
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.

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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Strong MERN / Frontend Developer Profile
Mandatory (Experience 1): Must have 2+ years of hands-on experience in software development using MERN stack (MongoDB, Express.js, React.js, Node.js)
Mandatory (Experience 2): Must have 1+ years of frontend development experience with React.js, HTML5, CSS3, JavaScript (ES6+);
Mandatory (Experience 3): Must have experience with Next.js (SSR/SSG, API routes, Server Actions)
Mandatory (Experience 4): Hands-on experience in building RESTful APIs using Node.js and Express.js
Mandatory (Experience 5): Experience writing unit test cases using Mocha, Chai, Jest (or similar), and working in Agile/Scrum environments
Preferred
Preferred (Experience) – Exposure to GCP/AWS/DevOps and cloud-native development
Preferred (Educataion) – B.E /B.Tech /BCA
Role : Java Developer (2-7 years)
Location : Bangalore
Key responsibilities
- Develop and maintain high-quality, efficient, and scalable backend applications.
- Participate in all phases of the software development lifecycle (SDLC)
- Write clean, well-documented, and testable code adhering to best practices.
- Collaborate with team members to ensure the successful delivery of projects.
- Debug and troubleshoot complex technical problems.
- Identify and implement performance optimizations.
- Participate in code reviews
- Hands-on experience with Spring boot, Java 8 and above.
- 2-7 years of experience developing Java applications.
- Knowledge about at least one messaging system like Kafka, RabbitMQ etc.
- Required React developer requirements, qualifications & skills:
- Proficiency in React.js and its core principles
- Strong JavaScript, HTML5, and CSS3 skills
- Experience with popular React.js workflows (such as Redux)
- Strong understanding of object-oriented programming (OOP) principles.
- Experience with design patterns and best practices for Java development.
- Proficient in unit testing frameworks (e.g., JUnit).
- Experience with build automation tools (e.g., Maven, Gradle).
- Experience with version control systems (e.g., Git).
- Experience with one of these databases – Postgres, MongoDb, Cassandra
- Knowledge on Retail or OMS is a plus.
- Experienced in containerized deployments using Docker, Kubernetes and DevOps mindset
- Ability to reverse engineer existing/legacy and document findings on confluence.
- Create automated tests for unit, integration, regression, performance, and functional testing, to meet established expectations and acceptance criteria.
Senior Software Engineer.
- A degree in Data Science, Artificial Intelligence, Computer Science, or a related field
- Strong proficiency in Python, with a solid understanding of object-oriented programming principles.
- Proven experience in developing applications powered by Large Language Models (LLMs).
- Demonstrated experience in building and maintaining robust ETL (Extract, Transform, Load) data pipelines.
- Ability to build full-stack applications using JavaScript; experience with modern frameworks like React and Next.js is highly desirable.
- A pragmatic and self-starting individual, capable of executing tasks effectively with minimal supervision.
- Experience developing modern frontend applications, with specific expertise in using Web Components.
- Knowledge of simulation principles and discrete optimisation techniques.
- Relevant professional certifications in AI, Machine Learning, or cloud platforms are a plus.
Experience
- Proven track record building AI (e.g. LLM-powered solutions, Agent-Based Applications), data science, or numerical computing projects end-to-end—from initial concept through to deployment and maintenance.
- Extensive hands-on experience (4+ years) with core technologies, including:
- Advanced Python, utilising libraries such as NumPy, Pandas, and frameworks for multiprocessing and asynchronous programming.
- Relational database management systems.
- Development and deployment within Linux environments.
- Collaborative development workflows using Git.
● You can rock with your expertise in fundamental front end languages such as HTML, CSS and JavaScript.
● You can make value additions aided by your familiarity with advanced JavaScript libraries and frameworks such as React.
● You have top notch ability of server side languages such as NodeJS, Web Services, Micro service.
● Database technology such as MySQL also falls in your comfort zone.
● You can enhance our world with your Cloud Experience preferably AWS [EC2, RDS, S3, Lambda] or OCI
● You take pride in your knowledge of code versioning tools such as Git
● Third party integration like payment gateway and any Plugins
● Familiar with third party libraries like D3 Chart, Video and Audio player.
