Piotr Krajewski

Design and develop end-to-end software solutions for humanitarian operations, working across the full stack with TypeScript, Node.js, and PostgreSQL. Implemented MTN Mobile Money payment integration for the 121 Platform, including API authentication, idempotent transfer references, and reconciliation logic.

Specialized in ensuring software reliability through comprehensive automated testing strategies using Playwright, Cypress, and k6. Developed integration tests, conducted load testing, and maintained test environments and automated user manuals.

Developed and implemented integration test solutions using Playwright, Cypress, and Node.js, integrating automated tests into CI/CD pipelines via Azure DevOps. Configured test environments and collaborated with junior team members to improve testing processes.

Tested a Maritime Vessel management system, creating UMLs, writing specifications, and developing automated Cypress tests with JavaScript.

Tested a Supplier Relationship Management system, defining test plans and cases on Azure DevOps, performing API tests with Postman and JavaScript, and reducing test cycle time.

Tested internal CMS products and multinational telecommunications projects, including SQL Postgres DB testing, UAT with international clients, API testing with Postman, and setting up Selenium UI testing framework.

Tested internal and external applications for insurance agents and customers, implementing automated tests with SOAP UI and Groovy scripts, performing regression testing, and testing Oracle SQL DB with SQL scripts.