Wissen Technology

Job Summary

We are seeking a Java + Big Data Engineer with hands-on experience in Big Data and Apache Spark. The ideal candidate should be strong in Core Java, comfortable working across backend and frontend layers, and capable of building scalable data-driven applications.

Must have:

• Overall 2+ years of experience in Big Data, Spark.
• Hands On experience on Big Data
• Expertise in Unix Commands and Bash scripting
• Must have experience on Spark With java(Strong experience in Core Java (multi-threading, collection Framework is must) and PL SQL.
• Ensure proper configuration management and change controls are implemented during code creation and deployment.
• Strong analytical skills demonstrated by the ability to research and to apply problem-solving skills to complex technical problems.

Key Responsibilities

• Design and develop full-stack applications using Java backend and modern frontend frameworks
• Build and maintain Spark-based data processing jobs using Java
• Develop and consume REST APIs for data-driven applications
• Optimize Spark jobs and Java services for performance and scalability
• Write efficient PL/SQL queries for data access and transformation
• Use Unix and Bash scripting for automation and operational tasks
• Ensure adherence to coding standards, version control, and deployment processes
• Collaborate with frontend, backend, and data engineering teams

NOTE: One technical round needs to be taken F2F from Pune office.

We are seeking a skilled Java Developer with hands-on experience in Java and Spark to build scalable data processing solutions. You'll contribute to high-performance data pipelines and analytics platforms in a dynamic Agile environment.

Key Responsibilities

• Design and develop Java applications integrated with Apache Spark for ETL processes, data transformations, and analytics.
• Build and optimize Spark jobs (Spark SQL, DataFrames, Streaming) for large-scale data processing.
• Collaborate with data engineers and analysts to implement robust data workflows.
• Write clean, maintainable Java code following best practices (Spring Boot, Microservices preferred).
• Perform code reviews, unit testing, and contribute to CI/CD pipelines.
• Troubleshoot and optimize Spark performance for production workloads.
• Document technical solutions and mentor junior developers.

Required Skills & Qualifications

• 4-7 years of hands-on Java development experience.
• Strong expertise in Apache Spark (Spark Core, Spark SQL, PySpark basics).
• Proficiency in Java 8/11+ with multithreading and collections frameworks.
• Experience with data processing (ETL, data pipelines, big data).
• Familiarity with build tools (Maven/Gradle) and version control (Git).
• Strong problem-solving skills and Bangalore location availability.
• Excellent communication skills for cross-team collaboration.

Good to Have

• Experience with Snowflake for cloud data warehousing.
• Knowledge of DBT (Data Build Tool) for analytics engineering.
• Python scripting for data manipulation and automation.
• Exposure to AWS/GCP/Azure cloud platforms.
• Familiarity with Kafka, Airflow, or containerization (Docker/Kubernetes).

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.

JOB DESCRIPTION:

Location: Pune, Mumbai

Mode of Work : 3 days from Office

DSA(Collections, Hash maps, trees, Linkedlist and Arrays, etc), Core Oops concepts(Multithreading, Multi Processing, Polymorphism, Inheritance etc) Annotations in Spring and Spring boot, Java 8 Vital features, database Optimization, Microsevices and Rest API

• Design, develop, and maintain low-latency, high-performance enterprise applications using Core Java (Java 5.0 and above).
• Implement and integrate APIs using Spring Framework and Apache CXF.
• Build microservices-based architecture for scalable and distributed systems.
• Collaborate with cross-functional teams for high/low-level design, development, and deployment of software solutions.
• Optimize performance through efficient multithreading, memory management, and algorithm design.
• Ensure best coding practices, conduct code reviews, and perform unit/integration testing.
• Work with RDBMS (preferably Sybase) for backend data integration.
• Analyze complex business problems and deliver innovative technology solutions in the financial/trading domain.
• Work in Unix/Linux environments for deployment and troubleshooting.

JOB DESCRIPTION:

Location: Pune, Mumbai, Bangalore

Mode of Work : 3 days from Office

* Python : Strong expertise in data workflows and automation

* Pandas: For detailed data analysis and validation

* SQL: Querying and performing operations on Delta tables

* AWS Cloud: Compute and storage services

* OOPS concepts

Job Description: (Big Data Developer with Java)

Exp – 7+ years

Location – Baner, Pune

Mode of Work: Hybrid (3 days from Baner)

Main Hands on: Bid Data frameworks, Java and AWS EMR

Roles and Responsibilities

• Design, develop, and maintain data pipelines on AWS EMR (Elastic MapReduce) to support data processing and analytics.
• Implement data ingestion processes from various sources including APIs, databases, and flat files.
• Optimize and tune big data workflows for performance and scalability.
• Collaborate with data scientists, analysts, and other stakeholders to understand data requirements and deliver solutions.
• Manage and monitor EMR clusters, ensuring high availability and reliability.
• Develop ETL (Extract, Transform, Load) processes to cleanse, transform, and store data in data lakes and data warehouses.
• Implement data security best practices to ensure data is protected and compliant with relevant regulations.
• Create and maintain technical documentation related to data pipelines, workflows, and infrastructure.
• Troubleshoot and resolve issues related to data processing and EMR cluster performance.

