We are looking for aSenior Web Engineerto work on ahigh-performance, security-critical Web SDK.
This is alow-level frontend role, focused on performance, browser APIs, and secure integrations.
Key Responsibilities
Develop and maintain aTypeScript-based Web SDK
Buildframework-agnostic componentsusingWeb Components
Integrate with backend viaWebSockets / real-time communication
Ensureperformance, security, and resistance to reverse engineering
Contribute totesting (integration / E2E)
Core Requirements
StrongTypeScript / JavaScript
Experience withWeb Components(Custom Elements, Shadow DOM)
Solid understanding ofbrowser performance & rendering
Experience withWebSocketsand 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)
Dockerand basicKubernetes
Profile
Strong engineering fundamentals (beyond frameworks)
Comfortable withlow-level web concepts
Able to balanceperformance, security, and usability
This is a fully remote role, but candidates must be currently based in Portugal.