
- 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.
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We are seeking a Senior Backend Developer who will be pivotal in architecting and developing scalable, reliable backend systems from scratch. You will work closely with product managers, designers, and other engineers to build new products, design backend architectures, and ensure high performance and responsiveness of the systems. This role requires strong backend fundamentals, cloud experience, a deep understanding of databases, and a passion for system design and architecture.
Key Responsibilities:
● Product Development: Architect, design, develop, test, and deploy new backend products and features from scratch.
● System Design: Take ownership of system design and architecture decisions for new modules, ensuring scalability, reliability, and security. ● API Development: Build efficient and reusable APIs and backend services using Node.js.
● Database Management: Design data models, optimize queries, and manage MongoDB clusters efficiently.
● Cloud Management: Deploy, maintain, and optimize services on AWS, ensuring high availability and performance.
● Best Practices: Maintain coding standards, ensure code reviews, and champion best practices in security, testing, and maintainability.
● Collaboration: Work closely with frontend developers, product managers, QA, and other cross-functional teams to define, design, and ship new features.
● Performance Optimization: Monitor system performance and ensure system uptime and responsiveness.
● Mentorship: Provide guidance and mentorship to junior developers as required.
● Documentation: Maintain thorough documentation of systems, processes, and best practices. Must-Have
Qualifications:
● Education: Bachelor’s degree in computer science, Software Engineering, or a related technical field.
● Experience: 4–5+ years of hands-on backend development experience.
● Expertise in: Node.js (Express.js, Nest.js or similar frameworks) MongoDB (including indexing, replication, sharding concepts) AWS Services (EC2, S3, Lambda, RDS, API Gateway, CloudWatch, IAM, etc.) Proficient in: System design principles Microservices architecture Event-driven architecture Strong understanding of: RESTful APIs.Authentication and authorization best practices (OAuth, JWT) Experience with: CI/CD pipelines Docker and containerization principles Hands-on experience in: Building scalable, distributed, and fault-tolerant systems Good knowledge of : Logging, monitoring, and debugging distributed applications
- Participating in design discussions, documentation, and development with the team as needed.
- Reporting to team lead/ manager on daily activities planned, expected deliverables, and reports as defined for the project.
- Participating in requirement gatherings as required.
What you need to have:
- Backend Developer with 3+ yrs of experience
- You have spent at least 2 yrs in a solid back end role.
- Javascript, Typescript, NodeJS
- Client-server architecture
- OOP concepts, including design patterns
- Understanding of RDBMS (MySQL, Postgresql)
- Understanding of REST API
- Familiarity with frameworks such as ExpressJs, NestJs
- Knowledge of TDD frameworks mocha, chai, jest, etc
- Knowledge of AWS (Lambda, RDS, EC2, SQS, S3, ECS, etc)
- Attention to detail
- Excellent communication skills
- Flexible and focussed on solutions
- Organized and self-sufficient
- Prioritize learning and growth
- Enjoy working with a team
- You've prior experience in fintech
- You've had experience taking a problem to a product solution (module/ product)
- Prior experience working with startups and understand the fast-paced, dynamic nature of work.
- You're based in Bangalore, India
Role description:
We are looking for a LEAD- Fullstack with expertise and experience in designing and developing applications including new developments, enhancements, maintenance and support. The role involves continuous collaboration with team, partners.
Candidate description:
Should have:
- Passion for technology and financial domain with demonstrated ability to learn quickly
- Delivery focus with ability to take full ownership
- Strong commitment to quality and delivery
- Strong communication skills
Skills/Knowledge and experience:
- Object oriented design and development skill
- Webservices - Node JS/Express JS, Rest API
- Frontend –, React, Angular (Javascript and Typescript)
- Unix and Shell scripting
- SQL Proficiency, good to know MongoDB
Backend Developer - Node.JS - AirFi
AirFi is a market leader in providing portable Onboard Passenger Entertainment and Mobile Crew Sales Solutions to various passenger travel segments. Founded in 2011 in The Hague, Netherlands - AirFi is the world's fastest-growing company in mobile InFlight Entertainment space and in providing ancillary sales solutions to enterprise customers.
