
š§ Ā Job Description: Senior Java Developer (8+ Years Experience)
Location:Ā Mumbai, India
Employment Type:Ā Full-time, Hybrid mode of working
Company:Ā Wissen Technology
Website:Ā www.wissen.com
š 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.
- š Offices in US, UK, India, Australia, Mexico, and Canada
- š„ 1700+ Wissen Technology professionals; part of a 4500-strong Wissen Group
- š Great Place to WorkĀ® Certified
- š§ Featured as a Top 20 AI/ML Vendor (CIO Insider, 2020)
- š Achieved 400% revenue growth in 5 years (with zero external funding)
- š¼ Delivered $1B+ worth of projects to 50+ Fortune 500 companies
Learn more about our work and thought leadership:
šĀ Articles by WissenĀ | š¼Ā LinkedIn
About the Role
We are seeking an experiencedĀ Senior Java DeveloperĀ with 8+ years of hands-on expertise in building scalable, high-performance applications. The ideal candidate will have strong fundamentals inĀ 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 usingĀ Core JavaĀ andĀ Spring frameworks
- Apply advancedĀ Object-Oriented Programming (OOPS)Ā principles to deliver clean, modular, and reusable code
- Implement and optimizeĀ multithreaded applicationsĀ for high-performance systems
- Work withĀ SQL databasesĀ 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
- Bachelorās/Masterās degree in Computer Science, Engineering, or related field
- 8+ years of professional experience inĀ Java development
- Strong expertise inĀ Core Java, OOPS, and Multithreading
- Hands-on experience withĀ Spring conceptsĀ (Spring Core, Spring MVC, Spring Boot preferred)
- Proficiency inĀ SQLĀ 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
š 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.

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 WorkĀ®. 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.
Connect with the team
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Responsibilities:
⢠Contribute to all phases of the development lifecycle
⢠Write well designed, testable, efficient code
⢠Prepare and produce releases of software components
⢠Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review ⢠Designing, implementing, and maintaining Java applications that are often high-volume and low-latency.
⢠Identify bottlenecks and bugs, and devise solutions to these problems
Skills: ⢠Expert hands on knowledge of latest technology, good exposure to web technologies and open to all technologies like Java, J2EE, Spring boot , Microservices, Cloud computing, any DB ⢠Very good exposure to DevOps concepts and tools, Continuous Integration and Continuous Delivery ⢠Quick learner, believes in continuous learning and acts as a catalyst for building the culture within the organization ⢠Analytical thinking skills, problems solving with strong exposure to root causing tools and techniques and ability to come up with solutions in complex situations.
⢠Solid understanding of object-oriented programming
⢠Familiar with various design and architectural patterns
⢠Skill for writing reusable Java libraries
⢠Experience with both external and embedded databases
⢠Understanding fundamental design principles behind a scalable application
⢠Proficient understanding of code versioning tools, such as Git
⢠Familiarity with build tools such as Ant, Maven, and Gradle ⢠Deep insight of Java and JEE internals such as memory management, transaction management, etc. ⢠Implementation of API. ⢠Problem solving skills, analytical mind, and a positive attitude. ⢠Experience with test-driven development. ⢠Experience in the Spring, Spring Boot, and Hibernate ⢠Knowledge of developing REST API. ⢠Results oriented and focused on meeting deliverable timelines. ⢠Good communication skills ⢠Problem-solving attitude ⢠Ability to establish priorities ⢠Teamwork and willingness to listen to others ⢠Eagerness to learn new ideas, concepts, and technologies. ⢠Understand Java EE Architecture
⢠Clear understanding of web services and SOA related standards like REST/OAuth/JSON ⢠Good knowledge of MicroServices. ⢠Expertise developing enterprise-level web applications and RESTful APIs using MicroServices, with demonstrable production-scale experience. ⢠Working experience in Industry Standard protocols related API Security ⢠Strong background working with Linux/UNIX environments. ⢠should have hands-on experience in developing software with agile or scrum methodologies and are ready to lead our junior developer's team.
SDE
Responsibilities
- Software Engineering
- Design and develop highly scalable, available, reliable, secure and fault tolerant systems with minimal guidance for a market leader in the logistics industry
- Partner with team members on functional and nonfunctional requirements and spread design philosophy, goals and improve the code quality across the team
- Research new technologies and tools that enable building the next generation of our services
- Provide technology leadership to the team and foster engineering excellence
- Product Delivery
- Partner with product managers to define and execute on the feature roadmap
- Translate business requirements into scalable and extensible design
- Coordinate with various cross functional teams on planning and execution
- Maintaining automated build / test / deployment environments
Ā
Qualifications
- Software Engineering
- Should have at least 3 years of hands-on experience in designing, developing, testing and deploying applications on Java, Ruby, Kotlin, Python, Node or Go for large scale applications
- Deep knowledge of one of the programming languages they have experience in
- Proficient in OOP and Design Patterns, experience with functional programming would be a plus
- Data modelling experience in Relational Databases
- Ability to design and implement low latency RESTful services
- Product Delivery
- Ability to scope, review and refine user stories for technical completeness and to alleviate dependency
- Well versed in working with agile methodologies which includes phases such as design, development, code review, testing and release management
- Ability to have worked in a CI/CD environment, with hands on experience with Git or any similar source code management tools
- Product Maintenance
- Experience troubleshooting server performance issues such as memory tuning, GC tuning, resource leaks
- Continuously refactor applications to ensure high quality design
Ā
About You
We are looking for passionate, enthusiastic, and proactive people that want to build their future with us, growing as we grow.
