
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.

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- 2+ year of experience in Development in JAVA technology.
- Strong Java Basics
- SpringBoot or Spring MVC
- Hands on experience on Relationl 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: 6 to 10 Years
Must have:
- Experience in leading teams and handling communication among engineers and product managers,and have worked with mobile teams and product teams.
- Experience working on RFC documentation.
- Experience in architecting the software, estimating tasks, breaking down into subtasks, prioritizing tasks as per need, and timely delivery.
Responsibilities:
- Designing and developing mobile-first applications.
- Creating and maintaining clean and clear front-end code and backend APIs for our web and mobile applications.
- Automation and Deployments of builds - Frontend and Backend.
- Application Performance And Error Monitoring and Automation
- Maintaining excellent test coverage for our code base.
- Follow best practices while reviewing pull requests
- Working with our shared services and field teams to identify application bottlenecks and make relevant architectural decisions.
- Working with our front-end application developers to optimize performance across our system.
- Designing administrative tools for our shared services and business development teams
- Constantly optimizing our code bases with an eye for modularity and legibility.
- Writing documentation for our external and internal APIs.
Requirements:
- Strong understanding of RESTful JSON web API design principles.
- Demonstrable experience with NodeJS, Express. JS, PostgreSQL, MongoDB
- Familiarity with popular NodeJS packages (e. g. express, socket-io).
- Must have experience with test driven development(TDD).
- Experience in JavaScript development.
- Experience in backend web development.
- Containerisation experience working with Docker/ Kubernetes/ Docker Swarm
- Familiarity with multiple additional programming languages/stacks.
- Experience with NoSQL databases, ideally MongoDB.
- Experience with RDBMS databases like MySQL/PostgreSQL.
- An excellent understanding of distributed systems and their tradeoffs.
- Excellent documentation skills.
- Ability to clearly articulate technical problems, design and implementation choices to a broad range of stakeholders (e. g. sales team, users, security experts).
- Experience working with web sockets.
- Familiarity with the AWS stack.
- Experience in application security testing.
- Familiarity with client-side JavaScript frameworks and best practices.
- Familiarity with CI/CD Pipeline.
- Contributions to open source communities.
Perks and Benefits
- Work from anywhere
- Competitive salary and bonus program
- Annual company retreats to fantastic places
- Unlimited Vacation Policy
- Great healthcare coverage
- Professional development allowance
- Internet Allowance
- Customised CMMversary rewards on your 1,3,5,7 and 10-year work anniversaries
- Career Enablement – We meld your upskilling initiatives with organization’s strategic planning
- Take your Birthday Off
About Gobillion
Gobillion is a YCombinator backed IIM-NIT alumni co-founded social commerce startup headquartered in San Francisco, USA with offices in New Delhi, Bangalore and Guwahati. We are bringing e-commerce 2.0 to the next 400 million online customers across India, through a community and social driven approach. Our co-founding has diversified experience with prestigious organizations including McKinsey & Company, Deloitte US, EY, Adobe and SAP Labs.
Gobillion has been rapidly scaling and is backed by some of the world’s most prestigious investors from US, Europe, SE Asia and India including - YCombinator, Justin Mateen (Founder - Tinder), Pioneer Fund, Soma Capital, Venture Souq, Goodwater Capital, LetsVenture, Vikalp Sahni (Co-Founder- Gobibibo) amongst others.
We have been selected for and globally validated by the world’s leading investors/accelerators including YCombinator, Founder Institute Silicon Valley, NASSCOM 10000 Startups - India and Assam Startup. We have been named as the Top 10 Global startup for YCombinator S21 by Alex Mitchell.
Summary of role: As a Developer, you will be working alongside our product team in the conceptualization, design and development of server side components. You will be doing the following on the job
- Write clean, manageable code and maintain proper documentation
- Create, test and deploy and maintain the applications on production servers
- Continuously discover, analyze, and implement new technologies and frameworks to maximize development efficiency
- Lead team in crafting solutions in different areas and ensure timely delivery
- Ensure secure architecture for Servers
Why Join Us?
- You will have a chance to be a leader and have the responsibility to scale Gobillon across India's most fast growing cities
- The opportunity to join one of India’s fastest growing companies at an early stage - We are giving our early team members to benefit from a strong ESOP pool and be part of our growth journey
- Joining an amazing team of Gobillion rockstars from colleges like IIMs, IITs, NITs etc. and from organizations including McKinsey & Company, Deloitte US, EY, Adobe, SAP Labs, Urban Company, Udaan, Amazon, Delivery, Ninjacart, Accenture etc.
- Wear the Gobillion badge with pride - We are looking for owners with a founder’s mindset - not just employees. If you are passionate about our mission about making e-commerce social for the next 400M customers in India and serve as culture carriers - we are the right place for you!
