Senior Software Developer, Ledger

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 their transactions are properly recorded, and supporting Finance, Accounting, Audit, Brokerage Operations, and Customer Service with the tooling and data they need to do their jobs.
• Contribute to the roadmap by bringing your domain expertise to planning conversations. You'll have meaningful input on what gets built and why, not just how.
• Define what "correct" looks like for ledger systems, and build the observability, alerting, and reconciliation tooling to prove it continuously.

What we're looking for

• Senior software engineer with strong backend experience and a track record of building reliable, high-correctness systems in Java, Kotlin, or similar JVM languages.
• Solid SQL skills and comfort working across relational databases at scale.
• Experience building or contributing to internal tooling, ideally with some frontend range in React.
• A collaborator across disciplines who builds trust with Finance, Accounting, and Compliance teams, knows how to ask the right questions, and turns what they hear into software that solves the real problem.
• A bias toward clarity and correctness. In ledger systems, clever is rarely better than clear. You write code that's easy to audit, easy to reason about, and easy to verify.
• Comfort with ambiguity. You can take a vague "our reconciliation breaks every month-end" and walk out with a root cause, a proposal, and a plan.
• End-to-end ownership. You work autonomously across the full development lifecycle, take ownership of improvements that reduce toil, and influence technical decisions within your domain.
• An AI-first mindset. You leverage AI tools to accelerate development and raise the bar for code quality, with hands-on experience building or contributing to agentic workflows and intelligent automation.

Bonus points

• Financial domain fluency — you understand double-entry accounting, can read a chart of accounts, and know why precision and immutability matter in ledger design.
• Experience in fintech, banking, or regulated financial services, where correctness isn't optional and audit trails aren't an afterthought.
• Experience with ERP integrations (e.g., Oracle EBS).
• Familiarity with event-driven architectures and stream processing, particularly Kafka.
• Familiarity with regulatory reporting frameworks in Canadian financial services.
• Prior work on event-sourced or append-only ledger architectures.