Manual QA Engineer

Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/

We are looking for a QA Engineer (manual-first, API-heavy) to keep a payments platform stable during frequent releases and occasional urgent hotfixes. We don't run strict sprint cycles, so you should be comfortable in a Kanban / continuous delivery setup: clarifying scope, building lightweight test coverage, and shipping fast without breaking critical payment routes.

You will focus on risk-based testing of payment flows, end-to-end API validation (including webhooks), and maintaining pragmatic regression/smoke checklists that balance speed and safety.

• Manual testing: validate new features, fixes, and hotfixes across Web UI + APIs.

• Risk-based testing: define test scope based on financial / customer impact; call out residual risks.

• API / E2E validation: test REST APIs, async flows, and webhooks using Postman/Newman (or equivalent).

• Data validation: verify state transitions and side effects in PostgreSQL; understand idempotency and retries.

• Regression ownership: maintain and continuously improve smoke + regression suites for critical payment routes.

• Incident-to-tests: convert production incidents into new regression cases or monitoring checks.

• Collaboration: work closely with engineers/PMs to clarify requirements, reproduce issues, and verify fixes.

• Release reporting: provide concise QA notes per release (scope, result, risks, follow-ups).

• 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, 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.

• 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 (ability to read/maintain existing checks is a plus).

• Understanding of network tokenization (DPAN / network tokens).

Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.

Discover the perks of being part of our vibrant team! We offer:

• Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.

• Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.

• Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.

• Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.

• Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1tzxGX4Uu7Ts_HCLFXESKLnKaaBfVCPf1f9AYZPrkjJM/preview?tab=t.0

Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!

After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:

• Recruiter Screening (40 minutes)

• Technical Interview (60 minutes)

At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.

This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.

Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.

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