Senior Full Stack Developer Jobs in Markham, ON (NOW HIRING)

We aspire to become a market leader in designing and building bespoke software in Canada, and to be a destination of choice for the world's smartest people and world's best customers!Kablamo is an Advanced Tier AWS Consulting partner, and we've been recognized as a global leader in designing and building cloud-based data and AI/ML solutions. We've also been recognised with multiple industry and design awards for our work in developing one of the world's leading wildfire intelligence platforms, Firestory. We aim to continue our track record of success by expanding our customer-base, local team, brand, social impact and community involvement in Canada over the coming years.The RoleOur Senior Developers work at the bleeding edge of what is possible.

They are passionate about delivering high-quality results through repeatable processes and development patterns, and they set the standard for the engineers around them. They work seamlessly across the Full Stack, building rich and dynamic Front End code, robust and performant Back End APIs and services, and, increasingly, integrating AI capabilities that change what our clients believe is possible.Our Senior Developers are curious by nature and love exploring the latest technologies. They take ownership of complex features end-to-end, mentor the engineers around them, and have no greater satisfaction than seeing our clients' disbelief at the speed and quality with which their application has "popped" to life.

Responsibilities Lead the design and development of full stack web applications across front end and back end, delivering clean, maintainable, and well-tested code Build dynamic user interfaces using React.js and TypeScript in line with design specifications and UX requirements Design, develop, and maintain RESTful or GraphQL APIs, ensuring reliability, performance, and security Actively use AI-assisted development tools or Agentic SDLC (e.g. Claude Code, Cursor, GitHub Copilot) across your day-to-day work to accelerate delivery while maintaining code quality Build and integrate AI-powered features into client applications, including LLM integration patterns, prompt engineering for end-user features, and patterns such as RAG, structured outputs, and tool/function calling Contribute to team standards for responsible and effective use of AI tools - including prompt practices, code quality guardrails, and review processes for AI-generated output - and help mid and junior engineers get the most out of them Help shape Kablamo's point of view on where AI is and isn't a fit for client problems, and contribute reusable patterns and building blocks for AI-augmented products Drive technical discussions and propose solutions to complex engineering challenges, escalating trade-offs to the Tech Lead as appropriate Write and maintain unit, integration, and end-to-end tests to uphold code quality standards Lead code reviews, giving and receiving constructive feedback to maintain team standards Diagnose and triage defects and production issues, identifying root causes and delivering fixes Work collaboratively within cross-functional teams including product, design, and infrastructure to deliver end-to-end solutions Take ownership of significant features or modules from requirements through to deployment Mentor mid and junior developers through pairing, code review, and day-to-day guidance, and support their technical growth Participate actively in agile ceremonies including stand-ups, sprint planning, backlog grooming/refinement, showcases, and retrospectives Contribute to technical documentation and internal knowledge sharing initiatives Continuously develop your technical skills and stay current with relevant emerging technologies and frameworks Identify and manage security risks within the scope of the role, ensuring compliance with defined security controls, escalating emerging threats to the Risk Manager and Senior Leadership Team, and supporting the continuous improvement of security practices Required skills and experience 5+ years developing complex web applications in a commercial setting Strong experience with modern JavaScript / TypeScript, Node.js, and React.js (or equivalent) Strong knowledge of at least one high-level programming language beyond JavaScript (Python, Go, Java, C#) Solid experience developing and consuming REST and/or GraphQL APIs, including JSON/XML data manipulation and CORS Experience with relational and/or NoSQL databases (e.g. PostgreSQL, MySQL, DynamoDB, MongoDB) Working experience with AWS cloud services (or equivalent) Strong knowledge of OOP, design patterns, and dependency injection Experience with Git/GitHub including merging, rebasing, and pull-request branch strategy Experience with SASS, LESS, or modern CSS tooling (Tailwind, CSS-in-JS, etc.) Hands-on experience using AI-assisted development tools (e.g.

Claude Code, Cursor, GitHub Copilot) to accelerate delivery while maintaining code quality Hands-on experience integrating LLM APIs into production applications, including familiarity with prompt engineering, structured outputs, and tool use / function calling Track record of mentoring more junior engineers and lifting team-wide quality Strong interpersonal skills and the ability to collaborate effectively within a cross-functional team Desirable skills and experience Experience with Docker and containerised workflows Experience with CI/CD pipelines and infrastructure-as-code Experience building AI-powered features into production applications, including LLM integration patterns and prompt engineering for end-user features Familiarity with agentic systems or AI-augmented product workflows Experience with AWS Bedrock, SageMaker, or comparable managed AI/ML services Familiarity with vector databases and embeddings (pgvector, OpenSearch, Pinecone, etc.) AWS Associate or Professional level certifications Career Progression Tech Lead Engineering Manager Our CultureAt Kablamo, we strive to "Make with Heart and Mind". We're passionate and brave craftspeople, we love to redefine what's possible, and we seek growth and discovery together. We acknowledge a workplace that is diverse and inclusive, enables for greater innovation and produces benefits including improved performance, improved employee happiness and wellbeing, and superior outcomes for our customers.The PERKS!

Flexible work environment with an office located in Toronto Career growth (we really do promote from within!) Individual training budget Regular social events Blogging rewards Paid birthday leave Anniversary bonus Referral bonus Parental Leave top up Employee Assistance Program Work abroad for up to 3 weeks per year (some restrictions apply)