MEAN Stack Developer

MERN Stack Developer

Location: Surat, Gujarat (No WFH )

Job Summary:

We are looking for a Full Stack Developer (MERN) with hands-on experience in building highly scalable, performance-driven applications. The ideal candidate should have a deep understanding of both front-end and back-end development, microservices, and database optimization for large-scale systems. You will be responsible for designing, developing, and maintaining applications that can handle high concurrency (1,000+ active users) while ensuring performance, reliability, and scalability.

This role involves working closely with cross-functional teams — including product managers, designers, and DevOps engineers — to deliver cutting-edge, enterprise-grade solutions.

Roles & Responsibilities:

• Design and develop scalable and distributed web applications using the MERN stack (MongoDB, Express.js, React/Next.js, Node.js).
• Build and optimize RESTful APIs for high-performance, concurrent environments.
• Architect and manage MongoDB databases, ensuring high availability, efficient query performance, and scalability.
• Implement queueing systems (e.g., BullMQ, RabbitMQ, Kafka, or Redis Queues) for background jobs and asynchronous processing.
• Optimize server and client performance to support real-time data updates and high concurrent user loads.
• Collaborate with DevOps to improve deployment pipelines, containerization (Docker), and cloud scalability.
• Conduct thorough testing, profiling, and debugging to identify performance bottlenecks and optimize both code and infrastructure.
• Participate in code reviews, architecture discussions, and sprint planning to ensure technical excellence and scalability across all layers.

Qualification / Requirements:

• Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience).
• 1 + years of hands-on experience in full-stack development using the MERN stack.
• Proven experience working on applications supporting 1,000+ concurrent users or large-scale distributed systems.
• Strong expertise in:
• Node.js (asynchronous programming, clustering, performance optimization)
• Next.js & React.js (SSR, CSR, and dynamic rendering)
• MongoDB (aggregation pipelines, indexing, schema design for scalability)
• Practical experience with message queues (BullMQ, RabbitMQ, Kafka, or Redis Streams).
• Familiarity with caching mechanisms (Redis, Memcached) to optimize performance.
• Experience with Docker and microservices-based architectures is a plus.
• Good understanding of API design, authentication mechanisms (JWT, OAuth), and security best practices.
• Experience working in Agile environments and using Git-based version control.

Nice to Have:

• Exposure to serverless computing (AWS Lambda).
• Experience with monitoring tools (New Relic, Datadog, ELK Stack).
• Knowledge of CI/CD pipelines and automated deployment workflows.
• Experience in real-time communication (WebSockets, Socket.io).

Technical Lead

The ideal candidate should possess the following qualifications:

• Education: Bachelor's degree in Computer Science, Software Engineering, or a related field.
• Experience: 9+ years in software development with a proven track record of delivering scalable applications.
• Leadership Skills: 4+ years of experience in a technical leadership role, demonstrating strong mentoring abilities.
• Technical Lead must Lead and mentor a team of software developers and validation engineers.
• Technical Skills: Technical Lead must have Proficiency in programming languages such as C#, React js, SQL, MySQL, Javascript, Web API are required .NET, or Python, along with frameworks and tools used in software development.
• Technical Lead must have General working knowledge of Selenium to support current business automation tools and future automation requirements.
• General working knowledge of PHP desired to support current legacy applications which are on the roadmap for future modernization.
• Technical Lead must have Strong understanding of software development lifecycle (SDLC).
• Experience with agile methodologies (Scrum/Kanban or similar).
• Knowledge of version control systems (Git or similar).
• Development Methodologies: Experience with Agile development methodologies and experience with CI/CD pipelines.
• Problem-Solving Skills: Strong analytical and problem-solving abilities that enable the identification of complex technical issues.
• Collaboration: Excellent communication and collaboration skills, with the ability to work effectively within a team environment.
• Innovation: A passion for technology and innovation, with a keen interest in exploring new technologies to find the best solutions.

• Hands-on expertise in managing technical teams and work closely with business stakeholders
• Should be familiar with card testing and POS ecosystem.
• Experience with designing APIs and building platform integrations in Commerce, POS, FinTech and Payments
• Payment’s domain experience.
• Extensive experience on Base24 & SWITCH part for payment format.
• Exposure on ISO8583 Messaging system.
• API understanding and creation.
• Working knowledge on cryptographic algorithms (RSA, EC, AES, SHA variants), TLS/SSL protocols. C Symetric and A symetrics, K.M.S.
• Digital Payments technical knowledge - QR/ POS/ UPI/ BQR
• Understanding of CI/CD pipelines, Kubernetes, containerization, Docker
• Must have strong technical skills in Android APK and iOS development Concept and Web services.
• Supportability, monitoring, ops in general.
• Accurate cost models to deploy and operate
• Extensive experience in TLOG’s, data integration with downstream applications, and impact of POS changes on different financial, legal, compliance, loss prevention, etc. applications.
• Extensive experience with payment systems 7861 (EMV, payment middleware, encryption, tokenization, settlement, offline scenarios,).
• Extensive experience with different types of payment methods including credit, debit, gift cards (Both closed loop and open loop), PLCC, PayPal, AliPay, checks, etc. as well as different payment form factors like Tap N Go, contactless, swipe, EMV, Mobile, etc.
• Extensive experience with payment devices (pin pads, printers, registers, scanners).
• Experience in Node.js / Java / Python, building REST APIs, with experience/exposure to front end stack like JavaScript & React / Angular. 
• Experience with Storage systems - RDBMS, NoSQL (Cassandra/MongoDB), Redis/Memcache/Aerospike.
• Experience in messaging tools like Kafka/AWS Kinesis etc...
• Design expertise for performance, scalability, fault tolerance and high availability