● Development experience with webcam based recording or streaming
● WebRTC protocol with any Media Server
● React with Next.JS framework
● JWT, OAuth, JSON web token, Node mailer
● Experience with WebRTC, RTSP and other streaming applications
● Good at cron Jobs development and configuration
Responsibilities:
● You’ll develop high quality front end architecture.
● You’ll build solid back-end web services/micro services
● You’ll design and develop APIs and API documentation
● You’ll help the team in designing and normalizing databases
● You’ll ensure cross-platform optimization for web and mobile phones.
● You’ll proactively ensure responsiveness of applications
About Kloud9:
Kloud9 exists with the sole purpose of providing cloud expertise to the retail industry. Our team of cloud architects, engineers and developers help retailers launch a successful cloud initiative so you can quickly realise the benefits of cloud technology. Our standardised, proven cloud adoption methodologies reduce the cloud adoption time and effort so you can directly benefit from lower migration costs.
Kloud9 was founded with the vision of bridging the gap between E-commerce and cloud. The E-commerce of any industry is limiting and poses a huge challenge in terms of the finances spent on physical data structures.
At Kloud9, we know migrating to the cloud is the single most significant technology shift your company faces today. We are your trusted advisors in transformation and are determined to build a deep partnership along the way. Our cloud and retail experts will ease your transition to the cloud.
Our sole focus is to provide cloud expertise to retail industry giving our clients the empowerment that will take their business to the next level. Our team of proficient architects, engineers and developers have been designing, building and implementing solutions for retailers for an average of more than 20 years.
We are a cloud vendor that is both platform and technology independent. Our vendor independence not just provides us with a unique perspective into the cloud market but also ensures that we deliver the cloud solutions available that best meet our clients' requirements.
What we are looking for:
● Overall 8+ Years of Experience in Web Application development.
● 5+ Years of development experience with JAVA8 , Springboot, Microservices and middleware
● 3+ Years of Designing Middleware using Node JS platform.
● Good to have 2+ Years of Experience in using NodeJS along with AWS Serverless platform.
● Good Experience with Javascript / TypeScript, Event Loops, ExpressJS, GraphQL, SQL DB (MySQLDB), NoSQL DB(MongoDB) and YAML templates.
● Good Experience with TDD Driven Development and Automated Unit Testing.
● Good Experience with exposing and consuming Rest APIs in Java 8, Springboot platform and Swagger API contracts.
● Good Experience in building NodeJS middleware performing Transformations, Routing, Aggregation, Orchestration and
Authentication(JWT/OAUTH).
● Experience supporting and working with cross-functional teams in a dynamic environment.
● Experience working in Agile Scrum Methodology.
● Very good Problem-Solving Skills.
● Very good learner and passion for technology.
● Excellent verbal and written communication skills in English
● Ability to communicate effectively with team members and business stakeholders
Why Explore a Career at Kloud9:
With job opportunities in prime locations of US, London, Poland and Bengaluru, we help build your career paths in cutting edge technologies of AI, Machine Learning and Data Science. Be part of an inclusive and diverse workforce that's changing the face of retail technology with their creativity and innovative solutions. Our vested interest in our employees translates to delivering the best products and solutions to our customers.
What you will do
- Develop high-quality software based on the technical design provided by team lead
- Adherence with software development processes. Demonstrate problem solving skills, and attention to quality and detail
- Perform code reviews and unit testing, validation, and verification testing of program modules
- Develop well managed, high quality, scalable and reusable code using .NET components, web service API’s, database procedures, JavaScript, etc.
- Build automation pipeline (CI/CD) through appropriate tools and scripting
- Debug code, solve incidents and defects. Document unit test plans.
- Adhere toOWASP security standards while coding and regulatory requirements
Who you are
- Experienced Software Developer with 1 to 3 years of total IT experience.
