
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 clientfacing 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.
Please find the attached study material.
Data structure and Algorithms-
1. Basic Strings, Array and Mathematical based problems.
2. Sliding window problems
3. Problems solved using HashMap, Set and Stack.

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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Experience:
The candidate should have about 1+ years of experience with design and development in Java/Scala. Experience in algorithm, data-structure, database is mandatory.
Required Skills:
- Java or Scala
- Extensive experience in developing web applications. Should possess good Oops knowledge and be aware of enterprise application design patterns.
- Should have the ability to analyze, design, develop and test complexity of spark job.
- Basic working knowledge of Unix/Linux.
Good To have: -
- Python
- Distributed Computing


- Working on the scalability, maintainability and reliability of the products
- Building modular and composable system components
- Above all, delivering value to users
Desired Candidate Profile
What you need to have:- 4+ years of Software Development Experience
- Experience in building Web API based systems in Golang, Python, or Java backed by automated tests
- Experience in building modular monoliths or decoupled microservices
- Relational Data modelling skills, ability to think declaratively in plain SQL
- Experience with using Infrastructure as code tools like Terraform, Ansible etc.
- Experience with logging and monitoring tools
- Good understanding of Linux systems and Containers
- Understanding of CI/CD, software packaging and distribution
- Worked with Orchestrators like Kubernetes/Nomad/Docker Swarm

● You’ve been building scalable backend solutions for web applications.
● You have experience with any of these backend programming languages -- Python,
NodeJS or Java.
● You write an understandable, very high quality, testable code with an eye towards
maintainability.
● You are a strong communicator. Explaining complex technical concepts to designers,
support, and other engineers is no problem for you.
● You possess strong computer science fundamentals: data structures, algorithms,
programming languages, distributed systems, and information retrieval.
● You have completed a bachelor's degree in Computer Science, Engineering or related
field, or equivalent training, fellowship, or work experience.
Must skills:
Hands- on in the following:
- Java 8/J2EE
- Spring boot
- Gradle/Maven
- REST API
- ORM- hibernate/ JPA
- Unit Testing and Integration Testing- Junit/ TestNG
Good to have:
Hands-on in the following:
- CI/CD pipeline deployment
- Messaging- ActiveMQ/RabbitMQ/MQ
- DB2
- Kafka
- NoSQL framework exposure
The ideal candidate should be a proactive individual with strong communication skills and a team player.
Should have hands-on experience in the following:
- He or she should have experience of at least 2 - 4 years in Java development.
- Hands-on experience in designing and developing applications using Java EE platforms and at least 2 - 4 years of experience on the same.
- Should have excellent in-depth knowledge on core java, JSP, servlets, and beans
- Experience in multi-threaded server-side Java programming
- Working knowledge of web services.
- Working knowledge on hibernate and springs framework.
- Experience in writing SQL queries.
- Should have worked in an SDLC environment.
- Good communication skills.
- Experience in working effectively within a team
We are looking for Product Developers-Java Technology with hands-on experience in Core java and socket programming with the flair for working on cutting-edge solutions.
Responsibilities and duties:
- Responsible for the development and unit testing of various modules in JAVA and other related technologies.
- Need to do requirement understanding, preparing initial concept and possible architecture design.
- Responsible for feasibility analysis and POC development.
- Ability to understand the product architecture and end-to-end system flow.
- Ability to relate and analyze tasks as per overall product architecture and philosophy.
- Work in Agile SCRUM development model and be able to plan, estimate, execute and deliver quality work as per committed timeline.
- Ability to continuously analyze and contribute to lean processes, quality improvements, product growth, and productivity improvements within the team.
Required Skills:
- JAVA - Core JAVA Concepts, Socket Communication, Multithreading, Exception Handling, Collections Framework, Reflections, I/O, XML, HTML, JSON, YML
- Database version management tools like Liquibase etc.
- Version control system like GIT. Hands-on experience with strong knowledge of branching, merging,
- Build systems like Maven, Gradle, Ant etc.
- Hands-on experience in running development environment on Unix/Linux (Ubuntu, CentOS).
- Cloud computing experience, Integration with third-party devices, experience in writing REST APIs, shell scripting knowledge will be an added advantage.
We are looking for Product Developers-Java Technology with hands-on experience in Core java and socket programming with the flair for working on cutting-edge solutions.
Job Description
Paytm is looking for hands-on technologists, who will be responsible for architecting & designing new age mobile & web 3.0 products at Paytm.
Key Responsibilities
Incumbent will be architecting our futuristic mobile & web 3.0 products and choose the best
technologies, components and subsystems on different server side tech.
Driving innovations in the product constantly to remain ahead of the curve.
Serve as a thought leader and mentor on technical, architectural, design and related issues.
Proactively identify architectural weaknesses and recommend appropriate solutions.
Balance short-term versus long-term actions, strategic versus tactical requirements, while
continuing to move forward towards the strategic vision.
Collaborate with cross functional teams to solve complex problems and building products
spanning across multiple teams to deliver end-to-end products & features.
Estimates efforts, identify risks, devises and meets project schedules.
Provide functional, design, and code reviews in related areas of expertise with-in team and
cross-team.
Mentor / coach engineers to facilitate their development and provide technical leadership to
them.
Skills required
MS or BS/B.Tech in computer science or equivalent experience from top college.
3+ years of strong software design/development experience in building massively large scale
distributed internet systems and products.
Hands-on experience in Advanced Java/ Node.JS/other backend JavaScript
frameworks, MySQL/NoSQL, golang, etc.
Excellent data structure & algorithm and problem solving skills.
Experience and knowledge of open source tools & frameworks, broader cutting edge
technologies around server side development.
Should be an active contributor to developer communities like Stackoverflow, Topcoder, Github,
Google Developer Groups (GDGs).
Superior organization, communication, interpersonal and leadership skills.
Must be a proven performer and team player that enjoy challenging assignments in a high-
energy, fast growing and start-up workplace.
Must be a self-starter who can work well with minimal guidance and in fluid environment.



Key Skills:
1. One or more of Python/PHP/Ruby/NodeJS/Java
2. Sound object-oriented skills, including strong design patterns knowledge
2. REST APIs
3. MVC architecture
4. MySQL/PostgreSQL
5. Exp with at least 1 NoSQL databases MongoDB/Memcache/Redis/
6. Exp with search technologies Elasticsearch/Solr
7. Exp building messaging based asynchrounous systems RabbitMQ/Kafka/SQS/Celery will be added advantage
8. Exp with Django/Flask frameworks will be added advantage
9. Knowledge of software best practices like Test-Driven Development (TDD) and Continuous Integration (CI) will be added adnavtage
Requirements:
1. Developing software solutions in conjunction with Relational theory, Rest APIs and NoSQL database technologies
2. Knowledge of cloud based technologies in AWS or Azure will be added advantage
3. Understanding of RDBMS technologies like MySQL, PostgreSQL.
4. Hands-on with Version control systems (GIT, SVN) and Unix/Ubuntu.
5. Experience in requirement analysis, HLD, LLD, unit & integration testing.
6. Good hands on experience in debugging application issues
TL;DR
1) Top performer in the company
2) Has worked with product based startup company
3) Ambitious and hardworking

