Senior Full Stack Developer, Contract

About the role

BIMM is a Toronto-based agency that lives at the intersection of data, technology, and creativity to provide clients with high-performing campaigns and digital products that shape connected customer experiences. We've helped our clients implement fully integrated CRM customer journeys, built robust digital experiences, and created national loyalty programs with decades of experience in sectors of automotive, financial, telco and retail. We are creative realists, which means our ideas and solutions are grounded in the realities of our clients' business. We believe big ideas are nothing without big results (and flawless execution); high-performing agencies deliver high-performing campaigns, products, and experiences; and the best solutions happen when we collaborate with clients as partners. Our Technology department is a 50+ person distributed team of Developers, QA, and Architects delivering amazing digital products on a leading-edge technology stack. This is an existing vacancy, not a made-up role - this one's already got a desk waiting. Who we're looking for You use modern tools and frameworks (REACT and Node.js) and can code up an application from scratch and spin up a cloud infrastructure to host it. You leverage modern tools and frameworks (REACT and Node.js) to architect and develop applications from the ground up, with a particular focus on enabling agentic workflows. You design systems that empower autonomous agents to interact, make decisions, and execute tasks seamlessly building both the application logic and the underlying cloud infrastructure needed to support scalable, dynamic agent operations. You have a clear understanding of security and build it into any of your services. Although you have full support of your teammates, you can participate in the research and solution to complex problems. At the same time, you know when to ask for help and don't let pride or ego get in the way, because after all, you are part of a team. "Initiative" is your middle name, and you don't give us a chance to chase you. We are on the hunt for people who have an innovative mindset (you still dream of that moonshot project but are currently working on your side -gig)! Is this you? Technology Requirements To ensure a secure and compatible working environment, the following technology requirements must be met: Use a Mac or Windows device (Linux or other OS not supported) Windows 11 or macOS Sonoma/Sequoia or newer is required Windows 10 may be used up to October 2025 macOS Big Sur, Monterey, and Ventura are not permitted Device must be less than 4 years old Agree to have us install and maintain BIMM's security tools on your device. These tools must remain active, with all permissions and configurations unchanged for the duration of the contract

Responsibilities

• Core Engineering
• Optimizing website performance: Making sure websites load quickly and efficiently.
• Developing APIs (Application Programming Interfaces): Creating interfaces that allows different applications to communicate with each other.
• Understanding the entire web development process: Having a holistic view of how the front end and back end work together.
• Working with different technologies: Being proficient in a variety of programming languages, frameworks, and tools.
• AI Engineering
• Build and maintain automated evaluation pipelines (evals) for agent and skill outputs - including LLM-as-judge scoring, regression test suites, and golden dataset validation - so that prompt and model changes are measurable before they ship.
• Define strict input/output contracts for MCP tools and agent skills using typed schemas (TypeScript interfaces, JSON Schema); ensure tools handle edge cases, surface structured errors, and never return ambiguous output that an LLM must interpret.
• Own the prompt engineering lifecycle for assigned tools and skills - version-controlled prompt templates, parametric input injection, and structured system/user role separation - ensuring prompts are testable, reproducible, and free of implicit context drift.
• Contribute to the team's MCP tooling catalog - implement, test, and document MCP-compatible API integrations (particularly GraphQL/Apollo and developer portal tooling); participate in rollout readiness reviews including SLO definition and support contact documentation.

Requirements

• Be available to collaborate with the team in our Toronto office 2 days per week.
• 5+ years of working knowledge with modern frameworks and languages (REACT & NodeJS)
• Familiarity with OAuth2/OIDC, API key management, and access audit trail patterns
• Experience with SSR applications
• Experience with GraphQL and Apo

Benefits

Additional Information

BIMM is booming, so we're looking for a Senior Full Stack Developer (on contract until December 24, 2026) to join our team! Local candidates (GTHA) will be asked to join us at BIMM HQ (Distillery District) 2 days per week. We are open to remote candidates across Canada - you will be required to work on EST hours.

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