AirFi brings disruptive innovations in a cost-effective manner to the airline cabin and other modes of passenger transport mediums and is making thousands of passengers and crew happy every day all over the globe!
Your key responsibilities
- Responsible for ideating, designing, developing, and supporting the backend services of AirFi web apps for different modes of passenger transport including major airlines across the world.
- Manage your components independently, including but not limited to: gather requirements; communicate design decisions to cross-functional teams including data science, engineering, analytics, and operations; proactively seek user feedback.
- You will help AirFi to quickly iterate and scale web app development to different segments of customers with standard processes, automation, monitoring, and rapid quality assurance.
- Proactively monitor the web apps space for continuous improvements and optimisations, looking for new opportunities and challenges.
What we look for
- Exposure to product development, self-driven, highly motivated and you must be independent in managing on your own components or features
- You must be extremely collaborative and enjoy working cross-functionally with other engineers, designers, and stakeholders
- You must possess an affinity for metrics and analytics - You must be proactive and must move fast or pivot to meet the changing needs of the product
- You are a problem solver and can use everything from front end to command-line tools to help you identify and fix issues.
- You should be diligent, thoughtful, have an eye for detail and have great oral and written communication skills
- Work with product and engineering teams on different data driven products and help drive/implement the Data flows for the same.
- Designing, integrating and documenting technical components for seamless data extraction and analysis
Must have technical skills
- MUST: Experience in Javascript or any modern-day JS frameworks - 7+ years
- Experience NodeJS, MongoDB or any other NoSQL DB - 7+ years
- Experience on building RESTful services and MVC patterns - 5+ years
You get bonus point for
- Responsive web-frameworks (e.g. Foundation, Bootstrap)
- Experience in AngularJS, React, etc - 2+ years
- Linux skills (we run on embedded Linux)
- Expertise HTML5, CSS,
- Experience on Cloudant, AWS, GCP etc.
- Experience on eCommerce or payments related domains
What you can expect
We promise to provide opportunities that not only satisfy your creative instincts but also let you make a significant impact on the products that we create and ultimately the business we are in. We provide a great platform to take up multiple roles based on individual interests or skills and collaborate with different global teams. We boast of a professional, fun work environment with a flat hierarchy and super supportive people to work with. We also encourage a work culture where - no idea is a bad idea and the team can shout it out to be heard!
What more do we offer?
Some of our benefits that our employees cherish:
- Flexible work timings, remote working and work from home options
- Liberal employee policies including genuine open-door policy and special focus on keeping the work culture non toxic
- A very liberal leave policy that includes paternity, adoption and sabbatical leaves
- We provide Skill enhancement sponsorships
- Celebratory team events, regular team virtual GupShups and fun engagement activities including the annual team (destination) meetings and the annual family gala dinner!
- Meal coupons and random gift vouchers
- Career longevity perks and so on!
When we're in office some of the things that make AirFi an interesting place to work are - healthy breakfast, snacks and a fully loaded pantry (read: health alert!); we try to keep AirFi as a fun place to work at and have interesting team activities on Fridays with occasional beers.
You get the opportunity to work and socialise with our global team when they visit or when you visit our customer offices/hangers. Last but not the least, in case you are an aviation geek - the opportunity to be on test flights and learn how the aviation industry works!
Follow and engage with Us!
- https://www.linkedin.com/company/airfi">LinkedIn
- https://www.facebook.com/AirFi.aero">Facebook
- https://twitter.com/airfi_aero">Twitter
- http://airfi.aero/">Website
We are looking for a back end developer with strong foundational knowledge of SQL, microservices architecture and Javascript.
Please don't apply if experience < 2 years || Javascript !=advanced
Responsibilities:
1. Back end ownership and implementation of projects in Node.js
2. Strong knowledge of JS and SQL is critical
3. Knowledge and experince of working on RHEL/Ubutnu servers is an additional bonus
4. Experience in writing large modularised projects
5. Production experience in implementing highly scalable microservices
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Hybrid work model - work from home with 1-2 days in office
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