
Senior backend developers
Minimum 5 years of experience
Backend skills: MongoDB, Node.js
Remote work available
(We prefer individual developers over agencies or IT providers)

About City Labs
About
City labs is a profitable company
Candid answers by the company
An all-in-one solution for the independent retailer:
- e-Commerce app
- Cashback loyalty program using our own CityCoin token
- Messaging
- and more
Company social profiles
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Responsibilities
Solve complex performance problems and architectural challenges
Build reusable code and libraries for future use
Build efficient, testable, and reusable Node JS modules
End-to-end ownership of modules, including designing, development, validation, deployment
Specifications:
Understanding the fully synchronous behavior of NODE JS.
Familiarity with One OOPS language
Familiarity with Workers/child processes & performance tuning
Experience with SQL/NoSQL databases and their declarative query languages (MySQL, and Mongo dB)
Strong knowledge of the common NODE JS or web server exploits and their solutions
Experience -
2-6 Year Qualifications Desired Skills NodeJS, HTML, CSS, Angular/React, JavaScript, Web Application Development, SQL/NoSQL
2. Design software and make technology choices across the stack (from data storage to application to front-end)
3. Understand a range of tier-1 systems/services that power our product to make scalable changes to critical path code
4. Own the design and delivery of an integral piece of a tier-1 system or application
5. Work closely with product managers, UX designers, and end users and integrate software components into a fully functional system
6. Work on the management and execution of project plans and delivery commitments
7. Take ownership of product/feature end-to-end for all phases from the development to the production
8. Ensure the developed features are scalable and highly available with no quality concerns
9. Work closely with senior engineers for refining and implementation
10. Manage and execute project plans and delivery commitments
11. Create and execute appropriate quality plans, project plans, test strategies, and processes for development activities in concert with business and project management efforts
Key Responsibilities:
- Rewrite existing APIs in NodeJS.
- Remodel the APIs into Micro services-based architecture.
- Implement a caching layer wherever possible.
- Optimize the API for high performance and scalability.
- Write unit tests for API Testing.
- Automate the code testing and deployment process.
Skills Required:
- At least 3 years of experience developing Backends using NodeJS — should be well versed with its asynchronous nature & event loop, and know its quirks and workarounds.
- Excellent hands-on experience using MySQL or any other SQL Database.
- Good knowledge of MongoDB or any other NoSQL Database.
- Good knowledge of Redis, its data types, and their use cases.
- Experience with graph-based databases like GraphQL and Neo4j.
- Experience developing and deploying REST APIs.
- Good knowledge of Unit Testing and available Test Frameworks.
- Good understanding of advanced JS libraries and frameworks.
- Experience with Web sockets, Service Workers, and Web Push Notifications.
- Familiar with NodeJS profiling tools.
- Proficient understanding of code versioning tools such as Git.
- Good knowledge of creating and maintaining DevOps infrastructure on cloud platforms.
- Should be a fast learner and a go-getter — without any fear of trying out new things Preferences.
- Experience building a large scale social or location-based app.