Dot Net candidate with a minimum of 4 years' experience, you are excited by the rare opportunity to work with the latest Microsoft technologies, rebuilding existing proprietary systems from the ground up.
You are a great communicator who makes a positive contribution working within a team to deliver excellent outcomes for Stake Holders.
If this, is you, come and join one of INDIAs fastest growing companies and enjoy both a flexible working environment and a great team culture.
Ā
Role/Core Competencies
- Familiarity with architecture styles And Expertise in Design Principles, Design Patterns, OOPS
- Solid knowledge of C#/.NET Framework knowledge,
- Hands on experience in .NET MVC, LINQ, AJAX, XML, Entity Framework Code First Approach
- Strong Experience in designing and developing the services using Web API.
- Experience in CSS, jQuery, Java Script, HTML5, Bootstrap
- Demonstrated ability to incorporate new technologies and techniques.
- Experience in working with Source Control System like TFS.
- Strong and effective inter-personal and communication skills (verbal and written).
- Knowledge of agile/scrum development processes.
- Working experience in Sql Server.
Ā
Responsibility includes:
- Participation in all stages of a project's SDLC including requirements gathering and documenting, high-level and low-level design, coding, testing, and deploying.
- Execute development tasks on projects and will test to guarantee the technical quality of the solution and handle security vulnerabilities.
- Transforms high-level statements of product feature into software design and implement it.
- Able to perform well in a team and as an individual and must have knowledge of SDLC process with documentation.
- Participation in all stages of a project's SDLC including requirements gathering and documenting, high-level and low-level design, coding, testing, and deploying.
- GUI and User Experience design and implementation in Web based applications with exposure to RESTful Service.
- On the need basis, estimates work efforts to support overall product planning & tracking activity.
- You will execute development tasks on projects and will test to guarantee the technical quality of the solution and handle security vulnerabilities.
Nice toĀ have
- Understanding of Agile
- If you are good in preparing test cases & executing test plans
Ā
RazerTech ConsultingĀ is mandated to hire a Technical Lead for a US based Tech Company that offers a cloud-based, AI?powered image editing and automation platform for leading brands in ecommerce, fashion, marketplaces & photo studios. The platform helps creatives and marketers produce stunningly consistent imagery and video content at scale.
Role Overview :
Were looking for a hands-on engineering lead to own the delivery of our GenAI-centric product from the backend up to the UI while integrating visual AI pipelines built by ML engineers. Youll be both a builder and a leader : writing clean Java and TypeScript/Node.js, scaling AWS-based systems, mentoring engineers, and making architectural decisions that stand the test of scale. Ideally, youre also familiar with Python for deploying ML pipelines.
(Note : This role requires both technical mastery and leadership skills - we're looking for someone who can write production code, make architectural decisions, and lead a team to success.)
What Youll Do :
- Lead development of the Java, Node.js and Python (FastAPI) backend services on AWS
- Build high-performance image processing pipelines using ImageMagick, SharpJS, and SVG manipulation
- Implement automated visual content generation using Headless Chrome and Puppeteer or similar tools.
- Deploy ML pipelines (built by the ML team) into containerized inference workflows using FastAPI, Docker, and GPU-enabled ECS EC2.
- Deploy and manage services on AWS ECS/Fargate, Lambda, API Gateway, and GPU-powered EC2
- Contribute to React/TypeScript frontend when needed to accelerate product delivery
- Work closely with the founder, product, and UX teams to translate business needs and PRDs into features that drive productmarket fit.
- Make architecture and infrastructure decisions from media processing to task queues to storage
- Own the performance and cost-optimization of our AWS platform
- Hire and mentor junior/mid engineers over time
- Drive technical planning, sprint prioritization, and trade-off decisions
Must have Skills :
- Backend Development (57 years) :Ā Java, Node.js, TypeScript, RESTful API, Docker
- AWS Expertise (5+ years) :Ā AWS Lambda, ECS, EC2, S3, DynamoDB, CloudWatch, IAM, roles
- Image Processing & Media Technologies :Ā ImageMagick, SharpJS, SVG manipulation and programmatic generation, Headless Chrome, Puppeteer
- System Optimization & Middleware (35 years) :Ā AWS cloud cost optimization, Celery, BullMQ, AWS Step Functions
- Frontend Development (23 years) :Ā React, TypeScript, Redux, Context API, CI/CD pipelines.
- System Design & Architecture (46 years) :Ā Event-driven architectures using queues, microservices-based systems, caching strategies (e.g., Redis, CDN edge caching)
- Leadership & Communication (23 years) :Ā Lead engineering teams and drive project delivery
Roles and responsibilities:
- Designing and implementing new features and functionality.
