Senior Front End Developer (React)
AgencyAnalytics
- Location
- Canada
- Job Type
- full-time
- Salary
- $120,000 - $180,000
- Posted
- July 25, 2025
Job Description
have the opportunity to work on a wide range of projects including greenfield products,
experimental UX/UI improvements, paying down technical debt, improving existing features and
everything in between.
This role is an opportunity for you to really make a high impact and build as we enter our next
phase of growth. We’re looking for someone that not only will be driving new feature development,
but also ensuring best practices are top of mind.
We’re looking for someone who embodies high ownership and accountability. A leader in driving
new feature development, but also ensuring best practices (technical and process) are top of
mind.
Key Responsibilities
beginning to end
● You've designed and developed services that handle millions of requests
● You’re able to innovate through iteration. Breaking down product features into shippable
value increments
● You've worked closely with engineering peers, product and design members to create high
quality products that customers love to use
● You’ve successfully helped your teams prioritize work to maximize quality, stability and
project delivery
● Through code reviews and peer feedback, you advocate for high standards and look for ways
to improve the overall quality of our codebase
● You take a collaborative approach to architecture, technical patterns, and complex problems
● You have experience working in a fully remote environment
Skills, Knowledge & Expertise
advanced CSS
● You have 4+ years experience working on large scale SaaS applications
● You have experience working closely with Backend engineers and UX/UI Designers to plan,
design, and implement system architectures and features
● You have deep experience with frontend performance best practices, tooling, and, monitoring
● You have a high bar for quality and hold yourself and your peers accountable to it
● You proactively take on challenges from start to finish
● You’re good at unblocking yourself and your team to keep things moving
Our Stack
● Typescript, React, and Redux
● GCP Cloud SQL (MySQL), BigQuery, and Redis
● GCP Cloud Tasks and PubSub
● Modern PHP (PSR) + Laravel
About AgencyAnalytics
We're a founder-led Canadian success story that started in 2010, and we're over 140 strong today.
All your information will be kept confidential.
🎯 Who is this job for?
This role is ideal for a Senior Frontend Developer with 5+ years of experience in React, TypeScript, JavaScript, and advanced CSS, particularly within large-scale SaaS environments. Best suited for someone who thrives in remote, cross-functional teams and is strong in performance optimization, frontend architecture, and delivering high-quality user experiences. It's a great fit for developers who enjoy taking full ownership of features and contributing to continuous improvement.
💬 Potential Interview Questions
-
How do you break down a large product feature into shippable increments using React?
Start with MVP planning, build reusable components, implement feature toggles, prioritize user value delivery, and release iteratively with feedback loops. -
What are best practices you follow for frontend performance optimization in React?
Use code splitting, lazy loading, memoization (React.memo,useMemo), avoid prop drilling, debounce inputs, and monitor with tools like Lighthouse and Web Vitals. -
How do you approach collaboration with backend engineers and designers on complex features?
Align early on data contracts and UI requirements, share API specs or mocks, hold review sessions, and iterate on feedback throughout implementation. -
Describe a time you helped improve code quality through peer reviews.
[Example] Introduced a component structure guide, identified duplicated logic during reviews, refactored shared utilities, and mentored junior developers on testing patterns. -
How do you manage and maintain a scalable Redux store in a growing SaaS app?
Use feature-based slices, normalize state, apply middleware (like Redux Thunk or Saga), follow naming conventions, and abstract shared selectors/actions. -
What monitoring tools or techniques do you use to maintain frontend reliability at scale?
Use Sentry for error tracking, Google Analytics or custom logging for UX issues, performance tracing with Lighthouse or Datadog, and browser-based dev tools. -
How do you ensure consistent styling and responsive design across a large application?
Use a design system or component library, apply CSS modules or styled-components, and test responsiveness with media queries and device simulation. -
Describe your process for implementing a major refactor in a React codebase.
Assess impact, write migration plan, test with unit and snapshot tests, introduce changes incrementally, and document updates for the team. -
How do you handle deeply nested component hierarchies or prop drilling issues in React?
Use context providers, composition patterns, or state management like Redux to lift state and improve maintainability. -
What makes a successful remote team from a senior engineer’s perspective?
Clear async communication, detailed PR reviews, shared documentation, proactive updates, mentoring via calls or pair programming, and a strong feedback culture.
📋 Job Summary
AgencyAnalytics is hiring a Senior Frontend Developer to drive the development of high-impact features and UX improvements on their SaaS platform for marketing agencies. This fully remote role involves building scalable apps using React, TypeScript, and Redux, collaborating closely with backend and design teams. Ideal candidates have 5+ years of experience in React and large-scale SaaS, a strong focus on frontend performance, and a passion for quality. Join a Canadian-led company making data reporting seamless for agencies, with plenty of ownership and growth opportunity.