Senior Software Developer, Ledger

BUILD SOMETHING PEOPLE LOVE 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 $125 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 proud of what we've built — and we're just getting started. Read our Culture Manual https://www.wealthsimple.com/en-ca/culture and learn more about how we work https://www.wealthsimple.com/en-ca/careers. WHY THIS ROLE EXISTS As Wealthsimple's product suite grows, so does the complexity of our financial infrastructure. More products mean more transaction types, more regulatory obligations, and more surface area where a ledger inconsistency can cascade into a real problem. We're investing in senior engineers who can hold that complexity — people who understand double-entry accounting as well as they understand distributed systems, and who can collaborate with Finance as naturally as they can with a product team. WHAT YOU'LL DO - Own core ledger infrastructure: design, build, and evolve the systems that record financial transactions accurately and durably, using Java/Kotlin in a microservices architecture. - Model financial correctness by translating double-entry bookkeeping principles and accounting logic into clean, testable, auditable code that Finance and Compliance can trust. - Handle high-throughput transaction processing and design systems that maintain strong consistency guarantees under load without sacrificing performance. - Drive audit trails and compliance reporting so every transaction is traceable, every state change is logged, and every report is reproducible. - Collaborate broadly across Wealthsimple — partnering with product teams to ensure thei