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. We're growing the Core Balances team and looking for a Senior Software Developer to take real ownership of the services at the heart of how Wealthsimple tracks client money. You'll join a small, high-trust group of senior engineers and own meaningful scope from early on - designing and building the backend systems that track balances, reserve assets, and record financial activity in real time.

It's backend-heavy, consequential work: these services sit on the critical path for nearly every product at Wealthsimple, and the rest of the company trusts them to be both fast and correct. Own meaningful scope end-to-end, from technical design through to running your work reliably in production. Solve genuinely hard problems around real-time correctness, low latency, and high availability: write paths that can't be slow, event consumers that can't fall behind, and database contention that shows up exactly when volume peaks.

These systems have grown alongside Wealthsimple itself, from a single product to an entire financial ecosystem, and a big part of the work ahead is reshaping them to fit the company we are now - consolidating overlapping services and data models,



establishing a single entry point for financial activity, isolating failure domains so one slow calculation can't degrade everything around it, and making recovery and backfill fast and safe. Raise the bar on quality and operational excellence through thoughtful design, code review, and a healthy sense of production ownership. Use AI-assisted tooling to ship faster and more safely.

We treat building with AI as part of how we work, and we're always figuring out how to do it well. Several years (5+) of skilled software engineering experience, with a track record of building and operating critical production systems that people or businesses depend on. Strong backend engineering skills and sound judgment about system design, reliability, and trade-offs.

Solid experience building services that are highly available and low-latency - and the instincts that come from having kept one running under real load. We work primarily in Kotlin on the JVM, with Kafka and GraphQL in the mix - strong Java experience translates well, and deep experience in a comparable stack matters more than an exact match. We'll help you ramp on ours.

Strong software quality habits: you write well-tested, maintainable and observable code. Enthusiasm for AI-assisted development,



and interest in helping shape what excellent, rigorous AI-assisted engineering looks like on our team. Familiarity with ledgers, reconciliation, or financial-correctness problems.

Depth in relational database performance at scale - Postgres, connection pooling, replication, and diagnosing contention under load. You're collaborative and generous by default: you share what you know, invest in the people around you, and help the whole team get better. 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. #

📌 Senior Software Developer, Book of Record (Core Balances) (Toronto)
🏢 Wealthsimple Technologies
📍 Toronto