Senior MERN Developer (React.js + Node.js)

Job Description

Remote Senior MERN Developer (React.js + Node.js) at Proxify AB Find Jobs Top 100 Remote Companies Top Trending Remote Jobs New! Search by Job Category Programming Full-Stack Programming Front-End Programming Back-End Programming Software Development Design All Design Jobs Product Design UX/UI Design Devops and Sysadmin Management and Finance Product Customer Support Sales and Marketing Search by Role Type Full-Time Contract Community Blog Podcast Remote Work Trends Remote Work Community New! Career Services Free ATS Resume Review Online Courses New! AI Job Search About Why Choose WWR? Mega Placements New! Save with Bundles Frequently Asked Questions Sign in Post a job Sign in Jobs Top Trending Remote Jobs New! All Jobs Search by Vertical Programming Full-Stack Programming Front-End Programming Back-End Programming Software Development Design All Design Jobs Product Design UX/UI Design Devops and Sysadmin Management and Finance Product Customer Support Sales and Marketing Search by Engagement type Full-Time Contract All Other Jobs Top 100 Remote Companies Community Blog Podcast Remote Work Trends Remote Work Community New! Career Services Free ATS Resume Review Online Courses New! AI Job Search About Why Choose WWR? Mega Placements New! Frequently Asked Questions Save with Bundles Post a job × All jobs All Other Remote Senior MERN Developer (React.js + Node.js) Senior MERN Developer (React.js + Node.js) Posted 8 days ago About us: Talent has no borders. Proxify's mission is to connect top developers around the world with the opportunities they deserve. So, it doesn't matter where you are; we are here to help you fast-track your independent career in the right direction. Since our launch, Proxify's developers have successfully worked with 1200+ happy clients to build their products and growth features. 5000+ talented developers trust Proxify and its network to fulfill their dreams and objectives. Proxify is shaped by a global network of supportive, talented developers interested in remote full-time jobs. Our Glassdoor (4.5/5) and Trustpilot (4.8/5) ratings reflect the trust developers place in us and our commitment to our members' success. Apply now AI Auto-Apply Save job The Role: We are looking for a Senior MERN Stack Developer with heavy specialization in React.js and Node.js on behalf of one of our high-growth clients to architect, scale, and maintain high-throughput web applications. In this role, you will take operational ownership of both front-end user interfaces and back-end microservices, delivering seamless, secure, and responsive digital products. You will bridge user-facing features with complex database architectures and cloud infrastructure. You are a perfect candidate if you are growth-oriented, you love what you do, and you enjoy working on new ideas to develop exciting products What we are looking for: 5+ years of professional software engineering experience designing, building, and deploying end-to-end applications using MongoDB, Express.js, React.js, and Node.js. Deep proficiency in modern JavaScript (ES6+), TypeScript, asynchronous programming, event loops, and memory management across client and server environments. Deep mastery of React internals, custom hooks, component design patterns, state management (Redux Toolkit, Zustand, or React Query), SSR/SSG frameworks (Next.js is a strong plus), and performance optimization (virtualization, code splitting, Web Vitals). Proven experience architecting scalable RESTful APIs, WebSockets, and/or GraphQL services. Proficiency with middleware design, authentication protocols (JWT, OAuth2, Passport.js), and event-driven architectures. Advanced knowledge of MongoDB schema design, aggregation pipelines, index strategy, performance tuning, and ORMs/ODMs like Mongoose or Prisma. Strong commitment to test-driven development using frameworks like Jest, React Testing Library, and Cypress, alongside hands-on experience with Docker, CI/CD pipelines (GitHub Actions), and AWS cloud services. Time zone: CET (+/- 3 hours). We are unable to consider applications from candidates in other time zones. Nice-to-have: Experience with Next.js or Remix for production-grade full-stack React frameworks. Familiarity with relational databases (PostgreSQL, MySQL) alongside MongoDB. Experience with vector databases or AI model integration into Node.js backend services. Exposure to micro-frontends or monorepo setups (Turborepo, Nx). Responsibilities: Design, develop, and deploy scalable full-stack features from initial database schema creation down to polished, pixel-perfect React interfaces. Build secure, high-concurrency microservices and web services, managing integrations with third-party APIs, webhooks, and real-time communication channels. Audit, profile, and optimize application throughput—reducing bundle sizes and rendering overhead on the front end while optimizing database queries and caching layers (Redis