We are looking for a Senior Web Engineer to work on a high-performance, security-critical Web SDK .
This is a low-level frontend role, focused on performance, browser APIs, and secure integrations.
Key Responsibilities
* Develop and maintain a TypeScript-based Web SDK
* Build framework-agnostic components using Web Components
* Integrate with backend via WebSockets / real-time communication
* Ensure performance, security, and resistance to reverse engineering
* Contribute to testing (integration / E2E)
Core Requirements
* Strong TypeScript / JavaScript
* Experience with Web Components (Custom Elements, Shadow DOM)
* Solid understanding of browser performance & rendering
* Experience with WebSockets and real-time systems
Important Knowledge Areas
* Security fundamentals (OAuth2, JWT, encryption basics, hashing)
* Performance topics (Canvas / WebGL, WebAssembly is a plus)
* Testing tools (Playwright, Jest or similar)
* Docker and basic Kubernetes
Profile
* Strong engineering fundamentals (beyond frameworks)
* Comfortable with low-level web concepts
* Able to balance performance, security, and usability
This is a fully remote role, but candidates must be currently based in Portugal.