Senior Software Engineer - Core Java & Apache Spark

Citi; Chennai; On-site; INR 1,500,000 - 2,100,000; Full time

Job summary

Citi in Chennai is hiring a Senior Software Engineer to build and scale core data processing and application infrastructure. You will architect and deliver high-throughput pipelines using Java, Spark, and the Spring ecosystem, with a focus on concurrency and JVM internals.

Lead design reviews, mentor junior engineers, and drive adoption of cloud-native patterns, containerized deployments, and robust testing practices across distributed systems.

Qualifications

• Expert-level Java and JVM tuning, with a focus on concurrency and GC behavior.
• Hands-on Spark development, deployment, and performance optimization at scale.
• Production Spring ecosystem experience including Boot, Data, Batch, and Integration.
• Solid SQL and relational DB design, plus NoSQL exposure (MongoDB/Graph DB).
• Experience with container orchestration (Kubernetes/OpenShift) and CI/CD tooling.

Responsibilities

• Architect and build high-throughput, low-latency data pipelines using Spark and Spring.
• Optimize JVM performance and Spark job tuning for efficiency.
• Design scalable distributed systems with container orchestration and data stores.
• Uphold SOLID, DDD, and TDD practices; promote automated testing.
• Model data for relational and NoSQL databases, ensuring integrity and scalability.
• Own CI/CD pipelines for Java apps and Spark jobs in containers.
• Provide technical leadership, review designs, and mentor engineers.

Tools

Java (8+)

SQL

JVM

Spring Boot

Spring Data

Spring Batch

Spring Integration

Apache Spark

Hadoop

Hive

Impala

Spark SQL/DataFrames

PostgreSQL

Oracle

MongoDB

Graph DB

JMS

Solace

Docker

Kubernetes

OpenShift

Maven

Gradle

Jenkins

Git

SonarQube

JUnit

Mockito

Job description

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

Key Responsibilities:

• 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.

Required Technical Qualifications:

• 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.

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.

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.