• Experience with POS systems and Payments domain.
• Demonstrated experience for systems architecture, design, and integration for POS systems
• Java and/or Node.js. Experience building micro services (REST APIs) using Node.js
• Experience with one or more RDBMS databases like MySql, PostGreSQL
• Experience with one or more NoSQL databses like MongoDB, Cassandra, DynamoDB, Aerospike, Elastic Search, Redis, neo4j etc.,
• Caching technologies like: Redis, Elasticache,
• Cloud Providers like: AWS/ Google Cloud / Azure
• CI / CD : Jenkins, Docker, Kubernete
  

Hashtag Labs is looking for MERN stack developer who is an expert in MongoDB, Express, React and Node. He/she should be proficient in JavaScript and use HTML, CSS and JavaScript to handle front-end operations and JavaScript with Node.js to handle back-end operations.

Roles and Responsibilities:-

• Ability to translate Wireframes into functional web apps.
• Binding of UI elements to JavaScript object models
• Creating RESTful services with Node.js
• MERN stack developer must have proven experience in front & back-end development
• Work in a cross-functional team to deliver a complete user experience
• React.JS NodeJS developer must know MongoDB, Express, Node.js, & React.
• Create Unit and Integration tests to ensure the quality of code
• Be responsive to change requests and feature requests
• Write code that is cross-platform and cross-device compatible
• MERN full stack developer must have the ability to wear many hats and learn new technologies quickly
• For MERN stack developer job, candidate must have good Knowledge of Node Debugging
• Understanding & proficiency in REST APIs.
• MERN stack developers should know Git Repository and Jira.
• Integration of data storage solutions [RDBMS, NoSQL DB]

Experience: 2+ years

Job Location: Lucknow, Uttar Pradesh

Quoality- A Modern Operating Infrastructure for Hospitality Businesses to help them improve the guest experience and generate additional revenue.

Launched in 2021, Quoality is a Hospitality Tech company backed by a US-based Newchip Accelerator. Our mission is to equip businesses with the tools they need to grow. 

By providing tools, insights, and education with minimal effort on the business's part, the barrier to making actionable business decisions is lowered dramatically. Everything we do is driven by this mission. Everything we do needs to positively answer the question, "Does this help businesses grow?"

Product Demo: https://www.youtube.com/watch?v=gKklkRYKkC4" target="_blank">https://www.youtube.com/watch?v=gKklkRYKkC4

Quoality Blogosphere: https://medium.com/quoality" target="_blank">https://medium.com/quoality

Oh, this is our favorite part. We’ve seen companies that write 'templatized' BS for this section; stuff that’s never followed in reality.

Not us. Here are some of our core values to give you a sense of who we are as a team:

• First and foremost, we’re super transparent. We all know what everyone’s working on, how’s the company doing, and the whole shebang.
• We’re all super chill. 
• Work time ain’t playtime. We take our work very seriously. We’re a small bunch on a mission to change the guest experience in the hospitality industry, once and for all.
• Deadlines are a thing for us. We are super punctual.
• We know what we are working on and aren’t clueless.
• We’re more friends than colleagues.
• Monthly 1:1s with the founders where you can directly share & receive feedback.

Not convinced yet? Okay, here’s the fun stuff:

• Flexible leave policy. Yeah, it’s truly flexible. We trust you.
• We have a flexible remote work policy in India.  Work from the beautiful beaches of Goa or the stunning mountains of Manali, and we’re all good.
• Annual workstations at exotic destinations. Subject to change and hitting milestones.
• Allowances to choose your coworking space (if you want), courses & any tool that you think is beneficial to succeed in this role.

• Write code that will impact the businesses of thousands of hotels, hostels, and vacation homes across the globe.
• Collaborate with Frontend to spec, write, test, and deploy API endpoints.
• Implementation of a robust set of services and APIs that work on our data pipelines.
• Build all support infrastructure to scale our data delivery pipelines - endpoints, security, logging, messaging.
• Product development activity includes data querying from our various stores, real-time analytics, and ML algorithms.
• Developing & Integrating of the front-end and back-end aspects of the web application
• Optimization of the application for maximum speed and scalability.
• Brainstorm features with the product team and guide decisions based on your knowledge of the codebase.
• Take full ownership of the module starting from architectural and design decisions to shipping.
• Like the work you do, enjoy collaborating with your coworkers, communicate as much as you can, and have fun. 

