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Muhammad Ahsan

@muhammadahsan19

Senior QA Engineer at Z2C Limited Technologies, tracing captured payments stuck in Pending to unprocessed webhooks.

At Z2C Limited Technologies (Begin.Watch), I traced captured payments stuck in Pending to unprocessed payment-confirmation webhooks and documented the root cause and remediation. I also verified billing records against delivered entitlements using PostgreSQL and Python.

I own test coverage for the subscription lifecycle, including renewals, trials, plan changes, cancellations and refunds. I use AI-assisted code reviews to understand service logic and shape test strategy, and I define release sign-off criteria and verify releases in production.

Earlier at Z2C Limited Technologies, I automated backend validation and integrated smoke and regression suites into Jenkins and Bitbucket Pipelines. At Stack Intel, I built Python and Playwright checks and automated Oracle data validation; at Titan Coders Ltd, I developed Python tools for data validation and reporting.

Experience

Work history, roles, and key accomplishments

Associate SQA Engineer

Walee Technologies

Validated API responses and data integrity with Postman and SQL/PostgreSQL. Wrote test plans and scenarios from BRD/FSD, and led defect triage with Engineering and Product.

Postman SQL PostgreSQL Test Planning Defect Triage Regression Testing Performance Testing

QA Specialist

Z2C Limited Technologies

Built risk-based test strategies for billing, entitlements, authentication, playback, and live events. Automated backend validation in Python and PostgreSQL, and integrated smoke and regression suites into CI/CD pipelines.

Python PostgreSQL REST API Testing Swagger OpenAPI JMESPath Jenkins Bitbucket Pipelines Locust JMeter Grafana Splunk ELK Cloudwatch

Senior SQA & Delivery Manager

Z2C Limited Technologies

Diagnosed a payment defect causing transactions stuck in Pending, traced to unprocessed webhooks, and delivered a full RCA. Reconcile billing system against entitlements using PostgreSQL and Python, and own test coverage for the subscription lifecycle.

Python PostgreSQL AI Assisted Code Review Jira Test Strategy Root Cause Analysis Release Management Webhook Verification Billing Systems Subscription Lifecycle

Automation Engineer

Stack Intel

Built automated backend and UI checks in Python and Playwright, including API tests and Locust load tests. Automated Oracle database validation and reconciliation with Python and LLM-assisted scripts.

Python Playwright API Testing Swagger OpenAPI JMESPath Locust Oracle LLM Lang Chain OpenAI API N8n Zapier

Python R&D Developer

Titan Coders Ltd

Built Python tooling for data validation, parsing, transformation, and reporting across large Oracle and PostgreSQL datasets. Automated data-quality routines and third-party API integrations using pandas, requests, and matplotlib.