Senior Frontend Engineer

This role suits a Senior Frontend Engineer with strong experience in React, TypeScript, and building scalable, production-grade systems in an observability domain. You need solid skills in state management (Redux Toolkit), testing, performance, and working within large monorepos and distributed systems . The candidate should be familiar with owning features end-to-end, contributing to open-source projects, and building reliable, high-scale alerting or monitoring interfaces while mentoring teammates.

1. How would you design a frontend system to manage alerting at scale (e.g., hundreds of evaluations per second)?
   I would focus on efficient state management, incremental updates, and minimizing re-renders. Using caching and selective subscriptions ensures the UI remains responsive under high-frequency updates.

2. What challenges arise when building alerting UIs for distributed systems, and how do you handle them?
   Handling real-time updates, consistency, and large volumes of alerts are key challenges. I address them with efficient data fetching, batching updates, and clear UI feedback for system state.

3. How do you use Redux Toolkit and RTK Query effectively in large-scale React applications?
   I use RTK Query for server state management and caching, while Redux handles global UI state. This separation simplifies data flow and improves maintainability.

4. How would you optimize performance in a React application dealing with logs, metrics, and alerts?
   I use virtualization, memoization, and efficient data structures. Profiling tools help identify bottlenecks and guide optimizations.

5. What are best practices for testing frontend applications at scale?
   I combine unit tests (Jest), integration tests (React Testing Library), and API mocking (MSW). This ensures reliability and prevents regressions.

6. How do you design reusable UI components in a large monorepo environment?
   I follow design system principles, enforce consistent APIs, and ensure components are well-documented. Tools like NX help manage dependencies and scalability.

7. How do you handle real-time data updates in a frontend application?
   I use polling or WebSockets depending on requirements and ensure efficient state updates to avoid unnecessary re-renders.

8. What is your approach to maintaining code quality in a large team?
   I enforce linting, formatting, code reviews, and testing standards. Automation ensures consistency across the codebase.

9. How do you collaborate effectively in a remote, open-source-driven environment?
   I prioritize clear communication, documentation, and async collaboration. Open discussions and transparency help align distributed teams.

10. How do you take ownership of features from ideation to production and beyond?
    I participate in design, implementation, deployment, and monitoring. Continuous iteration based on user feedback ensures long-term success.

Grafana Labs is a leading open-source observability company with 20M+ users worldwide, powering dashboards and monitoring systems for organizations like Bloomberg and JPMorgan. They are hiring a Senior Frontend Engineer to build and scale alerting systems using React, TypeScript, Redux Toolkit, and modern frontend tooling, focusing on performance, reliability, and distributed systems at scale . This is a fully remote UK-based role offering £91K–£110K plus RSUs and strong benefits. It’s a compelling opportunity to work on mission-critical infrastructure in a globally distributed, open-source-driven engineering culture with real-world impact.