
Experience in Core Java and Spring Boot.
• Extensive experience in developing enterprise-scale applications and systems. Should possess good architectural knowledge and be aware of enterprise application design patterns.
• Should have the ability to analyze, design, develop and test complex, low-latency clientfacing applications.
• Good development experience with RDBMS.
• Good knowledge of multi-threading and high-performance server-side development. • Basic working knowledge of Unix/Linux.
• Excellent problem solving and coding skills.
• Strong interpersonal, communication and analytical skills.
• Should have the ability to express their design ideas and thoughts.
Please find the attached study material.
Data structure and Algorithms-
1. Basic Strings, Array and Mathematical based problems.
2. Sliding window problems
3. Problems solved using HashMap, Set and Stack.

About Wissen Technology
About
The Wissen Group was founded in the year 2000. Wissen Technology, a part of Wissen Group, was established in the year 2015. Wissen Technology is a specialized technology company that delivers high-end consulting for organizations in the Banking & Finance, Telecom, and Healthcare domains.
With offices in US, India, UK, Australia, Mexico, and Canada, we offer an array of services including Application Development, Artificial Intelligence & Machine Learning, Big Data & Analytics, Visualization & Business Intelligence, Robotic Process Automation, Cloud, Mobility, Agile & DevOps, Quality Assurance & Test Automation.
Leveraging our multi-site operations in the USA and India and availability of world-class infrastructure, we offer a combination of on-site, off-site and offshore service models. Our technical competencies, proactive management approach, proven methodologies, committed support and the ability to quickly react to urgent needs make us a valued partner for any kind of Digital Enablement Services, Managed Services, or Business Services.
We believe that the technology and thought leadership that we command in the industry is the direct result of the kind of people we have been able to attract, to form this organization (you are one of them!).
Our workforce consists of 1000+ highly skilled professionals, with leadership and senior management executives who have graduated from Ivy League Universities like MIT, Wharton, IITs, IIMs, and BITS and with rich work experience in some of the biggest companies in the world.
Wissen Technology has been certified as a Great Place to Work®. The technology and thought leadership that the company commands in the industry is the direct result of the kind of people Wissen has been able to attract. Wissen is committed to providing them the best possible opportunities and careers, which extends to providing the best possible experience and value to our clients.
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Java Developer – Backend (Spring Boot + WebFlux)
Company Overview
Dive into the galaxy of innovative possibilities and unfold the future with Pattem Digital. We are a leading software product development company specializing in delivering 100+ services across frontend, backend, CMS, and cutting-edge technologies. With a global presence and proven track record, we help businesses scale through agile and efficient software solutions.
Position Overview
We are looking for a skilled Java Backend Developer with strong expertise in Core Java, Spring Boot, and Spring WebFlux. The ideal candidate will be responsible for building scalable backend systems, developing reactive and RESTful APIs, and contributing to high-performance applications.
📍 Location: Whitefield, Bangalore (Onsite – 5 Days/Week)
📅 Experience: 5–6 Years
Key Responsibilities
● Develop and maintain backend services using Java, Spring Boot, and Spring WebFlux
● Design and implement RESTful and reactive APIs for scalable applications
● Work with databases (SQL/NoSQL – MongoDB preferred)
● Implement multithreading, concurrency, and reactive programming for performance optimization
● Collaborate with frontend teams, QA, and product managers
● Debug, troubleshoot, and resolve production issues
● Write clean, maintainable, and efficient code
● Participate in code reviews and maintain coding standards
● Ensure application performance, scalability, and security
Required Qualifications
Technical Skills
● Strong hands-on experience in Core Java (OOPs, Collections, Multithreading)
● Experience with Spring Boot, Spring MVC, and Spring WebFlux
● Good understanding of Microservices architecture
● Experience with MongoDB / SQL databases
● Knowledge of Java Streams, Exception Handling, Concurrency, and Reactive Programming
● Familiarity with Linux environment
● Experience with Git, Maven, CI/CD pipelines
● Understanding of API design, reactive systems, and system architecture
Experience & Education
● 5–6 years of experience in backend development
● Bachelor’s degree in Computer Science or related field
Soft Skills
● Strong problem-solving and analytical skills
● Good communication and teamwork abilities
● Ability to work in a fast-paced environment
● Ownership mindset and attention to detail
Preferred Qualifications
● Experience with Kafka or event-driven architecture
● Exposure to AWS or cloud platforms
● Experience working in Reactive systems / high-throughput applications
● Experience working in Agile environments
Location: Bangalore
Experience: 7-10 years
Job Type: Full-time
Overview:
We are seeking a skilled Java Lead with 7-10 years of experience for our Bangalore office. The ideal candidate will have a strong background in Java development, team leadership, and client-facing roles.
Key Responsibilities:
- Lead a team of Java developers, providing guidance and mentoring to ensure high-quality code and timely delivery.
- Collaborate with clients to understand requirements, present solutions, and manage expectations.
- Design, develop, and maintain complex Java-based applications.
- Ensure the team adheres to best practices in coding, testing, and documentation.
- Manage project timelines, deliverables, and resources effectively.
- Troubleshoot and resolve technical issues, ensuring smooth project execution.
