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criguex/README.md

Cristian Guerra — Senior SDET · The Mutant Lab

LinkedIn Location Open to remote contract roles — message me on WhatsApp

About

Senior SDET with 7+ years in test automation, mostly in fintech and banking. I design automation frameworks from zero, test APIs and web apps end to end, and put quality gates into CI.

Lately most of my work is testing what AI builds: making verdicts measurable when outputs are not deterministic, and using AI assistants to design and explore tests faster while a person still signs off.

Featured work

Project What it shows Stack
qa-eval-lab Playwright UI tests and LLM evaluation (DeepEval + Promptfoo) wired into one CI eval-gate — my AI-QA / AI-Evaluation differentiator Playwright · TypeScript · DeepEval · Promptfoo · CI
mutant-lab Runnable experiments behind my posts: mutant scenarios, scoring AI output against acceptance criteria, a second brain for AI-assisted QA Playwright · TypeScript · CI
civica-playwright-challenge Production-shaped framework: Page Object Model, semantic locators, deterministic mock layer, accessibility checks, self-learning mutant scenarios Playwright · TypeScript · GitHub Actions
playwright-saucedemo-e2e Cross-browser E2E suite with POM and CI on every push Playwright · TypeScript
karate-api-testing Data-driven REST API testing with happy and failure paths Karate DSL · Java · Maven
serenity-screenplay-salesforce Screenplay pattern for business web flows with living documentation Serenity BDD · Java · Cucumber
selenium-cucumber-pom Classic layered web framework: drivers, hooks, page objects, test data Selenium · Java 17 · Cucumber

How I work

  • Golden flows first, then mutate them. One change per mutant; if the suite stays green, that's a finding.
  • API first, UI for evidence. Fast, stable checks at the service layer; the browser proves the user journey.
  • Deterministic verdicts for non-deterministic systems. Pass/fail where the spec allows it, scores against acceptance criteria where it doesn't, and the same input run 3 times.
  • Hard rules live in code, not in prompts. Hooks, CI gates and reviews that can't be forgotten.

Toolbox

Web & mobile: Playwright · Selenium · Cypress · Serenity BDD (Screenplay) · Appium API & performance: Karate DSL · REST Assured · Postman · k6 · JMeter Languages: TypeScript · JavaScript · Java · SQL CI & infra: GitHub Actions · GitLab CI · Jenkins · Docker Practices: BDD (Cucumber/Gherkin) · contract testing · test management with Jira/Xray · AI-assisted testing (Claude Code, Copilot, MCP)

Contact

Reach me on WhatsApp or LinkedIn. Open to remote contract roles in QA automation and SDET.

Pinned Loading

  1. serenity-screenplay-salesforce serenity-screenplay-salesforce Public

    Serenity BDD + Screenplay pattern in Java 17 (Cucumber, Selenium) automating Salesforce account creation and edit flows

    Java

  2. civica-playwright-challenge civica-playwright-challenge Public

    IMDb test automation framework — Playwright + TypeScript, Page Object Model, semantic locators (no XPath/CSS), deterministic mock fallback. Technical challenge.

    TypeScript

  3. karate-api-testing karate-api-testing Public

    REST API tests with Karate DSL and Maven against the public Makeup API: data-driven scenarios, schema matching, CI

    Gherkin 1

  4. mutant-lab mutant-lab Public

    THE MUTANT LAB · I test what AI builds. Runnable QA experiments: Playwright, mutant scenarios, AI verdicts, Obsidian.

    TypeScript

  5. playwright-saucedemo-e2e playwright-saucedemo-e2e Public

    End-to-end tests for SauceDemo with Playwright + TypeScript: Page Object Model, cross-browser runs on GitHub Actions

    TypeScript

  6. selenium-cucumber-pom selenium-cucumber-pom Public

    Selenium WebDriver + Cucumber BDD framework in Java 17: Page Object Model, shadow DOM handling, Cucumber HTML reports

    Java