Senior Backend Developer - Java or Python

About the role:

We are Optiveum, and we are currently looking for a Senior Backend Developer (Java or Python) to join our client's dynamic team. In this role, you will contribute to the ongoing development of the Automated Security Retest Engine, a cutting-edge security retesting platform that automates the analysis of security assessment reports and the verification of remediation actions.
The project involves developing and maintaining a Python-based processing pipeline as well as a Java Spring Boot web application that provides the user interface.
Your responsibilities:
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Designing and implementing new features for the platform.
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Integrating external tools and APIs.
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Improving the reliability and quality of generated tests and analysis.
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Writing automated tests, investigating defects, and maintaining technical documentation.
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Collaborating with security and product stakeholders to translate requirements into practical, maintainable software.
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Ensuring security as a core requirement: preserving target-scope restrictions, protecting credentials and user data, validating inputs, and providing reliable evidence for retest outcomes.
Must-have knowledge and experience:
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Professional software development experience in Python and/or Java.
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Experience in developing and maintaining backend applications and REST APIs.
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For Java: familiarity with Spring Boot and common application-development practices.
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For Python: familiarity with modular application design, dependency management, and automated testing.
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Proven experience writing and maintaining automated tests.
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Working knowledge of Git and collaborative software-development workflows (including code reviews).
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Understanding of secure software development (input validation, authentication, authorization, safe handling of secrets).
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Ability to analyze an existing codebase, troubleshoot issues, and deliver changes with appropriate documentation.
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Good written and spoken English for technical communication.
Nice-to-have knowledge and experience:
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Experience with both Python AND Java/Spring Boot.
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Experience integrating LLM APIs or building LLM-assisted workflows (including structured-output validation and error handling).
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Familiarity with application security testing, especially DAST and SAST.
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Experience with tools such as OWASP ZAP, Nuclei, Semgrep, pytest, or security-test automation.
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Experience with PDF processing, OCR, or document extraction.
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Familiarity with web technologies (JavaScript, HTML, CSS, Bootstrap, Thymeleaf).
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Experience with SQL databases, Maven, CI/CD, Docker, or cloud services.
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Interest in application security, vulnerability remediation, and security engineering.
What we offer:
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B2B agreement with Optiveum as your contracting party.
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Transparent working conditions.
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Ongoing support from the Optiveum team throughout our cooperation.
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The opportunity to work in an international, highly collaborative environment.