Job Description:
As a MERN Full Stack Developer, you will be responsible for developing and maintaining web applications using the MERN (MongoDB, Postgresql, Express.js, React, Node.js) stack. You will work closely with our product and design teams to build high-quality, scalable, and efficient solutions.
Key Responsibilities:
- Develop and Maintain Web Applications: Design, develop, and deploy full-stack web applications using the MERN stack.
- API Development and Integration: Create and integrate RESTful APIs.
- Database Management: Design and manage databases using MongoDB.
- Code Quality and Testing: Write clean, maintainable, and efficient code. Implement unit tests and integration tests.
- Collaborate with Cross-functional Teams: Work closely with product managers, designers, and other developers to deliver high-quality products.
- Performance Optimization: Identify and implement performance improvements for existing applications.
- Stay Updated with Industry Trends: Keep abreast of latest trends and technologies in web development.
Required Qualifications:
- Experience: 3-4 years of professional experience as a Full Stack Developer.
- Technical Skills:
- PostgreSQL: Proficient in database design, indexing, and performance optimization.
- Express.js: Solid experience in building and managing APIs and middleware.
- React: Strong knowledge of React and related libraries (Redux, React Router, etc.).
- Node.js: Expertise in server-side development and asynchronous programming.
- HTML/CSS: Proficient in web markup and responsive design.
- JavaScript/TypeScript: Advanced proficiency in JavaScript and TypeScript.
- Version Control: Experience with Git and Git workflows.
- Soft Skills:
- Strong problem-solving abilities and analytical skills.
- Excellent communication and teamwork skills.
- Ability to work in a fast-paced environment and manage multiple tasks.
- Attention to detail and a commitment to delivering high-quality work.
Preferred Qualifications:
- Experience with cloud services (AWS, Azure, Google Cloud).
- Familiarity with CI/CD pipelines.
- Experience with Docker and container orchestration (Kubernetes).
- Knowledge of GraphQL.
- Prior experience in Agile/Scrum development methodologies.
Benefits:
- Competitive salary and benefits package.
- Opportunity to work with a talented and diverse team.
- Professional development opportunities.
At Qiro, we are a dynamic team united by a mission to foster a fair, transparent, and decentralized global lending market. Our focus lies in developing an institutional private credit protocol that seamlessly connects on-chain lenders with off-chain borrowers.
What we’re looking for:
Currently, we are seeking a Senior Backend Engineer to take charge of designing, developing, and maintaining our backend systems. As a pivotal team member, you will play a key role in ensuring the resilience, scalability, and security of our systems. You’ll collaborate closely with cross-functional teams, including smart contract developers, frontend developers, product managers, and designers, to deliver high-quality software solutions that drive our success.
What You'll Do:
- Build and contribute to backend systems supporting Qiro products, interacting with different blockchain networks and external systems.
- Design and develop scalable and resilient client-facing backend APIs, internal services, and scripts for efficient execution of business logic.
- Architect and implement scalable backend solutions capable of handling growing user loads and evolving business requirements.
- Develop and maintain comprehensive test suites, including unit tests, integration tests, and end-to-end tests, to ensure the reliability of backend systems.
- Implement monitoring and debugging tools to proactively identify and resolve issues, ensuring high system availability.
- Collaborate with engineers, QA, and DevOps teams to deliver high-quality code within project timelines.
- Document code, APIs, and technical processes to facilitate knowledge sharing within the team and support the onboarding of new developers.
What Makes a Great Candidate:
- Strong experience in Node.js and Typescript, with proficiency in frameworks like ExpressJS (additional stacks may be used based on project requirements).
- Previous work experience in the blockchain/DeFi space, demonstrating a strong technical understanding of the EVM ecosystem.
- Proven expertise in developing backend REST APIs at scale, handling high request volumes while maintaining low latency and optimal system performance.
- Extensive professional experience in software design and architecture.
- Deep knowledge of testing frameworks and principles.
- Passion for exploring new technologies and the ability to autonomously evaluate them, making suggestions for improvement.
Nice to Have:
- Bachelor’s or Master’s degree in Computer Science.
- Smart contract development experience.
- Understanding of real-world asset tokenization on-chain.
Benefits:
- Competitive salary with regular reviews.
- Flexible remote work.
- Flexible working hours.
- Opportunities for professional growth—your success has no limits when you're driven to excel.
If you are excited about the prospect of contributing to our mission and possess the skills and passion we're looking for, we invite you to be a part of our innovative journey at Qiro. Apply now to join a team where success knows no bounds!
Have an experience building backend server side applications in Node.js and Express.js Have in-depth knowledge and experience of using ES6+ features and Object Oriented Principles Have sound knowledge and are familiar with databases like MongoDb - (Preferred) and Mysql. Have good exposure to cloud native technologies (AWS Lambda, S3, RDS, etc) Have working knowledge of version control (Git) and continuous deployment Have experience in optimising backend API’s and database queries for optimal performance. You are good at problem solving and have analytical skills You are flexible in adapting new technologies and frameworks as per the projects needs



- At TailNode, we are at the bleeding edge of this change.
- We conceptualize and develop products that are aimed to enable this transformation of the political architecture of the country.
- We leverage the best practices and insights of the technology world and apply them in our unique way to deliver impact on a massive scale.
- We want to offer you a once-in-a-lifetime opportunity to be a part of this massive change and build new and exciting products with us.
Responsibilities :
- Designing, building, and maintaining high performance, reusable, scalable and robust services and applications
- Developing and managing databases and reporting tools
- Building intelligent messaging bots using web APIs
- Designing and developing robust RESTful APIs and other interfaces
- Integrating data storage solutions.
Required Skills :
- Ability to write clean, structured code in Ruby/Python with documentation.
- Proficiency in at least one Ruby frameworks (Ruby on Rails or Sinatra) or Python framework (Django or Flask)
- Clear understanding of Data Structures and Algorithms.
- Ability to write well defined test cases using Minitest, RSpec or Unit testing framework.
- Experience in one of the following database technologies - MySQL, PostgreSQL, MongoDB, Cassandra.
- Proficiency in working with complex SQL queries.
- Knowledge of design patterns, architectural best practices.
- Familiarity with RESTful web services.
- Knowledge of version control tools like Git, SVN etc.
- Working experience with Cloud Services like Amazon Web Services or Google Cloud is a plus.
Required Qualifications :
- A Bachelors or a Masters degree in Computer Science or relevant field.
- Experience of 3-5 years in software development.
Note : Other language candidates may apply only if they're expecting to work primarily on Ruby/Python.



