Senior AI Test Automation Engineer

1 Opening
Madrid

Role description

We are looking for the very Top Talent…and we would be delighted if you were to join our team!

More in details, UST is a multinational company based in North America, certified as a Top Employer and Great Place to Work company with over 35.000 employees all over the world and presence in more than 35 countries. We are leaders on digital technology services, and we provide large-scale technologic solutions to big companies.

What we look for?
We are looking for a Senior AI Test Automation Engineer to lead and evolve the test automation strategy for an advanced AI & MLOps platform. You will combine strong hands-on expertise in Python-based automation with the ability to design scalable frameworks and ensure quality across complex systems, including APIs, UIs, data pipelines, and AI/ML-driven components such as LLMs and RAG systems.

You bring a product mindset, end-to-end ownership, and experience working in Agile/SAFe environments, with a strong focus on quality engineering, reliability, and automation at scale. Exposure to AI/ML testing or a strong motivation to grow in this area is key.

Main tasks and accountabilities will be:

Own the design, architecture, and evolution of the test automation framework for the AI & MLOps platform
Define and implement scalable, reusable automation patterns (UI, API, data, BDD)
Automate test cases using Python stack (Playwright, pytest, requests, pytest-bdd/Behave) applying clean code practices
Design and execute AI/ML-specific tests (e.g., LLM evaluation, RAG validation, non-deterministic outputs)
Integrate and orchestrate automated tests within CI/CD pipelines (GitLab), ensuring reliable execution across environments
Provision and manage test environments using Docker and Kubernetes
Plan and execute regression, smoke, and release test suites across DEV, INT, UAT, and pre-PROD
Monitor execution quality, manage flaky tests, and ensure trustworthy test results
Analyze defects, perform root cause analysis, and report issues with clear evidence in Jira
Ensure full traceability from requirements to test execution and reporting
Collaborate with cross-functional teams (ML Engineers, MLOps, Data Engineers, Product Owners)
Act as Test Automation Ambassador, promoting best practices and guiding teams on tooling and strategy
Ensure compliance with test policies, audit requirements, and data privacy standards

What do we expect from you?

5–7+ years of experience in test automation with strong hands-on Python expertise
Proven experience designing and owning automation frameworks (not just writing tests)
Solid experience with Playwright, pytest, API testing, and BDD frameworks
Experience integrating automation into CI/CD pipelines (GitLab or similar)
Knowledge of Docker and basic Kubernetes concepts
Understanding of microservices, APIs, authentication, and distributed systems
Exposure to AI/ML systems or strong interest in testing LLM-based and AI-driven applications
Experience with test reporting, parallel execution, and flaky test handling
Familiarity with Agile/SAFe environments and DevOps practices
Experience with Jira and test management tools (e.g., Xray)
Strong communication, ownership, and collaboration skills
Awareness of security, data privacy, and working in regulated environments (finance, healthcare, etc.)
Fluent English

Work Location
Hybrid position in Madrid (3 days at client´s office, Sol area, next to the underground).

Work Schedule

Business hours (40 hours weekly with 1 hour for lunch).

What can we offer?

23 days of Annual Leave plus the 24th and 31st of December as discretionary days!

Numerous benefits (Health Care Plan, teleworking compensation, Life and Accident Insurances).

`Retribución Flexible´ Program: (Meals, Kinder Garden, Transport, online English lessons, Health Care Plan…)

Free access to several training platforms

Professional stability and career plans

UST also, compensates referrals from which you could benefit when you refer professionals.

The option to pick between 12 or 14 payments along the year.

Real Work Life Balance measures (flexibility, WFH or remote work policy, compacted hours during summertime…)

UST Club Platform discounts and gym Access discounts

If you would like to know more, don’t hesitate to apply and we’ll get in touch to fill you in detail. We are waiting for you!

In UST we are committed to equal opportunities in our selection processes and do not discriminate based on race, gender, disability, age, religion, sexual orientation or nationality. We have a special commitment to Disability & Inclusion, so we are interested in hiring people with disability certificate.

Skills

python,playwright,api testing,pytest-bdd,

About UST
UST is a global digital transformation solutions provider. For more than 20 years, UST has worked side by side with the world’s best companies to make a real impact through transformation. Powered by technology, inspired by people and led by purpose, UST partners with their clients from design to operation. With deep domain expertise and a future-proof philosophy, UST embeds innovation and agility into their clients’ organizations. With over 30,000 employees in 30 countries, UST builds for boundless impact—touching billions of lives in the process.