
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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About Impact Analytics
Impact Analytics is an agentic-first AI software company transforming retail merchandising through cutting-edge AI, LLMs, and Generative AI technologies. As a fast-growing Series D company with deployments across five continents, it is building both industry-leading merchandising solutions and foundational AI agents that are redefining how retail decisions are made. What makes Impact Analytics unique is its combination of deep retail domain expertise, strong innovation culture, and global presence. It is one of the few India-born AI companies recognized globally by organizations like Fortune, Gartner, and the Inc. 5000.For candidates looking to work on next-generation AI products with global scale and real-world impact, Impact Analytics is an exciting place to build your career. Here’s a link to our website: www.impactanalytics.co.
The impact that you will be making
We are seeking a Senior Software Engineer – Backend to design and build scalable backend systems that power Android-first mobile applications. The ideal candidate will have strong backend engineering expertise, experience supporting mobile applications, and a passion for building high-performance, reliable distributed systems that operate efficiently under constrained network conditions.
You will work closely with Android developers and cross-functional teams to build APIs and backend services that enable seamless mobile experiences, including offline synchronization, scalability, and high availability
What lands you in this role
Key Responsibilities
- Design, develop, and maintain scalable backend services and RESTful APIs for Android/mobile applications.
- Build backend systems optimized for Android-first applications with a focus on performance, reliability, and scalability.
- Develop APIs that perform efficiently in low-bandwidth and intermittent network environments.
- Design and implement backend workflows that support offline synchronization, conflict resolution, and data consistency.
- Develop secure, resilient, and highly available microservices.
- Optimize application performance through efficient database design, caching strategies, and API optimization.
- Collaborate closely with Android engineers, Product Managers, QA, and DevOps teams throughout the software development lifecycle.
- Participate in architecture discussions, code reviews, and technical design decisions.
- Leverage AI-assisted development tools to improve engineering productivity and code quality.
Required Skills
- 4–7 years of professional experience in backend software development.
- Strong proficiency in Kotlin for backend development.
- Experience building backend systems supporting Android/mobile applications.
- Strong understanding of RESTful APIs, microservices, and distributed systems.
- Hands-on experience with Gradle (Kotlin DSL/KTS) for build automation and dependency management.
- Familiarity with Android Studio for debugging, API integration, and collaboration with Android teams.
- Experience with modern backend frameworks and scalable application architecture.
- Knowledge of relational and/or NoSQL databases such as PostgreSQL, MySQL, MongoDB, or similar.
- Experience with caching technologies (Redis) and messaging/event streaming platforms (Kafka or RabbitMQ).
- Hands-on experience with Google Cloud Platform (GCP) or equivalent cloud platforms.
- Proficiency with GitHub and modern Git-based development workflows.
- Experience using Visual Studio Code (VS Code).
- Familiarity with AI-powered developer tools such as Cursor, Windsurf, or similar Agentic IDEs.
- Strong understanding of CI/CD pipelines, containerization, and cloud-native application development.
- Excellent debugging, analytical, and problem-solving skills.
What we offer
- An opportunity to be part of some of the best enterprise SaaS products to be built out of India.
- Opportunities to quench your thirst for problem-solving, experimenting, learning, and implementing innovative solutions.
- A flat, collegial work environment, with a work hard, play hard attitude.
- A platform for rapid growth if you are willing to try new things without fear of failure.
- Remuneration with best-in-class industry standards with generous health insurance cover
Some of our accolades include:
- Ranked as one of America's Fastest-Growing Companies by Financial Times for five consecutive years: 2020-2024.
- Ranked as one of America's Fastest-Growing Private Companies by Inc. 5000 for seven consecutive years: 2018-2024.
- Voted #1 by more than 300 retailers worldwide in the RIS Software LeaderBoard 2024 report.
- Ranked #72 in America’s Most Innovative Companies list in 2023—by Fortune—alongside companies like Microsoft, Tesla, Apple, IBM, etc.
- Forged a strategic partnership with Google to equip retailers with cutting-edge generative AI tools.
- Recognized in multiple Gartner reports, including Market Guides and Hype Cycle, spanning assortments, merchandising, forecasting, algorithmic retailing, and Unified Price, Promotion, and Markdown Optimization Applications.
