
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 JD
Exp: -2- 4 Years
Location: - Manyata Tech Park, Bangalore, Karnataka, India
Immediate Joiners-15 Days
Job Responsibilities
- Strong experience with Spring and Spring Boot, Spring MVC, Spring Data, Spring Security
- • Exposure working in microservices and containerization(Docker/Kubernetes)
- • Experience with Web Services (JSON, REST, JAX-RS, Spring based REST services)
- • Strong with Java and J2EE/Java EE (including servlets, JSP, JSF, JDBC)
- • Strong understanding of Java Multithreading
- • Experience working with DB like Mongo, Casandra etc.
- • Experience with at least one of the development tools like Git, Gradle, Maven, Sonar, Jenkins, Artifactory etc
- • Experience with web application servers like Tomcat, Jetty, JBoss etc
- • Experience with TDD, code testability standards, JUnit/Mockito
- • Experience with DevOps practices and CICD model of development
- • Good understanding of OOP, design patterns and industry best practices
- • Agile project experience along with working on Agile tools like JIRA
- • Strong written and verbal communication skills
- Good to have Skills:
- • Strong interpersonal skills and time management skills
- • Strong analytical and troubleshooting skills
Job Title: Lead Java Developer
Experience Required: 7+ Years
Location: Mumbai
About the Role
We are seeking a highly skilled Senior Backend Developer with deep expertise in building scalable, high-performance applications. The ideal candidate will have strong hands-on experience with Java, Spring Boot, Microservices, and distributed systems. You will play a key role in designing and optimizing APIs, architecting robust systems, and collaborating with cross-functional teams to deliver innovative solutions.
Key Responsibilities
- Design, develop, and maintain scalable backend systems using Java, Spring Boot, and Microservices architecture.
- Build and optimize APIs for large-scale applications ensuring high performance and reliability.
- Apply clean coding principles, SOLID design patterns, and clean architecture to deliver maintainable and robust code.
- Work with distributed systems technologies (Kafka, ELK, in-memory databases, Cassandra, or similar).
- Write efficient SQL queries and integrate with relational and NoSQL databases.
- Collaborate with product managers, architects, and other developers to define and align on technical decisions.
- Identify and solve complex problems with innovative and scalable solutions.
- Drive best practices in coding standards, system design, and performance optimization.
- Communicate complex technical concepts clearly across teams and stakeholders.
Skills & Qualifications
- 7+ years of experience as a Backend Developer.
- Strong expertise in Java, Spring Boot, Microservices, SQL.
- Significant experience in API design and optimization for enterprise-scale applications.
- Proficiency in distributed systems & related technologies (Kafka, ELK, in-memory DBs, Cassandra, etc.).
- Strong understanding of object-oriented engineering principles (SOLID, clean architecture).
- Excellent problem-solving and analytical skills with the ability to simplify complex concepts.
- Strong communication and collaboration skills, with the ability to influence and align teams.
Software Development Engineers will be responsible to participate in all stages of
the software product development life cycle. This will include analyzing system
and user requirements, designing software flowcharts, writing clean Java code,
troubleshooting bugs, and running tests to improve system functionality.
An ideal candidate would be someone who has proficiency in Java technologies,
good analytical skills, the ability to anticipate issues and frame remedial actions,
and excellent teamwork skills.
What will you be doing?
● Write simple, efficient, and maintainable code.
● Design, develop, scale and maintain backend services in Java
● Manage individual priorities, deadlines, and deliverables.
● Validating the functionality and security of the application.
● Function well in a fast-paced, rapidly changing environment
● Ensuring best coding standards and practices to improve and maintain
quality.
● Meeting with the engineering and product team to discuss project definitions
and goals.
What will you need ?
● Bachelor/Master degree in CS or related field from a reputed college
● Sound knowledge of Java technologies.
● Solid grip on the programming basics like DS and algorithms, OOPS.
● Understanding & experience with software design pattern, restful APIs and
microservice architecture
● Experience with software design and application programming.
● Prior experience in start-ups or health-tech will be a plus
- You solve problems at their root, stepping back to understand the broader context.
- You develop pragmatic solutions and build flexible systems that balance engineering complexity and timely delivery, creating business impact.
