Core Java - Multithreading, Exception handling, Garbage collection.
at OpexAI

About OpexAI
About
We at opexAI strive to make business strategies and provide effective solutions to your complex business problems using AI, machine learning and cognitive computing approaches. With a 40+ years experience in analytics and a workforce of highly skilled and certified consultants, we provide a realistic approach to help you chart an optimal path to success.
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JioTesseract, a digital arm of Reliance Industries, is India's leading and largest AR/VR organization with the mission to democratize mixed reality for India and the world. We make products at the cross of hardware, software, content and services with focus on making India the leader in spatial computing. We specialize in creating solutions in AR, VR and AI, with some of our notable products such as JioGlass, JioDive, 360 Streaming, Metaverse, AR/VR headsets for consumers and enterprise space.
Mon-Fri, In office role with excellent perks and benefits!
Key Responsibilities:
1. Design, develop, and maintain backend services and APIs using Node.js or Python, or Java.
2. Build and implement scalable and robust microservices and integrate API gateways.
3. Develop and optimize NoSQL database structures and queries (e.g., MongoDB, DynamoDB).
4. Implement real-time data pipelines using Kafka.
5. Collaborate with front-end developers to ensure seamless integration of backend services.
6. Write clean, reusable, and efficient code following best practices, including design patterns.
7. Troubleshoot, debug, and enhance existing systems for improved performance.
Mandatory Skills:
1. Proficiency in at least one backend technology: Node.js or Python, or Java.
2. Strong experience in:
i. Microservices architecture,
ii. API gateways,
iii. NoSQL databases (e.g., MongoDB, DynamoDB),
iv. Kafka
v. Data structures (e.g., arrays, linked lists, trees).
3. Frameworks:
i. If Java : Spring framework for backend development.
ii. If Python: FastAPI/Django frameworks for AI applications.
iii. If Node: Express.js for Node.js development.
Good to Have Skills:
1. Experience with Kubernetes for container orchestration.
2. Familiarity with in-memory databases like Redis or Memcached.
3. Frontend skills: Basic knowledge of HTML, CSS, JavaScript, or frameworks like React.js.


Construction & Infrastructure is one of the industries, with the most complex problems in Supply Chain and they are fundamentally reengineering the way construction materials get procured. Their Clients include the biggest names in India & the World– The
LafargeHolcim Group, JSW Group, The Tatas and many others. They are backed by some of the world’s top marquee funds in their journey to create transparency and standardization to an otherwise opaque industry.
Your responsibilities:
● Understand the business context and build high quality code using proven design patterns
● Develop, test and deploy integrations required to meet business requirements
● Carry out unit tests and other quality control mechanisms to inform and validate the code and design
● Utilizing and monitoring cloud infrastructure resources (such as AWS, Azure) efficiently
● Participate in a highly fluid environment applying agile software development principles
● Ensure the coding standards are on-par with the best in the industry
Educational Qualifications:
● Bachelor's or Master’s degree in a quantitative field (e.g. Mathematics, Engineering, Computer Science).
Must have skills:
● 3+ years of work experience with mobile/web development
● Experience in working with either of languages: Go, Java, Scala
● Strong understanding of relational and non-relational databases (MySQL, PostgreSQL, MongoDB,
● Cassandra)
● Strong understanding of Message brokers
● Must have hands on experience in Restful APIs
● Must have a strong foundation of Data structures and Algorithms
● Using logic and reasoning to identify the strengths and weaknesses of alternative solutions, conclusions
● or approaches to problems
● Ability to deploy features on a daily basis: should be good at time management and prioritization
● Hands-on experience in CI/CD principles and TDD
● Strong written and verbal English communication skills
Good to have skills:
● Experience in event-driven & asynchronous I/O frameworks
● Exposure to business process and workflow automation
● Working experience in process driven and data intensive business applications
● Experience in working on web infrastructure with React.js and React Native
Professional traits:
● Self-motivated, persistent and “Never Give Up” attitude
● Passion for innovation and adaptability to a lean startup culture
● Ability to work with minimal supervision, independently and / or as a member of a team