Required Skills:
- Java Development: Extensive experience in Java, including frameworks like Spring and Hibernate.
- Team Leadership: Proven ability to lead and mentor a team of developers.
- Client Interaction: Strong client-facing skills with experience in requirement gathering and solution presentation.
-Project Management: Experience in managing project timelines and resources.
Preferred Qualifications:
- Experience with microservices architecture and cloud platforms.
- Familiarity with agile development methodologies.
- 4+ years exp with solid backend/engineering experience.
- Knowledge of data structures and an eye for architecture.
- Solid CS fundamentals, fluent in multi-threaded and asynchronous programming, a strong inclination for architecting at scale.
- Excellent technical design, problem-solving, debugging, and communication skills.
- Rapid prototyping worked on distributed systems at scale.
- Basic knowledge of SQL as well as NoSQL databases.
- Proficient in Golang, it's design, and concurrency patterns.
Experience: 2 years - 4 years
providing 100% remote
We love solving hard problems together because the hardest challenges are often the most rewarding. You will have an opportunity to create products that will disrupt the industry. Providing customer delight is not just a phrase for us - It’s our mantra, Voice will always be heard - we encourage different points of view.
Do you aspire to be a tech ninja?
Do you have a passion for building products in India and changing the worldview that we are just about services?
We want people who go deep and understand the fundamentals
RESPONSIBILITIES:
- Development and maintenance of automatic regression tests suites used in the product delivery process
- Development and maintenance of testing frameworks supporting the automatic regression testing
- Management and tracking of automatic regression test suite execution
- You will own some or all of a product/feature. You will also mentor others, read and review code, maintain code, deploy code, and tune the performance of systems.
SKILLS AND ABILITIES:
- We’re looking for 2 - 4 years of experience. However, the number is irrelevant if you have the necessary skills.
- Strong proficiency in Java, J2EE, JDBC, Spring MVC & Boot, Hibernate, PL/SQL, HTML, CSS, JavaScript and JQuery, Ajax
- Good exposure to RESTful API concept and JSON
- Experience with cloud-based technologies such as AWS.
- Proficient understanding of development tools such as SVN, GIT
- Good communication skills with proficiency in English (Oral and Writing) / banking knowledge.
Plus Points:
- Product experience
- Startup experience
- Technologies that are Self-taught
- Contributed to stock exchange etc
- Open source contributions
- Any of your work in public that we can see
Job Description:
- Resource should be proficient in analyzing, designing and developing applications based on the requirements provided by business counterparts
- Developing and maintaining applications developed in Java, J2EE, Struts and Spring and possessing 3-layer architecture
- Good knowledge in Spring Boot, Hibernate, Angular JS, Docker, VUE JS and AWS
- Applications development or maintenance using ORM tools such as Hibernate
- Database management which includes DB design and maintenance, mostly related to 2016 and Oracle 19c, DB2
- Should have knowledge in Unix / Linux OS.
- Should have good knowledge in Shell scripting language
- Strictly adhere to the internal SDLC process quality standards set but the organization and providing the drive to the team to achieve the KPI and SLA targets
- Flexible to work in extended time
- Candidate should have good experience on Java / J2EE, Springboot, Hibernate / JPA, Oracle query, Web Services and Rabbit MQ.
- Should have minimum of 3 to 5 years of experience. Should be able to work on enhancement, maintenance and production support.
- Good to have hands-on experience on DEVOPS & API development.
- Work on building scalable backend platform for customer & seller apps, brands platform, demand generation platform, supply chain & logistics platform, credit platform and several cross platform software components
- Participate in the process to fundamentally change the food and grocery ecosystem in India, and impact billions of people through technology, mobile, and data science
Requirements:
An ideal candidate for this role is someone who has-
- BE/BTech degree in Computer Science from a top engineering school
- 1-5 years of professional software development experience
- Strong problem solving skills and strong command on object oriented design, data structures, algorithms and other computer science fundamentals.
- Strong coding skills - professional experience in developing production-quality software in Java/Python
- Expertise in Web Services, Service-oriented architecture, Databases, NoSQL, Distributed systems, Cloud Technologies.
- Extreme software engineering skills to design and develop low-latency, high availability, internet-scale web services
- Solid understanding of the full software development life cycle and software engineering best practices
- Ability to understand business requirements and translate them into technical requirements
- Demonstrated ability to own software design and development end to end from requirements to launch.
- Ability to collaborate with cross-functional teams to define, design, and ship new features.
- A startup mindset - An athlete who can run at breakneck speed of a startup, yet someone who can bring method to madness through processes suitable for different stages of the company - early stage prototyping and rapid experimentation, before product/market fit, after product/market fit, and scaling.
- Familiarity with Agile development, Scrums, continuous integration, and test driven development processes
- Data driven product development approach - strong focus on data backed engineering decisions.
- Ability to develop products incrementally in fast iterations
- Ability to do collaborative problem solving and design/build chaos resilient systems
- Strong focus on software quality
- Ability to mentor junior developers, and help build an excellent engineering team
- Ability to be a talent magnet - attract great talent to join the core team.








