Senior 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.

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;

• Collaborate with the Core and Growth teams on shared projects like templates and examples.

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);

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.