• 2+ years of relevant work experience
• You are well versed in building scalable, understandable, and testable code with an eye toward maintainability.
• You have a good understanding of multi-process architecture and the threading limitations of NodeJs and ReactJs.
• Understanding of fundamental design principles behind a scalable application.
• You have good knowledge of relational databases as well as key-value databases and are capable of designing scalable database models based on the product requirements.
• Familiarity with REST API development standards, protocols (HTTP, WebSockets and more), and GraphQL.
• Understanding differences between multiple delivery platforms (such as mobile vs, desktop), and optimizing outputs.
• You possess strong computer science fundamentals: data structures, algorithms, distributed systems, and information retrieval.
• You’re comfortable picking up new stacks and choosing the right tool to get the job done.
• You are open to learning new stuff and avoiding internal politics. (super important).
• You are humble, kind, and open to feedback. (super duper important).

• Entrepreneurial spirit, Product Thinker, and ‘Can-Do' attitude.
• Passionate about leveraging technology for supporting product delivery in the Hospitality space.
• The operating style is suited to working in a startup environment, where teamwork and resourcefulness are highly valued.
• Excellent leadership skills, including the ability to manage multiple assignments at a time.

Yes, we do have a process, and it’s simple.

• Step 1: You apply for the job.
• Step 2: Quick intro call with the founders.
• Step 3: Solve an assignment.
• Step 4: A round where we evaluate your assignment along with you.
• Step 5: One round of interviews to gauge if you are a good culture fit.
• Step 6: Job Offer (contingent on the above steps).
• Step 7: Welcome to the Quoality! 🙂

• Must have 3+ years of hands-on experience in web development using core PHP,Wordpress, CodeIgniter etc
• Must have hands-on experience in front-end using JavaScript (ES6+), HTML, CSS etc.
• Must have experience with design patters such as RESTful, AJAX, and jQuery
• Experience in building responsive web pages
• Proficient understanding of code versioning tools, such as Git
• Should have working knowledge of MySQL database system
• Should have basic programming skills using object-oriented programming (OOP) languages with in-depth knowledge of common APIs and data structures

• Write well designed, testable, efficient quality code.
• Ensure designs are in compliance with specifications.
• Developing and implementing strong algorithms/techniques for solving problems in a
• Frameworks are good, but you should be able to function without them.
• Test and deploy applications and systems.
• Revise, update, refactor, debug code and improve existing software.

The Technical Lead should be well versed with Node.js, React js, AWS, Microsoft Azure, flutter, scalable cloud architecture.

He/she will be working directly under the CEO and will act as both a technology and business expert, making decisions that will impact the current and future operations of the company. 

Responsibilities:

• Setting a vision for how technology will be used in the company.

• Ensuring that the tech team meets the company’s short and long term needs.

• Outline the goals for research and development. 

• Creating timelines for the development and deployment of all product requirements. 

• Acting as a mentor to the tech team members. 

• Maintaining a consumer-focused outlook and aiding in the delivery of new features.

• Managing technology budgets and time frames.

• Driving and planning sprints and ensuring a high tech team velocity.

• Staying on top of technology trends and developments.

• Ensuring all technology practices adhere to regulatory standards.

• Ensuring that there is no system downtime and all products are working seamless.

Requirements /Qualifications:

• Exceptional communication skills (both verbal and written). 

• Self-motivated with diligent work ethic, a business acumen, enthusiastic and passionate, exceptional team management skills. 

• Should be well versed with Node.js, React js, AWS, Microsoft Azure, flutter, scalable cloud architecture.

• Extensive industry knowledge with an eye towards the future.

• Proactive and efficient time management.

• Ability to delegate efficiently. 

• Should have managed and set up teams. 

• Process orientation.

• 5+ years of experience as an Engineering head.
  
  Salary will be based upon industries standard 

• Front-end skills (HTML5, CSS3, JavaScript, ES6+, Ajax);
• 3+ years working with React/Redux + Typescript front-end applications
• Must have experience technologies like Python, React, node.js, PostgreSQL, AWS
• Experience with centrally managed state (Redux) and React Router
• Experience with data structuring libraries (Immutable.js / Immer)
• Experience of TDD/BDD, QA/Test frameworks such as Selenium, load testing (Blazemeter), unit testing (Mocha/Chai/Jest) etc.
• Experience optimising the performance of front-end applications
• A good understanding of agile development practices and common methodologies
• Experience building responsive, cross browser compatibility websites and applications
• Experience of integrating with web services and APIs, including REST endpoints.
• Experience using code version control systems (GIT) and CI/CD.