java Consultant

About Wissen Technology

Wissen Technology, established in 2015 and part of the Wissen Group (founded in 2000), is a specialized technology consulting company. We pride ourselves on delivering high-quality solutions for global organizations across Banking & Finance, Telecom, and Healthcare domains.

For more details:

Website: www.wissen.com

Wissen Thought leadership : https://www.wissen.com/articles/

LinkedIn: Wissen Technology

Role: Java Backend Developer with AWS

Key Responsibilities

● Design & Development: Build robust, scalable, and maintainable backend services using Java 17+ and the Spring Boot ecosystem.

● API Design: Develop and document RESTful for consumption by web and mobile frontends.

● Database Management: Optimize complex queries and design schemas for relational (PostgreSQL, MySQL) and/or NoSQL (MongoDB, DynamoDB) databases.

● Microservices Architecture: Contribute to the migration or maintenance of microservices, ensuring high availability and low latency.

● Code Quality: Perform thorough code reviews and write comprehensive unit, integration, and functional tests (JUnit, Mockito).

● Cloud & DevOps: Deploy and manage applications in AWS using Docker and Kubernetes.

● Collaboration: Work closely with Frontend Developers, Product Managers to translate business requirements into technical specifications.

Required Technical Skills

● Java Mastery: Deep understanding of Core Java, Multithreading, and Stream API.

● Frameworks: Extensive experience with Spring Boot, Spring Security, and Spring Data JPA/Hibernate.

● Cloud Experience: Proficiency with cloud-native services (e.g., AWS Lambda, S3, RDS, or SQS).

● Messaging: Experience with message brokers like Apache Kafka for asynchronous processing.

● CI/CD: Hands-on experience with Jenkins, GitLab CI, or GitHub Actions.

● Version Control: Expert-level knowledge of Git and branching strategies.

Qualifications & Soft Skills

● Experience: 5+ years of professional experience in backend development.

● Problem Solving: Ability to debug complex production issues and performance bottlenecks.

● Communication: Excellent verbal and written communication skills—vital for a remote/hybrid contractor setup.

● Adaptability: Proven ability to quickly learn new codebases and business domains.

Job Summary

We are seeking an experienced Java + Kafka Developer to design, develop, and maintain high-performance, event-driven applications. The ideal candidate will have strong backend development skills in Java and hands-on experience with Apache Kafka for building scalable, real-time data processing systems.

Key Responsibilities

• Design and develop event-driven microservices using Java and Apache Kafka
• Build and maintain Kafka producers, consumers, topics, and streams
• Implement message processing, retries, error handling, and idempotency
• Develop and integrate RESTful APIs
• Ensure high availability, scalability, and performance of Kafka-based systems
• Monitor, troubleshoot, and optimize Kafka and application performance
• Collaborate with architects, DevOps, and QA teams
• Participate in code reviews and follow best practices
• Contribute to system design and technical discussions

Required Skills

• 6+ years of experience in Java backend development
• Strong hands-on experience with Apache Kafka
• Experience with event-driven and streaming architectures
• Solid understanding of microservices architecture
• Experience with REST APIs
• Good knowledge of multithreading, concurrency, and JVM concepts
• Familiarity with SQL / NoSQL databases
• Strong problem-solving and debugging skills

Key Responsibility Areas:

• Design, build and deliver Enterprise software solutions.
• Write code with standards and conventions and follow best practices.
• Encourage and lead innovation and solid lifecycle processes.
• Collaborate with development teams on work definition, estimation and prioritization
• Lead and grow as a professional software engineer.
• Full ownership of product deliveries and mentoring junior team members.
• Preparing curriculum to train junior developers for Java Web Development
• Strong client interactions to provide excellent Quality of Service.
• Owning the code base and making sure all code is reviewed and is of very high quality.
• Write and modify coding conventions and standards documents for all development

Required Skills:

Technologies/Frameworks – 

• Core Java, J2EE, 
• Spring Core and Spring MVC, Sprint Boot, Spring Security, 
• JDBC, Hibernate, RESTful APIs, SOAP WebServices
• Knowledge of JavaScript, JQuery, AJAX, HTML5, and CSS3, Angular is added advantage
• Junit or Mockito frameworks
• Maven, Git
• Knowledge Data Structures, 
• SQL, MySQL 
• Designing relational database schemas
• Basics of AWS, Cloud, Microservices

• Must have strong knowledge and experience in Agile based software development methodologies. Knowledge of an Agile tool like Jira.
• Strong knowledge of working in Integrations of 3^rd party APIs and creating the new APIs.
• Must have good knowledge of creating Flow diagrams, UMLs and all the required documentations.
• Domain Preference
• BFSI, FinTech

JOB DESCRIPTION:

• Design, develop, and maintain low-latency, high-performance enterprise applications using Core Java (Java 5.0 and above).
• Implement and integrate APIs using Spring Framework and Apache CXF.
• Build microservices-based architecture for scalable and distributed systems.
• Collaborate with cross-functional teams for high/low-level design, development, and deployment of software solutions.
• Optimize performance through efficient multithreading, memory management, and algorithm design.
• Ensure best coding practices, conduct code reviews, and perform unit/integration testing.
• Work with RDBMS (preferably Sybase) for backend data integration.
• Analyze complex business problems and deliver innovative technology solutions in the financial/trading domain.
• Work in Unix/Linux environments for deployment and troubleshooting.

