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Manual QA Engineer

Remote from
Ukraine flag
Ukraine
Annual salary
Undisclosed
Salary information is not provided for this position. Check our Salary Directory to estimate the average compensation for similar roles.
Department
QA & Testing
Employment type
Full Time,
Job posted
Apply before
9 Jul 2026
Views / Applies
54 / 17
About company Share

About Ruby Labs

Crafting Consumer Products of Tomorrow

Actively Hiring
Verified job posting
This job post has been manually reviewed for authenticity and compliance.

AI Summary

This role is for a Manual QA Engineer at Ruby Labs, a tech company creating consumer products in health, education, and entertainment. The position focuses on testing a payments platform in a Kanban/continuous delivery environment, requiring strong manual testing and API validation skills. Key responsibilities include risk-based testing of payment flows, API/webhook validation, maintaining regression suites, and collaborating with engineers and PMs. Candidates need 3+ years of QA experience, proficiency in Postman and SQL, and comfort with fast-changing requirements. The job offers remote work, unlimited PTO, and a MacBook, with a preference for candidates within ±4 hours of CET.

Role DNA

Job Complexity
Easy Hard
Pace & Pressure
Relaxed Fast-paced
Autonomy Level
Guided Full Ownership
Communication Load
Independent Highly Collaborative
AI Insight The role is challenging due to the critical nature of payment systems, risk-based testing, and the need to handle frequent releases and hotfixes without strict sprint cycles.

Salary Analysis

Median Market Rate
$90,000
US Market
$65k – 130k
0 $143k
AI Insight The salary is not specified, but based on market data for a QA Engineer with 3+ years in manual and API testing, the estimated median is $90,000. This is competitive for the US market, though actual offer may vary based on location and experience.

Key Skills

Manual Testing API Testing Postman SQL Regression Testing Risk-Based Testing Kanban Payments Webhooks PostgreSQL

I am excited to apply for the Manual QA Engineer position at Ruby Labs. With over 3 years of experience in manual testing, particularly in API-heavy environments, I have a strong background in validating complex payment flows and ensuring system stability.

My expertise includes risk-based testing, developing regression suites, and collaborating with cross-functional teams to deliver high-quality releases. I am proficient in Postman, SQL, and monitoring tools, and I thrive in fast-paced, Kanban-style settings.

I am drawn to Ruby Labs' innovative portfolio and the opportunity to work on critical payment infrastructure. I am confident that my skills in manual QA and API testing will contribute to maintaining the platform's reliability.

Thank you for considering my application. I look forward to the possibility of discussing how I can add value to your team.

Describe your approach to risk-based testing for a payment flow that involves multiple payment methods and error scenarios.
I would prioritize test cases based on the likelihood and impact of failure. For payment flows, critical paths include successful authorization, capture, and refund. I would test edge cases like timeouts, declined transactions, and invalid card numbers. I'd also verify idempotency and retry mechanisms. Using a risk matrix, I'd focus on high-risk areas like 3DS authentication and webhook reliability.
How do you handle testing when there are no strict sprint cycles and requirements change frequently?
In a Kanban environment, I rely on lightweight test plans and continuous communication. I clarify requirements with engineers and PMs early, and create modular test cases that can be quickly adapted. I maintain a prioritized regression suite for critical paths and use risk assessment to decide what to test. I also document test scope per release and flag risks promptly.
Can you explain how you would verify a webhook integration for a payment gateway?
I would first review the webhook documentation to understand event types and payloads. Then, using Postman or a webhook testing tool, I would simulate events like payment success and failure. I'd verify the receiver processes the payload correctly, updates the database, and responds with a 200 status. I'd also test idempotency keys to ensure duplicates are handled. Lastly, I'd monitor logs in Kibana for any errors.
Describe a time you turned a production incident into a test case. What was the outcome?
In a previous role, a production outage occurred due to a missing authorization step in a refund flow. I analyzed the incident, identified the gap in test coverage, and created a new regression test that simulates a refund without prior authorization. This test was added to the CI pipeline, preventing recurrence. The outcome was improved system reliability and reduced future incidents.
How do you validate data consistency in PostgreSQL when testing payment state transitions?
I write SQL queries to check state transitions in relevant tables. For example, after a payment is captured, I verify the transaction status changes from 'authorized' to 'captured' and that the balance updates correctly. I also test joins between orders and transactions to ensure referential integrity. Using transactions, I roll back changes to avoid polluting test data and leverage idempotency checks.

About us

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/

About the role

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.

Key Responsibilities

  • 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).

Qualifications

  • 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.

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

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

Location

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.

Benefits

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/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt

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

Interview Process

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)

Life at Ruby Labs

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.

#LI-Remote

Apply now >

Annual salary information is not provided for this position. Explore salary ranges for similar roles in our Salary Directory ›

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