Senior Developer

Critical Mass; Calgary; Hybrid; CAD 80,000 - 100,000; Full time

Job summary

A leading digital marketing agency in Calgary is seeking an experienced front-end developer to lead architecture decisions and implement web solutions. You will mentor junior developers, conduct code reviews, and ensure code is scalable and maintainable. The ideal candidate has over 5 years of front-end experience with HTML/CSS and Git, and is passionate about collaborating with cross-functional teams. Competitive benefits and a focus on professional growth included.

Benefits

Global maternity and parental leave

Competitive benefits packages

Flexible vacation days

Early dismissal on Fridays

Access to online services for families

Qualifications

• 5+ years of professional front-end development experience.
• Strong experience with HTML5 and CSS3, including SASS/SCSS.
• Experience mentoring other developers and promoting team culture.

Responsibilities

• Design and implement solutions for JIRA tickets.
• Own front-end architecture and implementation decisions.
• Conduct thorough code reviews and provide feedback.

Skills

HTML5

CSS3

Git

jQuery

REST APIs

Front-end architecture

Code optimization

Tools

Webpack

Gulp

Grunt

Job description

As a key member of our development team, you will independently design and implement solutions for JIRA tickets, rigorously test your work across environments, and actively contribute to stand‑ups and day‑to‑day delivery. You’ll support troubleshooting efforts, review and approve pull requests, and drive code quality through enhancement and refactoring ideas shared with our Tech Leads. You will also lead smaller projects with support from technical leadership and contribute to interviewing, onboarding, and mentoring to help grow the wider team. If you’re ready to lead front‑end development on our existing projects, elevate code quality, and help grow the team’s skills, we’d love to hear from you.

Our new hires & employees are the future of our organization, and we want to set you up for long‑term success. In an effort to do so, we expect our team to work from an office a minimum of 3 days a week.

You Will:

• Own front‑end architecture and implementation decisions, ensuring code is scalable, maintainable, and consistent across projects.
• Collaborate closely with designers, back‑end developers, project managers, and other stakeholders to shape requirements and deliver high‑quality features.
• Conduct thorough code reviews, providing constructive feedback and helping to maintain coding standards and best practices.
• Mentor and support intermediate and junior developers, guiding them on technical approaches, patterns, and problem‑solving.
• Proactively identify and resolve performance issues, improving load times, responsiveness, and overall usability.
• Debug and troubleshoot complex front‑end issues.
• Promote and maintain clean, well‑documented code, and ensure project documentation is complete and up to date in line with platform guidelines.
• Stay current with front‑end technologies and best practices - and help evaluate and introduce new tools/approaches where they add value.

You Have:

• 5+ years of professional front‑end development experience, including work on complex or large‑scale web applications.
• Strong, hands‑on experience with HTML5 and CSS3, including pre‑processors such as SASS/SCSS.
• Proven experience designing or working within scalable front‑end architectures and patterns (modular components, separation of concerns, reuse).
• Solid experience with Git and modern collaborative workflows (pull requests, branching strategies, code reviews).
• Demonstrated ability to take ownership of features from concept through to deployment and support.
• Excellent communication and collaboration skills, with the ability to work effectively across disciplines.
• Experience guiding or mentoring other developers and contributing to a positive, learning‑focused team culture.

You May Have:

• Experience using jQuery for DOM manipulation and event handling, particularly in maintaining or modernizing existing codebases.
• Strong experience integrating with REST APIs, including error handling, state management, and data flow on the front end.
• Familiarity with SEO‑related front‑end practices (semantic HTML, performance, metadata, structured content).
• Hands‑on experience with front‑end build tools such as Webpack, Gulp, Grunt, or similar (configuration, optimization, troubleshooting).
• Knowledge of front‑end performance optimization techniques, such as bundling, code splitting, minification, and asset optimization.

What We Offer:

• Global maternity and parental leave
• Competitive benefits packages
• Vacation, compassionate leave, personal/sick days, and flex days
• Access to online services for families and new parents
• Early Dismissal Friday’s (off at 3:00 PM local time every Friday)
• 13 affinity groups
• Internal learning and development programs
• Enterprise‑wide employee discounts

Critical Mass is an equal opportunity employer.

As set forth in Critical Mass’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.