QA Engineer

Grand Circle Corporation•Boston, MA

14h•$90,000 - $100,000•Hybrid

About The Position

Grand Circle Corporation is seeking a detail-oriented QA Engineer to support its Core Services organization. This role focuses on hands-on API and backend testing, with an emphasis on validating services using Postman and ensuring the reliability of critical systems. The QA Engineer will design and execute API test plans, validate request and response data, and ensure quality, performance, and data integrity across backend services and integrations. This position involves close collaboration with Engineering, Platform, and Database teams to validate system-to-system interactions, assess downstream impacts, and support high-quality releases throughout the development lifecycle. This role is crucial for modernizing and strengthening systems that directly impact both internal teams and the traveler experience. The ideal candidate enjoys working with APIs and data, communicates effectively across technical teams, and brings a proactive quality mindset to complex platform environments. The company offers a dynamic work environment with opportunities to engage with systems related to travel in nearly 100 countries.

Requirements

2+ years of Quality Assurance experience with a focus on backend systems and API testing.
Strong hands-on experience using Postman for API validation and testing.
Solid understanding of RESTful APIs, GraphQL, HTTP methods, status codes, and JSON.
Experience writing SQL queries and validating backend data.
Proven ability to create test plans, test cases, and defect documentation.
Strong troubleshooting, analytical, and problem-solving skills.
Comfortable testing across multiple systems, platforms, and technical domains.
Familiarity with Jira, Confluence, or similar defect tracking and documentation tools.
Experience working in Agile environments such as Scrum or Kanban.
Strong communication skills with the ability to translate findings clearly and effectively.

Nice To Haves

Exposure to test automation concepts or API automation frameworks.
Understanding of CI/CD pipelines and service deployment workflows.
Experience supporting production issue analysis and root cause validation.
Comfortable collaborating across technical teams in fast-paced environments.

Responsibilities

Design, execute, and maintain API test plans and test cases supporting Core Services applications and integrations.
Validate RESTful and GraphQL APIs using Postman, including positive, negative, and edge-case scenarios.
Verify request and response payloads, authentication, headers, status codes, and error handling behavior.
Identify, document, and communicate defects, risks, inconsistencies, and quality concerns.
Support regression testing efforts for API updates and new service deployments.
Partner closely with Platform and Database teams to validate backend changes and integrations.
Perform data validation activities using SQL and database queries.
Validate system-to-system integrations and assess downstream impacts across connected services.
Support production issue investigations and validate fixes related to services and data integrity.
Create reusable test documentation, maintain traceability to requirements, and support test coverage initiatives.
Bridge frontend functionality and backend systems by validating API contracts, payloads, and database states to ensure end-to-end reliability.
Participate in Agile ceremonies and collaborate with Developers, Product Owners, and QA teammates.
Participate in design reviews to provide early quality and testability feedback.
Contribute to continuous improvements in QA processes, tooling, and best practices.