
- Contribute to all stages of software development lifecycle
- Design, implement and maintain Java-based applications that can be high-volume and low-latency
- Analyze user requirements to define business objectives
- Envisioning system features and functionality
- Define application objectives and functionality
- Ensure application designs conform with business goals
- Develop and test software
- Identify and resolve any technical issues arising
- Create detailed design documentation
- Propose changes to current Java infrastructure
- Develop technical designs for application development
- Develop multimedia applications
- Write well designed, testable code
- Conducting software analysis, programming, testing, and debugging
- Manage Java and Java EE application development
- Develop documentation to help users
- Transforming requirements into stipulations
- Prepare and produce releases of software components
- Support continuous improvement, investigating alternatives and technologies, and presenting for architectural review

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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:
- Experience - 4+ 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.
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.
Job Description:
We are looking for a Software Engineer with solid development experience in Java and related frameworks. We are looking for a self-motivated, go-getter, out-of-the-box thinker who is ready to work in a high-energy start-up environment. He/she must demonstrate a high level of ownership, integrity, and creativity.
Required Skills:
• Core Java (Proficient)
• Spring, Spring MVC OR Spring boot
• Hibernate – Good to have
• Oracle/MySQL DB - Hands-on (Intermediate)
• REST API and AWS– Good to have
• Hands-on experience of working on Spring boot based Microservices (Intermediate)
• Good to have knowledge of Microservice DevOps tools (Git, Jenkins, JUnits, deployment, monitoring, tracing)
• Sound understanding of core Java, SOAP Services, REST Services, Spring & maven, having expertized to work on Unix platform
• Should have working knowledge on web servers (e.g. Apache HTTP) and application servers (e.g. Tomcat, WebLogic)
• Should have a working knowledge of any relational database. Preferred will be Oracle and MySQL.
Roles and Responsibilities:
• You will design, develop, modify, debug and/or maintain software code according to functional, non-functional and technical design specifications.
• You will follow software engineering standards, applicable software development
methodology and release processes, to ensure code is maintainable, scalable,
supportable and demo the software products to stakeholders
• You will investigate issues by reviewing/debugging code, providing fixes and workarounds, and reviewing changes for operability to maintain existing software solutions.
• You will work within a team, collaborate and add value through participation in peer code reviews, provide comments and suggestions, work with cross-functional teams to achieve goals.
Why should you join Opcito?
We are a dynamic company that believes in designing transformation solutions for our customers with our ability to unify quality, reliability, and cost-effectiveness at any scale. Our core work culture focuses on adding material value to client products by leveraging best practices in DevOps like continuous integration, continuous delivery, and automation, coupled with disruptive technologies like cloud, containers, serverless computing, and microservice-based architectures.
Here are some of the perks of working with Opcito:
• Outstanding career development and learning opportunities
• Competitive compensation depending on experience and skill
• Friendly team and enjoyable work environment
• Flexible working schedule
• Corporate and social events.
• B. E. /B. Tech. in Computer Science or MCA from a reputed university.
• 3.5 plus years of experience in software development, with emphasis on JAVA/J2EE Server side
programming.
• Hands on experience in core Java, multithreading, RMI, socket programing, JDBC, NIO, webservices
and design patterns.
• Knowledge of distributed system, distributed caching, messaging frameworks, ESB etc.
• Experience in Linux operating system and PostgreSQL/MySQL/MongoDB/Cassandra database.
• Additionally, knowledge of HBase, Hadoop and Hive is desirable.
• Familiarity with message queue systems and AMQP and Kafka is desirable.
• Experience as a participant in agile methodologies.
• Excellent written and verbal communication skills and presentation skills.
• This is not a fullstack requirement, we are looking for a purely backend expert.
We are seeking extremely smart programmers who are gung ho about building large scale systems that are going to have a big impact on millions of customers.
Responsibilities:
- Design and develop products by working closely with business team.
- Gain experience with hands on coding and independent ownership of software components.
- Build performant, scalable, enterprise ready back end architectures that can support millions of users in parallel.
- Follow strong engineering best practices and champion their adoption.
Requirements:
- 2+ years’ experience in software product development and delivery.
- Bachelors or Masters degree in engineering from a reputed institute(preferably IITs, NITs, or other top engineering institutes).
- Strong grasp of CS fundamentals, algorithms and excellent problem solving abilities.
- All experience should be from good product development or e-commerce background.
- Must have shown good stability in all your previous associations.
- Have strong backend knowledge and cloud development exposure.
- Expert at Java, Spring boot, Hibernate, REST API development.
- Worked with at least 1 RDBMS (Mysql preferred). NoSql is a plus.
- Have used or are very hands-on with Microservices, Docker, Kubernetes, Gradle/Ant, Kafka, GIT/bitbucket in a very agile work place.
- Writing high quality code which is made better by unit tests and integration tests is how you work.
- Comfortable with exploring proven open source tech stack like Grafana, Kibana, Jira, Prometheus, caches like Redis/Memcached, task queues like celery, to name a few.
- Knowledge of test driven development and AWS tech stack will be a good plus.
