Senior Software Engineer- Backend

Java Developer – Job Description Wissen Technology is now hiring for a Java Developer - Bangalore with hands-on experience in Core Java, algorithms, data structures, multithreading and SQL. We are solving complex technical problems in the industry and need talented software engineers to join our mission and be a part of a global software development team. A brilliant opportunity to become a part of a highly motivated and expert team which has made a mark as a high-end technical consulting. Required Skills: • Exp. - 4 to 7 years. • 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 client facing 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. About Wissen Technology: Wissen Technology is a niche global consulting and solutions company that brings unparalleled domain expertise in Banking and Finance, Telecom and Startups. Wissen Technology is a part of Wissen Group and was established in the year 2015. Wissen has offices in the US, India, UK, Australia, Mexico, and Canada, with best-in-class infrastructure and development facilities. Wissen has successfully delivered projects worth $1 Billion for more than 25 of the Fortune 500 companies. The Wissen Group overall includes more than 4000 highly skilled professionals. Wissen Technology provides exceptional value in mission critical projects for its clients, through thought leadership, ownership, and assured on-time deliveries that are always ‘first time right’. Our team consists of 1200+ highly skilled professionals, with leadership and senior management executives who have graduated from Ivy League Universities like Wharton, MIT, IITs, IIMs, and NITs and with rich work experience in some of the biggest companies in the world. Wissen Technology offers 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. We have been certified as a Great Place to Work® for two consecutive years (2020-2022) and voted as the Top 20 AI/ML vendor by CIO Insider. 

Job Responsibilities:

• Microservices Development: Contribute to the design, development, and testing of RESTful microservices using Java 14+, Spring Boot, and Spring Cloud.
• Cloud Integration: Assist in building and deploying services that integrate with AWS ecosystem services, including S3, SQS, SNS, API Gateway, ElasticSearch, and Secrets Manager.
• System Resilience: Help implement patterns for fault tolerance and latency tolerance using NetflixOSS tools such as Hystrix for circuit breaking and Ribbon for client-side load balancing.
• API Gateway & Service Discovery: Work with tools like Zuul for routing and filtering and implement service registration/discovery using Eureka.
• Security: Support the integration of authentication and authorization mechanisms using OAuth 2.0via Spring Cloud Security.
• Distributed Tracing: Utilize monitoring tools like Sleuth and Zipkin to help track requests across multiple services and diagnose performance bottlenecks.
• Asynchronous Messaging: Develop event-driven components using messaging platforms like Kafka and RabbitMQ.
• Code Quality & Collaboration: Write clean, maintainable, and well-tested code. Participate in code reviews, sprint planning, and other Agile ceremonies using tools like JIRA and Git.
• Collaboration: Work closely with cross-functional teams, including QE and DevOps, to ensure smooth deployment and operation of services.

Qualifications & Skills:

• 4 Years to 6 year of professional experience developing applications with Java.
• Hands-on academic or project experience with Spring Boot and an understanding of the Spring ecosystem (Spring Web, Spring Data JPA, Spring Core).
• Familiarity with building and consuming RESTful APIs.
• Basic understanding of microservices architecture principles.
• Exposure to cloud platforms, preferably AWS, and an interest in services like S3, SQS, or SNS.
• Knowledge of fundamental distributed systems concepts (caching, messaging, load balancing).
• Familiarity with version control systems, preferably Git.
• Strong problem-solving skills and a keen desire to learn new technologies.
• Excellent communication and teamwork skills.

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

Job Description:

As per our conversation, please find below the job description for your review. 

·       Strong written/verbal communication skills

·       Minimum 5-14 Years of Core Java Programming with Collections Framework, Concurrent Programming, Multi-threading (Good knowledge in Executor service, Forkjoin pool and other threading concepts)

·       Good knowledge of the JVM with an understanding of performance and memory optimization.

·       Extensive and expert programming experience in JAVA programming language (strong OO skills preferred).

·       Excellent knowledge on collections like, Array List, Vector, LinkedList, HashMap, Hash Table, HashSet is mandate.

·       Exercised exemplary development practices including design specification, coding standards, unit testing, and code-reviews.

·       Expert level understanding of Object-Oriented Concepts and Data Structures

·       Good experience in Database (Sybase, Oracle, or SQL Server) like indexing (clustered, non clustered), hashing, segmenting, data types like clob / blob, views (materialized), replication, constraints, functions, triggers, procedures etc.

·       While you may already know about Wissen and the company history, here is a quick rundown for you.

