Senior AI System Software Developer (Toronto)

Overview Wealthsimple’s mission is to help everyone achieve financial freedom by making financial services straightforward, transparent, and low‑cost. We are Canada’s largest fintech, trusted by over 3 million clients with more than $100 billion in assets. About the Team The AI Systems team builds Wealthsimple’s first‑party AI tools and platforms. We design, develop, and operate systems that bring AI capabilities directly into the hands of our teams and clients, from intelligent assistants and workflow automation to internal productivity tools powered by large language models. Responsibilities Design, build, and operate first‑party AI tools and platforms that serve internal teams and Wealthsimple clients. Develop full‑stack features across React frontends and Golang backend services, delivering complete, production‑ready systems. Work closely with stakeholders across product, engineering, operations, and business teams to identify opportunities for AI‑driven features and translate them into working software. Build and maintain containerised microservices, ensuring our AI platforms are reliable, scalable, and easy to deploy. Integrate large language models and other AI capabilities into our tools through well‑designed APIs and service layers. Contribute to platform architecture decisions, helping shape how AI systems are built and operated at Wealthsimple. Iterate quickly on new features and prototypes, balancing speed of delivery with long‑term maintainability. Establish patterns and best practices for AI system development that other teams can adopt. Our technologies React for frontend development Golang for backend services Container‑based architecture (Docker, Kubernetes) AWS infrastructure PostgreSQL and Redis for data persistence and caching LLM APIs and AI/ML tooling Datadog, Sentry, and Mixpanel for monitoring and observability AI‑assisted development workflow What you bring Experience building and shipping production software as a full‑stack or backend‑focused developer. Strong proficiency in Golang and React, or demonstrated ability to ramp quickly on both. Hands‑on experience with containerised architectures (Docker, Kubernetes) and cloud‑native deployment patterns. Interest in or experience with AI/ML systems, LLM integrations, or building AI‑powered products. Ability to work across the full stack – from crafting user interfaces to designing APIs and backend services. A product‑oriented mindset: you care about the end‑user experience and work with stakeholders to deliver features that solve real problems. Clear communication with both technical and non‑technical teams. Comfort operating in a rapid‑moving environment where priorities and technology evolve quickly. Nice‑to‑haves Experience building developer tools, internal platforms, or productivity software. Familiarity with LLM APIs (OpenAI, Anthropic, etc.), prompt engineering, or retrieval‑augmented generation (RAG) patterns. Background in building event‑driven or streaming architectures. Experience with CI/CD pipelines and infrastructure‑as‑code. Background in financial services or regulated industries. Benefits Top‑tier health benefits and life insurance Long‑term group savings with employer match through Wealthsimple for Business 20 vacation days, 4 wellness days, and unlimited sick and mental health days per year 90 days away: work outside Canada for up to 90 days per year Employee resource groups, including Rainbow (2SLGBTQ), Women of WS, and Black at WS Hybrid team with over 1,500 employees across North America Inclusion Statement We’re building products for a diverse world, and we need a diverse team to do it well. We strongly encourage applications from everyone, regardless of race, religion, colour, national origin, gender, sexual orientation, age, marital status, or disability status. Accessibility Statement We’re committed to an accessible hiring experience. If you need any accommodations throughout the interview process, please let us know – we’ll work with you to make sure you have what you need. We also welcome any feedback on how we can better accommodate candidates with accessibility needs. AI in Hiring We may use artificial intelligence (AI) tools to support parts of our hiring process, such as reviewing applications, analysing resumes, or assessing responses. These tools assist our team but don’t replace human judgement – all final hiring decisions are made by people. If you have questions about how your data is used, reach out to us. Compensation Range CA$151.2K – CA$189K Apply on Kit Job: kitjob.ca/job/2prl2v