
- 5+ years of experience in backend development with a strong focus on Node.js and TypeScript.
- Strong understanding of Node.js frameworks.
- Proficiency in TypeScript, with experience in building scalable applications.
- Solid understanding of RESTful API design, WebSocket, and asynchronous programming patterns.
- Experience with databases (SQL/NoSQL), including MySQL, MongoDB, Redis, etc.
- Familiarity with blockchain technologies and cryptocurrency exchanges is a plus.
- Strong knowledge of security principles and best practices for web applications.

About KoinBX
About
KoinBX is India's most trusted and fastest-growing crypto exchange, dedicated to providing a secure, compliant, and user-friendly platform for crypto enthusiasts and traders across India. As the most trusted and fastest-growing crypto exchange, KoinBX is your gateway to the future of finance, with a user-centric approach, advanced security measures, and an extensive array of cryptos. Our vision is to be the cornerstone of a future where every individual, regardless of background, discovers and harnesses the boundless opportunities of digital assets. KoinBX opens the doors to a future where digital assets play a transformative role in shaping the financial landscape. Our mission is to empower traders by offering a secure and trusted crypto trading platform that is easily accessible to all. We promise to be the gateway ushering in a future of limitless financial possibilities in the realm of digital assets. We provide advanced tools and confidence to navigate the Indian crypto market. We are proud to be 100% compliant with Indian regulations, safeguarding users' funds through robust security measures, including advanced encryption techniques and multi-factor authentication. With over 120 listed cryptos and 150+ active trading pairs, including cryptos like Bitcoin, Ethereum, and Ripple, we provide a comprehensive platform with an intuitive interface, real-time portfolio tracking, and timely price alerts for informed trading decisions. At KoinBX, we offer a wide suite of features designed to meet the diverse needs of both beginner and experienced traders. From instant KYC authentication to low trading fees and high liquidity, our platform is equipped with everything you need to trade cryptos. Join the 5 million+ strong crypto community on KoinBX and begin your crypto journey today. Whether you're a seasoned trader or just getting started, KoinBX is your trusted partner for all your cryptocurrency trading needs.
Candid answers by the company
KoinBX is your gateway to the future of finance, with a user-centric approach, advanced security measures, and an extensive array of cryptos.
Similar jobs
We are looking for a passionate and skilled Node.js Developer to join our dynamic team. If you're excited about building scalable and efficient backend applications using modern technologies, we’d love to hear from you!
Responsibilities
Develop and maintain server-side components using Node.js
Design and build scalable RESTful APIs
Ensure high performance and responsiveness of applications
Implement security and data protection measures
Collaborate with team members to define and deliver high-quality software
Write unit and integration tests to ensure software quality
Required Skills
✅ Strong proficiency in JavaScript
✅ Good understanding of Node.js and Express
✅ Experience with NoSQL databases, especially MongoDB
✅ Familiarity with Git and version control workflows
✅ Ability to write reusable, testable, and efficient code
✅ Experience with JWT and modern authorization mechanisms
✅ Knowledge of security and data protection best practices
✅ Strong analytical and problem-solving skills
Skills:
We would prefer it if the candidate has 1 + years of experience.
- Node.js - must have knowledge and experience
- MySQL/MongoDB - must have knowledge and experience
- GIT
- Any JS backend framework
Responsibilities:
- Participate in the entire application lifecycle, focusing on coding and debugging
- Write code to develop functional web applications
- Troubleshoot and debug applications
- Perform UI tests to optimize performance
- Collaborate with Front-end developers to integrate user-facing elements with server-side logic
- Gather and understand technical and design requirements
- Build reusable code and libraries for future use
- Liaise with developers, designers and system administrators to identify new features
- Follow emerging technologies
Qualification:
- Bachelors in IT Engineering (Preferred)
- Master in Computer Applications
- M.Sc IT
Other Information:
Location:
Mumbai, Malad.
Age group:
22 years to 27 years.
Working Days:
Monday to Friday only, Saturdays and Sundays fixed off.
Working Timings:
10:30 am to 7:30 pm
What you will be Doing
- You will abstract away complex data interactions with easy-to-use APIs that will power several mobile and web applications.
- You will also own, scale, and maintain the computational and storage infrastructure for the various micro-services and long-running jobs, designed and implemented by you and the team.
- We will look to you to make key decisions on the technology stack, architecture, networking, and security. We love working with bleeding-edge technology, especially if it improves the malleability, and simplicity of our deliverables.
What you need
- The ideal Backend Engineers are polyglots who are fluent in HTTP and core CS concepts such as algorithms, data structures, and programming paradigms, and always pick the right tools for the right job.
- They have a keen eye for common security vulnerabilities and how to act on them (example: DDOS attacks, SQL Injection etc.).
- They understand what it takes to work in a startup environment and know when to trade performance for simplicity.
- They fail fast, learn faster, and execute in time.
- Strong communication skills, get-things-done attitude, and empathy
- Strong sense of ownership, drive and obsessive attention to detail.
