Responsibilities
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- We are seeking a Senior QA Engineer to join our Card Processing team

- You will design and build the quality systems that keep our payment platform reliable at scale - in an environment where new code is produced using AI tooling and judgment is the bottleneck, not generation speed

- This is not a traditional “write and execute test cases” role

- We believe software engineers own their tests — your job is to make them better at it

- You will own the sensor strategy that catches what AI gets wrong, verify that test intent matches business requirements, and raise the quality bar for the entire team

- Design and implement layered quality sensors across our CI/CD pipeline — from static analysis to AI-driven code review passes

- Improve and maintain E2E test suites for critical payment flows (card authorisation, clearing and settlement, tokenisation, 3D Secure)

- Review PRs for test intent alignment — ensuring AI-authored and human-authored code meets the same quality bar

- Identify test coverage gaps and prioritise them by risk (customer impact, regulatory exposure)

- Build load testing and performance validation frameworks

- Collaborate with the team on quality strategy — you raise the bar, you don’t gatekeep it

- Explore chaos engineering approaches to validate system resilience

- Contribute to audit-trail thinking — ensuring generated diffs and suppressed checks are traceable and defensible

Benefits

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- Ongoing learning and development opportunities





- Retirement planning

- Charitable donation matching

- Volunteer opportunities

- Employee development fund

- Monthly happy hours

- Free haircuts in our salon located at HQ

- Complimentary dry cleaning at HQ

- Valet parking at HQ

- Shuttle service to/from NYC

- Gym located at HQ

- River Cafe at HQ

Qualifications

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- Strong proficiency in English — written and verbal

- Familiarity with CI/CD pipelines, containerisation, and infrastructure-as-code

- Experience testing RESTful APIs and event-driven systems

- Strong analytical thinking — you pull bugs back to the spec, not just the code

- Excellent communication skills — this role enables and mentors, not just audits; you need to teach, not agitate

- 5+ years in software engineering with a strong focus on quality and xqbhyrx testing (equivalence partitioning, boundary analysis, risk-based prioritization)

- Comfort with regulated environments — you think in terms of audit trails, blast radius, and data classification

- Demonstrated AI fluency — you use AI assistants daily, you know when they’re wrong, and you know when not to use them

- Proficiency in Go (or strong willingness to learn — test-design thinking matters more than language syntax)

- Understanding of failure modes in distributed systems (event ordering, retries, idempotency, eventual consistency)

- Experience using observability platforms (Datadog, New Relic, Elasticsearch, Grafana) to investigate issues and validate system behaviour

- Knowledge of Domain-Driven Design (DDD) — bounded contexts, ubiquitous language, aggregate boundaries

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📌 Senior QA Engineer (Barcelona)
🏢 Cross River
📍 Barcelona