At Ultralytics, we commit to relentless innovation in the AI space and seek team members who resonate with our ambition to produce the world's best YOLO AI models. This full-time Senior Quality Assurance Engineer position is based in our Ultralytics office in Shenzhen, China, with a hybrid model of 3 days in-office and 2 days remote.
As a Senior Quality Assurance Engineer at Ultralytics, you will help ensure the quality, reliability, and performance of the Ultralytics Platform and our YOLO-powered workflows and APIs. Designing and maintaining automated test suites for our backend services, web UI, and APIs using TypeScript and tools like Playwright .
Leading end-to-end and browser-based testing strategy for our frontend using Playwright Test .
Writing and maintaining API and integration tests for Next.js API routes, server components, and serverless deployments on Vercel.
Validating data integrity and edge-case behavior across workflows that touch MongoDB , training pipelines, and inference services.
Owning test infrastructure within CI/CD using GitHub Actions , improving test reliability, parallelization, and signal-to-noise.
Establishing testing patterns and best practices across a Turborepo monorepo with multiple apps.
Mentoring junior engineers on testing strategies, code review, and quality-first development.
Collaborating with Engineering and Product to clarify requirements, define acceptance criteria, and catch issues early.
Contributing to internal QA documentation, test plans, and release readiness checks.




Your attention to detail and willingness to learn will be essential in supporting Ultralytics' mission of delivering top-tier machine learning tools and models to the community.
5+ years of experience in QA, test automation, or software engineering, with strong proficiency in TypeScript , Python , or both.
~ Deep expertise with Playwright for browser automation and end-to-end testing.
~ Solid understanding of API testing (REST/JSON), backend integration testing, and server component testing patterns.
~ Experience with modern web stacks including Next.js , React , TypeScript , serverless deployments ( Vercel ), and cloud infrastructure ( GCP ).
~ Proficiency with CI/CD systems (especially GitHub Actions ), test gating, and pipeline optimization.
~ Familiarity with MongoDB and database testing strategies.
~ Proven ability to establish testing standards and mentor team members.
~ Strong problem-solving skills and a track record of improving quality processes in fast-paced environments.
~ Cultural fit
Ultralytics is a high-performance environment for world-class talent obsessed with achieving extraordinary results. Hybrid flexibility: 3 days per week in our brand-new office — 2 days remote.
Generous time off: 24 days vacation, your birthday off, plus local holidays.
Adaptable working hours: Tech: Engage with cutting-edge AI projects.
Gear: Brand-new Apple MacBook Air/Pro, Apple Studio Display, and AirPods Pro 3.
Comprehensive guide to our company's mission, vision, values, and operational practices.

📌 Senior Quality Assurance Engineer (Madrid)
🏢 Ultralytics
📍 Madrid