- Comfortable with iterative development practices and code reviews
- Previous experience as part of a product-oriented team is a plus
Technical Skillsets:
NodeJS + Javascript, GoLang, Typescript + Nodejs, Clojure/Haskell/F#/Scala (languages/environments)
Koa, Express, Play (frameworks)
Asynchronous Programming Frameworks (Akka, Nodejs, Tornado)
MongoDB, postgres, Bigtable, Dynamo (databases)
Apache Kafka, NATS, RabbitMQ, ZeroMQ (queues)
FunctionalProgramming, FRP (functional reactive)
microservices, multi-tenant, distributed-systems, distributed-computing, event-sourcing
Good to have Skillsets:
Clojure/Haskell/F#/Scala
Apache Kafka, NATS
FunctionalProgramming, FRP (functional reactive)
event-sourcing
Koa
Why you should consider this role seriously?
- We have an audacious vision of helping companies fight counterfeiting and managing their supply chain more efficiently
- We have built a product and solved problems for some of the largest brands in the country and tested platform at scale (With our tags present in over 50 Million products already). We have plans to grow 10x in the next 1 year
- Ownership of key problems. Fast-paced environment
- We are a well-balanced team of experienced entrepreneurs and are backed by top investors across India and the Silicon Valley (Venture Highway, Startup Buddy etc.)
- Competitive market salary
- Opportunity to work directly with the CEO, COO, CTO of the company
- A chance to interact with top-notch executives from multiple industries
- Open vacation policy (and we really mean it!)
- Open Pantry
- As a team, we love to travel :). An off-site every quarter
Planning to Apply? Consider this:
Make sure you go through this section very carefully before applying. Here are the most crucial aspects on which we evaluate on:
1: FIT: “We’re on a crusade for something greater than any one of us”!
We are a tight-knit team that works and plays together where ‘fit’ is the most important point that you need to keep in mind while evaluating us- we will be spending a majority of our time together, in office, on calls, even weekends (sometimes) so you’ll really need to assess whether this is the right place for YOU to be in. Are you able to relate to or feel passionate about the problems we’re solving?
2: INTENT: “You won’t just be working with us, you would be investing in us!”
‘Why’ do you want to work with us? Why an early stage startup? Why Original4Sure? We are an industrious team, working tirelessly to achieve our goals so the work hours will be long and with it will come with a steep learning curve. Joining an early stage startup also means you’ll be asked to take on new things with little guidance and you’ll have to figure stuff out on your own, and in doing so, help shape the future of the company. Does that sound scary, exciting, both?
3: CAPABILITY: “Get work done!”
As long as you are working as hard as you can and giving it your best all day, every day, we will get along just fine. No one ever built one of the most valuable businesses in the World without the core team having to make a few sacrifices along the journey. It could be lesser time spent with your family or loved ones or finding lesser time to do to watch TV shows! But that's a call you need to make.
Job Description
We are looking for a Back-End Web Developer responsible for managing the interchange of data between the server and the users. Your primary focus will be development of all server-side logic, definition and maintenance of the central database, and ensuring high performance and responsiveness to requests from the front-end.
Responsibilities
- Integration of user-facing elements developed by a front-end developers with server side logic
- Building reusable code and libraries for future use
- Optimization of the application for maximum speed and scalability
- Implementation of security and data protection
Skills And Qualifications
- Basic understanding of front-end technologies and platforms, such as JavaScript, HTML5, and CSS3
- User authentication and authorization between multiple systems, servers, and environments
- Integration of multiple data sources and databases into one system
- Management of hosting environment, including database administration and scaling an application to support load changes
- Data migration, transformation, and scripting
- Setup and administration of backups
- Creating database schemas that represent and support business processes
- Implementing automated testing platforms and unit tests
- Experience with Kafka / RabbitMQ
- Proficient knowledge of NodeJS
- Working knowledge of databases like PostgreSQL and MongoDB
- Experience with AWS Cloud services like S3 and EC2
- Proficient understanding of code versioning tools, such as Git
You will get to own and build world-class, stable, secure and scalable solutions
Ownership, trust and flexibility comes with the job and you are expected to consistently raise the bar in terms of technical proficiency and quality of code.
You will get to work with a highly experienced team in a very informal, yet results-oriented environment
You should think consumer-first and have the ability to work in a dynamic and fast-paced environment
You will actively participate in defining stable and scalable engineering processes to meet the demands of a fast growing team.
3+ years hands-on application development experience in Python, Django, Flask & NodeJS
Highly proficient in SQL and NoSQL databases and Redis.
Should have a strong hands-on working knowledge on AWS services like EC2, S3, Route53, SES, SQS, SNS etc.
Should have successfully built and deployed complex and resource efficient backend APIs that work flawlessly at scale
Should be willing to take on responsibility and ownership and should be highly motivated and fun to work with :)
Experience in working at fast-paced startups is a big plus!
If you have the knowledge, experience and hunger to make a positive impact, we’d love to meet you.