- Developing custom themes with WordPress by working with HTML, CSS, responsive frameworks, JavaScript, and ready-made theme development experience.
- Strong knowledge of Woo Commerce.
- Ensuring high-performance and availability, and managing all technical aspects of the CMS.
- Helping formulate an effective, responsive design and turning it into a working theme and plugin.
- HTML to WordPress Conversion.
- Should know versioning tools such as Git, Mercurial, or SVN.
Ā Required Candidate profile:
- Good Understanding of OOPs Programming concepts.
- Strong knowledge of JQuery, Bootstrap, PHP, JavaScript, CSS, HTML.
- Knowledge of HTML to WordPress.
- Knowledge of PSD to WordPress Integration.
- Knowledge of Individual and child page template development.
Ā

Preferred Skills:Ā
We want to really emphasize Spring Boot (2+ years although 1+ if candidate particularly strong) Using Redis as a caching technology with Spring Boot would be a strong plusĀ
Using Redisson (a particular java client library that can be easily configured with Spring Boot) would be a strong plusĀ
Knowledge of event based messaging systems (Amazon SNS, Amazon MQ, or Kafka (in AWS) Data Cleaning tools and techniques in CSV and ExcelĀ
Strong Knowledge of Spring Boot Dependency Injection and ConfigurationĀ
Experience with APIs for popular e-commerce platforms (Magento, Shopify, Big Commerce, etc.)Ā
SDLC (Software Development Lifecycle) Tools in the context of AWS. (Tools classified under DevOps)Ā
Experience with managing AWS EC2 VM instances and using AWS managed Services (like S3, MySQL, VPC/Networking, Lambda, etc)Ā
Performance Analysis Tools (Code Profiling) on Java VM and particularly Spring BootĀ
Experience in the development of Workflow or Business Process ApplicationsNice to Have:Ā
Experience with Cassandra or MongoDB with Spring BootĀ
Horizontal Scaling with Spring Boot (considerations running multiple instances of Spring Boot instances)Ā
Experience with placing Spring Boot applications in Docker/Kubernetes container ecosystems (especially in AWS)Ā
Search technologies such as Lucene/SolrAbout Dunzo
Not that long ago, we were on whatsapp with a handful of customers, many of whom were friends and family, getting you anything you needed - groceries, food, even sending packages to anywhere in Bangalore. Today, weāre an app covering Bangalore, Pune and Gurgaon, Hyderabad and Delhi. Dunzo is a technology company, that makes local deliveries fast and easy - whether itās that quick run from your local store, or getting you that book that is available only in one store far away from you or even organizing your entire party!
We were recently voted #3 on LinkedInās Top Startups in India and hereās why. The Dunzo team gets an on ground opportunity to shape a product for users across cities. You are shaping cities youāve grown up in - by making them more accessible than before through the use of technology. Weāre solving an extremely tough problem, and we seek the best of minds who are great at problem-solving, passionate and willing to go the extra mile!
About The Team
As a team, we believe that the best idea wins - no matter where the idea comes from. We tackle problems that have existed for years - through technology and data. You'll be joining a vibrant, young team who are passionate about giving our users time back, provide flexible earning opportunities for our Partners and enhance local businesses.
Job Description
Must Haves :
- Proficient in algorithms and data structures.
- Having strong experience in designing data intensive and scalable systems.
- Comfortable with microservices based architecture.
- Knowledge of software engineering processes and unit testing.
- Past experience of mentoring a team of at least two people.
- Prior experience with both relational and non-relational databases.
- Prior experience with caching.
- Ability to debug and hotfix a problem with production in a swift amount of time.
- Communication skills.
Please let me know if you are interested.
The Java/Backend Developer is responsible for the development and maintenance of Bytemarkās backend APIs. This person utilizes their knowledge of Java development & web technologies as an integral part of the software development team.
Responsibilities:
- Design, develop, maintain, and deliver highly scalable and reliable APIs
- Collaborate with development team and product owners to analyze, design, and implement user stories using an agile methodology.
- Write high-quality software code that complies with design specifications and meets development and support requirements.
- Develop unit tests and test changes using an agile methodology.
- Use a variety of tools to perform unit testing, automated builds, and source control.
- Participate as a member in Agile teams, and work with other team member to review user stories, estimate effort for user stories, and participate in sprint reviews.
- Maintaining current web and back-end features
- Learning new skills and technologies as company products and industry standards warrant
Required Skills:
- 2-6 years of experience building RESTful APIs
- 2+ year of hands-on Java experience using Play 1.x framework
- Knowledge of Spring or Grails frameworks is a plus
- Ability to write SQL.
- Understanding of OOP
- Experience with Test Driven Development (TDD) using JUnit, Selenium or a similar technology
- Basic knowledge of Unix
- Excellent verbal, written, and interpersonal communication skills
- 3-8 years of software development experience
- Undergraduate degree in the field of computer science or equivalent
- Able to handle multiple tasks in a fast paced environment





