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Senior Browser Extension Developer

2 weeks ago

Fareham, Hampshire, United Kingdom Total Security Limited Full time

This job is brought to you by Jobs/Redefined, the UK's leading over-50s age inclusive jobs board.

Senior Browser Extension Engineer

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. You'll tackle complex engineering challenges, influence key technical decisions, and contribute to both strategic architecture and hands-on implementation. Your work will help millions of users take control of their online privacy and security.

ResponsibilitiesExtension Development
  1. Architect and develop robust, high-performance browser extensions using TypeScript, React, and modern frontend tooling.
  2. Own the design and implementation of scalable, well-structured solutions to complex technical challenges.
  3. Clarify and solve ambiguous problems by identifying key requirements, breaking them down into manageable, testable components, and delivering well-engineered solutions.
  4. Assess and integrate third-party tools and libraries, making strategic decisions to balance trade-offs effectively.
  5. Drive performance optimisations by eliminating bottlenecks, enhancing UI responsiveness, reducing load times, and streamlining event handling.
  6. Quickly understand and debug unfamiliar code, using reverse engineering when required to analyse other extensions and diagnose issues effectively.
  7. Engineer fault-tolerant integrations that adapt to diverse website implementations, avoiding brittle solutions and ensuring graceful fallbacks.
  8. Stay ahead of the evolving web and browser extension ecosystem, spotting opportunities to drive impactful improvements in our products and workflow.
  9. Uphold and improve engineering standards, ensuring best practices are maintained and continuously refined.
  10. Conduct thorough code reviews, enforcing high standards while mentoring junior engineers to level up their skills.
Collaboration & Integration
  1. Provide technical representation in cross-functional discussions, advising on feasibility, architectural considerations, and key trade-offs to guide smart product decisions.
  2. Collaborate with the Browser Extension Team Lead to design elegant solutions that align with the long-term vision and integrate smoothly within our ecosystem.
  3. Coordinate with engineers, designers, and product teams to align browser extension functionality with our app and web platforms, ensuring a seamless user experience.
  4. Partner with support and QA teams to diagnose and resolve technical issues, ensuring critical fixes are quickly deployed to production.
  5. Review code for maintainability and best practices, mentoring engineers to improve code quality, system design, and problem-solving.
Security & Privacy
  1. Build privacy-first features, prioritising secure handling, storage, and transmission of sensitive data.
  2. Stay vigilant to security threats, applying fundamental browser security principles to proactively mitigate risks.
  3. Advocate for secure coding practices, implementing safeguards to protect user data while balancing privacy, security, and user experience.
Testing & Quality Assurance
  1. Improve test coverage for internal npm packages, writing unit and integration tests that validate public interfaces and remain resilient to refactors.
  2. Drive modularity and maintainability by contributing well-documented, testable code across our libraries and browser extensions.
  3. Shape our automated testing strategy, exploring regression testing for browser extensions to streamline releases and catch issues early.
  4. Monitor extension performance, identifying regressions and ensuring a reliable user experience.
Experience & Qualifications
  1. 5+ years of commercial experience with TypeScript and React, including advanced TypeScript features and React performance optimisation.
  2. In-depth knowledge of front-end tooling (Redux, Webpack, Jest), leveraging these tools to maximise performance and scalability in large-scale, high-performance applications.
  3. Deep understanding of browser extension architecture and APIs, with hands-on experience implementing and maintaining complex features.
  4. 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.
  5. Ability to make well-reasoned technical decisions, considering all factors, including complexity, long-term maintainability, and how quickly the team can get up to speed.
  6. Strong JavaScript expertise, including asynchronous programming, event loop mechanics, closures, and functional patterns.
  7. Strong debugging skills, able to analyse unfamiliar code, resolve complex bugs, and optimise event-driven systems.
  8. Experience mentoring and guiding junior engineers through thoughtful code reviews and promoting high technical standards.
  9. Passionate about software craftsmanship, owning solutions, improving code quality, and driving best practices.
  10. Effective communicator, bridging technical and non-technical teams to advocate for balanced solutions and explain complex concepts clearly.
What we offer in return:

Our staff work hard for us, so in return for this, alongside various company events, a fantastic office space and a great team culture, we offer -

  1. Salary: £50,000 - £60,000
  2. Up to 10% annual personal performance based bonus
  3. 28 days annual leave, plus length of service accrual
  4. Breakfast, lunch, drinks & snacks provided
  5. Company pension
  6. BUPA Health & Dental care
  7. Death in Service benefit
  8. BUPA Peak Assessments
  9. Netflix & Spotify subscriptions
  10. Gym & Golf Membership
  11. Beer fridges & onsite cocktail bar
  12. Onsite hairdressers
  13. + Many more
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