sr.

Senior Quality Assurance Engineer

Sergei
Rudik.

A little less risk.
A lot more confidence.

I help teams ship reliable software through thoughtful testing, practical automation, and shared knowledge.

See how we can work together Explore my experience
Portrait of Sergei RudikEngineer. Mentor. Curious human.
Testing the details.
Seeing the bigger picture.
Quality engineeringTest automationAPI & backendMentorship
01 / ABOUT

Quality is
a team sport.

I’m a QA engineer who enjoys making complex systems more dependable — and helping people grow along the way.

Hi, I’m Sergei, a Senior Quality Assurance Engineer on the SIEM team at BI.ZONE. I automate frontend and backend testing, primarily with Python, and also work with JavaScript and Java.

From September 2020 to May 2026, I also mentored QA students at SkillFactory.

My specialties: testing and eating pizza.

I also share what I learn on Medium.

PythonpytestPlaywrightSeleniumAppiumJavaScriptJavaGitLab CI/CDDockerKubernetesSQL
02 / EXPERIENCE

Where I’ve
made an impact.

From APIs and mobile apps
to the teams behind them.

June 2024 - Present

BI.ZONE

Senior Quality Assurance Engineer · Full-time

SIEM team.

  • Developed and implemented an automated testing strategy, integrating testing into the development process.
  • Built a Python framework with pytest and achieved over 60% API test coverage.
  • Set up GitLab CI/CD pipelines and reduced regression testing time by 40%.
  • Maintained testing infrastructure using Docker and Kubernetes.
  • Implemented parallel test execution and virtualization, and used Git Flow and SQL in the testing workflow.
  • Participated in requirements analysis and conducted load testing on internal tools.

January 2023 - May 2024

Magnit.Tech

Senior QA Engineer

What I worked on
  • Tested logistics APIs and backend services manually and with Python and pytest; automated frontend testing with Playwright and mobile app testing with Appium.
  • Tested API integrations with iOS and Android apps and helped interview and onboard new hires.
  • Reduced test execution time by 40% through parallel testing and script optimization.
  • Improved test coverage by 30%, significantly reducing production errors.
  • Streamlined onboarding for new team members, reducing onboarding time by 20%.
  • Improved the stability of automated mobile tests, reducing failures by 15% through more robust assertions.

August 2021 - December 2022

Delivery Club

Lead QA Engineer

What I worked on

MLOps team.

  • Automated test scenarios with pytest and maintained the existing test suite.
  • Performed manual and automated functional, non-functional, and integration testing.

June 2020 - August 2021

Kaspersky Lab

Senior QA Engineer

What I worked on
  • Automated test scenarios with pytest and Selenium and maintained the existing test suite.
  • Wrote unit and snapshot tests with JavaScript and Jest.
  • Performed manual and automated functional, non-functional, and integration testing.
  • Prepared test plans and test scenarios.

September 2020 - May 2026

SkillFactory

QA Mentor (Part-time)

What I worked on
  • Helped students resolve questions and challenges.
  • Reviewed homework and provided feedback.
  • Worked through assignments with students one-on-one.
  • Contributed to improvements in training modules.

October 2019 - June 2020

Delimobil

QA Engineer

What I worked on
  • Tested web and mobile applications and validated administrative interfaces.
  • Developed automated API and backend tests in Python.

September 2018 - September 2019

ASOdesk

QA Engineer

What I worked on
  • Developed automated UI tests with Python and Selenium.
  • Manually tested new features and existing functionality.

September 2017 - September 2018

Netcracker Technology

QA Engineer

What I worked on
  • Tested a high-load system for telecommunications provider GTD, covering equipment and phone number management, subscriber service provisioning, and customer operations.
  • Performed manual testing and wrote automated tests with Robot Framework and internal tools.
03 / BEYOND WORK

Always
learning.

Education

Communications Engineer

Povolzhskiy State University of Telecommunications & Informatics

2010 - 2015

Off the clock

A curious mind
doesn’t clock out.

Travelling, driving, gaming — and a good slice of pizza.

My writing on Medium

04 / GET IN TOUCH

Good software starts
with a conversation.

rudikqa@gmail.com
LinkedIn ↗GitHub ↗Medium ↗X / Twitter ↗Instagram ↗Facebook ↗