- At least 2 years of development experience with Microsoft technology stack (.Net)
- Good knowledge of software development, agile methodologies, and the following technologies:
C#, http://asp.net/">ASP.NET Core, Web API, HTML/CSS, MVC, WCF, JavaScript, Oracle/SQL Server,AngularJS/ReactJS, Apache Kafka, Mule ESB, Apache Spark, PowerBI, Azure DevOps
- Experience developing highly responsive web and mobile applications (UI/UX) using HTML5/CSS3, W3.CSS, Bootstrap, JavaScript, XML, Xamarin, etc.
- Familiarity with various operating systems (Linux, Mac OS, Windows)
- Hands-on experience in software development and agile methodologies
- Proficiency in relational databases like SQL Server and Oracle. Knowledge of cloud technologies (AWS, Azure, Google cloud), container and virtualization will be a big plus.
- Familiarity with Continuous integration (Azure DevOps/Jenkins/Hudson) and version control (GitHub, SVN). Knowledge of modern frameworks and design patterns, and test automation tools for Unit and Performance testing.
- Experience creating secure RESTful web services in XML and JSON
Required Skills:
- .NET Core
- C#
- Web API
- Aware of Microservice concepts
- MongoDB
- Excellent communication
Docker, Kubernetes, and Linux knowledge is desirable. Having worked in a product development environment is desirable. Having worked in the finance and banking domain is desirable.
As a Full Stack Developer, you should be comfortable around both front-end and back-end coding languages, development frameworks, and third-party libraries. You should also be a team player with a knack for visual design and utility.
If you’re also familiar with Agile methodologies, we’d like to meet you.
Responsibilities:
- Work with development teams and product managers to ideate software solutions
- Design client-side and server-side architecture
- Build the front-end of applications through appealing visual design
- Develop and manage well-functioning databases and applications
- Write effective APIs
- Test software to ensure responsiveness and efficiency
- Troubleshoot, debug and upgrade software
- Create security and data protection settings
- Build features and applications with a mobile responsive design
- Write technical documentation
- Work with data scientists and analysts to improve software
- Proven experience as a Full Stack Developer or similar role
- Experience developing desktop and mobile applications
- Familiarity with common stacks
- Knowledge of multiple front-end languages and libraries (e.g. HTML/ CSS, JavaScript)
- Knowledge of multiple back-end languages (e.g. Javascript, PHP, WordPress) and JavaScript frameworks (e.g. Angular, React, Node.js)
- Familiarity with databases (e.g. MySQL, MongoDB), web servers (e.g. Apache)
- Excellent communication and teamwork skills
- Great attention to detail
- Organizational skills
- An analytical mind
- Degree in Computer Science, Statistics or relevant field
Overview
Xcelpros is a Global company, headquartered in Chicago (US) with multiple locations in US and Bengaluru, India. Our focus is Tech Innovation, Product Development and Technology Consulting.
We are hiring for our Product Development team and have an immediate need for a Backend Developer / Fullstack MERN Developer. The position calls for someone with a mindset who can build great products, manage multiple projects and related tasks on deadline. We are looking for high-quality and passionate developers that want to be a part of a great product team.
You need to have at least 2 years of demonstrated experience as a Backend Developer using MERN (NodeJS, MongoDB, PostgreSQL & Express) & GraphQL technologies. The candidate will work closely with our internal teams in the design, development, launch and enhancement of various products.
About XcelPros
XcelPros is a Global company, headquartered in Chicago (US) with multiple locations in US and Bengaluru, India. XcelPros is focused on Tech Innovation, Product Development and Technology Consulting.
XcelPros specializes in technology solutions for Business-to-Business (B2B) and Business-to-Consumer (B2C) areas. We believe technology is the enabler of exponential growth for us and our customers. We are strategists delivering innovative business and technology solutions. We have been well funded and operational since 2011.
XcelPros and affiliated group of companies are proud to foster a high-performance culture, one that's defined by having the best people, with the skills and determination to deliver above and beyond. We look for insightful and astute professionals who are also forward-thinking, confident, self-motivated and globally minded. Our core team consists of professionals with a wide range of skills and backgrounds. XcelPros is continuously looking for talented, highly motivated individuals who believe in excellence and are committed to providing superior service to our customers and stakeholders.
