Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Lukas Müller. I’m a Senior QA Engineer focused on web-based data applications for D2C and AdTech platforms. I blend robust manual testing with scalable automation to improve release quality and CRO. I enjoy building end-to-end test strategies, mentoring teammates, and collaborating with product and engineering to reduce defects and accelerate delivery. Based in Berlin, I work remotely with cross-functional teams, bringing a pragmatic, friendly approach to QA and continuous improvement. I love turning flaky tests into reliable checks and helping teams ship confident software faster.…Hi, I’m Lukas Müller. I’m a Senior QA Engineer focused on web-based data applications for D2C and AdTech platforms. I blend robust manual testing with scalable automation to improve release quality and CRO. I enjoy building end-to-end test strategies, mentoring teammates, and collaborating with product and engineering to reduce defects and accelerate delivery. Based in Berlin, I work remotely with cross-functional teams, bringing a pragmatic, friendly approach to QA and continuous improvement. I love turning flaky tests into reliable checks and helping teams ship confident software faster.

Lukas Müller

QA Engineer, Full Stack Developer, Web Developer, +2





Hi, I’m Lukas Müller. I’m a Senior QA Engineer focused on web-based data applications for D2C and AdTech platforms. I blend robust manual testing with scalable automation to improve release quality and CRO. I enjoy building end-to-end test strategies, mentoring teammates, and collaborating with product and engineering to reduce defects and accelerate delivery. Based in Berlin, I work remotely with cross-functional teams, bringing a pragmatic, friendly approach to QA and continuous improvement. I love turning flaky tests into reliable checks and helping teams ship confident software faster.…Hi, I’m Lukas Müller. I’m a Senior QA Engineer focused on web-based data applications for D2C and AdTech platforms. I blend robust manual testing with scalable automation to improve release quality and CRO. I enjoy building end-to-end test strategies, mentoring teammates, and collaborating with product and engineering to reduce defects and accelerate delivery. Based in Berlin, I work remotely with cross-functional teams, bringing a pragmatic, friendly approach to QA and continuous improvement. I love turning flaky tests into reliable checks and helping teams ship confident software faster.

Available to hire

Hi, I’m Lukas Müller. I’m a Senior QA Engineer focused on web-based data applications for D2C and AdTech platforms. I blend robust manual testing with scalable automation to improve release quality and CRO. I enjoy building end-to-end test strategies, mentoring teammates, and collaborating with product and engineering to reduce defects and accelerate delivery.

Based in Berlin, I work remotely with cross-functional teams, bringing a pragmatic, friendly approach to QA and continuous improvement. I love turning flaky tests into reliable checks and helping teams ship confident software faster.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior QA Engineer at Dvinci Group

January 1, 2024 - Present

Led end-to-end testing for web-based D2C and AdTech suites, migrating test suites to Playwright and Selenium and increasing automated coverage to 82% across 45 pages within 4 months. Implemented CI/CD integration with Jenkins and GitHub Actions, enabling daily test runs and reducing release validation time by 58% across 12 weekly deployments. Established data-driven validation with SQL against PostgreSQL, authored 200+ data integrity checks, and maintained 300+ automated test cases in Python and TypeScript. Mentored QA engineers, coordinated triage sessions in JIRA, and reduced escaped defects in production. Streamlined logging with Sentry/DataDog to capture telemetry on failed runs and accelerated root cause analysis.

QA Engineer at Klarna

February 1, 2020 - December 1, 2023

Led cross-functional QA efforts for a consumer payments web app supporting 3 million monthly users, coordinating regression releases across 8 engineering teams and 4 product squads. Designed API contract tests with Postman and automated validations, catching 18 integration defects before rollout and protecting critical payment flows. Improved automation reliability by introducing flaky-test detection and rollback policies, cutting flaky tests by 39% across Selenium and Cypress suites. Executed SQL-driven backend validation against PostgreSQL for reconciliation workflows (200+ data integrity checks), and documented QA processes in Confluence to standardize pre-release checks and reduce hotfix frequency by 28% over 12 months. Streamlined end-to-end CI pipelines in GitLab CI across parallelized test batches, reducing mainline build times from 90 to 26 minutes. Performed accessibility and usability spot checks (56 issues) across checkout flows and collaborated with UX to close 91% within t

Junior Software Developer at Rakuten

July 1, 2016 - January 1, 2020

Developed unit and integration tests for consumer-facing features using JavaScript and Jest, raising core module coverage from 38% to 71% over 18 months. Built API mocks and test harnesses to simulate third-party platforms, enabling functional testing of 12 contract scenarios without external dependencies. Created SQL validations for nightly ETL jobs to improve data integrity and documented QA processes to support scalable test automation.