
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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What you will be doing
● Building and maintaining micro services.
● Develop new features and improve existing features of the application.
● Coding, Implementing, Unit Testing and Documenting Typescript and Javascript based services.
● Design, build, and maintain efficient, reusable, and reliable code.
● Code reviews and ensuring adherence to software development standards.
● Contribute to team and organizational improvements in process and infrastructure.
● Participating in requirements gathering and functional specification activities.
● Resolving and helping to mitigate production issues.
What You'll do:
- 4+ years of experience building scalable backends using Nodejs
- In-depth knowledge of any framework of Nodejs (i.e. Express, Hapi, Koa.js)
- Hands on experience with developing REST APIs using Node.js and any of the above framework
- Should have experience with Socket.IO
- Familiar with oauth integration Social Networking API (Facebook, Twitter, Linked In, Google+)
- Good understanding of standard authentication systems such as OAuth2 and JWT
- Knowledge of server-side templating (e.g. Jade, Handlebars.js, etc.)
- Should have understanding of model, caching, async mechanisms
- Hands-on experience with implementing Role based User authentication and authorization system
- Understanding of caching, database interactions, middlewares
- Able to engineer the best performing solutions and always keeping scalability in mind
What makes you a great fit:
- Strong problem solving skills
- Knowledge of data structures and algorithms
- Hungry for more responsibility and knowledge
- Passion for building robust systems that are engineered to handle failure scenarios, an undying love and attitude for maintaining coding standards
- Strong advocate for producing quality software who makes sure issues are raised and resolved
- Experience with at least one of the cloud platforms like AWS, GCP, Azure, Digital Ocean etc. (docker, Kubernetes, microservice good to have)
Must have skillsets:
Skills : NodeJs
Experience required: + years
Job Type: Full time/ Permanent
Perks and Benefits :
- 5 days working.
- Flexible shift timings
- Company-sponsored certifications.
- Team friendly culture
- Flat hierarchy
- Carrom, Table tennis games, Cricket Tournament Participation for interested employees
- Snack-filled pantry for team members
- Group Medical Insurance (*)
● J2EE with a good understanding of Servlets and JSP
● Experience in Spring Modules – Spring IOC and AOP, Spring Boot (version 2 plus), JDBC
● Expertise in design and development of various web and enterprise – level applications using Java/J2EE
technologies such as Spring, Hibernate, Rest services.
● Web Services (including SOAP, XML, XML Schema, JSON, and REST)
● Tools required: Maven,Eclipse, Github, and Swagger
● Good knowledge of SQL and Redis (NOSql)
● Ability to document requirements and specifications
● Proven work experience as a Software Engineer or Software Developer
● Ability to develop software in Java or any other OOPS languages
● Excellent knowledge of relational databases, SQL and ORM technologies (JPA2, Hibernate)
● Experience in developing Web Applications using at least one popular Web Framework (Spring)
● Experience with test-driven development
● Proficiency in software engineering tools
Introduction
Ever wondered what it would be like to be a part of the core team of Airbnb or Netflix when they were just starting out? Here’s your chance to try that path with Ohana!
We are looking for a founding engineer to join our team.
Who we are
Ohana is an E-learning platform for holistic learning. We are an angel-funded early stage startup backed by some of the marquee angel investors from India and Singapore. Our investors include Vivek HR (co-founder and CEO, Bounce), Tanushree Gupta (co-founder and CEO, Doubtnut), Jagmal Singh (CTO, Janio Asia) to name a few!
Check us out at https://ohana.academy!
Our Product
“Creativity is as important as literacy” - Sir Ken Robinson
With this belief, Ohana is building the world's largest holistic learning academy. Our product offering:
The Classroom: Offering live online classes on arts, crafts, linguistics, yoga, dance and many more subjects
The Playground: Enabling social learning - a community for kids to find peers with similar interests
Our mission
India has 250Mn kids in the K12 segment. However, except the top 0.1%, most parents can’t find high-quality and affordable holistic learning for their kids. Fortunately, 140Mn kids are now connected to the digital world with 4G access. We want to leverage this new connectivity and bridge the gap in children's overall development with Ohana.
Where are we in our journey
Team: We are a team of two co-founders (Saurabh and Suyash), both IIT Delhi alums with over a decade of experience each in leading consumer businesses. We have a total of 15 people team including 4 engineers (currently outsourced)
Customers: Over the last couple of months, we have grown to 5,000+ registered users and aim to reach 10K+ paid users and 1 Mn+ community strength in the next 12 months.
