Senior Fullstack Engineer (Python) - Cybersecurity @ Strefa IT Kandydata

B2B contract until the end of 2025, with an option to extend for 2026.

Work Mode : Hybrid (6 times / month onsite in Kraków – preferred – or Warsaw).

A leading global financial technology team is looking for a Cybersecurity Full Stack Engineer to support the development of secure, scalable tools that strengthen and automate vulnerability detection, assessment, and remediation processes across a large enterprise environment.

Required Qualifications :

• Strong experience in backend development with Python and frameworks like FastAPI, Flask, or Django.
• Good understanding of microservice architecture and related patterns (e.g., CQRS, event sourcing).
• Experience with containerization (Docker, Kubernetes) and CI / CD tools (Jenkins, GitLab).
• Solid skills in Linux system administration and core networking (TCP / IP, DNS, Firewalls).
• Proficiency with Git and working knowledge of branching strategies.
• Working knowledge of frontend technologies (HTML, CSS, JavaScript).
• Strong SQL skills and the ability to write complex queries.
• Test-driven development mindset and hands-on experience writing unit, integration, and functional tests.
• Familiarity with agile delivery, DevSecOps practices, and tools like Jira and Confluence.
• Excellent verbal and written communication skills in English.

Preferred Skills :

B2B contract until the end of 2025, with an option to extend for 2026.

Work Mode : Hybrid (6 times / month onsite in Kraków – preferred – or Warsaw).

Design, develop, and maintain Python-based microservices and REST APIs (preferably using FastAPI)., Build data pipelines and ETL jobs using Python libraries (e.g., Pandas) and orchestration tools like Airflow., Integrate and automate third-party security tools for continuous vulnerability scanning and reporting., Contribute to CI / CD pipelines and deploy applications using Docker and Kubernetes., Troubleshoot and support existing services (L2 / L3), fix bugs, and write automated tests., Participate in code reviews and help improve engineering practices across the team.] Requirements : Python, JavaScript, FastAPI, Django, CQRS, CI / CD, Jenkins, GitLab, TCP / IP, DNS, HTML, CSS, SQL, SAST, DAST, PostgreSQL, MongoDB, Kafka, RabbitMQ, Docker, Kubernetes, Jira, Confluence, React, AWS, GCP, Azure, Terraform, Prometheus, Service mesh, pandas, Airflow Additionally : Sport subscription, Private healthcare.