Sr. QA Engineer - Machine Learning Platform E-Commerce

AppIQ Tech is seeking a meticulous and strategic QA Engineer / Sr. QA Engineer to ensure the quality and reliability of our Machine‑Learning‑driven e-commerce funnel optimisation and digital advertising platform. You will be responsible for defining the testing strategy for high‑performance applications that leverage our proprietary Predictive AI solutions. As a key member of our fast‑paced startup, you will balance the need for rapid feature deployment with the necessity of thorough testing.

You will be responsible for identifying and prioritising the highest‑risk bugs to ensure our scalable services, which manage millions of daily events, remain robust and accurate.

• QA Architecture & Strategy:
  Develop and maintain a comprehensive QA architecture that supports full‑stack applications and complex microservices.
• Risk Management:
  
  Prioritise bug fixes based on risk of failure and potential impact, while striking a productive balance between speed‑to‑market and exhaustive testing.
• Test Management:
  Utilise test case management (TCM) systems such as Test Rail, Zephyr, Xray, Practi Test, qTest, or similar to organise test cases, track execution, and provide transparent reporting on quality metrics.
• Automated Testing:
  Design, implement, and scale automated test suites using tools such as Playwright, Cypress, and Appium.
• Testing & Validation:
  Perform rigorous unit tests and integration tests on applications built with Type Script, React, Node.js, Python, and PySpark.
• Infrastructure Testing:
  Verify the reliability of deployments across AWS (EC2, S3, Firehose) and Cloudflare edge environments.
• Data Integrity:
  Collaborate with Data Engineers to validate the accuracy of complex event data and real‑time reporting dashboards.
• Cross‑Functional
  
  Collaboration:
  
  Act as a great team player with excellent communication skills, working closely with developers and data scientists to ensure a seamless end‑user experience.

• 4+ years of professional experience in software quality assurance or engineering, with a strong focus on scalable web applications (7+ years for Sr. QA Engineer).
• Strong grasp of QA architecture and modern testing methodologies.
• Deep expertise in the tech stack used by our engineers, specifically Type Script, React, Node.js, Python, and PySpark.
• Cloud & Database Proficiency:
  Familiarity with AWS services and both SQL and No
  
  SQL (e.g., Mongo
  
  DB) databases to effectively test data persistence and performance.
• Global
  
  Collaboration:
  
  Ability to work effectively with globally distributed teams.
• Native or Business‑level proficiency in written and spoken English.

• AI/ML Literacy:
  Understanding of Machine Learning (Supervised/Reinforcement Learning), Predictive AI, and the validation of Data Pipelines.
• Proficiency in Python or experience with PySpark.
• Prior experience in the e‑commerce or Ad Tech ecosystem (DSPs, Audience Data, Fraud detection).

• The opportunity to shape the QA culture and architecture from the ground up.
• An attractive career path on either a management or an individual contributor track.
• Genuine learning, training and development opportunities, supported by regular performance reviews.
• Competitive compensation and generous paid time off.
• Work‑from‑anywhere flexibility.
• Opportunities to develop expertise in building cutting‑edge predictive AI applications.