Requirements:

• Experience in Frameworks: YII
• Must have good analytical and problem solving skills.
• Good Knowledge of OOPS.
• Write error free code and follow coding standards. Able to perform Code Review job.
• Work closely with QA person to assist in the testing process. 
• Perform R&D tasks if assigned and communicate with the Designer and UI team.
• Build reusable code and libraries for future use.
• Able to work closely with the team and meet the tight deadlines where necessary.
• Strong Communication Skills.

We are looking for a skilled and experienced Node.js Developer with at least 4 years of professional experience to join our team. As a Node.js Developer, you will be responsible for developing robust and scalable web applications using JavaScript and various frameworks.

Roles and Responsibilities

• Production platform hands-on experience involving Node JS & REST API.

• Hands-on production platform experience working with micro-service back-end architecture.

• Working knowledge of GRPC, HTTPS, and GRAPHQ protocols.

• Well-versed in cloud deployment of code blocks.

• Experience with JS testing and code analysis frameworks such as Mocha.

• Utilize modern JavaScript frameworks such as Express.js and Sails.js to build efficient and scalable applications.

• Work with databases like MongoDB and PostgreSQL using Mongoose and Sequelize ORM.

• Integrate messaging systems like Kafka and RabbitMQ for reliable event-driven communication.

• Write unit tests using Mocha, Chai, and Jest frameworks to ensure code quality and reliability.

• Utilize AWS S3 bucket for secure and scalable storage of data and media files.

• Collaborate with QA engineers to perform thorough testing and bug fixes.

• Work with third-party APIs such as Postman, Twilio, SendGrid, Firebase, and KeyCloak for various integrations.

Job Description

·       Strong Core Java / C++ experience with Strong Handson Coding

·       Excellent understanding of Logical ,Object-oriented design patterns, algorithms and data structures.

·       Sound knowledge of application access methods including authentication mechanisms, API quota limits, as well as different endpoint REST, Java etc

·       Strong exp in databases - not just a SQL Programmer but with knowledge of DB internals

·       Sound knowledge of Cloud database available as service is plus (RDS, CloudSQL, Google BigQuery, Snowflake )

·       Experience working in any cloud environment and microservices based architecture utilizing GCP, Kubernetes, Docker, CircleCI, Azure or similar technologies

Responsibilities for NodeJS Dev

Integration of user-facing elements developed by front-end developers with server side logic.

Writing reusable, testable, and efficient code.

Design and implementation of low-latency, high-availability, and performant applications.

Implementation of security and data protection.

Integration of data storage solutions redis, mongodb.

Skill Requirement:

Strong proficiency with JavaScript or TypeScript.

Strong Knowledge of Node.js and frameworks available for it such as Express, StrongLoop.

Understanding the nature of asynchronous programming and its quirks and workarounds.

Good understanding of server-side templating languages.

Good understanding of server-side CSS preprocessors such as Stylus, Less.

Basic understanding of front-end technologies, such as HTML5, and CSS3.

Understanding accessibility and security compliance.

User authentication and authorization between multiple systems, servers, and environments.

Integration of multiple data sources and databases into one system.

Understanding fundamental design principles behind a scalable application.

Understanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platform.

Creating database schemas that represent and support business processes.

Implementing automated testing platforms and unit tests.

Proficient understanding of code versioning tools, such as Git.

Collaborate with clients and internal teams to develop appropriate solutions

• Brainstorm with team members and prove the ability to think on the fly.

Requirements

• Core Java

• Spring Boot, Spring Rest, Spring Data

• Testing framework - Junit, Mockito

• Experience in deploying applications on one of public cloud preferably Microsoft Azure. (Other

- AWS or Google Cloud)

• Experience in one of messaging platform preferably Kafka (Other - Rabbitmq or Active MQ)

• Docker

• Kubernetes

• Others – Linux, Git, Maven, CI/CD pipeline

• Experience in working with Agile teams

Good To Have

• Git (6+ years of experience)

• Develop test cases, conduct SIT, load test, and tune the performance of systems to meet

acceptance criteria.

• Perform and manage stages of the SCRUM and participate in the systems review with Project

Lead/Manager.

• Experience in the development of cloud-native applications is an added advantage.

• Experience working in Agile teams

What We Offer

• National and International Business Trips (if there is an opportunity)

• Culture of Knowledge Sharing and Training

• Modern & lively working environment

• Opportunity to write books, participate in conferences

• International assignment