SDE3

Java Developer – Job Description 

Wissen Technology is now hiring a Java Developer 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 consultancy. 

Required Skills: 

• Exp. - 4 to 9 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.

We are seeking a highly skilled and motivated Python Developer with hands-on experience in AWS cloud services (Lambda, API Gateway, EC2), microservices architecture, PostgreSQL, and Docker. The ideal candidate will be responsible for designing, developing, deploying, and maintaining scalable backend services and APIs, with a strong emphasis on cloud-native solutions and containerized environments.

Key Responsibilities:

• Develop and maintain scalable backend services using Python (Flask, FastAPI, or Django).
• Design and deploy serverless applications using AWS Lambda and API Gateway.
• Build and manage RESTful APIs and microservices.
• Implement CI/CD pipelines for efficient and secure deployments.
• Work with Docker to containerize applications and manage container lifecycles.
• Develop and manage infrastructure on AWS (including EC2, IAM, S3, and other related services).
• Design efficient database schemas and write optimized SQL queries for PostgreSQL.
• Collaborate with DevOps, front-end developers, and product managers for end-to-end delivery.
• Write unit, integration, and performance tests to ensure code reliability and robustness.
• Monitor, troubleshoot, and optimize application performance in production environments.

Required Skills:

• Strong proficiency in Python and Python-based web frameworks.
• Experience with AWS services: Lambda, API Gateway, EC2, S3, CloudWatch.
• Sound knowledge of microservices architecture and asynchronous programming.
• Proficiency with PostgreSQL, including schema design and query optimization.
• Hands-on experience with Docker and containerized deployments.
• Understanding of CI/CD practices and tools like GitHub Actions, Jenkins, or CodePipeline.
• Familiarity with API documentation tools (Swagger/OpenAPI).
• Version control with Git.

About Root Node

We’re an early-stage startup building intelligent tools for planning, scheduling, and optimization—starting with timetabling and warehouse logistics. Backed by deep domain expertise and a growing customer pipeline, we’re now building our core tech team. This is not just a coding job — it's a chance to build something meaningful from the ground up.

About the job

• Design and implement robust backend systems and APIs using Java or similar backend language and Spring Boot or equivalent frameworks
• Integrate backend services with existing custom ERP systems 
• Work closely with the founder on product architecture, feature prioritization, and go-to-market feedback
• Take full ownership of features — from system design and development to deployment and iterative improvements
• Help shape our engineering culture and technical foundations

You're a Great Fit If You:

• Have 3+ years of experience in backend development
• Are strong in Java or similar languages (e.g., Kotlin, Go, Node.js)
• Have solid experience with Spring Boot or equivalent backend frameworks
• Have integrated with ERP or enterprise systems in production environments
• Are comfortable with both SQL (PostgreSQL) and NoSQL (MongoDB)
• Understand REST API development, authentication, Docker
• Have an entrepreneurial mindset — you're excited about ownership, ambiguity, and making decisions that shape the product and company
• Want more than just a job — you want to build, solve, and learn rapidly

What We Offer

• Competitive salary
• High degree of ownership and autonomy
• Ability to shape the tech and product direction from Day 1
• Transparent and fast decision-making culture
• A builder’s environment — solve real-world problems with real impact

Job Description: (Mandate Skills)

• Exceptional architecture and design skills using Object Oriented Programming concepts and Design patterns
• Strong problem solving and analytical skills
• Hands on Java Engineer, with experience building consumer facing or enterprise applications using Java stack
• Ability to manage small teams (2-4 members) using agile development process

Do You Know? (Skills good to have)

• Exposure to building service oriented distributed systems
• In building systems that process big data in a distributed environment, either in real time streaming or offline
• In messaging systems like Kafka, RabbitMQ, kinesis, etc.
• In real time computation tools like Storm / Spark or Hadoop based tools.
• In Data warehousing technologies like Redshift, BigQuery, etc.

We are looking for a Java/Full stack Developer with experience in building high-performing, scalable, enterprise-grade applications.

You will be part of a talented software team that works on mission-critical applications. Java developer roles and responsibilities include managing Java application development while providing expertise in the full software development lifecycle, from concept and design to testing.

Java developer responsibilities include designing, developing and delivering high-volume, low-latency applications for mission-critical systems.

Experience : 2+ years

Location : Work from Home (full time)

Notice Period : 0 to 30 days ( Immediate joiners are preferred)

Roles & Responsibilities :

(This role encompassing both API engineering using Java stack and web development. Experience in designing, developing, testing and successfully deploying critical and complex projects.)

• Contribute in all phases of the development lifecycle

• Write well designed, testable, efficient code

• Ensure designs are in compliance with specifications

• Prepare and produce releases of software components

• Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review

• Build reusable code and libraries for future use

Required Skill set :

• Java background with a minimum of 2 years experience in Java technologies.

• Experience in designing and developing application backend using frameworks like Spring Boot, Spring MVC, Jersey, JPA, Hibernate, SQL, Linux, JSON, XML, OAuth etc.

• Add on : Experience with frontend technologies like CSS,HTML,Javascript, NodeJS/Express, Angular, React, ExtJS, Vue is preferred

• Experience with both SQL and NoSQL database systems and writing SQL queries

• Strong experience building, designing, and consuming Restful web services.

• Exposure of Cloud Infrastructure - AWS and Alibaba Cloud

• Excellent understanding of ORM and Database concepts

• Experience with developing unit test code using JUNIT, Power Mock/EasyMock/Mockito etc.

• Experience with Git, Maven and CI/CD pipelines to deploy on Cloud applications

• Experience & knowledge on Micro services Architecture and API development using Java, spring, Spring Boot

• Experienced in roles conducting requirements gathering, writing user stories, creating application design and using design patterns

• Good knowledge on credentials/secrets management and data encryption techniques

• Good knowledge on coding standards, design patterns, unit testing.

• Good hands - on BitBucket/Github is preferred.

Looking candidated from service base or service division of any company.
Minimum Qualification​:

• Hands-on working on Java ( {Language understanding - Java 8, Lambdas, Collections, popular frameworks & libraries}, JVM, GC tuning, performance tuning)
• Worked on REST frameworks/libraries like Spring MVC, Spring Boot, Dropwizard, REST Express etc
• Worked on Relational data stores viz. MySQL, Oracle or Postgres
• Worked on Non-relational data stores viz. Cassandra, HBase, Couchbase, MongoDB etc
• Worked on caching infra viz. Redis, Memcached, Aerospike, Riak etc
• Worked on Queueing infra viz. Kafka, RabbitMQ, ActiveMQ etc

Responsibilities:

• Strong Technical Chops: You should know how to build highly scalable, robust, and fault-tolerant services that support our unique rate-of-growth requirements.
• You should be on top of the latest architectural trends.
• Fast Learners: We are looking for folks who thrive on new technologies and don't believe in one-size-fit all solutions.
• You should be able to adapt easily to meet the needs of our massive growth and rapidly evolving business environment.

• You understand requirements beyond the written word.
• Whether you're working on an API used by other developers, an internal tool consumed by our operation teams, or a feature used by millions of customers, your attention to details leads to a delightful user experience.

Requirements:

• Strong knowledge of MySQL, NoSQL, PostgreSQL, ElasticSearch.
• Experience in Java and web technologies.
• Experience in any one scripting language like Python.
• Hands-on experience with systems that are asynchronous, RESTful and demand concurrency.
• Knowledge of best software engineering practices for all stages of software development life cycle, including coding standards, code reviews, testing and deployment.