06/29/2026 updated

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AI Quality and LLM Evaluation Engineer | Senior SDET | RAG & Agentic Systems Testing

Bucharest, Romania
Only remote
Bachelor in Applied Informatics and Automation, Hyperion University of Bucharest (2015-2019)
Bucharest, Romania
Only remote
Bachelor in Applied Informatics and Automation, Hyperion University of Bucharest (2015-2019)

Profile attachments

Marius_Argatu_Resume 2026.pdf

AI AgentsLLMTesting (Software)Agile TestingAcceptance Test-Driven DevelopmentAtlassian JiraTest AutomationAutomated Testing FrameworkCloud TestingDebuggingLoad TestingData Driven TestsSystem TestingTest DesignTest Execution EngineTest ManagementTesting StrategiesUser Interface TestingDatadogTestingTest-Driven Development (TDD)Artificial Intelligence Markup Language (AIML)TestrailJenkins
AI / LLM Testing
Expertise with DeepEval, RAGAS and Langfuse for LLM evaluation, including traces, prompt versioning, dataset management and evaluation runs. Proficiency in golden dataset regression, faithfulness, answer relevancy and hallucination detection, as well as RAG retrieval metrics such as hit rate, MRR, precision/recall@k and context relevancy. Agentic system testing covering multi-turn state, tool and function calling, and planning loops.

Test Frameworks and Automation Design
Hands-on experience with Playwright (UI, API, Component), Selenium, Cypress and Vitest. Framework and runner design, model based testing with xState, and application of POM and Screenplay patterns to build scalable, maintainable test infrastructure.

CI/CD, Infra and Observability
Practical knowledge of GitLab CI, GitHub Actions, Jenkins, Git, Docker and Kubernetes. Integration of monitoring and observability tools including Datadog, OpenTelemetry and Grafana, with experience in trace driven debugging and connecting evaluation harnesses into CI/CD pipelines as release gates.

Programming Languages
Primary development in Python and TypeScript, used for building production APIs, test frameworks, automation pipelines and evaluation harnesses.

API and Property Based Testing
Experience with Schemathesis, Hypothesis and fast-check for property based testing. Pydantic schema validation and REST, GraphQL, OpenAPI first approaches, with Postman for API exploration and testing.

Test Management and Process
Proficiency with Jira, Xray, TestRail, Qase.io and Allure for test management. Application of shift left and shift right strategies, testing trophy and diamond models, regression planning and release gate decision making.

Model Based Testing
Building model based test systems using xState, enabling generation of large numbers of test scenarios from a single state machine definition and automatic adaptation when product permissions change.

QA Process Design
Experience building QA processes from zero in multiple companies, owning quality strategy within feature squads, reviewing developer-written tests, advising on coverage gaps and test pyramid placement.

Languages

EnglishFluentRomanianNative speaker

Project history

Senior SDET

Coherent Solutions - Senior SDET, Airline / Payments Platform (embedded)
Built an internal LLM-powered debugging agent connecting failing test output with Datadog traces, stack traces and recent Jira changes to reduce bug triage time from hours to minutes. Owns quality strategy within the feature squad, maintains and extends the API test framework, applies shift left approach, uses agentic workflows for MCP servers, slash commands and test maintenance, and is responsible for regression planning and release gate decisions in the payments domain.

Senior SDET

Coherent Solutions - Senior SDET, Healthcare SaaS / Multitenant Platform (embedded)
Built LLM evaluation for a RAG assistant answering researcher questions based on FDA and EMA guidance, separating retrieval quality from generation quality using RAGAS and Langfuse with CI execution. Built a model based testing system for the permissions matrix using xState generating around 1,000 test scenarios. Built a Playwright and TypeScript test platform with POM and tenant/role isolation. Created an AST-based migration tool translating Karate DSL to TypeScript and Playwright. Served as framework SME for onboarding, test pattern reviews and cross-cutting changes.

Senior SDET

Coherent Solutions - Senior SDET, Enterprise Desktop Qt based (embedded)
Built a custom Pytest plugin running dependent API tests in parallel with order resolved by a DAG, reducing runtime while maintaining correctness. Patched and rebuilt the Chromium fork of Qt WebEngine to expose the remote debugging port, enabling replacement of Appium with Selenium through CDP and reducing effort per test from 4 days to 1 day.

Senior QA Automation Engineer

LSEG (London Stock Exchange Group)
Designed a cross-platform automation framework in Python using the Screenplay pattern, covering an SPA with Playwright and a Windows desktop client with WinAppDriver. Delivered an end-to-end suite that reduced manual regression on the desktop side and maintained Jenkins pipelines.

QA Automation Engineer

2Checkout (Payments / Ecommerce)
Led the design of a Pytest automation framework for complex ecommerce and payment workflows, reducing execution time through parallelization. Built a database diff tool allowing QA to snapshot and restore environments locally.

QA Tester / Senior QA Tester / Backend Engineer

AMBER
Started with writing test cases and running regression cycles, then owned end-to-end integration testing of REST services. Later shipped production APIs in Python and Flask, performed load testing with k6 and maintained CI/CD on Docker and Kubernetes.

QA Tester

Electronic Arts (EA)
Performed end-to-end feature testing for AAA game titles on multiple platforms.

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