Senior Backend Engineer (Node.js, AI-Native Top Fintechp company only) at Staffnixcom · Bengaluru (Bangalore) · 6 - 10 years · ₹40L - ₹50L / yr · Bootstrapped · Posted 22 Jul 2026

Senior Backend Engineer (Node.js, AI-Native Top Fintechp company only)
at Staffnixcom
What You'll Bring
• Experience: 6+ years building production backend systems in Node.js for B2C products at meaningful scale.
• System Design: This one matters a lot to us. You can reason clearly about scalability, reliability, and trade-offs under real constraints.
• Fundamentals: Strong grasp of API design, service-oriented architecture, data structures, algorithms, and clean code.
• Databases: Depth in SQL and/or NoSQL, data modeling, query optimization, and performance tuning.
• AI-Native: You already use LLMs and agentic approaches to maximize your own efficiency as an engineer.
• Mindset: You enjoy the pace and breadth of a small team, and you are happy picking up whatever moves the product

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Roles and Responsibility:
∙ Develop functional and fast-responsive web applications, using markup languages. ∙ Maintain websites.
∙ Elaborate mobile-based and web-based features.
∙ Troubleshoot apps for bugs.
∙ Fix bugs if necessary and improve usability.
∙ Improve apps for maximum speed.
∙ Troubleshoot UI and improve its performance accordingly.
∙ Employ the latest technology in order to re-built legacy apps.
∙ Integrate UI elements with server-side ones.
∙ Detect and fulfill front-end and back-end requirements.
∙ Perform training and support activities.
∙ Develop reusable code.
∙ Write comprehensive manuals, guides, and documents.
∙ Compile prototype and quality mockups.
∙ Make sure that high-quality graphic standards are met.
• Developing and maintaining all server-side network components.
• Creating database schemas that represent and support changing business processes thereby
ensuring optimal performance of the central database and responsiveness to front-end requests.
Integrating multiple data sources & databases in one system
• Collaborating with front-end developers on the integration of elements.
• Designing customer-facing UI and back-end services for various business processes.
• Developing & implementing low-latency & high-performance applications by writing testable,
reusable, and efficient code.
• Implementing User authentication and authorization between multiple systems, servers, and
environments
• Implementing effective security protocols, data protection measures, and storage solutions.
• Implementing automated testing platforms and unit tests. Running diagnostic tests, repairing
defects, and providing technical support.
• Documenting Node.js processes, including database schemas, as well as preparing reports.
• Recommending and implementing improvements to processes and technologies.
• Keeping informed of advancements in the field of Node.js development
Desired Candidate Profile :-
• Strong proficiency with JavaScript & ES6
• Good Knowledge of Node.js and frameworks available for it such as Express, HapiJS, Mongoose,
Sequelize, etc.
• Good understanding of server-side templating languages such as Handlebars, EJS, etc
• Good knowledge of MongoDB, its limitation and workarounds, replica sets, sharding, clustering
• Basic understanding of front-end technologies, such as HTML5, and CSS3
• Understanding the nature of asynchronous programming and its quirks and workarounds
• Understanding accessibility and security compliance
• 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
• Proficient understanding of code versioning tools, such as Git
• Proficient understanding of API testing tools, such as Postman
• Superb interpersonal, communication, and collaboration skills
• Exceptional analytical and problem-solving aptitude
Description:
1. Hands-on backend web and API development experience.
2. Has strong MySQL and Database knowledge.
3. Working experience in building and deploying applications on servers like AWS, etc.
4. Good understanding of architectural patterns (e.g., MVC) is required.
5. Good communication and analytical skills.
6. Experience in building REST APIs in NodeJS and/or TypeScript.
7. Code repositories management in GIT.
8. Provide leadership to the team around new approaches, workflows, and technologies.
9. Experience in client requirement analysis and estimating projects timeline and efforts.
Requirement:
- Hands-on experience with popular frameworks like Express / Loopback.
- Creating and Integrating backend REST APIs
- Hands-on experience with any RDBMS systems.
- Passionate about building complex systems.
- Should be able to understand project requirements thoroughly.
- A deep understanding of the importance of building maintainable, efficient, clean code, while balancing the urgency of business needs.
- Collaborative attitude and experience working with cross-functional teams.
Responsibilities -
- Responsible for driving & delivering web applications.
- Responsible for architecting, solutioning of the project in the requirement phase;
- Responsible for working with the team & enhancing the collaboration, adding value to the project with critical thinking on project design.
- Responsible for creating and integrating the REST APIs
Good to have -
- Experience with AWS / Azure.
- Experience with CI/CD too
Location: Bangalore
We are looking for the right Backend Developer.
What you will work on Build a scalable API platform that will enhance our customer experience & propel our logistics. You will be part of our Bangalore team of ambitious and talented engineers, who put their best together to build architecturally sound & scalable systems.
What can CasaOne promise you –
An opportunity to - increase your rate of learning exponentially by defining hard problems and solving them - partake in a high-growth journey and increase revenues 5x+ Y-o-Y - be an early innovator in the shifting trend: ‘ownership economy’ -> ‘access economy’ - build a category-defining platform for FF&E (Furniture, Fixture, and Equipment) leasing - build high-performance teams
The must-haves
• Bachelor’s or Master’s degree in engineering
• Good understanding of algorithms, data structures & design patterns
• A minimum of 4 years of work experience Experience required in
• Building distributed systems & service-oriented architecture
• Asynchronous programming, Test Driven Development (TDD)
• Writing (delightful) APIs & integration patterns
• RDBMS & NoSql databases
• Continuous integration & deployment (CI/CD) tools like git, Jenkins
• Cloud computing platforms - AWS/ Azure/ Google Cloud
Good to know CasaOne backend services are written in NodeJS. Experience in NodeJS will be handy, but it isn’t mandatory.









