Java +Spark+ETL

🧠 Job Description: Senior Java Developer (8+ Years Experience)

Location: Mumbai, India

Employment Type: Full-time, Hybrid mode of working

Company: Wissen Technology

Website: www.wissen.com

🚀 About Wissen Technology

Wissen Technology is a specialized technology consulting firm delivering cutting-edge solutions to global leaders in Banking & Finance, Telecom, and Healthcare. Established in 2015 and part of the Wissen Group (founded in 2000), Wissen has scaled rapidly with impressive impact and recognition.

• 🌍 Offices in US, UK, India, Australia, Mexico, and Canada
• 👥 1700+ Wissen Technology professionals; part of a 4500-strong Wissen Group
• 🏆 Great Place to Work® Certified
• 🧠 Featured as a Top 20 AI/ML Vendor (CIO Insider, 2020)
• 📈 Achieved 400% revenue growth in 5 years (with zero external funding)
• 💼 Delivered $1B+ worth of projects to 50+ Fortune 500 companies

Learn more about our work and thought leadership:

📄 Articles by Wissen | 💼 LinkedIn

About the Role

We are seeking an experienced Senior Java Developer with 8+ years of hands-on expertise in building scalable, high-performance applications. The ideal candidate will have strong fundamentals in Java, OOPS, Multithreading, Spring concepts, and SQL, and will play a key role in designing, developing, and optimizing enterprise-grade solutions.

Key Responsibilities

• Design, develop, and maintain complex applications using Core Java and Spring frameworks
• Apply advanced Object-Oriented Programming (OOPS) principles to deliver clean, modular, and reusable code
• Implement and optimize multithreaded applications for high-performance systems
• Work with SQL databases for efficient data modeling, query optimization, and integration
• Collaborate with cross-functional teams to gather requirements and translate them into technical solutions
• Conduct code reviews, troubleshoot issues, and ensure adherence to best practices
• Mentor junior developers and contribute to technical knowledge sharing within the team
• Ensure application scalability, performance tuning, and security compliance

Required Skills & Qualifications

• Bachelor’s/Master’s degree in Computer Science, Engineering, or related field
• 8+ years of professional experience in Java development
• Strong expertise in Core Java, OOPS, and Multithreading
• Hands-on experience with Spring concepts (Spring Core, Spring MVC, Spring Boot preferred)
• Proficiency in SQL and database design (MySQL, Oracle, PostgreSQL, etc.)
• Solid understanding of software development life cycle (SDLC) and Agile methodologies
• Strong analytical, problem-solving, and communication skills

🌟 Why Wissen?

Join a company that combines start-up agility with enterprise stability. Work alongside some of the brightest minds from institutions like MIT, Wharton, IITs, IIMs, and NITs. Be part of mission-critical projects for Fortune 500 giants, and grow in a culture that invests in your future.

Role Overview

We are seeking a motivated and technically versatile CMS Engineer (IC2) to support our transition from SharePoint to Contentful, while also contributing to the broader CMS ecosystem. This is an excellent opportunity for an early-career engineer to work on enterprise-grade platforms and microservice-based architectures.

Key Responsibilities

·         3-5 years of experience with SharePoint Online and/or enterprise CMS platforms.

·         Familiarity with Contentful or other headless CMS solutions is a strong plus.

·         Hands-on experience with Java, Spring Boot, and relational databases (e.g., PostgreSQL).

·         Exposure to Kafka, Elasticsearch, or similar distributed technologies is desirable.

·         Solid problem-solving and communication skills with an eagerness to learn.

What would you do here

SharePoint to Contentful Migration | Backend + CMS Integration

·         Assist in maintaining and enhancing SharePoint Online content and features during the transition period.

·         Support the migration of pages, documents, and metadata from SharePoint to Contentful.

·         Contribute to the design and development of backend services that integrate with Contentful using Java, Spring Boot, and REST APIs.