About the Company:
We are a Series A funded Indonesian online group buying platform that helps people connect with like minded people who want to buy the same item/product at a discounted price. The team is spread across India and Indonesia, and is led by experienced founders who have founded, set-up, scaled and exited businesses across India and Indonesia. We have raised our first round of funding, and are growing extremely fast. We are actively looking for Full Stack developers to join our team.
Job Duties and Responsibilities
We are looking for an experienced full-stack engineer to implement both back-end and front-end software solutions to serve both internal and external customers. The position entails working in an agile team to develop Java- and React-based projects that support our system.
- Design, implement and test full-stack solutions using Java, Spring and React
- Design robust spring system that can support 2-5mil users.
- Work alongside other team members to integrate various components into finished product
- Work closely with product owner to create stories
- Continuously create new and interactive features that would help to improve user experience and user engagement.
- Assist with troubleshooting of issues as needed
- Participate in the design and architecture of software solutions
- Assist in developing and maintaining continuous integration pipelines
Salary range : 15 lpa - 30 lpa or more depending on candidate experience.
Skills required :
You will be best qualified if you have experience with several (not all) of the following:
- JAVA
- Python (Flask and Django)
- Spring/Spring Boot
- React
- Hibernate
- Linux
- REST
- Kafka
- Mysql
- AWS
- ELK Stack (Elasticsearch)
- CI/CD Pipelines
Qualifications:
- 2+ years of experience in Java based technologies
- 1+ years of experience in Python
- Experience in designing databases and system architecture
- 1+ years of experience in Front end technologies like HTML, CSS, JavaScript and ReactJs
Why join us?
- You will get to work with an experienced team who has worked in multiple startups.
- Experimenting is the name of the game. And POCs are the snacks that fuel them.
- Grow with us. It is a family
- Gain exposure to two of the fastest growing markets in the world - South East Asia and Social Commerce


