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REQUIREMENT_ID_315 β€’ 3-DAY_ACTIVE_POLICY

Java Backend Developer

Company
Company Citigroup
Type
Opportunity Type Internship
Salary
Stipend / Salary β‚Ή8-12 LPA
Location
Location Chennai, Tamil Nadu, India
Posted Date
Posted Date Today
Core Java OOP Collections Exception Handling Multithreading SQL Git JUnit Mockito Spring Boot REST APIs Maven/Gradle
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Aptitude Practice Questions Open Resource β†—
Helps you prepare for the online reasoning and quantitative test commonly used in Citi's first round.
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Technical Interview Preparation Guide Open Resource β†—
Covers core Java, data structures, and system design topics frequently asked in Citi technical interviews.
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Citi Specific Interview Insights Open Resource β†—
Provides recent candidate experiences, sample questions, and tips tailored for Citi's hiring process.
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Coding Practice Platform Open Resource β†—
Offers a wide range of algorithmic problems to sharpen coding skills required for Citi's technical rounds.

Bachelor’s degree in Computer Science, Information Technology, Software Engineering or related field; minimum 60% aggregate (or CGPA 6.0/10); graduating batch 2025 or 2026; no active backlogs; strong fundamentals in Java and SQL; willingness to learn new technologies.

1
Round 1: Online Aptitude Test (Logical Reasoning, Numerical Ability, Verbal)
2
Round 2: Technical Interview (Java, Data Structures, SQL, Spring basics)
3
Round 3: HR Interview (fitment, communication, career goals)
Citi is a global financial services powerhouse with a presence in over 160 countries and a workforce of more than 219,000 professionals. In India, Citi operates across banking, markets, and technology, offering innovative solutions to corporate and retail clients. The company is known for its strong emphasis on digital transformation, investing heavily in cloud, AI, and modern software platforms to stay ahead in the competitive financial landscape. As a fresher-friendly employer, Citi provides structured learning programs, mentorship from senior engineers, and a clear career progression path that can take a junior developer to senior architect roles within a few years. The Java Backend Developer role is designed for recent graduates who have a solid foundation in core Java and are eager to dive into enterprise‑grade backend development. Working under the guidance of senior engineers, you will contribute to building and maintaining high‑performance APIs that power Citi’s internal and external applications. The position offers a hybrid work model, allowing you to collaborate in the Chennai office while also enjoying the flexibility of remote work days. Key Responsibilities: 1. Write clean, modular Java code to develop new backend features and RESTful API endpoints. 2. Debug and resolve production and non‑production issues, ensuring minimal downtime. 3. Refactor legacy code to improve readability, performance, and adherence to coding standards. 4. Develop unit and integration tests using JUnit and Mockito to achieve high test coverage. 5. Participate in code reviews, providing and receiving constructive feedback. 6. Write basic SQL queries, perform schema updates, and work with ORM tools like Hibernate. 7. Use Git for version control, manage branches, and create pull requests. 8. Collaborate with cross‑functional agile teams, attending daily stand‑ups, sprint planning, and retrospectives. 9. Continuously learn design patterns, system architecture, and emerging backend technologies. 10. Assist in CI/CD pipeline monitoring and understand deployment workflows. Tech Stack: Java 11+, Spring Boot, Spring MVC, Spring Data, Hibernate, PostgreSQL/MySQL, Git, Maven/Gradle, JUnit, Mockito, Docker (basic), AWS (basic). Growth Path: Starting as a Junior Java Developer, you can progress to Software Engineer, Senior Engineer, Lead Engineer, and eventually Architecture or Management roles, with regular performance reviews and access to Citi’s internal learning platforms. Why Join Citi? You will be part of a globally recognized brand that values diversity, continuous learning, and innovation. The role offers mentorship, exposure to cutting‑edge financial technology, and a supportive environment that encourages you to build a strong foundation for a long‑term career in software engineering.

Citigroup β€” Data Analytics & SQL Interview Guide

Previously asked questions, exam syllabus, coding benchmarks & round strategy.

APTITUDE & LOGIC πŸ“–
Aptitude Practice Questions & Online Mock Tests

Curated logical, quantitative, and verbal reasoning problems to sharpen reasoning skills required for the initial screening test.

Open Resource β†—
COMPANY GUIDE 🎯
Citigroup Interview Preparation Corner

Comprehensive guide covering typical interview formats, common questions, and preparation tips for Citigroup and off-campus tech roles.

Open Resource β†—
MOCK TESTS & PAPERS πŸ“
Comprehensive Interview Prep Resources & Syllabus

Collection of previous year questions, company-specific test patterns, and interview experiences for technical and HR rounds.

Open Resource β†—
CODING PRACTICE πŸ’»
Algorithm and Data Structure Problem Set

Practice problems to improve coding proficiency and algorithm problem-solving speed for technical rounds.

Open Resource β†—
Round 1: Online Assessment (OA)
Aptitude, Quantitative Logic & 2 Coding Problems
Focus on accuracy and speed. Practice arrays, strings, and standard arithmetic puzzles.
Round 2: Technical Interview 1
Core Tech Stack (Core Java, OOP, Collections, Exception Handling, Multithreading, SQL, Git, JUnit, Mockito, Spring Boot, REST APIs, Maven/Gradle) & Live Code Tracing
Explain your thought process aloud. Analyze time & space complexities before coding.
Round 3: System Design & Problem Solving
Database Schemas, APIs & Architecture Basics
Clarify edge cases, diagram schemas cleanly, and discuss scalability trade-offs.
Round 4: HR & Cultural Fit Discussion
Citigroup Core Values, Learning Agility & Offer Terms
Demonstrate passion, strong communication, and readiness for full-time collaboration.
What is the difference between WHERE and HAVING clauses in SQL? Answer β–Ό
Model Answer: WHERE filters rows before any groupings are applied, while HAVING filters aggregated groups after GROUP BY has executed.
Explain SQL Window functions: ROW_NUMBER(), RANK(), and DENSE_RANK(). Answer β–Ό
Model Answer: ROW_NUMBER() assigns unique sequential integers. RANK() assigns identical ranks to ties and skips ranks. DENSE_RANK() assigns identical ranks to ties without skipping rank numbers.
How do you handle NULL and missing values during data cleaning in Python/Pandas? Answer β–Ό
Model Answer: Use .isna().sum() to identify missing values. Impute with mean/median using .fillna() or remove with .dropna(subset=[...]) depending on variance impact.
What is the difference between Star Schema and Snowflake Schema in Data Warehousing? Answer β–Ό
Model Answer: Star Schema has denormalized dimension tables directly connected to the central Fact table. Snowflake Schema normalizes dimension tables into sub-dimensions to minimize redundancy.
How do you calculate MoM (Month-over-Month) growth in SQL? Answer β–Ό
Model Answer: Use LAG(revenue, 1) OVER (ORDER BY month) to fetch the previous month's revenue and compute (revenue - prev_revenue) / prev_revenue * 100.
Why do you want to join Citigroup as a Java Backend Developer?
Preparation Tip: Highlight Citigroup's market reputation, recent tech innovations, and how your skills in Core Java directly solve their team's objectives.
Describe a challenging bug or academic project roadblock and how you resolved it.
Preparation Tip: Use the STAR method: Situation (project context), Task (what needed solving), Action (specific tools/logic applied), Result (quantifiable positive outcome).
How do you handle strict deadlines or sudden scope changes?
Preparation Tip: Explain your prioritization strategy, proactive communication with mentors/peers, and agile mindset.

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