Senior Frontend Engineer

ANVIL

8d•Hybrid

About The Position

As a Senior Frontend Engineer, you will play a pivotal role in designing, developing, and maintaining sophisticated user interfaces that power our analytical tools and data visualization platforms. You will architect scalable frontend applications, optimize performance for large datasets, and ensure our user interfaces deliver exceptional experiences for mission-critical workflows. Furthermore, you will use your knowledge of industry best practices to provide strategic guidance to engineering leadership on how to most effectively design frontend architectures that scale with our growing customer base and evolving product requirements. We value people who have an ingrained sense of accountability to the team around them. As an ideal candidate you are not only technically qualified, but you demonstrate a strong work ethic and take pride in your craft. You also collaborate and communicate effectively with the other talented and motivated members of our organization.

Requirements

7+ years of professional experience building production React applications, including technical leadership on at least one of them
Experience architecting and scaling frontend applications, including the foundational decisions about module boundaries, state management, rendering strategy, and data flow
Experience establishing frontend engineering standards on a team, such as coding patterns, component library design, review practices, or testing strategies
Experience mentoring other engineers through pairing, design review, and code review
Experience with modern CSS (CSS Modules, Tailwind, or equivalent), including responsive and accessible design
Experience integrating with REST APIs, including complex asynchronous flows and error handling
Strong working experience with unit and integration testing
Strong working experience with Playwright for testing full user workflows, including strategies to keep test suites reliable at scale
Expert proficiency in React, including hooks, concurrent features, rendering behaviour, and framework internals, with the depth to reason about performance and correctness
Expert proficiency in modern JavaScript and TypeScript, including ES6+ language features
Strong understanding of frontend architecture, modular design, and building applications from composable components at scale
Expert knowledge of HTML5, CSS3, and modern styling methodologies (Flexbox, Grid, responsive and adaptive design)
Strong understanding of web performance optimization, rendering pipelines, and profiling tools (Lighthouse, React Profiler, Chrome DevTools)
Working knowledge of accessibility standards (WCAG 2.1) and a track record of shipping accessible interfaces
Experience configuring and optimizing modern build tools (e.g., Vite, Webpack) and maintaining scalable project structures
Experience with state management libraries (Redux, Zustand, or similar) and the judgment to know when not to use one
Solid grasp of frontend security practices (XSS, CSRF, CORS, and content security policies)
Proficiency with Git workflows, CI/CD integration, and collaborative development practices
Strong written and spoken communication, with the ability to explain technical decisions and tradeoffs to engineering, product, and executive audiences
Demonstrated technical leadership through setting direction, mentoring peers, and building consensus by expertise rather than authority

Nice To Haves

Experience building applications that handle large datasets, streaming data, or live analytics
Experience building live communication features using WebSockets or other streaming protocols
Experience with WebGL, Canvas, or advanced graphics rendering techniques for interactive visualization
Experience with knowledge management systems, case management systems, or relevant defence industry applications
Experience with CI/CD pipelines and frontend observability tools (GitLab, Sentry, Datadog, OpenTelemetry)
Familiarity with containerized development environments (Docker) and modern deployment workflows
Familiarity with Agile or Scrum methodologies and working in sprints
Experience working in or closely with defence, public safety, or national security organizations

Responsibilities

Architect the frontend for complex, demanding workflows, including those that handle large datasets or live data updates
Set the technical direction for the frontend platform, including framework and library choices, module boundaries, state management patterns, and rendering strategy
Evaluate new frontend technologies and advise engineering leadership on adoption tradeoffs across cost, risk, and maintainability over time
Own performance budgets and rendering strategies, including the UI patterns needed for large datasets and live updates
Partner with backend architects to shape API contracts that serve frontend needs and user workflows
Establish and uphold frontend coding standards, patterns, and review practices across the engineering team
Define the testing strategy across unit, integration, and full workflow layers using React Testing Library and Playwright, and keep coverage of critical user flows strong
Treat accessibility (WCAG 2.1), performance, and security as product requirements rather than finishing touches
Lead by example in code review, improving quality and consistency
Mentor intermediate and junior engineers through pairing, design reviews, and feedback on their growth
Lead technical design discussions and architectural reviews for significant frontend work
Help other engineers grow into the standards you establish
Represent frontend in product, design, and engineering leadership forums, including in roadmap planning conversations
Translate technical tradeoffs into language that product owners and engineering leadership can act on
Speak up for user experience, performance, and accessibility when scope, timeline, or architectural pressure push against them
Contribute to sprint planning, reviews, and retrospectives with realistic scoping and honest assessments of risk and dependencies
Communicate development progress, blockers, and strategic frontend direction clearly and proactively