Backend Developer

• Build campaign generation services which can send app notifications at a speed of 10 million a minute
• Dashboards to show Real time key performance indicators to clients
• Develop complex user segmentation engines which creates segments on Terabytes of data within few seconds
• Building highly available & horizontally scalable platform services for ever growing data
• Use cloud based services like AWS Lambda for blazing fast throughput & auto scalability
• Work on complex analytics on terabytes of data like building Cohorts, Funnels, User path analysis, Recency Frequency & Monetary analysis at blazing speed
• You will build backend services and APIs to create scalable engineering systems.
• As an individual contributor, you will tackle some of our broadest technical challenges that requires deep technical knowledge, hands-on software development and seamless collaboration with all functions.
• You will envision and develop features that are highly reliable and fault tolerant to deliver a superior customer experience.
• Collaborating various highly-functional teams in the company to meet deliverables throughout the software development lifecycle.
• Identify and improvise areas of improvement through data insights and research.

• 2-5 years of experience in backend development and must have worked on Java/shell/Perl/python scripting.
• Solid understanding of engineering best practices, continuous integration, and incremental delivery.
• Strong analytical skills, debugging and troubleshooting skills, product line analysis.
• Follower of agile methodology (Sprint planning, working on JIRA, retrospective etc).
• Proficiency in usage of tools like Docker, Maven, Jenkins and knowledge on frameworks in Java like spring, spring boot, hibernate, JPA.
• Ability to design application modules using various concepts like object oriented, multi-threading, synchronization, caching, fault tolerance, sockets, various IPCs, database interfaces etc.
• Hands on experience on Redis, MySQL and streaming technologies like Kafka producer consumers and NoSQL databases like mongo dB/Cassandra.
• Knowledge about versioning like Git and deployment processes like CICD.

1. Design patterns- socket communication/ micro services architecture

2. Caching - REDIS MEMCACHED etc

3. Database - MONGO, SQL etc. min 2yrs experience with these.

4. Features created for large concurrent requests.

5. Node Js, Go lang any asynchronous programming language min 2 yrs exp with any one of them.

6. Message Queues - RABBIT MQ, Kafka etc.

Context for the Candidates:

Blockchain engineers are tasked with building secure, scalable, and high-performance decentralized applications. This discussion focuses on how to utilize key technologies—Node.js, Rust, Go, TypeScript, Ethers.js, viem, and Hardhat—in smart contract and blockchain system development, while addressing the practical challenges that arise in such projects.

Key Discussion Points:

• How do you integrate Node.js, Rust, Go, and TypeScript in blockchain-backed applications?

• Discuss the trade-offs between using Rust or Go for performance-critical blockchain services.

• What are the key challenges in ensuring the security and scalability of smart contracts using tools like Ethers.js, viem, and Hardhat?

• How do you approach testing, debugging, and deploying smart contracts in a decentralized environment?

• Share best practices for gas optimization, contract upgradability, and backend scalability.

Evaluation Criteria:

1. Technical Knowledge:

• Strong knowledge of Node.js, Rust, Go, and TypeScript with practical experience in blockchain development.

• Proficiency in Ethers.js, viem, Hardhat, and smart contract lifecycle (development, testing, deployment).

• Understanding of security best practices, performance optimizations, and scalability in decentralized systems.

2. Problem-Solving and Integration Skills:

• How candidates approach integrating smart contract solutions with backend services using Node.js, Rust, Go, and TypeScript.

• Solutions proposed for common challenges in blockchain projects such as gas fees, security vulnerabilities, and system bottlenecks.

3. Experience and Expertise:

• Minimum of 2 years of IT experience, including hands-on development with the specified technologies.

• Practical knowledge of blockchain architecture, consensus mechanisms, and decentralized application deployment.

4. Innovation and Critical Thinking:

• Candidates’ ability to think creatively about system architecture, proposing scalable and secure solutions for blockchain-based applications.

• Discussion on the future potential of blockchain technology and how the tech stack can evolve.

5. Communication and Team Collaboration:

• Clear articulation of technical challenges and how to address them in a team setting.

• Ability to lead or contribute to discussions in a way that encourages collaboration and team-driven problem-solving.

• Previous working experience as a MEAN Stack Developer for 1+ years
• BSc degree in Computer Science or similar relevant field 
• In-depth knowledge of NodeJS, ExpressJS or Restify
• Experience implementing applications using Angular 1 or React
• Experience creating front end applications using HTML5, Angular, LESS/SASS
• Hands-on experience with JavaScript Development on both client and server-side
• Experience with modern frameworks and design patterns, minimum one-year experience with MEAN Fullstack paradigm
• Knowledge of the following will be considered as an advantage:
• Consumer Web Development Experience for High-Traffic, Public Facing web applications
• Experience with cloud technologies also a plus
• Creating secure RESTful-based web services in XML and JSON, Javascript, JQuery
• Continuous integration (Jenkins/Hudson) and version control (SVN, Git).

• Minimum 3 years of experience in Node JS.
• Minimum 1 years of experience in Mongo DB (optional)
• Good Hands-on experience in Angular or React.
• Experience in designing and building large-scale, high availability, secure web applications and REST-full API using Node.js in an agile methodology.
• Good Hands-on experience in Node Js frameworks like Express, .
• Strong proficiency with JavaScript and Node.JS
• Knowledge and understanding of Event Loop architecture.
• Knowledge and understanding of promises and (async or await)
• Implementation of security like oauth 2.0, JWT and data protection.
• Good Hands-on experience on cache server.
• Knowledge and understanding of Request, Axios, proficiency in REST-ful APIs.
• Knowledge of data structures and Algorithms, Node Global variables and In-built libraries
• Understanding the nature of asynchronous programming and its quirks and Workarounds
• Design and implementation of low-latency, high-availability, and performant applications.

Requirements:

• Experience in Enterprise Java building restful microservices
• Strong Exposure to any of the Java Enterprise frameworks such as Spring, Vert. x, Quarkus or others
• Good exposure to databases such as PostgreSQL, MongoDB etc
• Good analytical and problem-solving capabilities along with excellent communication skills.
• Any exposure to UI programming using REACT JS or AngularJS is a plus
• Preferred candidate who can join in 15 days or max 30 days.

• NoSQL DB (MongoDB, CouchDB), PostgreSQL
• Mocha test environment
• Should JS testing framework
• Experience implementing mock services
• Nock API mocking
• NPM, Redis
• Typescript / Coffee script experience will be an added advantage
• Experience working with opensource JS projects
• Experience in developing REST API
• Source code management tool - Git / GitHub
• Understanding of TCP/IP networking and client/server web programming model
• Good communication skills
• Should be able to work with the cross-geo client team