution, dynamic environment setup, and automated artifact management.
- Built UI automation for complex web systems using Selenium WebDriver, adding custom wait mechanisms, retry logic, and resilience improvements.
- Implemented API validation across back-end services using REST Assured and Postman collections.
- Oversaw a small team of QA automation engineers, performed mentoring, code reviews, and test strategy refinement.
- Connected frameworks to Sauce Labs for mobile device cloud execution, improving coverage and reducing execution time.
Technologies: Java, Appium, Selenium, TestNG, Salesforce, Jenkins, Sauce Labs, Applitools, QA Automation, API Testing, Quality Assurance (QA), Mobile, Test Cases, CI/CD Pipelines, Zephyr, SQL, Mobile App Testing, REST API Automation, API Framework, Test Automation Frameworks, JUnit, Microservices, Regression Testing, Smoke Testing
Tech Trainer and QA Automation Instructor
2021 - 2021
TeachMeSkills
- Trained more than 50 students in Java, Selenium, API automated testing, and mobile automation.
- Designed a full automation curriculum covering framework structure, test architecture, CI/CD integration, and code quality guidelines.
- Mentored junior engineers and supported job placement preparation.
Technologies: Mentorship & Coaching, Java, TestNG, Selenium, REST Assured, Jenkins, Presentations, Git, QA Automation, API Testing, Quality Assurance (QA), CI/CD Pipelines, REST API Automation, API Framework, Test Automation Frameworks, JUnit
Software Development Engineer in Test (SDET)
2020 - 2021
21vek.by
- Built an automation framework for API, UI, and back-end systems using Java and TestNG with modular architecture, custom libraries, and environment-agnostic design.
- Implemented API contract tests with REST Assured and WireMock, including stubbing, request simulation, error scenarios, and schema validation.
- Performed back-end validation by inspecting RabbitMQ queues and verifying message payloads, as well as validating event flows in Kafka.
- Conducted deep database testing using Java Database Connectivity (JDBC), PostgreSQL, MySQL, Elasticsearch, and MongoDB, verifying data integrity, indexing, and propagation across services.
- Automated local testing environments using Docker, significantly reducing onboarding time and test flakiness.
Technologies: Java, TestNG, WireMock, RabbitMQ, JDBC, Apache Kafka, PostgreSQL, Elasticsearch, Docker, MongoDB, Swagger, QA Automation, API Testing, Quality Assurance (QA), Test Cases, CI/CD Pipelines, SQL, REST API Automation, API Framework, Test Automation Frameworks, Microservices, SDET, Regression Testing, Smoke Testing
Senior QA Engineer
2017 - 2019
instinctools
- Automated API testing flows via Postman, including collection automation, schema checks, and request chaining.
- Implemented performance and load testing using JMeter, performing throughput analysis and bottleneck detection.
- Leveraged Charles Proxy and Fiddler for traffic inspection, debugging, SSL proxying, caching analysis, and back-end data validation.
Technologies: Java, Selenium, Appium, iOS, Android, REST Assured, Postman, Apache JMeter, Charles Proxy, Swagger, QA Automation, API Testing, Quality Assurance (QA), Mobile, Test Cases, CI/CD Pipelines, SQL, Mobile App Testing, REST API Automation, API Framework, Test Automation Frameworks, Microservices, Regression Testing, Smoke Testing
QA Engineer
2014 - 2017
EPAM Systems
- Developed UI and mobile automation frameworks for enterprise web apps and high-traffic mobile platforms.
- Built a complete mobile automation framework from scratch for iOS and Android, integrated with Jenkins and Git.
- Performed API, UI, cross-browser, and integration testing for distributed systems.
Technologies: Java, Selenium, TestNG, Jenkins, Git, Jira, Magento, Adobe Experience Manager (AEM), iOS, Android, QA Automation, API Testing, Quality Assurance (QA), Mobile, Test Cases, CI/CD Pipelines, Zephyr, SQL, Mobile App Testing, REST API Automation, API Framework, Test Automation Frameworks, JUnit, Microservices, Regression Testing, Smoke Testing
Junior QA Engineer
2013 - 2014
Playtika
- Executed functional, performance, and compatibility testing for large-scale mobile gaming platforms across iOS, Android, and Windows Phone.
- Conducted back-end validation, in-app purchase testing, and multi-device scenario checks.
- Improved the quality of the Caesars Slots mobile casino application.
Technologies: .NET, Xamarin, iOS, Android, Windows Phone, MySQL, Android Debug Bridge (adb), Xcode, PuTTY, Quality Assurance (QA), Mobile, Test Cases, SQL, Mobile App Testing, Regression Testing, Smoke Testing
Experience
21vek.by Hypermarket Application
https://www.21vek.by/I contributed to the development of a web-based hypermarket application, testing data transfer between multiple microservices. I built a dedicated testing framework and ran automated tests in CI across dynamic environments.
Education
2009 - 2013
Bachelor's Degree in Statistics
Belarusian State Economic University - Minsk, Belarus
Skills
Libraries/APIs
REST APIs, JDBC, Playwright
Tools
REST Assured, Jenkins, Git, Jira, Postman, Android Debug Bridge (adb), Xcode, PuTTY, Adobe Experience Manager (AEM), Apache JMeter, Charles Proxy, WireMock, RabbitMQ, Zephyr, Claude
Frameworks
Selenium, TestNG, Selenide, API Framework, Appium, JUnit, .NET, Swagger
Languages
Java, SQL, GraphQL
Paradigms
Microservices, Azure DevOps
Platforms
Windows, iOS, Android, Salesforce, Mobile, MacOS, Xamarin, Windows Phone, Magento, Apache Kafka, Docker
Storage
MySQL, JSON, PostgreSQL, Elasticsearch, MongoDB
Other
QA Automation, Quality Assurance (QA), Test Cases, Mobile App Testing, REST API Automation, Test Automation Frameworks, Regression Testing, Smoke Testing, API Testing, CI/CD Pipelines, SDET, Statistics, Economics, Mentorship & Coaching, Presentations, Sauce Labs, Applitools, GitHub Copilot Chat, TestMu AI, Monitoring, Cursor AI
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