Senior QA Engineer - Web & Mobile

HHHUB, UAB; United States; Remote; USD 90,000 - 130,000; Full time

Benefits offered by this job

Fully remote

Job summary

HHHUB, UAB is seeking a Senior Manual QA Engineer to own QA for web and mobile products in a globally distributed fintech environment. You will proactively engage in test planning, designing scenarios, and validating complex payment journeys from onboarding to settlement.

You will collaborate with developers and product managers, perform functional, regression, and API testing, and ensure release readiness across international markets.

Qualifications

• Strong hands-on manual QA testing across web and mobile apps.
• Ability to independently plan, organize, and prioritise testing activities.
• Experience analysing incomplete requirements and clarifying gaps.
• Prepare test plans and scenarios during development, not after.
• Solid understanding of testing principles, defect lifecycles, and testing types.
• Practical API testing experience using Postman and OpenAPI/Swagger.

Responsibilities

• Own and independently plan QA activities based on requirements and release timelines.
• Analyse requirements, designs and specifications, identify gaps and clarify uncertainties.
• Prepare structured test plans, scenarios and documentation before feature completion.
• Coordinate with frontend and backend teams to ensure testing readiness.
• Conduct functional, regression, exploratory, usability and compatibility testing.
• Test APIs using OpenAPI specifications and maintain Postman collections.
• Validate end-to-end customer journeys including onboarding and transactions.
• Document defects with clear reproduction steps and logs.
• Lead requirements reviews and testing discussions with stakeholders.
• Contribute to QA process improvements and release readiness.

Skills

Manual QA testing

API testing

Web & mobile testing

Test planning

JSON structures

OpenAPI/Swagger

Tools

Postman

Swagger/OpenAPI

Job description

About the Company

Our client is a Cyprus-registered FinTech company developing payment solutions for individuals and international businesses. Its products help make digital assets practical for everyday and high-value transactions.

The platform covers customer onboarding, cryptocurrency exchange, merchant invoicing, card payments and fiat settlement through web, mobile and API-based services. The company operates internationally, with reliability, security and compliance at the heart of its customer experience.

About the Role

As a Senior Manual QA Engineer, you will take ownership of quality assurance across the company's web and mobile products, ensuring reliable and secure customer experiences throughout complex payment journeys.

This is a hands-on, independent role requiring proactive involvement throughout the product development lifecycle, from analysing requirements and preparing test plans to validating functionality and supporting releases.

You will work closely with developers and product stakeholders, identifying gaps, clarifying requirements and preparing testing scenarios while features are still in development.

Your work will directly impact customer trust across onboarding, KYC/KYB, cryptocurrency transactions, invoicing, payment tracking and settlement.

Responsibilities

• Own and independently plan QA activities, prioritising testing efforts based on product requirements, risks and release timelines.
• Analyse requirements, designs and specifications, identify gaps and proactively clarify uncertainties with Product Managers and developers.
• Prepare structured test plans, scenarios and documentation before feature development is completed.
• Work in parallel with frontend and backend teams to ensure testing readiness throughout development.
• Perform functional, regression, exploratory, usability and compatibility testing across web and mobile applications.
• Test APIs using OpenAPI specifications, creating and maintaining Postman collections based on API contracts.
• Validate end-to-end customer journeys, including onboarding, authentication, account management, transactions and settlement.
• Identify, document and investigate defects, providing clear reproduction steps, logs and supporting evidence.
• Independently initiate requirements reviews and test-plan discussions with relevant stakeholders.
• Contribute to improving QA processes, test documentation, release readiness and overall product quality.

Requirements

• Strong hands-on experience in manual QA testing across web and mobile applications, preferably within a product development environment.
• Proven ability to independently plan, organise and prioritise testing activities without detailed instructions or constant supervision.
• Experience analysing incomplete requirements, reviewing specifications and proactively identifying missing information.
• Ability to prepare test plans and scenarios during feature development, rather than waiting for completed functionality.
• Strong understanding of software testing principles, defect lifecycles and functional, regression and exploratory testing.
• Practical API testing experience using Postman and OpenAPI/Swagger specifications, including building test collections directly from API contracts.
• Solid understanding of JSON structures, including data types, key-value relationships and case sensitivity.
• Experience maintaining structured test documentation, identifying original sources of requirements and ensuring test coverage.
• Confidence investigating issues using browser developer tools, application logs and other diagnostic tools.
• Ability to independently coordinate requirements reviews and testing discussions with product and engineering teams.
• Strong analytical thinking, attention to detail and clear written and spoken English.

Nice to Have

• Experience testing FinTech, payments, banking, cryptocurrency or other financial-services products.
• Basic knowledge of SQL, HTTP requests and client-server architecture.
• Exposure to test automation or an interest in developing automation skills.
• Experience testing complex financial transactions, payment statuses or compliance-sensitive workflows.

Key Competencies

• Ownership and independence: Takes responsibility for QA planning, prioritisation and execution without constant guidance.
• Proactive mindset: Anticipates testing needs, identifies gaps early and engages stakeholders before development is completed.
• Structured analytical thinking: Approaches requirements, documentation and testing systematically.
• Technical understanding: Confidently works with API contracts, JSON structures and technical specifications.
• Effective communication: Clearly explains defects, requirements gaps, testing risks and their business impact.
• Product-oriented approach: Understands that quality assurance starts during product planning, not after development.

The Employer Offers

• fully remote role with location flexibility.
• Direct influence on web and mobile products used for international financial transactions.
• Close collaboration with an international product and engineering team.
• Ownership of QA planning, processes and quality standards, beyond repetitive test execution.
• Flexible working arrangements designed for effective remote collaboration.
• Opportunities to deepen your expertise in FinTech, payments, crypto and compliance-sensitive products.

Take ownership of quality from the earliest stages of product development. Help build reliable payment experiences used by customers worldwide.