Full Stack Engineer Jobs in Ontario, Canada
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Full-Stack Engineer (Full-time Position)
We’re building a next-generation AI system in the mental health space that bridges the gap between clinical care and scalable digital support. The company is founded by a practicing psychiatrist with 20+ years of clinical experience and multiple successful exits in healthcare technology. We’re operating at the intersection of AI safety, personalization, and human-centered design. Role Overview You’ll work directly with our CTO (architecture) and CEO/clinical founder (product), alongside a Principal AI Engineer who owns the intelligence layer. You own everything else: the full application stack, the infrastructure it runs on, and the API surface that connects the product to our AI system. We move fast with AI-assisted development and have meaningful code already in place — you’re picking up a real codebase and pushing it forward, not starting from zero. What You’ll Own End-to-end application build from architecture through private pilot Frontend and backend for a clinician-facing and client-facing web application API layer that connects to the AI orchestration system Database design, schema management, and migrations (PostgreSQL/Supabase) Auth, security, RLS implementation, and compliance infrastructure Deployment pipelines, CI/CD, and cloud infrastructure (Vercel and beyond) Collaboration with the founder on product design and iteration
Stack React 18 / Next.js PostgreSQL + Supabase REST API design Vercel Git, CI/CD
Who You Are 4+ years of professional experience. You’ve built a production web application from scratch (0→1). Strong React + PostgreSQL — can ship fast and own both frontend and backend. Experience with healthcare data and regulated infrastructure is a hard requirement — you understand what PHI means in practice, not just in theory. Agentic coding fluency is a hard requirement: you use Cursor, Claude Code, Codex, or equivalent as your primary development environment. Ideally you’ve shipped production code this way; strong demonstrated fluency will be considered. Startup experience preferred: comfortable with ambiguity, owns problems end-to-end, ships over specs.
Why Join Competitive salary and meaningful equity, commensurate with experience. Direct collaboration with a clinical founder deeply embedded in the field. IP, roadmap, and pilot sites already in place — ready to build. Small, senior team: your work has direct patient and clinician impact from day one. A chance to define how safe, human-aligned AI shows up in mental health.
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About GrowthSpan
GrowthSpan is a full-service growth agency.
We partner with founder-operated businesses and VC-backed startups that have gotten from 0 to 1 (at least $2M in revenue), and have the potential to get from 1 to 10, but are struggling to do so.
We are like the general contractor for your business. We help you architect a vision for growth and then roll up our sleeves alongside experts we bring in to help you realize your growth potential.
We are involved only as much as you need us to be.
Our goal is to complement your existing team with the capacity and skills to drive results. We can engage on an ad-hoc advisory basis or take full ownership of implementation.
We can keep it small or manage a large team on your behalf.
Whatever you need to succeed.
Headquartered in Toronto, GrowthSpan is a team of experienced business leaders, growth strategists, operators, technology experts and analysts.
Our team and network of experts has subject matter expertise across all business disciplines and deep sector expertise across healthcare, real estate, legal services, online travel, fintech, consulting, and e-commerce.
Our core capabilities include:
→ Cross-functional Executive Advisory → Marketing & Revenue Operations → Product Innovation and Development → Financial Planning & Management → Organizational Design and Build Up → Succession & Exit Planning
We deliver holistic business audits that cut across all aspects of your business, develop a tailored growth strategy just for you, create practical growth plans, and oversee the implementation of them.
Are you struggling to grow?
We should talk.