Senior QA Automation Engineer (Python | Selenium | Pytest)

3Pillar is an AI transformation partner on a mission to help enterprises build the AI-native products and intelligent agents that will define the next era of business. With teams across North America, Europe, Latin America, and Asia, we work with the most ambitious companies in financial services, healthcare, media, and technology — helping them move faster, modernize boldly, and compete on their own terms. Our HelixAI platform and Helix Pods delivery model put our engineers at the center of real agentic transformation — doing work that is open, portable, and built to last. We are building the future of enterprise AI. Senior QA Automation Engineer You'll own test architecture and semantic validation for a mission-critical AI-powered system where consistency guarantees are non-negotiable . This isn't traditional QA; you're designing test harnesses that prove AI outputs are correct, not just crash-free. Your core responsibility: build a golden-set validation harness that measures whether the system's LLM stage produces the right decisions at the right confidence levels. You'll design automated tests across unit, integration, E2E, and access-control layers. You'll also establish CI/CD quality gates that block bad builds—schema validation failures, cross-tenant isolation defects, missing floor controls, semantic inconsistencies—before they reach production. This is front-loaded work (weeks 1–5), then you support the team through delivery. You'll mentor a junior test engineer and set the standard for test coverage in a compressed timeline.