Jan Leszczyński

I'm building and maintaining email and SaaS security services at Check Point, with full ownership from coding and testing through deployment.

I work on analyzing users' messages and files for DLP, processing incoming spam-related messages, and supporting customer-required services. My stack includes Python, FastAPI, Flask, AWS, Docker, and OpenSearch.

Previously at Kyndryl, formerly IBM, I developed an internal cloud infrastructure application that processed requests to deploy, modify, and destroy VMs using Terraform or SDKs. I worked with API-and-worker architecture using Python, FastAPI, MongoDB, Celery, Redis, Docker, and Kubernetes, and contributed to a Node.js integration application.

My earlier work at mBank and Transition Technologies Advanced Solutions included monitoring-alert processing, data enrichment, bug fixing, unit testing, and system integrations. I've worked with Django, Flask, PostgreSQL, MariaDB, RabbitMQ, Jenkins, and Redis.