MERN Stack Developer

Position: Full Stack Developer (React.js + Node.js)

Experience: 2–5 Years

Location: Mumbai – Chembur West (Onsite)

Job Summary

We are looking for a Full Stack Developer with strong hands-on experience in React.js and Node.js to build scalable, secure, and high-performance web applications. The ideal candidate should be comfortable owning features end-to-end, developing responsive UI, building REST APIs, integrating databases, and supporting production systems.

Key Responsibilities

• Build responsive UI using React.js, HTML5, CSS3, JavaScript (ES6+)
• Develop scalable backend services and RESTful APIs using Node.js (Express.js / NestJS)
• Work with MongoDB and MySQL (schema design, indexing, query optimization)
• Implement authentication & authorization using JWT , RBAC , Oauth
• Integrate third-party APIs, Webhooks
• Build real-time features using Socket.io / WebSockets
• Ensure performance, scalability, and security (validation, sanitization)
• Implement caching using Redis (if applicable) and optimize API response times
• Support API testing (Postman/Supertest)
• Maintain API documentation using Swagger / OpenAPI
• Debug and resolve defects, handle RCA, and support production troubleshooting with logs/monitoring
• Follow Git-based workflows, participate in code reviews, and collaborate with QA/product teams in Agile delivery

Mandatory Skills

• React.js, Node.js, JavaScript (ES6+)
• MongoDB (must), MySQL
• REST API development & integration
• Socket.io / WebSockets, Webhooks
• HTML5, CSS3
• Git
• Typescript, Express.js / NestJS
• jQuery / AJAX (basic / legacy support)

Good to Have

• Redis, Swagger/OpenAPI
• Docker, CI/CD (GitHub Actions/Jenkins)
• Cloud exposure (AWS/Azure/GCP)

Qualification

BE / BTech / MCA / MSc IT / BSc IT with 2–5 years relevant experience.

CTC: As per industry std.

What You’ll Do:

We’re looking for a Full Stack Software Engineer to join us early, own critical systems, and help shape both the product and the engineering culture from day one.

Responsibilities will include but are not limited to:

• Own end-to-end product development, from user experience to backend integration
• Build and scale a modern SPA using React, TypeScript, Vite, and Tailwind Design intuitive, high-trust UIs for finance workflows (payments, approvals, dashboards)
• Collaborate closely with backend systems written in Go via well-designed APIs
• Translate product requirements into clean, maintainable components and state models
• Optimize frontend performance, bundle size, and load times for complex dashboards
• Work directly with founders and design partners to iterate rapidly on product direction
• Establish frontend best practices around architecture, testing, and developer experience
• Contribute across the stack when needed, including API design and data modeling discussions.

What You’ll Need:

• Strong experience with Go in production systems
• Solid backend fundamentals: APIs, distributed systems, concurrency, and data modeling
• Hands-on experience with AWS, including deploying and operating production services
• Deep familiarity with Postgres, including schema design, indexing, and performance considerations
• Comfort working in early-stage environments with ambiguity, ownership, and rapid iteration
• Product mindset — you care about why you’re building something, not just how
• Strong problem-solving skills and the ability to make pragmatic tradeoffs

Set Yourself Apart With:

• Experience with Tailwind or other utility-first CSS frameworks
• Familiarity with design systems and component libraries
• Experience building fintech or enterprise SaaS UIs
• Exposure to AI-powered UX (LLM-driven workflows, assistants, or automation)
• Prior experience as an early engineer or founder
• product engineering culture from the ground up.

Full Stack senior developer with ReactJS & Redux

Qualifications:

3 - 4 years of experience in application development and maintenance

Bachelor’s Degree/B.Tech/B.E in Computer Science or a related discipline

Advanced knowledge of HTML and CSS

Experience with using and building automated tests

Experience with CI/CD tooling (at least Git and Jenkins)

Experience with the Agile/Scrum/Kanban way of working

Proficient understanding of code versioning tools, such as Git

Experience with a modern frontend framework (e.g. Polymer, Redux, React, Angular, Vue.js or other component-based frameworks)

Experience with web paradigms such as REST, Responsive Web Design, Test-driven Development (TDD), Dependency Injection, etc.

Experience with common front-end development tools such as Babel, Webpack, NPM, etc.

Knowledge of performance testing frameworks including Mocha and Jest.

Knowledge of RESTful APIs.

Understanding of AWS, S3, API Gateway, DynamoDB, RDS, Lambda.

About Us

Zentosys Solutions Pvt. Ltd. is a technology-driven IT services company specializing in modern web and mobile application development. We empower businesses worldwide with innovative, scalable, and efficient software solutions. Be a part of our dynamic team and contribute to building impactful digital products.