Qualifications:

• Bachelor’s degree in computer science, Information Technology, or a related field.
• 7+ years of experience in data engineering, with a focus on big data technologies.
• Strong experience with AWS services, particularly EMR, S3, Redshift, Lambda, and Glue.
• Proficiency in programming languages Java.
• Experience with big data frameworks and tools such as Hadoop, Spark, Hive, and Pig.
• Solid understanding of data modeling, ETL processes, and data warehousing concepts.
• Experience with SQL and NoSQL databases.
• Familiarity with CI/CD pipelines and version control systems (e.g., Git).
• Strong problem-solving skills and the ability to work independently and collaboratively in a team environment.

NOTE: Two technical rounds has to be taken F2F from Pune office. Hence professionals should be present in Pune.

React Native Developer:

Exp-5 to 8 Years Location -Bangalore

• Proficient in React, JavaScript (ES6+), and TypeScript.
• Expertise in state management libraries (Redux, Zustand, etc.).
• Hands-on experience with react-navigation and deep linking.
• Solid understanding of Expo (both managed and bare workflows).
• Knowledge of native development (Swift/Objective-C for iOS, Java/Kotlin for Android).
• Experience with custom native module bridging and native UI integration.
• Strong debugging skills using tools like Flipper and Chrome DevTools.
• Familiarity with Jest, React Native Testing Library.
• Experience with REST APIs, GraphQL, and real-time data (WebSockets).
• Ability to manage OTA updates with EAS Update and configure EAS Build.
• Experience in app publishing and release lifecycle on both Play Store and App Store
• Knowledge of secure storage, token handling, and app-level security practices.

Location: Pune( Viman Nagar )

Experience: 4+years

Work of mode: Hybrid (2pm to 10 pm , 4 days work from office)

Please find the below job description:

Minimum 4+ years of experience building global enterprise level systems

Extensive experience developing complex distributed event-based microservices using C#/.Net Core

Knowledge with containerisation (Docker, Kubernetes)

Experience with cloud platforms (Azure, AWS)

Exposure with distributed messaging / streaming platforms (Apache Kafka)

Involvement building CI/CD pipelines (ideally Azure DevOps)

Excellent knowledge of Relational Databases SQL and No-SQL databases.

* Python (3 to 6 years): Strong expertise in data workflows and automation

* Spark (PySpark): Hands-on experience with large-scale data processing

* Pandas: For detailed data analysis and validation

* Delta Lake: Managing structured and semi-structured datasets at scale

* SQL: Querying and performing operations on Delta tables

* Azure Cloud: Compute and storage services

* Orchestrator: Good experience with either ADF or Airflow

Experience- 8 to 11 years

Location- Bangalore

Work Mode- Hybrid

Role- SDET Lead Engineer

Job Overview: We are looking for a highly skilled Software Development Engineer in Test (SDET) with proven experience in product development and the financial services domain.

Education & Technical Qualifications:

• Bachelor’s / master's degree, in IT OR Computer Science strongly preferred.
• Strong experience in Backend & UI Automation, API Automation, and Database
• Hands-on experience with REST API automation and WebSocket automation
• Hands-on experience with Java programming languages
• Proficiency in JavaScript
• Extensive hands-on experience with automation tools: Selenium, Rest-Assured, TestNG, TOSCA
• Expertise in BDD with Cucumber
• Ability to design, develop, and maintain scalable automation frameworks
• Strong understanding of test strategies, test planning, and defect management
• Experience in integrating automation suites with CI/CD pipelines
• Good understanding of Agile/Scrum methodologies

Roles & Responsibilities:

• Design, develop, and execute automated test scripts for UI, API, and DB layers
• Automate REST APIs and WebSocket-based services
• Implement BDD scenarios using Cucumber and maintain feature files
• Collaborate with developers, product owners, and QA teams to ensure quality delivery
• Analyze test results, report defects, and track them to closure
• Continuously improve test coverage and automation efficiency
• Participate in code reviews and provide quality-driven feedback