Senior MERN Developer (React.js + Node.js)
Proxify AB
Senior MERN Developer (React.js + Node.js) at Proxify AB is a full time role based in Remote · Worldwide (remote). Listed skills: JavaScript, Node.js, React and Full Stack Dev. It was published on 14 August 2026 and was open at last check.
| Role | Senior MERN Developer (React.js + Node.js) |
|---|---|
| Company | Proxify AB |
| Location | Remote · Worldwide (remote) |
| Employment type | Full Time |
| Skills listed | JavaScript, Node.js, React and Full Stack Dev |
| Published | 14 August 2026 |
| Status | Open at last check |
Headquarters: Sweden
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
Create your free OnJob profile to apply — we'll take you to Proxify AB's application after sign-up. · Posted 14 Aug 2026.
Senior MERN Developer (React.js + Node.js) at Proxify AB — questions answered
What does the Senior MERN Developer (React.js + Node.js) role at Proxify AB pay?
Proxify AB does not publish a salary on this Senior MERN Developer (React.js + Node.js) listing, so OnJob shows no figure for it rather than an estimate. For what this role pays across the market, the OnJob salary guides aggregate the live listings that do disclose pay.
Is the Senior MERN Developer (React.js + Node.js) role at Proxify AB remote?
Yes — Proxify AB advertises this Senior MERN Developer (React.js + Node.js) role as remote, tied to Remote · Worldwide, and it is listed as full time work. Remote terms come from the employer's own posting, so confirm the expected working hours, timezone and any on-site days with Proxify AB before you apply.
What skills does the Senior MERN Developer (React.js + Node.js) role at Proxify AB require?
The Senior MERN Developer (React.js + Node.js) at Proxify AB listing names JavaScript, Node.js, React and Full Stack Dev. Those are the skills the employer put on the posting itself, so they are the ones worth matching in your profile and covering first in an interview.
Is the Senior MERN Developer (React.js + Node.js) role at Proxify AB still open?
The Senior MERN Developer (React.js + Node.js) posting at Proxify AB was open at OnJob's last check of the employer's careers page, having been published on 14 August 2026. OnJob re-checks source listings on each build and marks a role closed once it disappears, but listings can close without notice, so the employer's own page is the final word.
How do you apply for the Senior MERN Developer (React.js + Node.js) role at Proxify AB?
Apply to the Senior MERN Developer (React.js + Node.js) at Proxify AB role through OnJob with a free profile: OnJob scores your fit against the listing, shows the skills lowering that score, and submits an ATS-ready profile to Proxify AB's own application page. Creating a profile is free and needs no card.
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