·         Write reusable services for content delivery, search indexing (via Elasticsearch), and event processing (via Kafka).

·         Help develop APIs for CMS-based applications that interact with PostgreSQL databases.

·         Troubleshoot CMS-related issues and support testing efforts during platform migration.

Job Description – Senior Java Developer (Spring Boot / Microservices)

Location: Chennai, India

Experience: 4+ Years

Availability: Immediate Joiner

About the Role:

We are looking for a highly skilled Java Developer with over 5 years of hands-on experience in building scalable backend systems using Java, Spring Boot, and Microservices architecture. The ideal candidate will have strong problem-solving skills, deep knowledge of backend frameworks, and a solid understanding of JUnit-based testing.

Key Responsibilities:

• Design, develop, and maintain high-performance backend systems using Java and Spring Boot
• Develop and deploy RESTful microservices in a distributed architecture
• Collaborate with cross-functional teams to define, design, and ship new features
• Write clean, scalable, and testable code following best practices
• Implement unit and integration tests using JUnit and other testing frameworks
• Participate in code reviews and contribute to improving team processes
• Troubleshoot and resolve production issues in a timely manner

Key Skills:

• Strong proficiency in Java
• Expertise in Spring Boot and related modules (Spring Data, Spring Security, etc.)
• Solid understanding of Microservices architecture, REST APIs, and inter-service communication
• Experience with JUnit and writing automated test cases
• Familiarity with CI/CD pipelines and version control (Git)
• Knowledge of containerization (Docker, Kubernetes) is a plus
• Exposure to messaging systems like Kafka or RabbitMQ is a plus
• Familiarity with databases (SQL/NoSQL)

Roles and Responsibilities:

• Individuals are responsible for all traditional development activities analysis, design, coding, testing, and documentation.
• Add new features to existing Windows and Web-based applications in Visual Studio 2019. Interacting with internal team.
• Transform business and design needs into innovative products.
• Drive all projects to completion within deadlines.
• Perform thorough testing to find issues ahead of time.
• Engineering software needs more precise analysis & coding skillset
• Enhance skillset by working with fortune 500 clients
• Interacting with internal team.

Qualifications :

• B.E in computer science or related fields.
• Excellent programming & communication skills Strong problem solving, judgmental, and decision-making skills.
• Ability to work at the tactical and strategic levels of IT initiatives.
• Impressive hands-on experience in Java, database(Oracle), OOPS, Java Swing, Javafx.
• Self-Motivated, flexible & Innovative.

Type, Location: Remote, India

Desired Experience: 2+ years

Roles and Responsibilities :

• Hands-on GoLang development
• Go Lang developers perform tasks related to the design, development, modification, and administration of software systems and applications.
• Comfortable with algorithm design, scripting, and unit testing.
• Demonstrated skills in debugging, design patterns, and enterprise resource planning.
• Is skilled at problem-solving.

Must have skills :

● You must have 2+ years Golang experience.

● You must have (React.js or Node.js or Python or Java )experience.

● You must have any Frontent or Backend Technology with Golang 

JD:

As a Software Development Engineer at Amazon, you have industry-leading technical abilities and demonstrate breadth and depth of knowledge. You build software to deliver business impact, making smart technology choices. You work in a team and drive things forward.

Responsibilities:

• 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 recognise and use design patterns to solve business problems.
• You understand how operating systems work, perform and scale.

Requirements:

• You write high quality, maintainable, and robust code.
• You recognise and adopt best practices in software engineering: design, testing, version control, documentation, build, deployment, and operations.
• You have experience building scalable software systems that are high-performance, highly-available, highly transactional, low latency and massively distributed.
• Bachelors or Masters in Computer Science or relevant technical field.
• Experience in software development and full product life-cycle.
• Excellent programming skills in any object oriented programming languages - preferably Java, C/C++/C#, Perl, Python, or Ruby.
• Strong knowledge of data structures, algorithms, and designing for performance, scalability, and availability.
• Proficiency in SQL and data modeling.

