Senior Platform JS Full-Stack Developer

Senior Platform JS full-stack developer We're looking for a senior full-stack JavaScript developer to join our Platform team. You'll take ownership of infrastructure projects that make the rest of the product possible: from how we bundle and deliver code to how services authenticate users and communicate with each other. This is a fully remote position under a service agreement. We work primarily within the GMT+1 time zone and expect a regular overlap of business hours on weekdays to allow for meetings and live collaboration. Who we are Readymag is a design tool for creating websites, landing pages, portfolios, magazines, editorials, and presentations. We’re a fully distributed team with a strong international user community and client-oriented service. We value a culture of questions and curiosity with a “measure what can be measured” approach. What you’ll do Design and maintain core infrastructure systems: domains, TLS, caching, proxying, load and geo balancing; Own and evolve the authentication system, including 2FA, SSO, and related security flows; Maintain and improve billing integrations; Develop and support the mailer system and internal tooling (including browser extensions); Take ownership of our bundling pipeline, including custom plugins and build tooling; Work on SSR and isomorphic rendering with Solid.js; Support observability infrastructure (using OpenTelemetry stack); Implement and improve image/video processing pipelines and project export features; What you'll bring 5+ years of product development experience; Hands-on experience with Node.js/Bun and TypeScript for building, deploying, and maintaining API services; Experience with authentication protocols and security fundamentals (OAuth, SSO, 2FA, common vulnerabilities); Familiarity with observability tooling and practices (logging, tracing, metrics); Experience with MongoDB or other databases; Comfort working across the stack, from browser APIs to infrastructure configuration; English at a B2+ level. Would be a plus Experience with billing systems such as Stripe; Proficiency in the modern Solid.js ecosystem; Knowledge of bundlers and build tooling at a low level (Bun, esbuild, vite, custom plugins); Experience with network and content delivery technologies (HTTP/S, DNS, TLS, CDN, proxying and caching)—not just conceptually, but in practice; Experience with SSR frameworks or isomorphic rendering patterns; Familiarity with containerization, cloud environments, and CI/CD; Experience with media processing pipelines (image/video transformation); Understanding of browser extension architecture. What you’ll get Remote work with a flexible schedule; 28 weekdays of paid annual leave; Access to a corporate laptop; Compensation for coworking space fees; Language courses; Compensation for sports or other physical activities; A learning budget to invest in courses, books, or conferences. How to apply Please use our application form to submit your CV and other necessary details. The form includes mandatory fields, and providing the requested information will be enough for us to review your application. In the "address" field, just indicating your country will be sufficient. If your experience matches our requirements, we'll reach out to schedule the next steps. Thank you!