About this roleWe are seeking an experienced MongoDB Developer/DBA who will be
responsible for maintaining MongoDB databases while optimizing performance, security, and
the availability of MongoDB clusters. As a key member of our team, you’ll play a crucial role in
ensuring our data infrastructure runs smoothly.
You'll have the following responsibilities
Maintain and Configure MongoDB Instances - Responsible for build, design, deploy,
maintain, and lead the MongoDB Atlas infrastructure. Keep clear documentation of the
database setup and architecture.
Ownership of governance, defining and enforcing policies in MongoDB Atlas.Provide
consultancy in drawing the design and infrastructure (MongoDB Atlas) for use case.
Service and Governance wrap will be in place to restrict over provisioning for server size,
number of clusters per project and scaling through MongoDB Atlas
Gathering and documenting detailed business requirements applicable to the data
layer.Responsible for designing, configuring and managing MongoDB on Atlas.
Design, develop, test, document, and deploy high-quality technical solutions on the
MongoDB Atlas platform based on industry best practices to solve business needs.
Resolves technical issues raised by the team and/or customer and manages escalations as
required.
Migrate data from on-premise MongoDB and RDBMS to MongoDB AtlasCommunicate
and collaborate with other technical resources and customers in providing timely updates
on status of deliverables, shedding light on technical issues, and obtaining buy-in on
creative solutions.
Write procedures for backup and disaster recovery.
You'll have the following skills & experience
Excellent analytical, diagnostic skills, and problem-solving skills
Should understand the Database concept and develop expertise in designing and
developing NoSQL databases such as MongoDB
MongoDB query operation, import and export operation in database
Experience in ETL methodology for performing Data Migration, Extraction,
Transformation, Data Profiling and Loading
Migrating database by ETL, migrating database by manual process and designing,
development, implementation
General networking skills, especially in the context of a public cloud (e.g. AWS – VPC,
subnets, routing tables, nat / internet gateways, dns, security groups)
Experience using Terraform as an IaC tool for setting up infrastructure on AWS
CloudPerforming database backups and recovery
Competence in at least one of the following languages (in no particular order): Java, C++,
C#, Python, Node.js (JavaScript), Ruby, Perl, Scala, Go
Excellent communication skills, often being able to compromise but draw out risks and
constraints associated with solutions. Be able to work independently and collaborate with
other teams
Proficiency in configuring schema and MongoDB data modeling.
Strong understanding of SQL and NoSQL databases.
Comfortable with MongoDB syntax.
Experience with database security management.
Performance Optimization - Ensure databases achieve maximum performance and
availability. Design effective indexing strategies.
Job Overview:
We are looking for a Java 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/Java EE application development
while providing expertise in the full software development lifecycle, from concept and design to
testing.
Responsibilities and Duties:
• Contribute to all phases of the development lifecycle
• Write well designed, testable, efficient code
• Ensure designs should follow compliance with specifications
• Prepare and produce releases of software components
• Support continuous improvement by investigating alternatives and technologies and
presenting these for architectural review
Qualifications:
• BE/MCA/BCA/MS/BS degree in Computer Science, Engineering, or a related subject
• Minimum 1 to 4 years of experience
• Proven hands-on Software Development experience
• Proven working experience in Java development
• Hands on experience in designing and developing applications using Java EE
platforms
• Excellent knowledge of Relational Databases, SQL and ORM technologies (JPA2,
Hibernate)
• Experience in the Spring Framework
• Very good English communication skills
• Optional:
o Good to have the knowledge of Angular JS framework.
o Experience to work on the Micro service architecture.
o Experience to work with Git hub & bitbucket.
o Agile methodology.
- 5-8 years of experience as a Java/J2EE developer.
- 1-3 years of experience with Angular / React is desirable.
- 1-3 years of experience in using Spring and Spring Boot frameworks.
- Thorough knowledge of server-side development.
- Proven experience as a Full Stack Developer or similar role.
- Good understanding of web services (WSDL SOAP, RESTful).
- Hands-on experience in using Application Servers like WebSphere.
- Expertise in relational databases (Oracle, SQL Server).
- E-commerce domain knowledge is desirable.
- Prior experience in developing desktop and mobile applications.
- Familiarity with common stacks.
- Knowledge of multiple frontend languages and libraries, like HTML/ CSS, JavaScript, XML, jQuery.
- Experience in implementation of Microservices
- Experience with AWS (S3, SQS, SNS, ECS, EC2, ALB, API Gateway, Lambda, etc.) is highly desirable
- Good understanding of Docker & Kubernetes is highly desired.
- Familiarity with databases (MySQL, MongoDB, PostgresSQL), web servers (Apache), and UI/UX designs.


