Backend engineer building scalable AI - native cybersecurity infrastructure for Doppel. Developing software that detects and disrupts phishing, impersonation, fraud, and other digital threats.
About the role
- Senior Software Developer developing systems that accurately record financial transactions at Wealthsimple, Canada's largest fintech. Designing ledger infrastructure and collaborating with finance and product teams.
Responsibilities
- 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.
Requirements
- 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 for financial domain fluency, experience in fintech, banking, or regulated financial services, ERP integrations (e.g., Oracle EBS), event-driven architectures and stream processing (particularly Kafka), and familiarity with regulatory reporting frameworks in Canadian financial services.
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
Job title
Job type
Experience level
Salary
Degree requirement
Tech skills
Location requirements
Report this job
Found something wrong with the page? Please let us know by submitting a report below.
Browser engine specialist developing experimental browser capabilities at Mozilla, the open - source internet technology company. Investigating engine internals, performance, correctness, and AI - agent interaction.
Lead Engineer shaping Xero’s global payments platform and bill - payment products. Building secure, high - throughput services that help small businesses manage cash flow.
Backend engineer scaling Redis and Valkey cache infrastructure for Affirm’s financial technology platform. Automating operations, migrations and self - service workflows for mission - critical data services.
Product Engineering Lead guiding API and React teams building Keet, Tether’s serverless peer - to - peer messaging and video - calling app. Shaping product delivery for global scale.
Product Engineering Lead shaping Keet, Tether’s peer - to - peer messaging and video calling app. Leading API and React frontend teams toward globally scalable consumer features.
Software Engineer Intern building frontend and backend solutions for EQ Bank, Canada’s digital Challenger Bank. Developing APIs, microservices, and web/mobile banking interfaces.
Software Engineer building real - time anti - abuse and detection systems for Resend’s developer email platform. Designing enforcement, ML classifiers, and safeguards against spam, phishing, and account takeover.
Lead software engineer building full - stack CoCounsel integrations with React, TypeScript, Python, and AI tooling. Guiding architecture, delivery, and engineer development at Thomson Reuters.
Part - time Full Stack Engineer building Tether RE’s real estate safety platform across Flutter, React, and NestJS. Developing mobile, web, backend, and partner integrations.