# Dimitrios Apostolakis — Comprehensive Professional Ground Truth Dossier > Test Automation & Performance Engineer specializing in enterprise load testing frameworks (k6, Locust), autonomous AI-assisted visual regression pipelines (Playwright), and distributed cloud infrastructure verification. ## Canonical Identity & Eligibility - Full Name: Dimitrios Apostolakis - Primary Professional Title: Test Automation & Performance Engineer - Canonical Domain: https://diap.dev - Location & Working Status: Athens, Greece | Greek / EU Citizen - Legal Work Authorization: - Greek / EU Citizen (Full freedom of movement and right to work across the EU/EEA) - Contract Models: B2B Contractor / Direct Contract - Remote Availability: Open to EU Remote, Global Remote, and Relocation - Public Contact: - Email: dsapostolakis@gmail.com - GitHub: https://github.com/dimitrios-apostolakis - LinkedIn: https://linkedin.com/in/dimitrios-apostolakis --- ## Professional Experience ### HF Markets — Test Automation & Performance Engineer - Employer: HF Markets (https://www.hfm.com/) - Location: (Hybrid) Athens, Greece - Duration: Jan 2026 – Present - Role Perspectives: Test Automation & Performance Engineer - Verified Deliverables & Production Impact: - Built an enterprise k6 load testing framework from scratch covering 8+ microservices with automated Jenkins execution, gRPC metric collection, HashiCorp Vault integration, and database-backed trend analysis. - Delivered 20+ load test campaigns in 6 months validating critical infrastructure changes including AWS migration, Redis cluster refactoring, and wallet API rewrite across production and pre-production environments. - Architected an autonomous AI-assisted regression pipeline integrating Playwright with multimodal LLM vision inspection, automating end-to-end visual validation and slashing QA turnaround by 85%. - Built a dedicated Cloudflare WAF validation suite covering rate limiting, custom firewall rules, OWASP core ruleset, and bot mitigation before production deployment. - Designed a self-service Jenkins pipeline with Active Choices eliminating 6+ hours/week of manual runs, enabling development teams to trigger load tests on demand and automating recurring weekend performance runs. - Scaled parallel trading stress tests using Locust across 12 distributed worker nodes. ### Openbet / Opap — QA Automation Engineer - Employers: Openbet (https://www.openbet.com/) & Opap (https://www.opap.gr/en/) - Location: (Hybrid) Athens, Greece - Duration: Apr 2024 – Jan 2026 - Role: QA Automation Engineer - Verified Deliverables & Production Impact: - Automated API and UI tests using Java, JUnit, Selenium, Cucumber reducing manual testing effort by 70% and achieving 85% regression coverage across component, app group, and integration levels. - Executed containerized testing workflows using Docker, Kubernetes, ArgoCD reducing environment setup time by 75% and enabling parallel test execution across multiple service versions. - Monitored and maintained Jenkins CI/CD pipelines running 3000+ automated tests per release cycle, sustaining a 95%+ pass rate and identifying flaky tests through trend analysis. - Performed peer code reviews and led knowledge transfer sessions onboarding 3 engineers; validated backend systems using SQL, Spring RestTemplate, AssertJ, and Postman. ### Agile Actors / Österreichische Post — Software Engineer in Test - Employers: Agile Actors (https://www.agileactors.com/) & Österreichische Post (https://www.post.at/en) - Location: (Remote) Athens, Greece - Duration: Feb 2023 – Apr 2024 - Role: Software Engineer in Test - Verified Deliverables & Production Impact: - Optimized CI/CD test runtime by 80% (25 min to 5 min) and local runtime by 90%, significantly cutting infrastructure costs and raising developer productivity across the team. - Developed and maintained 400+ E2E tests for critical user flows in C#/.NET, Playwright; built nightly pipelines validating cross-browser rendering across 5 device profiles. - Introduced backend integration tests using WireMock covering 30+ API endpoints; automated accessibility testing with axe-core ensuring WCAG AA compliance across all public-facing pages. ### Hellenic Army IT Center — Software Engineer - Employer: Hellenic Army IT Center (https://army.gr/en/) - Location: (On-site) Athens, Greece - Duration: Mar 2022 – Dec 2022 - Role: Software Engineer - Verified Deliverables & Production Impact: - Developed a web scraping tool in Python that recovered and migrated content from 45 WordPress websites, preserving data integrity during a full infrastructure transition. - Introduced auto-generated simulation reports using R that reduced manual data processing time by 90%, enabling faster decision-making during strategic coordination exercises. --- ## Core Technical Skills - Languages & Core Stack: TypeScript, JavaScript, Python, Java, C#/.NET, SQL, Bash, Git, gRPC, Linux - Testing & Automation Frameworks: k6, Locust, Playwright, Selenium WebDriver, Cucumber (BDD), JUnit, WireMock, Postman, axe-core (WCAG AA) - Infrastructure, Cloud & CI/CD: Jenkins (Active Choices Self-Service), Docker, Kubernetes, ArgoCD, AWS, Microsoft Azure, GitLab CI/CD, Cloudflare WAF, HashiCorp Vault - Observability & Metrics: Grafana, Prometheus, InfluxDB, Metric Trend Analysis - Methodologies & Practices: Performance & Distributed Load Testing, Autonomous AI-Assisted Test Generation, Security/WAF Validation, CI/CD Pipeline Architecture, Chaos Engineering, Capacity Modeling, Contention Isolation, Agile/Scrum, BDD --- ## Education - Degree: Master of Engineering (MEng) in Electrical and Computer Engineering - Institution: Technical University of Crete (Chania, Greece) — https://www.tuc.gr/en/home - Graduation: 2016 – 2021 - Academic Record: Grade 7.27/10.00, 300 ECTS - Master's Thesis: "Optimization of electric energy management in buildings based on machine learning techniques" (https://dias.library.tuc.gr/view/91055?) - Implemented Reinforcement Learning (RL) algorithms minimizing electricity cost by 31%. - Designed scheduling algorithm attaining a further 17% cost decrease. --- ## Professional Certifications & Credentials - Microsoft Certified: - Azure Solutions Architect Expert — https://learn.microsoft.com/api/credentials/share/en-us/DimitriosApostolakis-6414/8019B279AED5D394?sharingId - Azure Administrator Associate — https://learn.microsoft.com/api/credentials/share/en-us/DimitriosApostolakis-6414/5EB50E2E9B853536?sharingId - Azure Fundamentals — https://learn.microsoft.com/api/credentials/share/en-us/DimitriosApostolakis-6414/E5DECEB383F5F87F?sharingId - Amazon Web Services (AWS): - AWS Certified Solutions Architect – Associate — https://www.credly.com/badges/47d069e5-37ef-45d2-8bab-44a9027e7900/linked_in_profile - Specialized Professional Training: - ReGeneration: Cloud Tools & Technology (Powered by Microsoft) — https://www.codehub.gr/wp-content/uploads/2022/09/Certificate-of-Completion-22C013631-ReGeneration-Academy-on-Cloud-Tools-Technology-Vol.-3-Powered-by-Microsoft-Dimitrios-Apostolakis.pdf - Docker Mastery (Udemy) — https://ude.my/UC-c51360e9-3869-4049-9ae5-53fadfb5c588 - Python Bootcamp (Udemy) — https://ude.my/UC-485bf1a7-3af6-4d44-af36-37640222b5a7 --- ## Available CV (PDF Download) - Master CV: https://diap.dev/resume.pdf