Requirements
- Senior SD4 engineer/Principal Engineer/ Architect who has led or been part of platform teams inside a large/mid tech company
- Deep expertise working with any of the programming languages to write maintainable, scalable, unit-tested code.Python experience is a bonus - but not required
- Good understanding of REST APIs and the web in general and ability to build a feature from scratch & drive it to completion
- Experience with Kubernetes, Prometheus, Grafana, ELK stack, Load Balancing
- Experience in building a platform team on AWS for Product based companies/start-ups
What You’ll Do
- Build the core technology platform, including Automated provisioning of infrastructure, deployment, and monitoring of services
- Build a central services directory within an organization that shows the cost and health of all services and makes the management of microservices extremely easy
- This involves working with core infrastructure and understanding them in great detail - like Kubernetes, ServiceMesh, Service security
- Mentor/coach engineers to facilitate their development and provide technical leadership
Required Skills:
- 3+ year of experience in Development in JAVA technology.
- Strong Java Basics
- SpringBoot or Spring MVC
- Hands on experience on Relational Databases (SQL query or Hibernate) + Mongo (JSON parsing)
- Proficient in REST API development
- Messaging Queue (RabitMQ or Kafka)
- Microservices
- Any Caching Mechanism
- Good at problem solving
Good to Have Skills:
- 4+ years of experience in using Java/J2EE tech stacks
- Good understanding of data structures and algorithms.
- Excellent analytical and problem solving skills.
- Ability to work in a fast paced internet start-up environment.
- Experience in technical mentorship/coaching is highly desirable.
- Understanding of AI/ML algorithms is a plus.
▪ Experience in developing internet web applications using Java/J2EE technologies.
▪ Experience in different modules of Spring framework like Dependency Injection (IoC), Spring MVC, Spring ORM along with JPA.
▪ Experience in Java Version 7.0+. Good experience with JMS, Spring & Hibernate.
▪ Experience in identifying database solutions for a given problem, preferably MySQL (good to have)
We strongly believe in: Innovation, Perseverance, Compassion, Value Creation & Ownership
- Design and develop Microservices with Java, Spring
- Communicate with the tech lead, to understand the technology thoroughly
- Perform unit and system testing
- Understand business requirements and create plans accordingly
- Work in an agile environment
- Perform threat and risk assessments
Job Description:
- Programming and optimizing smart contracts
- Design, research and develop blockchain-based solutions
- Developing decentralized high-performance systems
- Building reliable and fast data storages
- Security audits of third-party and internal solutions
- Establishing policies and procedures that produce secure, high-quality software
- Write and review technical proposals
- Improve engineering standards, tooling, and processes
- Coding with concurrency, efficiency and scalability as primary motive
- Document systems, build runbooks, and automate those processes
- Being hands on by writing, testing, and deploying high-performance networking code
- Rigor on clean code, unit testing, code coverage and best practices
- Developing infrastructure software
Required qualifications:
4+ years experience in JAVA, 1+ year of experience in Blockchain, willingness to learn on the go, ability to write clean code, a strong sense of responsibility.
Tech Stack:
JAVA, git, linux, bash, ability to work with Docker.
Nice to have:
cryptography and system software development experience, understanding of design patterns, understanding of operating systems and networks, ability to design algorithms and mathematical models.
- The ideal candidate must have experience in enterprise application design, system performance and scalability
- 5+ year experience in web services, distributed systems, and highly available and scalable applications.
- Strong object-oriented programming skills in Java
- Very good knowledge of Core Java and J2EE and should have worked on high availability, low latency platforms.
- Ability to question status quo and identify bad design/code patterns which can impact performance and maintainability of the code.
- Excellent understanding of system design and design patterns.
- Previous experience with the Agile methodology.
- Experience in developing robust RESTful services is desirable.
- Have very good communication skills
- Have strong experience in the Spring framework.
- Good experience in SQL/Oracle
- BS degree in computer science or related fields. MS degree desired
1. Design, develop and deliver web services and jobs that powers Niki, India's first transactional bot.
2. Write code that are clean, testable, performant, scalable, documented and secure
3. Design and architect new sub-systems, idenity perf bottlenecks and suggest design/architect improvements
Qualifications:
1. Minimum of 4 years of software development experience prefrably developing e-commerce applications
2. Bachelor’s and/or Master's degree in Computer Science or related field of study
Preferred Qualifications:
1. Fluent in Java or any other object oriented programming languages
2. Knowledge of Design patterns and design principles
3. Experienced in delivering REST style web services
4. Significant experiences in asynchronous and multi-threaded programming
5. Strong CS fundamentals with good hold on DS and Algo.
Good to have:
1. Knowledge of Spring
2. Experience with AWS, Azure or Google Cloud