Responsibilities

• Develop, maintain, and optimize full-stack applications using modern technologies.
• Implement backend logic using Node.js, TypeScript, and frameworks like Express.js or NestJS.
• Build intuitive, responsive, and high-performance frontend applications using React.js, Next.js, or similar frameworks.
• Design and integrate RESTful APIs and ensure seamless communication between front-end and back-end systems.
• Utilize CI/CD pipelines for automated deployment and continuous integration.
• Manage and optimize cloud infrastructure using AWS services.
• Debug, troubleshoot, and ensure application reliability and performance across the stack.
• Design database schemas and manage MongoDB for efficient data handling.
• Collaborate with cross-functional teams, including DevOps, designers, and product managers, to deliver high-quality solutions.
• Stay updated with the latest technologies, frameworks, and best practices in software development.

Requirements

• Experience: 2+ years in full-stack development.
• Strong expertise in Node.js, TypeScript, and backend frameworks like Express.js, NestJS, or Fastify.
• Proficiency in frontend technologies like React.js, Next.js, HTML5, CSS3, and JavaScript (ES6+).
• Hands-on experience with CI/CD pipelines and tools such as Jenkins, GitHub Actions, GitLab CI, or similar.
• Practical knowledge of AWS services, including EC2, S3, RDS, Lambda, and IAM.
• Experience with database schema design and management using MongoDB.
• Strong problem-solving skills with a logical and analytical approach to challenges.
• Familiarity with Git for version control and collaboration in a team environment.
• Excellent communication and teamwork skills to contribute effectively in a collaborative setting.

Preferred Skills

• Exposure to GraphQL for API development.
• Knowledge of Docker and container orchestration.
• Familiarity with Serverless Framework for deploying cloud-native applications.
• Experience with testing frameworks like Jest, Mocha, or Cypress.
• Understanding of state management libraries like Redux, Zustand, or similar.
• Hands-on experience with Terraform or other infrastructure-as-code tools.

What We Value

• Problem Solvers: Professionals who can tackle challenges with creativity and precision.
• Team Players: Individuals who thrive in a collaborative, dynamic environment.
• Growth Mindset: Developers who are eager to learn, adapt, and grow with the organization.

What We Offer

• Competitive salary in the range of ₹6 LPA to ₹15 LPA based on skills and experience.
• Work on diverse and impactful projects for a global clientele.
• A culture that encourages innovation, professional growth, and skill enhancement.
• Flexible working hours and a healthy work-life balance.
• Exposure to cutting-edge technologies and tools.

Job Type: Full-time

Pay: ₹600,000.00 - ₹1,500,000.00 per year

Benefits:

• Provident Fund

Schedule:

• Monday to Friday

Education:

• Bachelor's (Required)

Experience:

• Full-stack development: 2 years (Required)

Work Location: In person

Expected Start Date: 05/02/2025

Job Description

• Gather and analyse information on existing business processes in order to make
• recommendations that seek to improve business systems and processes.
• Analyse and document requirements for enhancements to systems and / or business
• processes. May involve investigation of third-party vendors or systems.
• Clearly document solutions and recommendations to business problems
• Review requirements and designs with relevant stakeholders to obtain agreement and sign off proposals.
• Create cost and time estimates along with project plans to enable prioritization and execution of work.
• Assist and/or coordinate user testing, ensuring issues are resolved in a pragmatic and appropriate manner.
• Assist the design and implementation of ongoing support arrangements for delivered systems.
• Work as part of a project team, reporting progress and escalating issues to project management in a timely manner to ensure successful completion of projects / reviews.
• Complete all tasks related to technical analysis, building and unit testing, quality assurance,
• system test and implementation in accordance with the IT development life cycle.
• Provide post implementation support.
• Create and maintain documentation for systems and processes.
• Adhere to standards set by the Invesco project methodology.
• Contribute the improvement of the existing processes.
• Assist with developing improvements to team processes and procedures.
• Provide On Call support for systems based on agreed coverage timeframe.

• 5-6 years of ASP.NET, C#, HTML5, CSS3, JavaScript and SQL Server, AWS and Microservices
• 3+ years technical leadership and architecture experience in software development
• 4+ years working in SQL-backed environments.
• 3+ knowledge of client-side JavaScript frameworks like React and Redux
• In depth knowledge of REST services (WCF, Web API, Microservices)
• In depth knowledge of Solid work experience in building SaaS based products.
• Experience and clear understanding of how to plan and execute within iterations and sprints.
• Experience working in an Agile/Scrum development process.
• Innovative, challenging programming work in the Microsoft stack, with SQL Server as a back end
• Ability to work independently with the knowledge and capability to come in and make an immediate impact.
• Experience working in a sprint-driven development process.

• Web Apps built with .NET, using both Web Forms and MVC
• APIs built on .NET (C# / REST services)
• SQL Server 2014
• Cloud : AWS
• UI: in depth knowledge on client side JavaScript framework like React
• Experience on DevOps tools

• FORMAL EDUCATION:
• A Bachelor’s Degree in Management Information Systems or Computer Science is preferred or
• commensurate relevant work experience