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Senior MERN Developer (React.js + Node.js) at Proxify AB. Location Information: Anywhere in the World. . Headquarters:. Sweden . URL:. . http://career.proxify.io. . . 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) on the back end.. . Lead architectural discussions, write modular and well-documented TypeScript code, enforce strict testing protocols, and conduct thorough peer code reviews.. . Collaborate with cloud and DevOps engineers to containerize applications, set up automated deployment pipelines, and maintain system monitoring tools.. . . . . . What we offer:. . . . Get paid, not played. . No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options.. . . . Predictable project hours. . Enjoy a harmonious work-life balance with consistent 8-hour working days with clients.. . . . Flex days, so you can recharge. . Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify.. . . . Career-accelerating positions at cutting-edge companies. . Discover exclusive long-term remote positions at the world's most exciting companies.. . . . Hand-picked opportunities, just for you. . Skip the typical recruitment roadblocks and biases with personally matched positions.. . . . One seamless process, multiple opportunities. . A one-time contracting process for endless opportunities, with no extra assessments.. . . . Compensation. . Enjoy the same pay, every month with positions landed through Proxify.. . To apply:. . https://weworkremotely.com/remote-jobs/proxify-ab-senior-mern-developer-react-js-node-js.