Senior Full-Stack Engineer (React/Node.js)

We are seeking a Senior Full-Stack Engineer with strong expertise in React and Node.js to join our team working on innovative e-Ink based products and companion applications. In this role, you will work across frontend, backend, and integration layers, ensuring seamless interaction between an e-ink device, its cloud services, and companion apps (web and mobile).

You will contribute to both new feature development (e.g., analytics, sharing, personalization) and maintenance/stabilization activities (bug fixing, optimization, knowledge transfer). A solid understanding of secure, scalable, and performant web/mobile applications is essential.

Key Responsibilities:

• Develop and maintain web companion applications (React, TypeScript) supporting document sync, sharing, and account management.


• Implement backend services using Node.js (TypeScript) for APIs, synchronization, and user management.


• Contribute to cloud integrations (AWS-based services, Keycloak identity management, REST APIs).


• Ensure secure data handling (encryption, authentication, GDPR compliance).


• Collaborate with mobile engineers to align React Native components with device and cloud integrations.


• Support knowledge transfer activities: documenting flows, APIs, and technical processes.


• Participate in ADR decisions, code reviews, CI/CD pipelines, and quality-first practices.


• Work closely with QA engineers on automation strategy, integration tests, and end-to-end flows.


• Optimize performance for content sync, large files (PDF/EPUB), and offline/online modes.

Required Skills & Experience:

• 5+ years of professional experience in full-stack development.


• Strong proficiency in React (Hooks, Context, Redux or similar state management) and Node.js (TypeScript, Express/NestJS).


• Experience with RESTful API design and integration.


• Hands-on knowledge of secure coding practices (JWT, OAuth2, TLS, input validation).


• Familiarity with MongoDB, SQL, or other database systems.


• Experience with CI/CD pipelines (GitLab, Docker, Kubernetes).


• Solid understanding of Agile practices and working in distributed teams.


• Upper-Intermediate English level.

Nice to Have:

• React Native experience (building cross-platform mobile apps).


• Familiarity with offline-first architectures and sync mechanisms.


• Knowledge of cloud services (AWS, Keycloak, HawkBit).


• Experience with EPUB/PDF libraries, document rendering, or file-sharing platforms.


• Prior work on IoT, embedded, or device-companion ecosystems.

Personal Attributes:

• Strong ownership mindset, able to work across frontend and backend with equal confidence.


• Comfortable collaborating in multi-vendor and multi-technology environments.


• Product-oriented, with a focus on delivering business value and user experience.


• Curious and adaptable — quick to learn new frameworks and approaches.