Senior Front‑End Software Engineer - Commerce Platform (HTML, CSS, JavaScript)

Job#: 3028057

Job Description:

Senior Front‑End Software Engineer - Commerce Platform

(HTML, CSS, JavaScript)

Location: Toronto, ON (Remote available — must be based in Canada)

Contract Length: 12 months

Pay: $ - $ CAD

Team: Commerce Experience (Payments, Loyalty, Coupons)

Application Process: It is best to apply via the medium on which you are seeing this posting. If you encounter technical difficulties submitting your resume, please send a Word version of your resume to Mauncho Ogega at

About the Job

As a Senior Front‑End Software Engineer, you will focus on building exceptional web experiences within our clients Commerce Platform. You’ll work closely with product designers and cross‑functional engineers to create interfaces that are accessible, performant, and deliver a frictionless checkout and payment experience.

You will set the bar for front-end engineering excellence—driving high-quality UI design, reusable component architecture, client-side performance, accessibility standards, and intuitive user interaction patterns. While the role involves collaborating with full-stack and backend teams, your primary responsibility will be creating delightful, reliable, and scalable front-end solutions.

You’ll influence the full product lifecycle—from problem exploration to delivering polished, production-ready front-end features. You’ll also champion best practices, maintain consistency across our UI ecosystem, and contribute to broader engineering initiatives that elevate our platform.

About You – Minimum Qualifications

We’re looking for an engineer with deep experience in building high-quality, user-facing web applications. You should have:

• 6+ years of professional front-end or full-stack development experience, with a strong emphasis on UI engineering.
• Expertise in modern web technologies such as HTML, CSS, JavaScript, and frameworks like (or comparable modern front-end frameworks).
• Strong understanding of UX principles, usability patterns, user flows, and interaction design.
• Hands-on experience with front-end testing tools such as Jest, Mocha, or Enzyme.
• Familiarity with server-driven front-end development and experience integrating with back-end frameworks such as Ruby on Rails.
• Experience with GraphQL APIs and building robust client-side integrations.
• Understanding of relational data concepts (, Postgres, Snowflake) as they relate to UI development and data flows.
• Knowledge of client-side caching, state management patterns, and asynchronous data handling.
• Experience building or integrating monitoring tools for front-end performance and error tracking (, Sentry, DataDog, CloudWatch, OpsGenie).
• A proactive, adaptable mindset with the ability to propose and implement enhancements to improve the user experience.

Preferred Qualifications

• Experience building front-end features for payment flows, checkout systems, or other high-complexity eCommerce UI surfaces.
• Familiarity with payment systems, digital wallets, and payment service provider workflows as they relate to user experience.
• Understanding of eCommerce order management and the front-end components that support order lifecycle visibility.
• Experience designing or implementing invoicing, billing, or financial UI flows.
• Comfort working with experimentation frameworks and data-driven user experience optimizations (A/B tests, feature flags, etc.).
• Experience ensuring cross-browser compatibility, accessibility (WCAG), and building reusable UI components or front-end libraries.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.

Apex Benefits Overview: In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA.