As a Senior MERN Stack Engineer at PartsMojo, you will spearhead the design, development, and optimization of full-stack web applications that power our innovative automotive parts marketplace. Working within an agile, cross-functional team of product managers, designers, and fellow engineers, you will translate complex business requirements into scalable, high-performance solutions using Node.js, React.js, Next.js, TypeScript, Express.js, and MongoDB.

A key part of this role involves building highly responsive, user-friendly interfaces that work seamlessly across devices, including desktops, tablets, and mobile screens. You should be comfortable implementing multi-screen layouts, adaptive UI components, and pixel-perfect designs based on modern UI/UX standards.

You will mentor junior developers, champion best practices in code quality, testing, and continuous integration, and actively contribute to architectural decisions that shape the platform’s future. The role offers a dynamic environment that encourages continuous learning, exposure to cutting-edge technologies, and the opportunity to make a measurable impact on the efficiency and user experience of a rapidly growing e-commerce ecosystem.

Requirements:

• 4–5 years of professional experience developing and deploying MERN stack applications, with a strong focus on Node.js, React.js, Next.js, and MongoDB.
• Proficiency in JavaScript/TypeScript, RESTful APIs, Redis, and modern front-end tooling (Webpack, Babel, ESLint).
• Strong experience in responsive web design, cross-browser compatibility, and building multi-device / multi-screen layouts.
• Hands-on experience with modern CSS frameworks/libraries (Tailwind CSS, Material UI, Bootstrap) and layout techniques (Flexbox, Grid).
• Hands-on experience with cloud platforms AWS, Docker, CI/CD pipelines, and version control (Git) is an added advantage.
• Solid understanding of software design patterns, microservices architecture, and performance optimization techniques.
• Excellent problem-solving abilities, effective communication skills, and a collaborative mindset for working in fast-paced, multidisciplinary teams.

Roles and Responsibilities:

• Architect, develop, and maintain end-to-end web applications using Node.js, React.js, Next.js, and MongoDB, ensuring high availability and scalability.
• Build and maintain responsive, high-performance user interfaces that deliver consistent experience across desktop, tablet, and mobile devices.
• Implement multi-screen layouts and reusable UI components ensuring usability, accessibility, and performance.
• Lead code reviews, enforce coding standards, and mentor junior engineers to foster a culture of quality and continuous improvement.
• Design and implement RESTful and GraphQL APIs, integrating third-party services and internal microservices securely.
• Optimize application performance through profiling, caching strategies, and efficient database queries.
• Collaborate with product and design teams to translate user stories into technical specifications and deliver features iteratively.
• Set up and maintain CI/CD pipelines, automated testing suites, and monitoring tools to streamline deployment and ensure reliability.
• Participate in sprint planning, retrospectives, and technical roadmap discussions to align engineering efforts with business goals.