Wealthsimple is Canada's leading financial innovator. The company offers a full suite of simple, sophisticated financial products across managed investing, do-it-yourself trading, cryptocurrency, tax filing, spending and saving. Wealthsimple currently serves more than 4 million Canadians and holds over $155 billion in assets under administration. The company was founded in 2014 by a team of financial experts and technology entrepreneurs, and is headquartered in Toronto, Canada.

At Wealthsimple, the Build Platform team is on a mission to make developing great software fast, intuitive, and enjoyable. We believe engineers should focus on building incredible features for our clients, not fighting their workplace. Our internal developers are our customers, and their success is our primary measure of impact.

As a Developer on our team, you won't just be building tools; you'll be shaping the entire developer journey at Wealthsimple. You will support a diverse engineering organization that uses Ruby, Python, Kotlin, and TypeScript to build the future of finance. Your work will directly empower hundreds of developers to ship high-quality, secure code to millions of users with confidence and speed.

The most interesting problem on our plate right now is AI. That makes verification the constraint on the whole company: reproducible environments, test signal you can believe, and feedback loops tight enough that an agent catches its own mistakes before a human ever sees them. Building that layer is the team's biggest bet, and this role sits at the centre of it.





You'll roll out containerized development environments across hundreds of services so that engineers and coding agents alike get reproducible, isolated, fast environments to work in. This eliminates "works on my machine" and it is the foundation everything AI-native depends on.

Build the verification layer for AI-native development. As agents generate more of our code, proving a change is safe becomes the constraint on how fast the whole company ships. Make test signal fast, deterministic, and actionable. You'll attack flake detection, test selection, and failure output that is legible enough to act on without a person interpreting it.

Solve the hard testing problems underneath all of it. You'll build robust backend mocking solutions, and enable isolated testing of asynchronous, event-driven workflows in ephemerals environments.

You'll help build automated scorecards that give every team clear, actionable insight into the health of their services, covering everything from dependency management to monitoring and scalability.

7+ years of experience in software development as part of a team, preferably a platform-oriented team.

- Ruby, Python, Typescript, Kotlin.
- Experience designing, building, and maintaining internal libraries, frameworks,



or tooling used by other engineering teams.
- Hands-on experience with AI-assisted development. You've used coding agents on real production work, you know where they break down, and you have opinions about what makes them effective.
- A builder's instinct for AI tooling. You believe in making your colleagues successful and enjoy coaching other developers.
- A data-informed approach to decision-making. 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*

Employee resource groups, including Rainbow (2SLGBTQ), Women of WS, and Black at WS

Technology & Innovation at Wealthsimple: That means we're always looking for better ways to work - whether that's new tools, AI, or rethinking how we approach a problem. We don't expect you to have all the answers, but we do expect curiosity and a willingness to evolve alongside the products we're building.

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.

AI in Hiring: We may use artificial intelligence (AI) tools to support parts of our hiring process, such as reviewing applications, analyzing resumes, or assessing responses. If you have questions about how your data is used, reach out to us.

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📌 Senior Software Development Engineer - Platform Engineer (Toronto)
🏢 Alt
📍 Toronto