QA Engineer, AI Products

Job Description:
• Design and execute test strategies for LLM-powered features, including prompt regression testing, output evaluation, and hallucination detection
• Build and maintain automated evaluation pipelines (eval sets, golden datasets, LLM-as-judge frameworks) to catch quality regressions in non-deterministic outputs
• Perform black-box and exploratory testing of MDCalc's AI features across web and mobile, with particular attention to clinical accuracy, safety, and edge cases
• Define quality metrics for AI outputs (accuracy, faithfulness, relevance, safety, latency, cost) and establish thresholds for release readiness
• Collaborate cross-functionally with engineers, product managers, ML/AI engineers, and clinical reviewers to define what "good" looks like for AI responses
• Investigate and triage AI failure modes, distinguishing model issues, prompt issues, retrieval issues, and integration bugs
• Participate in team discussions, offering feedback on testability, risks, prompt design, and guardrails
• Help develop QA strategies to expand future testing capacity, automation, and evaluation coverage as the AI product surface grows

Requirements:
• 5+ years of experience in software QA, with at least 1 year of hands-on testing of LLM-based or AI/ML-powered features
• Strong understanding of QA principles, test case creation/documentation, and best practices for both deterministic and non-deterministic systems
• Hands-on experience with LLM tooling and concepts: prompt engineering, RAG systems, evaluation frameworks (e.g., Promptfoo, Braintrust, LangSmith, DeepEval, Ragas, OpenAI Evals), and LLM APIs (OpenAI, Anthropic, etc.)
• Experience designing automated qualitative evaluation approaches, including LLM-as-judge, rubric-based scoring, semantic similarity checks, and golden dataset regression testing
• Proficiency with test automation tools, with a focus on Playwright
• Strong SQL skills for data validation, test data creation, and verifying data integrity across systems
• Familiarity with token usage, latency profiling, and cost monitoring as quality signals
• Eagerness to learn quickly and a positive, solutions-oriented attitude
• Clear and concise communicator, able to surface issues, blockers, and risks effectively when communicating ambiguous or probabilistic failures
• Self-motivated, proactive, and able to manage time and priorities independently

Benefits:
• Ability to make a true difference in medicine: MDCalc is the most broadly used medical reference by physicians, used by over 65% of US attending doctors weekly
• Medical, Dental, & Vision Coverage, with option to extend to your dependents
• Company-sponsored short-term insurance
• Fully-paid 8 week parental leave, after 6 months of employment
• Company-sponsored 401k, after 3 months of employment
• Unlimited vacation for salaried roles - we trust you to take the time you need
• Bi-annual company offsites to connect, reflect, and plan together
• Work from home monthly stipend
• A culture of fun and motivated team members who believe in a greater mission here at MDCalc