- You understand a broad range of data structures and algorithms and apply them to deliver high-performing applications.
- You recognize and use design patterns to solve business problems.
- You understand how operating systems work, perform and scale.
- You continually align your work with Amazon’s business objectives and seek to deliver business value.
- You collaborate to ensure that decisions are based on the merit of the proposal, not the proposer.
- You proactively support knowledge-sharing and build good working relationships within the team and with others in Amazon.
- You communicate clearly with your team and with other groups and listen effectively.
MUST HAVES:
- #java11, Java 17 & above only
- #springboot #microservices experience is must
- #cloud experience is must (AWS or GCP or Azure)
- Strong understanding of #functionalprogramming and #reactiveprogramming concepts.
- Experience with asynchronous programming and async frameworks/libraries.
- Proficiency in #sql databases (MySQL, PostgreSQL, etc.).
- WFO in NOIDA only.
Other requirements:
- Knowledge of socket programming and real-time communication protocols.
- Experience of building complex enterprise grade applications with multiple components and integrations
- Good coding practices and ability to design solutions
- Good communication skills
- Ability to mentor team and give technical guidance
- #fullstack skills with anyone of #javascript or #reactjs or #angularjs is preferable.
- Excellent problem-solving skills and attention to detail.
- Preferred experience with #nosql databases (MongoDB, Cassandra, Redis, etc.).
Responsibilities:
- Ensure the quality of architecture and design of systems.
- Functionally decompose complex problems into simple, straight-forward solutions.
- Analyze and improve data quality and metrics.
- Fully and completely understand system interdependencies and limitations.
- Leverage knowledge of internal and industry in design decisions.
- Assist in the career development of others, mentoring on advanced technical issues and helping managers guide the career growth of their team members.
- Exert technical influence over multiple teams, increasing their productivity and effectiveness by sharing your deep knowledge and experience.
- Skilled in translating high level abstract business requirements into software design, designing systems specifications, standards, and programming
- Contribute to Architectural blueprints and Design for the software solutions
- Mentor team on engineering best practices such as writing clean code, designing scalable, reliable and performant software solutions, set and ensure compliance to software quality standards etc.
- Be a role model for the team with innovative thinking, passion for continuous learning and contributions to the project.
Qualifications, Skills & Experiences
- BE / B.Tech /M.Tech in Computer Science or a related field
- Minimum 7+/5+ years of experience building large scalable systems
- Minimum 2+ years of recent experience in building products on cloud is a plus
- Knowledge of asynchronous programming and WebAPI development is required
- Knowledge and awareness of cloud/ application security is must (OWASP at the minimum)
- Strong knowledge in OOPS with C#, .Net(or Java) with SQL Server or any RDBMS
- Strong experience in architecting and building multi-threaded, distributed systems.
- Strong knowledge of data structures, algorithms, and designing for performance.
- Ability to achieve stretch goals in a highly innovative and fast paced environment.
- Extensive experience of mentoring junior engineers to success.
- Experience with Microservices Architecture is a plus
- Working knowledge of CI/CD pipelines and AWS/Azure cloud services is plus
- Hands on experience of building products for unix systems in addition to windows is a plus
- Excellent Communication
1. Strong knowledge in Front end scripting like EJS, JavaScript, Jquery.
2. Proficiency with fundamental front-end languages such as HTML, CSS.
3. Familiarity with JavaScript frameworks such as Angular JS, React, and Amber.
4. Proficiency with server-side languages such as Python / Ruby / Java / PHP/ .Net.
5. Good Understand with database technology such as MySQL, Oracle, and MongoDB.
- Strong Java software development experience – with a focus on Java 8 & 9
- Experience with NoSql databases – ideally with MongoDB
- Experience implementing REST apis – ideally with JAX-RS
- Experience with Reactive Programming – ideally with RxJava
- Experience implementing unit tests
Preferred Qualifications
- Experience developing applications in fintech or established financial institutions
- Experience with microservice architectures
- Experience developing systems that can scale to large amounts of data
- Experience working in Agile Scrum
- Experience working on a globally distributed team












