Note: The job is a remote job and is open to candidates in USA. Publicis Sapient is seeking a Senior Java Engineer to join a large-scale financial services platform undergoing a Java modernization journey. The role involves migrating legacy systems to modern Java versions and cloud-native architectures, while ensuring high standards of reliability, security, and performance in backend systems.
Responsibilities
- Join a large-scale financial services platform, supporting business-critical systems with high standards of reliability, security, and performance
- Play a key role in the ongoing modernization of enterprise Java applications, including:
- Migrating legacy Java services to modern Java versions (Java 17 / Java 21)
- Refactoring existing codebases to improve scalability, performance, and maintainability
- Contributing to architectural evolution toward modern, cloud-native patterns
- Design and enhance high-performance backend systems, supporting both new features and platform evolution
- Collaborate directly with senior client stakeholders in a highly autonomous, client-facing environment
- Contribute to platform stability by participating in production-related activities, while keeping development and modernization as the primary focus
Skills
- Strong hands-on experience with Java in enterprise-scale systems, ideally within regulated or high-availability environments
- Proven experience working with modern Java versions, including Java 17 and Java 21
- Solid understanding of Core Java fundamentals, including Java Collections Framework (List, Set, Map, concurrency-aware collections)
- Object-oriented principles and enterprise design patterns
- Strong background in concurrency and multithreading, including ExecutorService, thread pools, synchronization strategies
- Designing thread-safe, high-performance systems
- Experience optimizing backend performance across REST APIs
- SQL queries and data access layers
- Microservices interactions and data processing flows
- Strong understanding of REST API concepts, including HTTP methods, status codes, idempotency
- API versioning, error handling, and performance considerations
- Hands-on experience implementing security best practices, including Authentication and authorization with Spring Security
- OAuth and JWT
- Proven experience in JVM analysis and tuning, including Memory management and garbage collection
- Thread dumps vs. heap dumps: when to use each and how to analyze them
- Performance troubleshooting using tools such as JConsole, JVisualVM, or similar
- Understanding and practical use of JMX
- Strong debugging skills, including Local debugging and remote debugging of Java applications
- Structured debugging methodologies for production and non-production environments
- Familiarity with basic Unix/Linux commands for troubleshooting and system inspection
- Solid understanding of build and dependency management, including Maven concepts (lifecycle, dependencies, plugins, profiles)
- Familiarity with NoSQL databases, with MongoDB preferred
- Understanding of event-driven architectures, including Kafka or similar messaging platforms
- Experience working in AWS-based environments (strong plus), with exposure to multi-cloud or hybrid cloud environments as a bonus
- Strong communication skills, able to explain technical decisions and findings clearly in discussions with senior stakeholders
- Experience modernizing enterprise Java platforms in financial or regulated industries
- Demonstrated JVM tuning and performance optimization work
- Background designing high-throughput, secure, event-driven backend systems
- Exposure to cloud-native, multi-cloud, or hybrid architectures
- Comfort leveraging AI tools to improve engineering productivity
- Experience working directly with senior stakeholders in client-facing roles
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