Senior MERN Developer (React.js + Node.js)
Job Overview
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.
Job Description
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.
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.
Key Responsibilities
- 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).
- 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.
- Lead architectural discussions, write modular and well-documented TypeScript code, enforce strict testing protocols, and conduct thorough peer code reviews.
Required Skills and Qualifications
- 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.
- Proven experience architecting scalable RESTful APIs, WebSockets, and/or GraphQL services.
- 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.
- Nice-to-have: Experience with Next.js or Remix for production-grade full-stack React frameworks.
- Experience with vector databases or AI model integration into Node.js backend services.
USA Jobs Today role summary
Role Summary
Senior MERN Developer (React.js + Node.js) at Proxify AB is a remote United States position and is listed as Full Time.
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.
Review the employer's original description and official application page before applying; USA Jobs Today organizes source-supported details for readability without changing stated requirements.
Application Checklist
- Review the stated qualifications, including: 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. Proven experience architecting scalable RESTful APIs, WebSockets, and/or GraphQL services.
- Confirm that the official application page still lists the role as open.
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- Tailor your resume to the responsibilities and qualifications stated by Proxify AB.
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Work Location and Schedule
This role is listed as Remote USA with location information shown as Remote USA. The employment type is Full Time.
About the Company
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