● You have a minimum of 7 years of experience working on production systems at a
productcompany with a decent scale
● You have a deep understanding of design patterns, memory/performance optimization, and how to summarise and share knowledge
● You have experience developing software services and an understanding of design for scalability,performance, and reliability
● You have excellent experience in managing security, reliability, performance, maintainability, and scalability
● You have familiarity with microservice architecture, containers, and related technologies
● You have strong knowledge of software development fundamentals, including relevant backgroundin computer science fundamentals and agile development methodologies.
● You have a strong development experience in using modern web frameworks in
programminglanguages like Ruby on Rails, Python, Javascript.
● You have a strong understanding of relational databases and SQL and you practice test drivendevelopment
● Would be an added advantage if you have a passion for mentoring and helping people on your team grow and achieve their goals
● You are an excellent collaborator & communicator. You know that startups are a team sport. Youlisten to others, aren’t afraid to speak your mind and always try to ask the right questions.
● You are excited by the prospect of working in a distributed team and company.
● If you like to tinker and have hobby projects, send us links to your blog, github etc
Location: We are open to candidates working from anywhere in India/across the globe. At the moment, however, like most teams, we are fully remote.
Building highly-scalable and secure payments platform
Primary owners of one or more components of the platform and will drive innovation in
your area of ownership
Working with various product teams gathering requirements and adding capabilities
Working with some of the smartest people in the industry and will have ample opportunity to learn and grow
Using cutting-edge cryptography to secure payments beyond industry standards
Deriving actionable insights by mining TBs of data
Building a low-level infrastructure that aims to push the boundaries of network
performance
Participating actively in recruitment and nurturing of engineers as awesome as you
What do we look for?
Review and influence new evolving design, architecture, standards and methods with
stability, maintainability, and scale in mind
Identify patterns and provide solutions to class of problems
Research, evaluate and socialize new tools, technologies, and techniques to improve the value of the system
Be able to multitask, prioritize and handle dependencies with minimal oversight
From a technology perspective, you should have the knowledge and/or experience in a
reasonably sized subset of the following ( the more, the merrier!! )
Worked on one or more large scale java applications
Good understanding of nuances of distributed systems, scalability, and availability
Good knowledge of one or more relational and NoSQL databases and transactions
Shrewd focus on latency and throughput of services
In-depth understanding of concurrency, synchronization, NIO, memory allocation and GC
Experience with IaaS clouds like AWS/Google Cloud, Azure, OpenStack etc..
Experience in working with Message Brokers and Application Containers
Great ability to mentor and train other team members

As a Software Engineer at Quince, you'll be responsible for designing and building scalable infrastructure and build applications to solve some very interesting problems in the logistics and finance tech space.
Responsibilities:
- Design and architect solutions on the cloud for various business problems with workflow efficiency and scale in mind.
- Be on the forefront with the business team to learn, understand, identify and translate function requirements into technical opportunities.
- End-to-end ownership - from scoping the requirements to the final delivery of the solution with keen eye to details and quality.
- Build and improve logistics components for this innovative M2C supply-chain model.
- Build and maintain scalable ETL data pipelines.
Requirements:
- Bachelors/Masters/PhD in Computer Science or closely related subject.
- 1-5 years of experience in building software solutions.
- Good at data structures and their practical applications.
- Proficiency in Kotlin, Java, Python.
- Experience in deploying and maintaining applications on cloud platforms (Ex: AWS, Google cloud).
- Proficiency with SQL and databases - relational and/or nosql (Snowflakes, AWS RedShift, etc).
- Experience with messaging middleware such as Kafka is good to have.


- Work with the team to develop user-facing web applications utilizing various languages (like Java, golang, scala, etc.), RDBMS and NoSQL Databases, and latest frontend frameworks (including React, Vue, JQuery, etc).
- Assists in the technical evaluation, design, integration (utilizing an SOA), implementation, and support of projects.
- Communicating status to the team, business, and leadership.
- Participate in Code-Reviews
Required Skills:
- Java 1.8 or higher
- JavaScript and client-side libraries (such as jQuery, Ignite UI and bootstrap, Vue.js, React, etc)
- Intellij Idea or any other development tool
- Hibernate/ ibatis
- Spring/Spring Boot
- Oracle 12c and PL/SQL
- HTML
- CSS
- Git
- Web servers like Tomcat, Jetty, etc.
Nice to Have Skills:
- .NET 4.5 or higher
- NET MVC and Web API
- Deployment Tools like Team City, Jenkins, Octopus, etc.
- Experience Required:
- Minimum of 5 years of hands-on Java experience.
- Excellent understanding of web technologies.
- Experience developing REST-based web services
- Strong understanding of source control systems such as GIT knowledge of creating and managing GIT flows a plus.
- Basic knowledge of distributed systems a plus.
- Strong database skills using Oracle and PL/SQL.
- Excellent oral and written communication skills.
- Strong organizational skills and detail-oriented