Java
Mandatory:
- Strong expertize in Java/J2EE(4-7 years of experience)
- Strong expertize in Microservices, SpringBoot
- Java including multithreading and concurrency
Preferred skills :
- Experience in Virtualization, SDN, NFV, Yang, Netconf
- Good Knowledge on Networking
- Multithreading and concurrency
We are looking to hire Java developers who can help us in our mission to transform ideas into applications. Our cross-functional team of motivated, skilled and experienced software engineers and designers, help the clients unlock the business values of their enterprises in a time-bound and cost-effective manner. True to our team you would be working on high-impact projects and making a dent in the Service industry on a daily basis.
Skills :
- Excellent Communication Skills
- 4-6 years of experience in Java8 Development.
- V yAPI, Spring Boot/MVC, Spring Security
- Hibernate, JPA, MySQL/POSTGRES, Jenkins, Git
- Experience of developing high-performance and scalable web applications and APIs using frameworks such as Spring Boot/MVC, Spring Security, Hibernate, and JPA.
- Hands-on Experience of Version control(Git), MYSQL/POSTGRES, Jenkins, etc.

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1. POSITION DESCRIPTION |
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Job Title: |
Switch Developer/ Integration/ Java Developer |
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Job Type: |
Permanent | Work from Home |
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Qualifications: |
Bachelor’s degree of Engineering, Computer Science or relevant field |
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2. JOB DIMENSIONS: |
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Experience |
3-7 years |
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Primary Skills |
Core Java, Spring Boot, MySQL, Oracle, REST APIs, knowledge of card scheme specifications, ISO8583 Payment standards, EMV Data, Switch payment integration |
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Job Location |
Mumbai/Bangalore | open to remote work |
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3. REQUIREMENTS: |
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· Looking for a Switch developer with 3-7 years of hands on working experience with minimum of 3-4 years in Card and Payment Domain. · Strong knowledge of core java & spring boot · Hands-on experience on payment switch integration · Good knowledge of ISO8583 and EMV Data. · Hands-on experience on any database like MySQL, oracle...etc. · Should be strong in creating/ defining Swagger specs for REST APIs, understand REST principles, Guidelines. · In depth knowledge of Card Scheme Specifications (VISA, MasterCard, Rupay and AMEX), Card · Well versed with payment standards and ISO8583 and EMV data (mandatory), · Hands on experience with Switch payment integration · Resolve technical issues for designers and developers during project lifecycle · Excellent problem solving/troubleshooting skills on Java/J2EE technologies · Result oriented and a versatile engineer who is expert in providing solutions, creating architecture and designs. · Excellent communication (written and verbal) and interpersonal skills |
Roles and Responsibilities
• Code, develop, design and architect features related to the existing application. We
expect you to own modules end to end and take pride in the work products you
ship.
• Lead from the front, when it comes to delivering high quality work products. Serve
as a mentor to the team members
• Create and define performance metrics. Ideate, innovate and hack through the
existing systems to improve performance.
• Perform code reviews, set coding practices and guidelines within the team.
• Make sense of the product specs, be nimble in getting the issues resolved. Be a
thought leader.
Critical Functional Skills:
• Solid understanding and knowledge of Java/C/C++. You should understand the
concepts of multithreading, I/O, messaging, instrumentation etc and their
implementation in Java/Any other Object-Oriented Language.
• Proficiency in the implementation of algorithms and the use of advanced data
structures to solve problems in computing. A solid foundation in the principles of
computer science is desired.
• Ability to write clean, modular, and loosely coupled code by the use of design
patterns.
• He/She should be able to break down and architect complex software systems. For
example- Build
• Cars Availability Engine for Ola.
• Strong decision-making ability
• Deep expertise in at least one programming language & tech stack.
• Substantial experience in building complex and scalable solutions.
• Strong object-oriented design skills, ability to apply design patterns, and an uncanny
ability to design intuitive module and class-level interfaces
• The ability to do deep problem solving and build elegant, maintainable solutions to
complex problems.
• Experience leading multi-engineer projects and mentoring junior engineers
• Experience with full life cycle development in any programming language on a Linux
platform
• Comprehensive operational experience including, optimizations, deployments and
tuning servers like apache/mysql/tomcat/solr
• Prior experience in working with Agile software methodologies (XP, Scrum), TDD,
and Continuous Integration(CI/CD) a plus.
• Experience in building data-driven web application design and development is a plus
• Expert level experience in building a scalable, large and complex business
application.
Experience Required:
• Typically with an experience of 5+ years of development experience in a product
firm.
• Must have lead, designed, architected and delivered at least 1 project in his previous
assignments independently.
Minimum Qualifications Required:
• Btech/MS from a reputed Institute
• Deep expertise with any or combination programming languages: Java, C++, C#,
Ruby, Scala,
• Go any object-oriented high-level proprietary or open-source language with strong
programming constructs. We are not skill-specific but go by strength in
competencies
• Machine coding
• Single machine in-memory program
• Need a working code with functionality
• Readable and well-designed code with right abstractions, separation of concerns,
• right design patterns
• Performant code with concurrency and efficient data structures
• Write test cases covering the happy path and edge cases
• Problem Solving
• Choose the right combination of data structures to solve the problem
• Identify most edge cases for the problem
• Identify opportunities of parallelism: utilizes multi-core solutions where applicable
• Design & Architecture
• Distributed systems design and system interaction
• Identify API signatures
• LLD with class design
• Solve for performance & availability