Experience
- Minimum of 2 years of experience in the design and development of Web and Mobile applications using NodeJS, MongoDB, PostgreSQL, Apollo - GraphQL and React
- You are required to have experience with development in Microservices Architecture
- Experience with NestJS framework is a major plus
- Hands on experience with GoLang is not mandatory but a major plus
Start Date - Immediate
Positions - 2 (Immediate Need)
Responsibilities
- Minimum of 2 years of hands-on experience building applications in NodeJS, MongoDB, PostgreSQL, Apollo - GraphQL and React
- Strong and mandatory experience of 2 years of experience in building applications using the Microservices architecture in NodeJS
- Strong and mandatory skills in Automating Components, Perceptibility, Configuration Management, Debugging & Consistency while writing Microservices.
- Experience building applications using NestJS or similar frameworks is a major plus
- Experience building applications and service integrations using Apollo / GraphQL
- Adhere to best practices of engineering by writing high-quality code.
- Hands on experience in Elastic Search and related technologies
- Hands on experience with one or more testing frameworks such as Jest
- You are required to write / conduct unit & integration testing to ensure code meets high-quality standards
- Collaborate with multiple stakeholders, including Production Support, BAs, Architect, Project Managers, and Product Owners to deliver high quality solutions.
- Develop, build, configure and unit test solutions from low level designs
- Ensure that solutions meet requirements outlined in the design documentation
- Perform all work to agreed time, cost and quality constraints
- Ensure that developed solutions are peer reviewed and formally documented
- Design, develop, test and document detailed technical specifications for application components built using MERN (MongoDB, ExpressJS, ReactJS, NodeJS) stack and integrations
- Develop and maintain high traffic / high performance React and Node based e-commerce web applications and web services, including support for mobile
- Participate in support activities to help UI developers integrate with APIs / services
- Create and maintain scalable infrastructure leveraging modern AWS cloud platforms
- Knowledge of all development aspects within an Agile SDLC framework, including; estimation, design, development, unit test, code reviews, and documentation
- Develop solutions that satisfy business requirements as outlined in user stories, and within agreed upon timelines
- Ensure solutions are of high-quality with regards to following standards and best practices, as well as satisfying security and performance requirements
- Collaborate effectively with other Agile team members
- Work with the Production Support team in the research and resolution of production issues.
- Prior hands-on experience with architecture for Web and Mobile technologies, E-commerce, Payment Gateways, Data security and encryption is a major plus
- Experience with CICD, containers and container management platforms(Dockers, Docker Swarm/Kubernetes, etc.)
- Knowledge of GOLANG is a major plus
- Good understanding of the Twelve-factor App methodology is a major plus
- Experience defining new architectures and ability to drive project from an architecture standpoint is a major plus
- Experience with Security configuration is a major plus
- Experience in understanding platforms & key AWS services like Elastic Beanstalk, AWS Lambda, ECS, AWS Fargate, EKS, EC2, S3 etc. is a major plus
- Troubleshoot and resolve complex technical issues in cloud integrations
- Highest levels of code quality
- Needs to conduct weekly code reviews
- Ensure timely and quality release of the product in collaboration with other team members
- Must be a self-starter and able to build up presence in the team.
- Perform other related duties as assigned
Technical Expertise / Hands-On Skills:
- MERN (MongoDB, ExpressJS & Node JS)
- PostGreSQL
- Apollo GraphQL
- JEST
- RESTAPIs
Key Deliverables
- Develop very high sense of ownership, the zeal to build scalable applications
- Develop a deep understanding of product development and start-up ecosystem
- Work with a performance oriented team driven by ownership and open to experiments
- Build customer facing technology product for global customers
- Collaborate with development teams to help identify and develop reusable platforms/libraries.
Key Requirements
- Can do attitude
- Highly motivated to bring fresh thoughts to the table
- Highly creative and most importantly willing to exercise it
- Self-starter and self-learner focused on research and learning
- Ability to play a variety of roles and most importantly take accountability
- Ability to communicate openly and embrace various perspectives without judgment
- Believe in a ”No politics” attitude. Politics can be detrimental to yourself and the organization.











