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As a Senior Browser Extension Engineer, you'll play a key role in architecting and developing high-performance browser extensions that seamlessly integrate into our ecosystem. Tackling complex engineering challenges, influence key technical decisions, and contribute to both strategic architecture and hands-on implementation.

Responsibilities

● Architect and develop robust, high-performance browser extensions using TypeScript, React, and modern frontend tooling.

● Clarify and solve ambiguous problems by identifying key requirements, breaking them down into manageable, testable components, and delivering well-engineered solutions.

● Assess and integrate third-party tools and libraries, making strategic decisions to balance trade-offs effectively.

● Drive performance optimisations by eliminating bottlenecks, enhancing UI responsiveness, reducing load times, and streamlining event handling.

● Quickly understand and debug unfamiliar code, using reverse engineering when required to analyse other extensions and diagnose issues effectively.

● Provide technical representation in cross-functional discussions, advising on feasibility, architectural considerations, and key trade-offs to guide

smart product decisions.

● Build privacy-first features, prioritising secure handling, storage, and transmission of sensitive data.

● Stay vigilant to security threats, applying fundamental browser security principles to proactively mitigate risks.

● Advocate for secure coding practices, implementing safeguards to protect user data while balancing privacy, security, and user experience.

● Improve test coverage for internal npm packages, writing unit and integration tests that validate public interfaces and remain resilient to

refactors.

● Drive modularity and maintainability by contributing well-documented, testable code across our libraries and browser extensions.

● Shape our automated testing strategy, exploring regression testing for browser extensions to streamline releases and catch issues early.

Experience & Qualifications

● Strong commercial experience with TypeScript and React, including advanced TypeScript features and React performance optimisation.

● In-depth knowledge of front-end tooling (Redux, Webpack, Jest), leveraging these tools to maximise performance and scalability in large-scale, high-performance applications.

● Deep understanding of browser extension architecture and APIs, with hands-on experience implementing and maintaining complex features.

● Strong software engineering fundamentals, with proven expertise in event-driven and object-oriented programming and their associated design patterns to build scalable, performant, and maintainable systems.

● Strong JavaScript expertise, including asynchronous programming, event loop mechanics, closures, and functional patterns