Senior Web Developer (Full Stack)

Klick; Toronto; On-site; CAD 100,000 - 130,000; Full time

Job summary

The Klick Group in Toronto is seeking a Senior Web Developer to join the Full Stack + AI team. You will lead production web experiences and AI-assisted workflows for life sciences brands, guiding quality, accessibility, security, and performance.

You will mentor engineers, collaborate with cross-functional teams, and shape architecture while delivering robust, scalable web applications using modern HTML/CSS/JS/TypeScript and server-side tech.

Qualifications

• 5+ years of professional web development delivering production applications across front-end and server-side code.
• Hands-on experience using AI coding agents such as Claude Code, Cursor, Codex, or equivalent.
• Experience building production features that integrate with an LLM API and ensuring security/testing.
• Experience delivering accessible, secure, and performant web apps with WCAG 2.2 AA, OWASP controls, and CI/CD.
• Experience leading technical delivery, estimation, architecture decisions, and mentoring.

Responsibilities

• Lead development of production web applications and server-side services from architecture to deployment.
• Design and operate agentic development workflows with AI tools.
• Own code quality with automated tests, type checks, linting, and CI/CD gates.
• Build integrations with CMS, analytics, and data layers while protecting personal information.
• Communicate architecture decisions and delivery risks to technical and non-technical stakeholders.

Skills

Web development

AI coding agents

LLM integration

Accessibility & security

Mentoring & code review

Tools

Claude Code

Cursor

Codex

Next.js

Gatsby

Astro

Contentful

AEM

Job description

The Klick Group

—comprising Klick Health (including Oxford PharmaGenesis, Klick Katalyst, and btwelve), Klick Media, Klick Applied Sciences (including Klick Labs), and Klick Consulting—is an ecosystem dedicated help life sciences brands achieve their full potential through best-in-class marketing and advertising, media, medical affairs and communications, market access, real-world evidence, and technology and analytics consulting — powered by 500+ in-house medical experts and award-winning data science and AI capabilities. Founded in 1997, we have offices in Toronto, New York, Oxford, London, Cambridge, Cardiff, Melbourne, Philadelphia, Saratoga Springs, São Paulo, and Singapore. One of the most-awarded health agencies on the planet, Klick is consistently recognized for its people-first culture as a Great Place to Work, Best Workplace for Women, Best Workplace for Inclusion, Most Admired Corporate Culture, and FORTUNE Best Workplace in Advertising. Klick also recently made history as Cannes Lions Healthcare Agency of the Year, Healthcare Network of the Year, and Independent Agency of the Year – Health.

About Our Technology Craft

Our Technology Craft powers Klick’s innovation through platforms, products, and emerging technologies. This craft enables scale, efficiency, and experimentation across the business. Technology teams transform ideas into functional, future-ready solutions. Their work supports both client delivery and internal growth.

Job Description

The Senior Web Developer builds and delivers production web experiences and supporting services for life sciences brands as part of Klick’s Full Stack + AI team. The role combines deep web engineering expertise with AI-native development practices, using coding agents, structured context, automated verification, and human review to improve delivery quality and efficiency. This individual leads technical delivery on projects, partners with Technical Directors and cross-functional teams, and mentors developers on engineering standards, accessibility, security, performance, and effective AI-assisted development.

What You’ll Do

• Lead development of production web applications and supporting server-side services using modern HTML, CSS, JavaScript/TypeScript, APIs, and server-side technologies, from initial architecture through deployment and maintenance.
• Design and operate agentic development workflows using tools such as Claude Code, Cursor, Codex, or equivalent, including task decomposition, project instructions, reusable prompts or skills, tool integrations, automated verification, and defined human review checkpoints.
• Own code quality across human- and AI-generated work by applying automated tests, type checks, linting, CI/CD gates, code review, OWASP-aligned security practices, WCAG 2.2 AA accessibility standards, and Core Web Vitals performance requirements.
• Build reliable integrations with headless or enterprise CMS platforms, APIs, analytics implementations, Google Tag Manager, and structured data layers while maintaining testability, maintainability, and appropriate handling of personal or confidential information.
• Lead technical estimation, documentation, risk identification, code review, and developer mentoring, communicating architecture decisions, scope assumptions, delivery risks, and AI development practices clearly to technical and non-technical stakeholders.

Qualifications

Required:

• 5+ years of professional web development experience delivering production applications across front-end and server-side code, with demonstrated expertise in semantic HTML, modern CSS, JavaScript/TypeScript, APIs, and a server-side language such as Node.js.
• Hands-on experience using AI coding agents such as Claude Code, Cursor, Codex, or equivalent as part of regular software delivery, including task planning, context or instruction management, automated verification, diff review, and documented human approval before production deployment.
• Experience building at least one production feature, internal tool, or workflow that integrates directly with an LLM API, with observable responsibility for implementation, testing, evaluation, security, or ongoing maintenance.
• Experience delivering accessible, secure, and performant web applications using WCAG 2.2 AA practices, OWASP-aligned controls, Core Web Vitals optimization, automated testing, Git workflows, CI/CD pipelines, and documented deployment or rollback processes.
• Experience leading technical delivery through estimation, architecture or implementation decisions, code review, risk management, and mentoring, with examples of communicating technical trade-offs to both engineering teams and non-technical stakeholders.

Desired:

• Comfort and enthusiasm for using AI as a regular part of how work gets done.
• Experience with frameworks such as Next.js, Gatsby, or Astro and headless or enterprise CMS platforms such as Contentful, AEM, or Drupal, demonstrated through production web delivery.
• Experience implementing analytics using Google Tag Manager, GA4, and structured data layers, including event tracking, testing, or measurement requirements.
• Experience deploying web applications using AWS, Azure, or GCP, serverless services, Docker, or comparable cloud and container technologies.
• Experience building internal AI tools or agents using an agent SDK, including evaluation approaches such as baseline comparisons, automated scoring, or LLM-as-judge methods, or delivering technology within pharmaceutical, healthcare, or another regulated environment.

Additional Information

This posting is for a net new vacancy at Klick.

The base salary range for this position is between CAD $100,000 - $130,000. The final amount offered will be determined based on several factors such as a candidate's work location, their unique skill set, education, and prior work experience.

Our Commitment to Inclusion

Klick is consciously creating a culture where everyone can thrive and grow in their careers. We believe that our best work comes from our diverse backgrounds, perspectives, and skills. We strongly encourage members of historically underrepresented communities to apply, including Black people, Indigenous peoples, and other people of color, people with disabilities, people from gender and sexually diverse communities and people with intersectional identities. We're also committed to developing an inclusive, barrier-free recruitment process and work environment. Should you require any accommodation, please contact us at [e-mail] and we will work with you to meet your accessibility needs and ensure you have a positive experience.

Klick uses an AI-powered tool as part of an automated process to support our hiring process by analyzing your experience, skills, and qualifications to help identify alignment with role requirements. Please note that the tool does not make final decisions or automatically disqualify candidates. Hiring decisions are made by our team, with thoughtful human judgment and oversight. We are committed to fair and transparent hiring practices and have implemented safeguards to help mitigate bias and support compliance with applicable laws. If you have questions, accessibility needs, or concerns about the use of this tool, please contact us.