Key Responsibilities of this Role:
- Experience with DevOps and writing REST APIs & Micro services architecture
- Strong programming expertise in Node js, Nest Js
- Good understanding of Mongo databases and other NoSql Databases and SQL Database
- Solid hold on Data structures and Algorithm
- Good understanding of System Design
- Development expertise in AWS services like Lambda, SQS, SNS
- Good understanding of DevOps and Server security
- Exposure to Cloud Platforms like AWS (preferred), Azure or Google Cloud
- Unix command line experience
- Well-versed with Software Development Life Cycle
- Demonstrate the ability to be a self-starter and learn quickly
- Excellent analytical and problem-solving skills
- Passion for learning and implementing new technologies
- Excellent understanding of software Architectures
Company: Runo – https://runo.in
Location: Hyderabad, India
Who We Are:
Runo is a product based funded company incubated at T-Hub (IIITH Campus) and currently operating from Cyber Towers, HiTec City. We offer Call Management CRM for sales teams across the world. We are currently scaling up the engineering team to support the continued growth of the user acquisition in the global market, after a steady success in the Indian market.
The Role:
Runo is looking for a Lead Backend Developer to join our team. The lead backend developer is responsible for scaling up the existing architecture to handle billions of requests every month (We are currently at a scale of 100 million requests per month). You will be contributing in architecting the database/reporting layer to support complex queries and data exports of millions of records. You will be a lead developer responsible for development of new software products and enhancements to existing products.
Our Ideal candidate:
- Proficiency in NodeJS.
- Expert knowledge of NoSQL Databases (MongoDB is preferred)
- Hands on experience of working on products handling more than a million requests per month
- 4-8 years of relevant professional work experience
- Self-motivated, able to work independently. Commitment to high quality.
Responsibilities:
- Contribute to the product architecture in handling millions of requests per day.
- Optimizing the architecture for regional data zones.
- Develop high performance, reusable & bug free APIs
- Optimize the existing APIs for performance (by data denormalization/ decoupling the long running APIs using queues)
- Get familiar with the AWS Services like API Gateway, Lambdas, SNS, SQS, SES
What We Offer:
- Competitive Salary
- ESOPs
- Medical Insurance
About the job:
You'll be responsible for building backend of our platforms. You must know Mongodb, and Node.js.
Expectations:
Develop backend API’s.
Strong ability to design and configure schema and MongoDB data modelling
Assuring the complete stack is designed and built for high performance and scalability.
Your Requirement:
Must know Mongodb and Node.js.
Work experience of minimum 2 years.
Worked with startups and evolved products for scale.
Preferred:
Growth mindset & leadership abilities to work in a frugal environment.
Desired candidates must have 3-7 years of experience as NodeJs Developer.
If the candidate cannot relocate to Gurgaon, we can also provide permanent Work from home for this position.
Roles and responsibilities:
- Responsible for understanding functional and business requirements and translate them into effective code
- Provide support till deployment of code into production.
- Ownership for ensuring code optimization, problem diagnosis, and on-time delivery
- Implement solutions as per the pre-defined framework /guidelines and adherence to processes
- Finding an optimal solution for the problem statement
- Conduct peer code review.
What candidate should know about:
- Excellent hands-on experience with Node.Js, Express.Js, JavaScript
- Understanding the nature of asynchronous programming and its quirks and workarounds
- Excellent hands-on experience with MongoDB, Mongo aggregation, MySQL
- Ability to build REST services, Authentications, MVC applications
- Excellent Object Oriented Programming skills and ability to write modular, secure, scalable, and maintainable code
- Experience with Elastic Search, Redis.
- Knowledge about AWS components (S3, EC2, Cloudfront, Redis Clusters, etc.)
- Self-learning abilities are required
- Familiarity with upcoming new technologies is a strong plus
Experience Level: 3 to 5 Years
Job Location: Hyderabad
Responsibilities
· Excellent knowledge of Core Java and Spring
· Candidate should have a working knowledge of web services
· Should have worked in the distributed agile model and continuous integration
· Should have knowledge of designing and implementation of REST Web services
· Strong experience with REST API and web services
· Should be efficient with Java J2EE and related technologies.
Essential Requirements
· Strong Core Java and spring.
· Strong RESTFUL web service experience
· Strong SQL (preferably Oracle), JQuery, HTML/CSS, Oracle Restful, SOAP web services
· B. Tech/M. Tech from Tier-1 colleges like IIT, NIT, VIT, BIT
Primary Skill: Java, spring & RESTFUL Web services,
➢ Agility and ability to adapt quickly to changing requirements and scope and priorities
➢ Strong proficiency with JavaScript (ECMAScript 5, 6)
➢ Knowledge of Node.js and frameworks available for it (SailsJS, Express)
➢ Understanding the nature of asynchronous programming and its quirks and workarounds
➢ Familiarity with front-end technologies
➢ User authentication and authorization between multiple systems, servers, and environments
➢ Interaction with multiple data sources
➢ Good understanding of SQL syntax
➢ Understanding fundamental design principles behind a scalable application
➢ Understanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platform.
➢ Implementing automated testing platforms and unit tests
➢ Proficient understanding of code versioning tools, such as Git .
➢ Knowledge in the field of IOT is good to have.




