DescriptionSenior QA EngineerWe build and operate the financial backbone of the hair and beauty industry across 13 European countries. This role focuses on the critical intersection between Treatwell Connect, our SaaS platform used by tens of thousands of salon owners, and our Marketplace application used by millions of final customers. We are shaping a dedicated Payments QA automation function to ensure that every transaction, from a client booking on the app to a salon manager processing a checkout, is seamless and secure.

We've seen firsthand that embedded, proactive QA is what separates reliable financial systems from reactive firefighting.We're looking for a Senior QA engineer who is passionate about quality as a team discipline: someone who builds automation foundations, runs effective exploratory testing, and shifts how the people around them think about quality, not just how they personally test.You will be responsible for: Work with developers to build shared ownership of quality across engineering: encourage better unit testing, help them understand what good coverage looks like, and shift quality from a QA concern to a team habit.Mentor QA team members into more technical and structured testing practice.Run exploratory testing to surface edge cases and failure modes that specs don't anticipateOwn feature aftercare: monitor releases in production, track stability, and drive continuous improvement from what you find.Track QA metrics that matter, bug detection rate, release confidence, post-release defect counts, and own the narrative around what they mean for the product.Our QA contextOur Payments context is uniquely complex, spanning our SaaS management tool, our consumer Marketplace and the accounting logic around every payment. In this greenfield position within our Payments domain, you are empowered to reshape our testing evolution.

Your mission is to establish a pragmatic,



immediate framework that enhances delivery speed without causing friction, while architecting a robust, long-term testing strategy.About you:7+ years of QA experience with hands-on automation work and structured manual and exploratory testing. You take satisfaction from shifting how a team thinks about testing, not just from shipping test suites. Quality culture is something you actively build, not something you leave to others.You influence without authority: you bring developers, designers and product closer to quality, and the habits you build outlast your direct involvement.You want to make the people around you better, and you're patient enough to do it consistently.Experience as Technical/XP CoachExperience with observability and monitoring tools, particularly Datadog.

Knowing how to read production signals and connect them to your testing strategy is a meaningful advantage.Experience working across web, mobile, and API surfaces in a single product.

Experience with SQL for data validation, debugging, and exploratory testing. Ability to write queries to trace data flows, verify backend logic and support root cause analysis across distributed systems is a plusAbout TreatwellHi, we’re Treatwell. We’re the industry’s smartest salon management software, all connected to Europe’s leading bookings platform, working with over 50,000 salon partners across 13 countries, processing over 8 million bookings every month.

We’re on an exciting journey to digitally revolutionise the hair and beauty community.We’ll treat you with:28-days holiday, plus bank holidaysMonthly 40 Treatwell vouchers so you can treat yourself tooMental health support through our partnership with PlummGrowth funds for you to develop and grow with your teamEqual Ops We are committed to fostering a diverse, inclusive, and equitable workplace and are proud to be an equal opportunity employer. All qualified applicants will receive consideration without regard to their condition.Job SummaryID: 940AF9D203Department: TechType: full time

📌 Senior Engineer, Software Test Engineering (Madrid)
🏢 Treatwell
📍 Madrid