Senior Java Developer

JOB DESCRIPTION

Experience: 3-8 years

Location- Mumbai

Wissen Technology is now hiring for a Java Developer - Mumbai 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. - 3-8 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.

Locations: Bangalore & Mumbai

⏳ Experience: 3–15 Years

⚡ Notice Period: Immediate Joiners or Max 10 Days

Mandatory Skills:

✅ Strong Core Java

✅ Excellent Problem-Solving Skills

✅ Data Structures & Algorithms

✅ AI / LLM Knowledge

✅ Strong Coding Skills

Important:

Candidates must be available for a Face-to-Face Interview in Bangalore or Mumbai.

Only Immediate Joiners or candidates serving up to 10 days' notice period will be considered.

Job description

🔧 Key Responsibilities:

• Design and implement robust backend services using Node.js.
• Develop and maintain RESTful APIs to support front-end applications and third-party integrations
• Manage and optimize SQL/NoSQL databases (e.g., PostgreSQL, MongoDB, Snowflake)
• Collaborate with front-end developers to ensure seamless integration and data flow
• Implement caching, logging, and monitoring strategies for performance and reliability
• Ensure application security, scalability, and maintainability
• Participate in code reviews, architecture discussions, and agile ceremonies

✅ Required Skills:

• Proficiency in backend programming languages (Node.js, Java, .NET Core)
• Experience with API development and tools like Postman, Swagger
• Strong understanding of database design and query optimization
• Familiarity with microservices architecture and containerization (Docker, Kubernetes)
• Knowledge of cloud platforms (Azure, AWS) and CI/CD pipelines.

Responsibilities

• Preferred 1-3 years experience as Laravel Developer.
• Proven experience using PHP framework Laravel
• Troubleshooting issues in the implementation and debug builds.
• Writing server-side web application logic, back-end components, connect the application with other web services & support the front-end developers.
• Ability to perform UI/backend tests to optimize performance.
• Guide and Mentor other developers
• Hands-on experience in building and integrating API.
• Hands on experience in backend and frontend technologies.

Requirements:

• A degree in programming, computer science, or a related field.
• Excellent knowledge of PHP MVC architecture and OOP programming style.
• Proficiency in HTML and JavaScript.
• Knowledge of database design and querying using SQL.
• Practical experience using the MVC architecture.
• A portfolio of applications and programs to your name preferred.
• Must be able to fix bugs and errors and develop scalable apps
• Problem-solving skills and critical mind set.
• Ability to lead teams.
• Ability to work individually and handle clients.

Key Responsibilities:

• Rewrite existing APIs in NodeJS.
• Remodel the APIs into Micro services-based architecture.
• Implement a caching layer wherever possible.
• Optimize the API for high performance and scalability.
• Write unit tests for API Testing.
• Automate the code testing and deployment process.

Skills Required:

• At least 2.5 years of experience developing Backends using NodeJS — should be well versed with its asynchronous nature & event loop, and know its quirks and workarounds.
• Excellent hands-on experience using MySQL or any other SQL Database.
• Good knowledge of MongoDB or any other NoSQL Database.
• Good knowledge of Redis, its data types, and their use cases.
• Experience with graph-based databases like GraphQL and Neo4j.
• Experience developing and deploying REST APIs.
• Good knowledge of Unit Testing and available Test Frameworks.
• Good understanding of advanced JS libraries and frameworks.
• Experience with Web sockets, Service Workers, and Web Push Notifications.
• Familiar with NodeJS profiling tools.
• Proficient understanding of code versioning tools such as Git.
• Good knowledge of creating and maintaining DevOps infrastructure on cloud platforms.
• Should be a fast learner and a go-getter — without any fear of trying out new things Preferences.
• Experience building a large-scale social or location-based app.

Responsibilities:

• Take on complex problems that span multiple components and teams.

• Independently own one or more multiple modules, which include: requirement analysis, design, development, maintenance & support

• Write extensive, efficient code to address complex modules that handle the interaction between multiple components.

• Rapidly iterate to add new functionalities and solves complex problems with simple and intuitive solutions

• Produce architecture with clean interfaces, that are efficient and scalable

• Participate and contribute to architectural discussions

• Solve production issues. Investigate and provide solutions to minimize the business impact due to the outage

• Continuously improve performance metrics of modules you own.

• Collaborate effectively across teams to solve problems, execute and deliver results

Requirements:

• Experience: 3+ years

• A Bachelor's or Master's Degree in Computer Science

• Software engineering and product delivery experience, with a strong background in algorithms

• Experience in architecting & building real-time, large-scale e-commerce applications

• Experience with high-performance websites catering to millions of daily traffic is a plus

• Excellent command over Data Structures and Algorithms

• Experience with web technologies, Go/Java/Python

• Language: GO or Python

• Strong expertise in DS and Algo

• Strong leadership skills - have experience mentoring, building products from scratch or incumbent in design and architecture.

• Have worked in the scaling of the system right from scratch.

• Someone worked in small user base to a large user base and wrote optimized code

• Both HLD and LLD

• Work with business analysts to estimate and design effective, scalable and maintainable solutions that meet business initiatives and objectives
• Develop and unit test software that meets business requirements and technical design
• Troubleshoot pre- and post-production implementations
• Propose new ideas when there is strong business value and stay up to date on the latest technology trends and techniques

Critical Skills & Experiences:

• At least 5+ years of experience developing in Java technologies with equivalent experience in systems analysis, OO design, OO programming and debugging skills
• At least 5 years of experience in Java Spring Boot Framework development
• 2 years of experience in any Cloud platform, preferably AWS.
• At least 3 years of web services and relational database experience (preferably Mysql)
• At least a year of Elastic search experience
• Experience developing RESTful web services (preferably micro services)
• Experience with UNIX/Linux command line and shell scripting
• Experience working in cross-functional Agile/Scrum teams
• Any level of experience with JIRA or any other issue tracking technology
• Experience working directly with business stakeholders
• Experience with Java application profiling and profiling tools
• Exceptional written and verbal communication skills.
• Drive performance to accomplish team goals in a fast-paced environment
• Bachelor’s degree or the above equivalent skills and years of experience

Keywords:

Experience: +5 Years

Technical skills: Java, Spring boot and Node JS  

Objective of the Role:
We are here to build a world-class tech organization with elite engineers and change-agents who would spearhead this change. Currently, we are looking for engineers who are skilled, passionate, driven and a wee bit crazy (yes, crazy works!) to join our tribe. The current position is for the supply chain teams and our primary focus is on scale and cost optimization. The small tweaks you make, the processes you alter, experiments you run and the business decisions you drive will have reverberating effects on our ability to add value to our customers and keep them coming back for more.

Role & Responsibilities

• Design and build the system which enables the logistics team to store and deliver 15 million products per month to customers across 20 cities in India
• Work on the vision, roadmap, and processes that make customer delivery experience more delightful
• Work across teams to design a platform that scales and is flexible enough for various kinds of future scenarios
• Work on optimizing the whole logistics supply chain from warehouse to customer
• Innovate to improve the efficiency of the existing supply chain systems
  Desired skills & abilities:
• 3-6 years of experience in software development
• B.Tech. / B.E. degree in Computer Science or equivalent software engineering degree/experience
• Experience in architecture and system design 2Experience in running high performance distributed systems
• Understanding and implementation of security and data
• Highly experienced in back-end programming languages like Python, Java, JavaScript
• Experience with cloud message APIs and usage of push
• Knowledge of code versioning tools such as Git, Mercurial or SVN
• Solid experience in software development practices
• Ability to mentor and manage teams
• Exposure to Agile/Scrum and Design thinking approaches
  
  
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