Senior Software Engineer - Core Java & Apache Spark
We are hiring an elite Senior Software Engineer to build and scale our core data processing and application infrastructure. This role demands deep, hands-on expertise in the Java ecosystem and distributed computing with Apache Spark. You will be responsible for the architecture, design, and implementation of mission-critical systems that process massive datasets, requiring a mastery of concurrency, JVM internals, and modern cloud-native patterns.
Core Tech Stack:- Languages & Runtimes: Java (8+), SQL, JVM
- Frameworks & Libraries: Spring (Boot, Data, Security, Batch, Integration), Apache Spark (RDD, Spark SQL, DataFrames/DataSets)
- Big Data Ecosystem: Hadoop, Hive, Impala, Spark Tuning & Optimization
- Databases: Relational (e.g., PostgreSQL, Oracle), NoSQL (MongoDB, Graph DB)
- Messaging & Middleware: JMS, Solace
- Containerization & Orchestration: Docker, Kubernetes, OpenShift
- Build & CI/CD: Maven, Gradle, Jenkins, Git
- Code Quality & Security: SonarQube, TDD (JUnit/Mockito), Secure Coding Practices
- Architect & Build: Design and construct high-throughput, low-latency data processing pipelines using Apache Spark and the Spring ecosystem.
- Performance Engineering: Dive deep into JVM internals, garbage collection tuning, and Spark job optimization to maximize performance and resource efficiency.
- Distributed Systems Design: Implement scalable, resilient, and transactional architectures leveraging container orchestration (Kubernetes/OpenShift) and distributed data stores.
- Code & Design Excellence: Champion and enforce best practices in software engineering, including SOLID principles, advanced design patterns, Domain-Driven Design (DDD), and Test-Driven Development (TDD).
- Database Mastery: Engineer and optimize data models for both relational and NoSQL databases, ensuring data integrity, performance, and scalability.
- CI/CD Automation: Own and enhance CI/CD pipelines for automated build, test, and deployment of Java applications and Spark jobs in a containerized environment.
- Technical Leadership: Lead design and code reviews, mentor junior engineers, and drive the adoption of new technologies and architectural patterns across the team.
- Core Java & JVM: Expert-level proficiency in Java, including the Collections Framework, Lambdas, and the Java Concurrency API. Demonstrable experience tuning the JVM and troubleshooting memory/GC issues.
- Apache Spark: Proven, hands-on experience developing, deploying, and tuning complex Spark applications for large-scale data transformation and analysis.
- Spring Ecosystem: Extensive, practical experience with the Spring Framework, particularly Spring Boot, Spring Data, and Spring Batch in a production environment.
- Data Structures & Algorithms: Deep understanding of fundamental data structures and algorithms, with a focus on their application in distributed computing and performance-critical systems.
- Containerization & Cloud-Native: Hands-on experience with Docker for building images and Kubernetes/OpenShift for deploying and managing distributed applications.
- Database Engineering: Strong command of SQL and relational database design, including transaction management and indexing. Experience with at least one production NoSQL database (MongoDB, Graph DB, etc.).
- Architectural Design: Practical application of OOP, SOLID, and DDD principles to build maintainable and scalable systems. You write tests first (TDD) and believe in robust, automated testing.
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Job Family Group: Technology------------------------------------------------------
Job Family:Applications Development------------------------------------------------------
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.------------------------------------------------------
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Skills Required
- Expert proficiency in Java, including collections, lambdas, concurrency, JVM tuning, and memory or garbage-collection troubleshooting.
- Hands-on experience developing, deploying, and tuning complex Apache Spark applications for large-scale data processing.
- Extensive production experience with Spring Framework, particularly Spring Boot, Spring Data, and Spring Batch.
- Deep understanding of data structures and algorithms, especially for distributed and performance-critical systems.
- Hands-on experience with Docker and Kubernetes or OpenShift.
- Strong SQL and relational database design skills, including transactions and indexing.
- Production experience with at least one NoSQL database, such as MongoDB or a graph database.
- Practical application of object-oriented programming, SOLID, and domain-driven design principles.
- Experience with test-driven development and robust automated testing.
What We Do
Citigroup is a global diversified financial services holding company serving consumers, corporations, governments and institutions. It provides consumer banking and credit, corporate and investment banking, securities brokerage, trade and securities services, and wealth management. Operating across nearly 160 countries and jurisdictions, Citi aims to be a leading partner for institutions with cross-border needs, a global wealth manager, and a valued personal bank in the United States.
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