Required Skills & Experience:

• 4– 12 years of strong hands-on experience in Core Java.
• Deep understanding of Object-Oriented Programming (OOP), data structures, algorithms, and design patterns.
• Proven experience with Spring, CXF, and REST/SOAP web services.
• Solid understanding of microservices architecture and distributed systems.
• Experience working with Sybase or other relational databases.
• Expertise in multithreading, concurrency, and high-throughput server-side development.
• Exposure to capital markets, sales & trading platforms, or similar financial services applications.
• Good working knowledge of Unix/Linux environments.
• Experience in solution architecture and design documentation is a strong plus.
• Strong problem-solving skills, analytical thinking, and a proactive attitude.
• Excellent communication and interpersonal skills to work effectively with global teams.

Preferred Qualifications:

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.
• Previous experience in investment banking, capital markets, or financial technology domains.

Why Join Wissen Technology?

• Be a part of a high-growth organization that has expanded 400% in the last five years.
• Work alongside leadership and engineers from IITs, IIMs, MIT, Wharton, and other top institutions.
• Engage with Fortune 500 clients and deliver high-impact projects.
• Certified as a Great Place to Work®.
• Recognized as a Top 20 AI/ML Vendor by CIO Insider (2020).
• Work on next-gen technologies: AI/ML, Big Data, Cloud, DevOps, RPA, and more.
• Global presence across US, India, UK, Australia, Mexico, and Canada.

Website : www.wissen.com 

• Experience in designing and developing applications using Java, Spring Boot, microservices, Spring, and Hibernate frameworks
• Proficiency in core Java, J2EE, Springboot, and Hibernate
• Hands-on experience with front-end and back-end Java technologies
• Solid understanding of OOP software design concepts and implementation using Java
• Demonstrated ability to develop software application services using Java 8 and Spring Boot
• Familiarity with frameworks like Spring Boot and database layers like Hibernate
• Knowledge of HTML, CSS, JavaScript, and critical thinking and problem-solving skills
• Strong coding/debugging abilities with advanced knowledge of Java and .NET
• Experience with REST, SOAP web services, Spring, and Hibernate
• Strong understanding of object-oriented design using Java language
• Proficient in Java development with knowledge of SQL, multithreading, Spring Boot, and Hibernate
• Experience with Java frameworks such as Spring IOC, Spring MVC, Struts, and Hibernate
• Ability to develop components using Java and J2EE technologies
• Knowledge of popular design patterns and Java frameworks
• Strong automation background with experience in leading automation implementation using Selenium and Java
• Experience in developing high-performance, scalable applications using Java and JEE
• Solid programming skills with a good grasp of OOP concepts, preferably in Java
• Understanding of Java, J2EE server, JavaScript, and DOM
• Experience in writing automation scripts using Java languages
• Good framework understanding like Spring Boot and database layers like Hibernate

Requirements:

 Strong development skills in Core / Advanced Java, and J2EE.

 Knowledge of Bamboo, Jira, Spring AOP, Junit, SQL query optimization and fine tuning, is a

plus.

 Strong analytical skills.

 Good in Design Patterns.

 Should have experience on JMS/Messaging and middleware like IBM MQ/Apache Kafka.

 Strong in design and technical documentation.

 Strong in Java SDK 1.8, Java SDK 11, Spring Boot (Embedded Tomcat), REST & SOAP API skills.

 Strong in Spring frameworks (MVC, IOC, Boot, Batch) and ORM framework like Hibernate.

 Hands-on experience in SQL.

 Core Java, J2EE, SOA based Web Services, RESTful Web Services, Hibernate, Spring MVC,

XSD, XML and WSDL, DB, Microservices.

 Understanding of Kafka and Netflix conductor.

 Should have worked with Maven/Gradle, JIRA/Rally, Bamboo/Jenkins/Hudson.

 Extensive development experience with Web Services (SOAP and REST).

• Candidates with good experience with SDLC
• Minimum 3+ years of hard core coding experience is mandatory
• Excellent hands on coding in Java, J2EE, Spring, Struts

We are looking for motivated individuals who are keen to work on Cloud or Big Data services or have worked on Cloud and Big Data. If you want to work in a start-up culture and are ready for the challenge, then join us on our exciting journey.

Responsibilities:

• Design, code and debug cloud-native applications.
• Evaluate and identify new technologies for implementation
• Determine operational feasibility by evaluating analysis, problem definition, requirements, solution development and proposed solutions
• Write well designed, testable, efficient code
• Develop software verification plans and quality assurance procedures
• Serve as a subject matter expert

• 5+ years of relevant experience in software development

• Deep understanding of public cloud infrastructure (AWS, Azure or Google)

• Experience with large scale distributed systems

• Ability to troubleshoot distributed systems

• Prior experience with data encryption, TLS/SSL is a strong plus

• Experience with Docker and Kubernetes is a plus

• Deep experience with Java

• Excellent communication (writing, conversation, presentation) skills, consensus building, Quick learner
  Good to have experience in Production support - Tier 4
  
  Experience with these technologies are a plus: AWS, Microsoft Azure, Google Cloud, Cloudera, Snowflake, Mongo DB, Oracle, Databricks, Datastax, Confluent