Young, inspired, and focused - We are ready for take-off!
Our Culture
- “Mission-driven” is not a buzzword for us. We care deeply about the impact we want to create on kid’s lives and we want to exemplify the value of “no child left behind”
- Be inclusive - We are creating a product that is accessible and affordable. We want to solve this not just for Bangalore and Mumbai, but for Indore, Jabalpur, Raipur as well
- Not just customer obsessed - we also care about their well-being. We are willing to compromise profits - but will not resort to unethical sales tactics or compromise on product quality
- Our team cares about a strong culture and respects our code of conduct
Why work for us
- We have global ambitions - Holistic education is a $75Bn global market, with India alone contributing more than $10Bn. Apart from salary compensation, you get a piece of the pie (equity) of a potentially billion-dollar organization
- You will have exposure to building large, scalable systems and will be mentored by people who have done the same for millions of users
- You will have exposure to starting up / entrepreneurship (ever feel like you want to build a startup?) owning end to end consumer tech product which impacts the life of thousands of students/parents on daily level
Job Location
We are based out of Bengaluru and work from an office. We encourage working from office, but are completely ok if you would like to work remotely until things return to normal.
Expectations from the role
- You will work closely with the founding team and a small team of engineers, currently outsourced, in a fast-paced environment.
- You will work as a tech lead and will be responsible for architecting the new features as well as improving the existing codebase. You will be expected to have a high degree of ownership and responsibility for deliverables.
- You will wear a product hat as and when required and help in shaping the product.
- You will provide technical mentorship to other engineers in the team and will lead a team of junior engineers.
- You should be able to deal with ambiguity, have strong bias towards action, ability to deep dive whenever required and quickly deliver to unblock the team
Preferred experience and competencies
- You are a software engineer with 4+ years of industry experience.
- Professional experience with at least one web dev framework (ReactJS or Django/Python)
- Professional experience with one or more (SQL or NoSQL) databases.
- A stint in a product company or a startup or any similar faced paced environment is preferable.
- Experience working with cloud infra providers (e.g., AWS, GCP, Azure etc.) is preferable.
- Strong proficiency in REST API
-Strong logic and analytical skills.
-Experience with Node.js, Javascript, HTML5, CSS3.
-Database Experience - Postgres or other relational databases.
-Proficient understanding of code versioning tools, such as Git.
- Experience with performance debugging and benchmarking
- Integration of user-facing elements developed by front-end developers with server-side logic
- Must understand the project requirement and technical documents.
- Ability to complete the task within a specified time with full accuracy.
- Team player with organizational skills. Need to perform programming work in the mobile application as per requirement.
• Design, build and maintain efficient, reusable, and reliable code in Ruby on Rails
• Contribute in all phases of the development life-cycle
• Design, build and own key technology decisions and implementations
• Be an evangelist for Rails and software engineering best practices
• Continually look for opportunities to improve our platform, process, and business
• Continuously discover, evaluate, and implement new technologies
• Work in an agile environment with quick iterations
What we are looking for?
• 2+ years of overall web development experience
• 2+ years experience in developing scalable and robust web applications using Ruby on Rails
• Experience with collaborative code development in small agile teams and managing releases (Git, Continuous Integration, Capistrano)
• Highly proficient in the data structure, algorithms, design patterns, and databases
• Ability to collaborate with other developers and handle the entire software development cycle
• Passion to write beautiful and scalable code
• A disciplined approach to development, documentation, and code structure
• Experience building internal and external APIs and RESTful web services
• Experience in delivering products and services in a high growth, startup environment
write REST API,s and integrate with UI
A great Application Developer has excellent knowledge of Javascript.
They must be familiar with a variety of operating systems and platforms. The ideal candidate will also have an analytical mindset and a keen eye for detail.
The goal is to write “clean” and flawless code to produce fully functional software applications according to requirements.
Responsibilities
Understand requirements and how they translate in application features
Collaborate with a team of IT professionals to set specifications for new applications
Design creative prototypes according to specifications
Write high quality source code to program complete applications within deadlines
Perform unit and integration testing before launch
Conduct functional and non-functional testing
Troubleshoot and debug applications
Evaluate existing applications to reprogram, update and add new features
Requirements
Proven experience as application developer
Experience in designing and building applications
Ability to program in NodeJS and AngularJS
In-depth knowledge of programming for diverse operating systems and platforms using development tools
Excellent understanding of software design and programming principles.
A team player with excellent communication skills
Analytical thinking and problem-solving capability
Great attention to detail and time-management skills







