Senior IT Developer

b2bnetwork; Warszawa; On-site; PLN 140,000 - 210,000; Full time

Job summary

b2bnetwork in Warsaw, Poland is seeking a software developer to contribute to the Automated Security Retest Engine, a platform that automates analysis of security assessment reports and remediation verification.

You will build and maintain Python and Java backend applications, REST APIs, and a Spring Boot web UI, design features, integrate external tools and APIs, write automated tests, troubleshoot defects, and document work for repeatable retests with strong security practices.

Qualifications

• Proficient in Python or Java and modern backend development practices.
• Experience with RESTful API design and backend services.
• Familiarity with Spring Boot and standard dev practices.
• Experience writing automated tests and using Git workflows.
• Understanding of secure software development, including input validation and auth.
• Ability to read and communicate in technical English.

Responsibilities

• Develop and maintain Python and/or Java backend services.
• Work on a Java Spring Boot web UI and REST APIs integration.
• Design and implement new features, improve reliability and testability.
• Collaborate with security and product teams to translate requirements into code.
• Write automated tests and maintain documentation for retests.
• Investigate defects and provide secure, well-documented changes.

Skills

Python

Java

Backend development

REST APIs

Spring Boot

Automated testing

Git

Security best practices

English communication

Job description

Detailed description of work task to be carried out

The developer will contribute to the ongoing development of the Automated Security Retest Engine, a security retesting platform that automates the analysis of security assessment reports and the verification of remediation actions.
The work includes developing and maintaining a Python-based processing pipeline and the Java Spring Boot web application, which provides a user interface.
Responsibilities will include designing and implementing features, integrating external tools and APIs, improving the reliability and quality of generated tests and analysis, writing automated tests, investigating defects, and maintaining technical documentation. The developer will work with security and product stakeholders to translate requirements into practical, maintainable software.
Security is a core requirement: changes must preserve configured target-scope restrictions, protect credentials and user data, validate inputs, and provide reliable evidence for retest outcomes.

Must-have knowledge and experience

Professional software development experience in Python and/or Java.
Experience developing and maintaining backend applications and REST APIs.
For Java development: familiarity with Spring Boot and common application-development practices.
For Python development: familiarity with modular application design, dependency management, and automated testing.
Experience writing and maintaining automated tests.
Working knowledge of Git and collaborative software-development workflows, including code reviews.
Understanding of secure software development, including input validation, authentication and authorization, and safe handling of secrets.
Ability to analyze an existing codebase, troubleshoot issues, and deliver changes with appropriate documentation.
Good written and spoken English for technical communication.