• Have architected /designed at least 2-3 systems/products of enterprise scale from scratch.
• Have banking and Financial service background and preferably worked in Mobile/Digital platform design and development. Payments /OLTP preferred.
• Should have experience of 20+ years with J2ee, REST, Microservice, API, Messaging, Encryption, security, NLP, ML background.
• Have 7+yrs of experience in Architecture field, designing and end to end not from consulting Architecture.
• Responsible for design, architecture, and delivery of a feature or component/product with the highest quality with high-level directions from architects
• Driving innovations in the platform constantly & remaining ahead of the curve
• Development and testing of features/functions delivered via applications and services.
• Prototype ideas quickly using cutting edge technologies.
• Collaborating with peers and Architects both within their team and across the organization to deliver end-to-end products & features
• Working with product managers using agile methodologies to deliver high quality solutions on time
• Provide functional, design, and code reviews in related areas of expertise with-in team and cross-team.
• Working with operations teams to ensure your applications and services are highly available and reliable
• Mentoring junior engineers in the team both in the technical as well as on the product side
• Define and devise processes, tools and methodologies to achieve excellence in software development, testing and deployment, and in the management of the Centre.
• Good experience in working with any of the programming languages like PHP, Python, Django, Golang, Java, C++
• Experience developing applications that use high volume of data along with experience building applications on top of RESTful APIs.
• Solid knowledge of JAVA, J2EE, data stream, processing, big data etc.
• Comfortable with writing unit tests using JUnit
• Worked with Git and are comfortable with Merge/Rebase concepts.
• Worked with tools such as Eclipse, WebStorm, Ant, Maven, Jenkins, Sonar, JSLint, Grunt and App Servers such as Tomcat, Jboss.
• Solid knowledge of algorithms, design patterns, and componentization approaches.
• Experience and knowledge of open source software, frameworks and broader cutting-edge technologies.
• Experience in software design patterns, problem solving and troubleshooting skills.
• Ability to determine impact of architectural solutions and recommendations.
• Must have experience in justification of technology solutions to business leaders.
• Experience in refactoring existing codebase and in understanding existing implementations to decide to refactor or rewrite.
• Know how to identify Performance bottlenecks and use good coding patterns to avoid them in the first place.
• Have strong attention to detail.
• Ability to operate effectively both independently as well and within a team using Agile methodology.
• Proven problem-solving and interpersonal communication skills.
• Knowledge of payment domain will be an added advantage

Qualifications

• BE/BTech/ME/MTech in EE/CS or an equivalent qualification.
• 20+yrs of Experience.
• Minimum 12+years of hands on Java programming experience.

We are looking for a Java Developer with experience in building high-performing, scalable, enterprise-grade applications.

You will be part of a talented software team that works on mission-critical applications. Java developer roles and responsibilities include managing Java/Java EE application development while providing expertise in the full software development lifecycle, from concept and design to testing.

Java developer responsibilities include designing, developing and delivering high-volume, low-latency applications for mission-critical systems.

• Contribute in all phases of the development lifecycle
• Write well designed, testable, efficient code
• Ensure designs are in compliance with specifications
• Prepare and produce releases of software components
• Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review

• BS/MS degree in Computer Science, Engineering or a related subject
• Proven hands-on Software Development experience
• Proven working experience in Java development
• Hands on experience in designing and developing applications using Java EE platforms
• Object Oriented analysis and design using common design patterns.
• Profound insight of Java and JEE internals (Classloading, Memory Management, Transaction management etc)
• Excellent knowledge of Relational Databases, SQL and ORM technologies (JPA2, Hibernate)
• Experience in the Spring Framework
• Experience as a Sun Certified Java Developer
• Experience in developing web applications using at least one popular web framework (JSF, Wicket, GWT, Spring MVC)
• Experience with test-driven development