QA Engineer

TL;DR

QA Engineer (Payments): Maintaining the stability of a payments platform through manual testing, API validation, and data verification with an accent on risk-based testing and pragmatic regression strategies. Focus on end-to-end testing of payment flows, ensuring data integrity, and converting production incidents into regression test cases.

Location: Ukraine; Cyprus; Czech Republic; Estonia; Hungary; Kazakhstan; Latvia; Lithuania; Moldova; Poland; Romania; Serbia; Slovakia; Slovenia; South Africa; Turkey or any country within approximately ± 4 hours of CET.

Company

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries.

What you will do

• Validate new features, fixes, and hotfixes across Web UI and APIs through manual testing.
• Define test scope based on financial/customer impact and call out residual risks.
• Test REST APIs, async flows, and webhooks using Postman/Newman.
• Verify state transitions and side effects in PostgreSQL, understanding idempotency and retries.
• Maintain and continuously improve smoke and regression suites for critical payment routes.
• Convert production incidents into new regression cases or monitoring checks.

Requirements

• 3+ years in QA with strong manual testing fundamentals.
• Strong API testing skills (Postman/Newman, curl, Swagger/OpenAPI).
• Practical understanding of auth vs capture, refunds, webhooks, idempotency, and retries.
• Basic SQL (PostgreSQL): ability to validate records, joins, state transitions.
• Experience with logs/monitoring (Grafana, Kibana/ELK, Sentry or similar).
• Comfortable in Kanban / no-sprints / fast-changing requirements.
• Good English (written + spoken) for remote async work.

Nice to have

• Experience with PSPs (Stripe, Adyen, PayPal, Braintree, Worldpay, etc.).
• Experience with 3DS flows (frictionless vs challenge) and SCA constraints.
• Familiarity with test automation frameworks (pytest, Playwright) and CI.
• Understanding of network tokenisation (DPAN / network tokens).

Culture & Benefits

• Embrace the freedom to work remotely from anywhere, anytime, promoting a healthy work-life balance.
• Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
• Celebrate and relax on national holidays with paid time off to unwind and recharge.
• Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
• Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities with a Flexible Independent Contractor Agreement.

Hiring process

• Recruiter Screening (40 minutes)
• Final Interview (60 minutes)