Java Developer – Identity & Security

Stack

Responsibilities

• ▹Design, develop, and operate security-critical backend services using Java and Spring Boot
• ▹Build and maintain authentication and authorization services based on OAuth 2.0, OpenID Connect, and modern identity standards
• ▹Apply secure software engineering principles throughout the development lifecycle
• ▹Identify, assess, and mitigate security risks during system design and implementation
• ▹Develop secure APIs, token services, and identity-related microservices
• ▹Implement secure communication mechanisms including mTLS and certificate-based authentication
• ▹Contribute to cryptographic solutions including key management, encryption, digital signatures, and secure credential handling
• ▹Perform security-focused code reviews and proactively detect vulnerabilities
• ▹Collaborate with architects, security engineers, DevOps teams, and QA specialists to ensure secure and compliant solutions
• ▹Support threat modeling, security assessments, penetration testing remediation, and audit activities

Requirements

• ▹5+ years of proven software development experience
• ▹Strong expertise in Java and the Spring Boot ecosystem
• ▹Extensive experience designing and developing enterprise-grade backend applications
• ▹Deep understanding of distributed systems, REST APIs, microservices, and event-driven architectures
• ▹Strong database experience, preferably PostgreSQL
• ▹Strong security-first mindset and understanding of application security principles (OWASP Top 10, secure coding, authentication/authorization, threat modeling, secrets management, data protection, security testing)
• ▹Hands-on experience with Spring Security, OAuth 2.0, OpenID Connect, JWT, and mTLS
• ▹Good understanding of cryptography fundamentals, certificate management, PKI, and key lifecycle management
• ▹Experience with Git, CI/CD pipelines, automated testing, and DevSecOps practices
• ▹Strong understanding of cloud-native application development

Soft skills

What we offer

• ▹Remote work option (within Hungary only, due to taxation regulations)

About the company

Deutsche Telekom IT Solutions (DT-ITS) is a subsidiary of the Deutsche Telekom Group, with more than 5,300 employees, providing IT and telecommunications services to large customers in Germany and other European countries; it has four sites in Hungary: Budapest, Debrecen, Pécs, and Szeged. In 2025 it ranked among Hungary's most attractive employers (Randstad survey).