Senior Java Developer

Company Name – Wissen Technology

Group of companies in India – Wissen Technology & Wissen Infotech

Work Location - Senior Backend Developer – Java (with Python Exposure)- Mumbai

Experience - 4 to 10 years

Kindly revert over mail if you are interested.

Java Developer – Job Description

We are seeking a Senior Backend Developer with strong expertise in Java (Spring Boot) and working knowledge of Python. In this role, Java will be your primary development language, with Python used for scripting, automation, or selected service modules. You’ll be part of a collaborative backend team building scalable and high-performance systems.

Key Responsibilities

• Design and develop robust backend services and APIs primarily using Java (Spring Boot)
• Contribute to Python-based components where needed for automation, scripting, or lightweight services
• Build, integrate, and optimize RESTful APIs and microservices
• Work with relational and NoSQL databases
• Write unit and integration tests (JUnit, PyTest)
• Collaborate closely with DevOps, QA, and product teams
• Participate in architecture reviews and design discussions
• Help maintain code quality, organization, and automation

Required Skills & Qualifications

• 4 to 10 years of hands-on Java development experience
• Strong experience with Spring Boot, JPA/Hibernate, and REST APIs
• At least 1–2 years of hands-on experience with Python (e.g., for scripting, automation, or small services)
• Familiarity with Python frameworks like Flask or FastAPI is a plus
• Experience with SQL/NoSQL databases (e.g., PostgreSQL, MongoDB)
• Good understanding of OOP, design patterns, and software engineering best practices
• Familiarity with Docker, Git, and CI/CD pipelines

• 2.5+ year of experience in Development in JAVA technology.
• Strong Java Basics
• SpringBoot or Spring MVC
• Experience in AWS.
• Hands on experience on Relationl Databases (SQL query or Hibernate) + Mongo (JSON parsing)
• Proficient in REST API development
• Messaging Queue (RabitMQ or Kafka)
• Microservices
• Any Caching Mechanism
• Good at problem solving

Good to Have Skills:

• 2+ years of experience in using Java/J2EE tech stacks
• Good understanding of data structures and algorithms.
• Excellent analytical and problem solving skills.
• Ability to work in a fast paced internet start-up environment.
• Experience in technical mentorship/coaching is highly desirable.
• Understanding of AI/ML algorithms is a plus.

Responsibilities:

 Develop and maintain high-quality, scalable, and efficient Java codebase for our ad-serving platform.

 Collaborate with cross-functional teams including product managers, designers, and other developers to

understand requirements and translate them into technical solutions.

 Design and implement new features and functionalities in the ad-serving system, focusing on performance

optimization and reliability.

 Troubleshoot and debug complex issues in the ad server environment, providing timely resolutions to ensure

uninterrupted service.

 Conduct code reviews, provide constructive feedback, and enforce coding best practices to maintain code quality

and consistency across the platform.

 Stay updated with emerging technologies and industry trends in ad serving and digital advertising, and integrate

relevant innovations into our platform.

 Work closely with DevOps and infrastructure teams to deploy and maintain the ad-serving platform in a cloud- based environment.

 Collaborate with stakeholders to gather requirements, define technical specifications, and estimate development

efforts for new projects and features.

 Mentor junior developers, sharing knowledge and best practices to foster a culture of continuous learning and

improvement within the development team.

 Participate in on-call rotations and provide support for production issues as needed, ensuring maximum uptime

and reliability of the ad-serving platform.

Key Responsibilities:   

• Should have hands-on experience with Java   

• Strong experience in Spring Boot, Micro Services   

• Should be well versed with Agile Development methodologies   

• Should have strong debugging and communication skill   

• Should participate in design discussions and provide application designs, architecture, timeline estimations   

• Problem-solving mind and attitude   

• Ability to interface well with externally facing departments and directly with customers   

• Effective communication skills – written, spoken, listening, and presentation   

• Great Team player and experience working with global teams and global organizations Genuine interest in learning and knowledge sharing   

Primary Skills:   

• 2 years of Spring Boot and Microservices.   

• 3+ years of experience in Core Java.   

• Proficiency with Spring Framework.   

• Innovate new approaches algorithms, libraries, tools, platforms, for relevant development areas   

• Strong programming skills in Core JAVA / J2EE expert level   

• Good at data structures, algorithms, problem-solving, and design patterns   

• Knowledge of Web Services, Spring, ORM Frameworks, Spring Boot, Spring Cloud Gateway, OAuth2.0, Spring Security, JWT, Eureka, Hystrix, Apache Cassandra   

• Should be well familiar with SQL/NO-SQL database   

• Knowledge of Spring Batch, Kubernetes, Docker is a plus point    

Requirements

• Overall 2-8 years of software development experience in building web-based and highly scalable applications 

• Excellent understanding of core computer science concepts like algorithms, data structure, system design, OOP, etc. 

• Deep knowledge and development expertise in Core Java and SpringBoot or other equivalent frameworks 

• Strong experience in HTML5 and CSS3 and should have basic experience in JS technologies

• Good knowledge of database concepts, having SQL writing experience, and familiarity with at least one of the relational databases

• Worked in a CI/CD environment with Jenkins

• Experience working in an agile team with software engineering practices like automated testing, test-driven development, continuous integration, etc is a big plus. 

• Ability to quickly learn and evaluate new technologies and work effectively in a fast-paced, dynamic environment

• Strong oral and written communication.

Post – Java Full Stack Developer

Total Experience – 5 to 8 years

Relevant Experience – 3 Years plus

Salary – Good Hike on CTC

Location – Bangalore, Chennai, Pune

Qualification - Graduation is must

Industry – Information Technology

Mandatory Skills –  Java, react/Angular atleast 3 years of experience, cloud Technology, Micro services Architect

Desired Skills - Machine Learning and Artificial

Roles & Responsibilities

- To drive and shape the technical roadmap & delivery of our next Enterprise Cloud based Applications driven by AI,ML products that impact millions of users on a daily basis. You will partner with a wide range of stakeholders from product, data science, and business, own and evolve the roadmap and technical strategy to build game changing tech for various teams. This is a highly critical and visible role that has a tangible impact on both internal user and external customer experience, as well as the company's bottom-line

PLEASE REPLY WITH YOUR UPDATED CV and KINDLY REFER YOUR FRIENDS / COLLEAGUES FOR THIS JOB.

• Experience in designing and developing web-based applications using Java, J2EE, Web Services, MVC framework, Servlets Spring, Hibernate, Struts, REST, MYSQL.
• Experience in Database application programming for MySQL server using
  Stored Procedures, Triggers, Views etc.
• Experienced in implementing presentation layer using JSP, HTML, CSS, Ajax, JQuery. Java script.
• Formulated AWS (EC2, S3, Elastic Beanstalk, RDS, Route53, SG, ELB, IAM, CloudWatch). (ABOVE ONLY NEEDED FOR 7+ EXPERIENCE)
• Experienced in Analysis, Design, Development, Integration, Deployment
  and Maintenance of Web services, Client Server and Web based applications.
• Well versed with Agile development process, Scrum.
• Good knowledge in version control system tools like GIT.
• Ability to take independent responsibility as well as ability to contribute and be a productive team member.
• Excellent analytical, logical and programming skills, Self-Motivated, Self-Starter, Team Player can work with minimal supervision with effective Communication
  skills and Organizational skills combined with attention and Time management skills.

Required Experience : 2 to 6 Years

Technical Skillsets Required :