Sr. QA Engineer (Manual) - Contractual

About us:

Working at Tech Holding isn’t just a job, it’s an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients.  Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.

About the Role

We are looking for a Senior QA Engineer  - Contract to support critical product validation initiatives with a strong focus on API and end-to-end workflow testing. This role emphasizes manual testing, exploratory validation, and ensuring high-quality releases across complex system interactions.

You will collaborate closely with engineering and product teams to ensure reliability, accuracy, and seamless user experiences across the application lifecycle.

Key Responsibilities

API & Workflow Testing

• Validate end-to-end workflows across system components and services.
• Perform API testing using tools like Postman or similar REST clients.
• Verify request/response structures, data integrity, and service behavior.
• Test different functional scenarios across APIs, including positive and negative cases.

Functional & Edge Case Validation

• Execute detailed functional, regression, and exploratory testing.
• Identify edge cases, failure scenarios, and unexpected system behaviors.
• Validate error handling, fallback mechanisms, and system resilience.
• Ensure consistency across different environments and configurations.

Data Validation & Backend Testing

• Validate data consistency across APIs and databases.
• Perform backend validation using SQL queries.
• Verify logs, records, and system outputs for correctness.

System Reliability & Scenario Testing

• Test system behavior under different conditions (e.g., retries, timeouts, partial failures).
• Validate data flow across multiple services and components.
• Ensure system stability during complex workflows.

Release Validation & Production Support

• Support pre-release validation and smoke testing.
• Participate in production verification and post-release checks.
• Collaborate with teams for defect triaging and resolution.

Requirements

• 5+ years of QA experience with strong focus on manual and API testing.
• Hands-on experience with API testing tools (Postman or similar).
• Strong understanding of REST APIs, HTTP protocols, and JSON.
• Experience with SQL and backend data validation.
• Strong expertise in functional, regression, and exploratory testing.
• Familiarity with distributed systems behavior (timeouts, retries, failures).
• Strong analytical thinking and debugging skills.
• Ability to work independently in a fast-paced, remote environment.

Good to Have

• Experience working in Agile/Scrum environments.
• Basic understanding of system integrations and service-based architecture.
• Exposure to log analysis and monitoring tools.

Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color,…