IT Developer - Senior (42961)

Salary: 1000-1300 PLN/day on B2B

Work model: hybrid from Gdynia / Gdańsk / Warszawa (3 days per week from the office)

Why choose this offer?

• You can expect a flexible work organization
• The international work environment will give you the opportunity to interact with the English language on a daily basis
• Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit)
• The Jit community will bring you a nice time during regular integration meetings

Project

Responsibilities you'll have

• Design, develop, and maintain features within the Automated Security Retest Engine
• Develop and enhance Python-based processing pipelines
• Build and maintain backend services and REST APIs
• Contribute to the Java Spring Boot web application
• Integrate external tools, APIs, and AI/LLM-based services
• Improve reliability, accuracy, and quality of generated security tests and analysis
• Write automated unit and integration tests
• Investigate, troubleshoot, and resolve software defects
• Maintain technical documentation and development standards
• Collaborate with security experts and product stakeholders to transform requirements into practical solutions
• Ensure the platform adheres to application security requirements and best practices
• Protect sensitive data, credentials, and security-related information

Must have competences and knowledge

• Min. 5 years of professional experience in Python and/or Java development
• Experience developing and maintaining backend applications
• Experience creating and consuming REST APIs
• For Java development: hands-on experience with Spring Boot
• For Python development: experience building modular applications and maintainable codebases
• Understanding of software engineering best practices
• Experience with automated testing
• Strong analytical and problem-solving skills
• Good communication skills and English proficiency

Nice-to-have competences and knowledge

• Experience working with both Python and Java
• Experience integrating LLM APIs or building AI-assisted workflows
• Knowledge of structured-output validation and error-handling mechanisms
• Experience with application security testing
• Knowledge of DAST and SAST methodologies
• Experience with tools such as OWASP ZAP, Nuclei, Semgrep, pytest
• Experience in security test automation
• Experience with PDF processing, OCR, or document extraction solutions
• Familiarity with JavaScript, HTML, CSS, Bootstrap, and Thymeleaf
• Experience with SQL databases
• Experience with Maven, CI/CD pipelines, Docker, or cloud services
• Interest in cybersecurity, vulnerability management, and security engineering

Technologies you'll work with

• Python and/or Java & Spring Boot
• REST APIs
• Git, Maven, CI/CD
• Pytest and automated testing frameworks
• SQL databases and Docker
• LLM APIs and AI-assisted workflows
• Security tools such as OWASP ZAP, Nuclei, and Semgrep
• OCR, document processing, and PDF analysis technologies

Client – why choose this particular client from the Jit portfolio?

Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture, which is conducive to people who place emphasis on work-life balance and feedback culture. Furthermore, all projects are executed in international teams, giving constant exposure to the English language.

About Jit Team

The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.