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Backend Engineer– Java

QuinStreet

  • Pune, India
  • Competitive Package
  • 3–6 Years
  • Posted Today
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About the role

Corporate Overview

Powering Performance Marketplaces in Digital Media

QuinStreet is a pioneer in powering decentralized online marketplaces that match searchers and “research and compare” consumers with brands. We run these virtual- and private-label marketplaces in one of the nation’s largest media networks.

Our industry leading segmentation and AI-driven matching technologies help consumers find better solutions and brands faster. They allow brands to target and reach in-market customer prospects with pinpoint segment-by-segment accuracy, and to pay only for performance results.

Our campaign-results-driven matching decision engines and optimization algorithms are built from over 20 years and billions of dollars of online media experience.

We believe in

  • The direct measurability of digital media.
  • Performance marketing. (We pioneered it.)
  • The advantages of technology.

We bring all this together to deliver truly great results for consumers and brands in the world’s biggest channel.

Software Engineer – Java (Quest v2 Platform Modernization)

Location: Pune, India (Hybrid)

Experience: 3–6 Years

About the Role

We are looking for a Java Software Engineer to support the modernization of Quest, a high-volume event and workflow-processing platform that handles millions of events daily. You will work with senior engineers to develop, test, deploy, and support scalable backend services as part of the Quest v2 migration initiative.

Key Responsibilities

  • Develop and maintain Java/Spring Boot applications, REST APIs, and backend services.
  • Build event-driven solutions using Kafka and asynchronous processing patterns.
  • Develop and optimize database interactions using MySQL and SQL.
  • Write clean, maintainable, and testable code following engineering standards.
  • Create unit and integration tests and participate in code reviews.
  • Troubleshoot production issues, monitor application performance, and support deployments.
  • Contribute to platform modernization, reusable components, and technical documentation.

Required Skills

  • 3–6 years of software development experience with Java.
  • Strong experience with Spring Boot, REST APIs, and backend service development.
  • Solid understanding of OOP, design patterns, multithreading, and concurrency.
  • Experience with SQL and relational databases (MySQL, Oracle, etc.).
  • Familiarity with JUnit, Mockito, Git, Maven/Gradle, and Linux environments.
  • Strong debugging, analytical, and problem-solving skills.

Preferred Skills

  • Experience with Kafka, event-driven architectures, and asynchronous processing.
  • Exposure to Redis, microservices, Docker, and Kubernetes.
  • Experience modernizing legacy Java applications.
  • Knowledge of application monitoring, logging, tracing, and performance tuning.
  • Experience working on high-volume transaction or workflow-processing systems.

What We're Looking For

  • Hands-on engineer who takes ownership of features from development through production support.
  • Strong collaborator who follows established architecture patterns and coding standards.
  • Curious, accountable, and eager to learn in a complex, high-scale environment.

Note: This is an individual contributor role focused on software development and component ownership. It does not include architecture ownership, people management, or infrastructure administration.

QuinStreet is an equal opportunity employer. We do not discriminate on the basis of race, color, religion, national origin, pregnancy status, sex, age, marital status, disability, sexual orientation, gender identity or any other characteristics protected by law.

Please see QuinStreet’s Employee Privacy Notice here and EU/UK Candidate Privacy Notice here.

Eligibility & process

Who can apply

Seniority: Mid-Senior level. Employment type: Full-time

Skills & stack

Java SQL Spring Boot REST APIs Microservices MySQL Redis Oracle DB

Selection process

Details are shared by the recruiter after shortlisting.

Prep kit

20 resources
Study material 4
Company-specific guides 4
Likely coding questions 4
Round-wise strategy 4
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 (Java, SQL, Spring Boot, REST APIs, Microservices, MySQL, Redis, Oracle DB) & 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 QuinStreet Core Values, Learning Agility & Offer Terms Demonstrate passion, strong communication, and readiness for full-time collaboration.
Technical questions 5
What is the difference between WHERE and HAVING clauses in SQL? Answer
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
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
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
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
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.
Behavioural & HR questions 3
Why do you want to join QuinStreet as a Backend Engineer– Java?
Highlight QuinStreet's market reputation, recent tech innovations, and how your skills in Java directly solve their team's objectives.
Describe a challenging bug or academic project roadblock and how you resolved it.
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?
Explain your prioritization strategy, proactive communication with mentors/peers, and agile mindset.
QuinStreet Competitive Package
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