N #2163
Applications open
Full-Time Job
Java Developer
Wissen Technology
About the role
Key Responsibilities Design, develop, and maintain robust backend applications using the Java technology stack. Develop applications using Java, Spring Boot, Spring Data JPA, Hibernate, and Spring Batch. Design and develop RESTful APIs and integrate backend services with other applications. Work with Microservices architecture to build scalable and reliable services. Design, develop, and optimize database queries using SQL and NoSQL databases. Follow CI/CD practices to improve development, deployment, and release processes. Proactively identify, troubleshoot, and resolve technical and integration issues across the application stack. Write and maintain unit and integration tests for existing and newly developed code. Participate in code reviews and follow software engineering best practices. Collaborate with cross-functional teams to understand requirements and deliver effective technical solutions. Troubleshoot production issues and contribute to application performance and stability. Required Skills 5+ years of experience in Backend Java Development. Strong proficiency in Core Java. Hands-on experience with Spring Boot. Experience with Spring Framework, Spring Data JPA, and Hibernate. Experience with Spring Batch. Strong understanding of RESTful APIs. Good knowledge of Microservices architecture. Strong experience with SQL databases. Exposure to NoSQL databases. Experience with Git and CI/CD. Experience with JUnit, Mockito, or similar testing frameworks. Strong debugging and troubleshooting skills. Good understanding of software development best practices.
Eligibility & process
Who can apply
Experience: 6-10 Yrs. Open to matching qualifications.
Skills & stack
Selection process
- Online Assessment / Technical Interview Rounds / HR Review
Prep kit
20 resourcesStudy material 4
Aptitude Practice Questions & Mock Tests
Curated logical, quantitative, and verbal reasoning problems for the initial online screening round.
Company-Specific Interview Preparation Corner
Detailed interview experiences, exam formats, and previous test questions for Wissen Technology and tech roles.
Technical Placement Cheat Sheets & Question Bank
High-yield coding cheat sheets, core CS fundamentals (OOP, DBMS, OS, Networks), and rapid revision guides.
Algorithm, DSA & Live Code Debugger Practice
Hands-on problem sets to improve coding speed and step-by-step memory debugging.
Company-specific guides 4
APTITUDE & LOGIC
Aptitude Practice Questions & Online Mock Tests
Curated logical, quantitative, and verbal reasoning problems to sharpen reasoning skills required for the initial screening test.
COMPANY GUIDE
Wissen Technology Interview Preparation Corner
Comprehensive guide covering typical interview formats, common questions, and preparation tips for Wissen Technology and off-campus tech roles.
MOCK TESTS & PAPERS
Comprehensive Interview Prep Resources & Syllabus
Collection of previous year questions, company-specific test patterns, and interview experiences for technical and HR rounds.
CODING PRACTICE
Algorithm and Data Structure Problem Set
Practice problems to improve coding proficiency and algorithm problem-solving speed for technical rounds.
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 (Multithreading, Boot, Algorithms, Java Development, Spring Boot, Microservices, Data Structures & Algorithms, Java) & 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
Wissen Technology Core Values, Learning Agility & Offer Terms
Demonstrate passion, strong communication, and readiness for full-time collaboration.
Technical questions 5
Explain OOP (Object-Oriented Programming) principles with real-world examples in Multithreading. Answer
Model answer: 1. Encapsulation (data hiding via private fields/getters). 2. Abstraction (hiding implementation complexity). 3. Inheritance (code reusability). 4. Polymorphism (method overriding/overloading).
What is the time and space complexity of QuickSort vs MergeSort? Answer
Model answer: QuickSort: Average O(N log N) time, O(log N) space. Worst O(N^2). MergeSort: Guaranteed O(N log N) time, but requires O(N) auxiliary space.
Explain the difference between SQL Indexing (B-Tree vs Hash) and when not to use an index. Answer
Model answer: Indexes speed up SELECT queries via B-Trees. However, they slow down INSERT, UPDATE, and DELETE operations because indexes must be updated on disk. Avoid on low-cardinality columns (e.g., boolean flags).
What happens under the hood when you enter a URL in a browser? Answer
Model answer: 1. DNS lookup (resolves IP). 2. TCP 3-way handshake (SYN, SYN-ACK, ACK). 3. TLS negotiation for HTTPS. 4. HTTP GET request sent. 5. Server responds with HTML/CSS/JS. 6. Browser renders DOM & CSSOM tree.
What is the difference between REST and GraphQL APIs? Answer
Model answer: REST uses multiple fixed endpoints with possible over/under-fetching. GraphQL uses a single endpoint allowing clients to query exact fields in a single request.
Behavioural & HR questions 3
Why do you want to join Wissen Technology as a Java Developer?
Highlight Wissen Technology's market reputation, recent tech innovations, and how your skills in Multithreading directly solve their team's objectives.
Highlight Wissen Technology's market reputation, recent tech innovations, and how your skills in Multithreading 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).
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.
Explain your prioritization strategy, proactive communication with mentors/peers, and agile mindset.
Competitive Package (Best in Industry)
Full-Time Job
Pune, India
Nov 06, 2026
