Heli S.

Senior QA Engineer | Playwright | Manual & Automation | API & Security

I am a Software Development Engineer in Test (SDET) with 8+ years of experience delivering quality assurance across SaaS platforms, web applications, hardware-integrated systems, and API-driven products. I hold a CompTIA Security+ certification and a postgraduate diploma in Network Security, which means I bring a security-conscious mindset to every engagement not just functional testing. I am 100% Job Success and Top Rated on Upwork, and I have worked directly with development teams, product leads, and founders to ship better products faster. What I Deliver Manual and exploratory testing - I test like a real user and like someone trying to break things. I find what automation misses and document it so clearly that developers can act without a single follow-up question. Playwright automation - I have built Playwright (TypeScript) regression suites from scratch using Page Object Model, reusable fixtures, and CI/CD integration, reducing manual regression effort by approximately 70% across multiple release cycles. API testing- I have validated 50+ REST API endpoints using Postman and Playwright's APIRequestContext, covering authentication flows, error handling, edge cases, and data integrity. Security testing - I perform basic web application security testing using Burp Suite, aligned with OWASP Top 10, including HTTP traffic interception, request manipulation, input validation testing, and broken access control verification. Hardware and firmware testing - I have tested encoder/decoder platforms, device WebUIs, and firmware across Alpha, Beta, and production releases at enterprise level. Tools and Stack Playwright (TypeScript), Postman, Burp Suite, JIRA, Linear, Qase, TestRail, Chrome DevTools, Wireshark, GitHub, Python, Agile/Scrum, CI/CD pipelines Devices and Browsers Windows - Chrome, Firefox, Edge iPhone 14 Pro - Safari and Chrome (iOS) Availability Based in Montreal, Canada (EST/EDT). Available for contract and freelance work, 30–40 hours per week. Open to trial engagements to establish fit.