Platform Security Engineer

Role Overview: The C11 Platform Security Engineer contributes to the end-to-end design, development, and enhancement of high-throughput Java microservices and reverse-proxy components within the Security Gatewayecosystem. Working closely with C12 Lead Engineers and cross-functional teams, the role focuses on building secure, scalable, and resilient security filtering and API routing components. Key Responsibilities: 1. Security Gateway & Java Microservice Development - Java Application Engineering: Develop, test, and maintain high-performance, resilient microservices using Java (Java 11/17+), Spring Boot, Spring Security, and RESTful APIs . - Security Gateway Implementations: Support reverse-proxy and gateway integrations (e.g., PingAccess, OpenShift/ECS container services) to secure Green Network (GRN) enterprise application traffic. - Authentication & Federation Support: Assist in implementing modern authentication protocols (SecureSSO, OIDC, OAuth 2.0, COIN tokens) and participate in migrating legacy security protocols (e.g., SiteMinder to OIDC/COIN). - API Routing & Fault Tolerance: Configure and maintain routing downstream from API Gateways (Apigee / APIM), integrating service discovery (Eureka/CCP) and implementing resilience patterns (resilience4j/circuit breakers, retries, and rate limiters). 2. Software Lifecycle, Quality & Code Execution - Full Development Lifecycle: Participate actively in all phases of the Agile SDLC (sprint planning, daily standups, backlog refinement, and retrospectives). - Code Quality & Testing: Write clean, modular, and maintainable Java code adhering to SOLID principles; build comprehensive unit, integration, and contract tests utilizing JUnit, Mockito, and test containers . - Root Cause Analysis & Defect Remediation: Investigate, debug, and resolve application bugs, performance bottlenecks, and runtime errors in non-production and production environments. - CI/CD & DevOps Integration: Build and manage automated build/deploy pipelines using Git, Maven/Gradle, and enterprise CI/CD tools (e.g., Tekton/Lightspeed, Bitbucket/GitHub, OpenShift). 3. Security, Risk & Collaboration - Secure Coding & Vulnerability Remediation: Ensure all developed code complies with enterprise security benchmarks (SonarQube, Snyk, Checkmarx, MCD scans) and remediate identified vulnerabilities promptly. - Peer Reviews & Collaboration: Actively participate in peer code reviews, contribute to technical documentation, and collaborate effectively with quality assurance, architecture, and platform operations teams. - Risk & Controls Adherence: Adhere to Citi’s technology risk and governance policies, applying sound judgment to safeguard firm assets and data. 4. Recommended Qualifications & Education (C11 Level) Recommended Qualifications: - 5–8 years of hands-on software development experience with enterprise Java applications. - Strong proficiency in Java (Java 11/17+), Spring Boot, Spring Security, and microservices architecture . - Solid understanding of REST APIs, HTTP/HTTPS protocols, mutual TLS (mTLS), and web security standards (OWASP Top 10). - Working knowledge of authentication/authorization protocols such as OAuth2, OpenID Connect (OIDC), JWT, and SAML . - Practical experience working with containerized environments ( Docker, Kubernetes / Red Hat OpenShift ). - Experience with relational/NoSQL databases, SQL querying, and database connection pooling. - Hands-on experience with automated testing tools ( JUnit, Mockito ) and CI/CD tools ( Git, Maven/Gradle, Jenkins/Tekton ). - Good problem-solving, analytical, and debugging skills with distributed systems. - Strong verbal and written communication skills with the ability to articulate technical issues clearly in an Agile team setup. Education: - Bachelor’s/University degree in Computer Science, Information Technology, Engineering, or equivalent practical experience. ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Digital Software Engineering ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Most Relevant Skills Please see the requirements listed above. ------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. ------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi . View Citi’s EEO Policy Statement and the Know Your Rights poster.