Sr Software Developer, AI Platform

Wealthsimple Technologies

3d • Hybrid

About The Position

Wealthsimple's mission is to help everyone achieve financial freedom – by making financial services simple, transparent, and low-cost. We're Canada's largest fintech, trusted by over 3 million clients with more than $100 billion in assets. We move fast, we own our work, and we care deeply about the people using our products. If that sounds like you, keep reading.
We're proud of what we've built — and we're just getting started. Read our Culture Manual and learn more about how we work.
About the AI Platform Foundations Team
AI Platform Foundations is a newly formed team within Platform Engineering on a mission to make AI a reliable, governed, and productivity-multiplying force across Wealthsimple's engineering organization. We build and maintain the shared AI tooling that hundreds of developers depend on to ship faster and with more confidence. We also build the guardrails and policy controls that keep teams on the golden path, so innovation happens without introducing risk.
As a founding member of this team, you'll be shaping what AI-assisted engineering looks like at Wealthsimple. You'll work across a polyglot environment of Ruby on Rails, Python, TypeScript, and Java/Kotlin, partnering closely with teams across Platform Engineering and the broader organization to build tooling that is adopted broadly, trusted deeply, and measured rigorously. Your work will directly influence how Wealthsimple's engineers write code, review changes, and ship to production.
In this role you'll have the opportunity to:
Build the shared AI tooling platform from the ground up. As a founding team member, you'll design and implement the shared infrastructure that brings AI-assisted development to every team at Wealthsimple. This includes consolidating one-off and custom LLM tools into a governed, reusable platform that engineering teams can adopt with confidence.
Accelerate developer productivity through AI-powered automation. Build tooling that meaningfully reduces friction in the development lifecycle. From AI-assisted code review and automated PR approvals to intelligent deployment checks, you'll create systems that let developers focus on what matters most.
Design and implement guardrails that keep developers on the golden path. Build policy controls, verification layers, and governance tooling that ensure AI interactions across the organization are safe, compliant, and aligned with Wealthsimple's standards. You'll own the systems that catch issues before they reach production.
Drive measurable adoption across a polyglot engineering organization. Work across teams using Ruby on Rails, Python, TypeScript, and Java/Kotlin to ensure the platform meets developers where they are. Track adoption, satisfaction, and impact rigorously, using data to guide what to build next.
Define the standards and practices for AI-assisted engineering at Wealthsimple. As an early builder on this team, you'll have real influence over how we approach LLM integrations, cost governance, and tooling strategy. You'll establish patterns others build on.
Champion engineering excellence and mentorship. Partner with teams across the organization, share your expertise through documentation and code reviews, and help grow the next generation of developers working in this space.

Requirements

• 7+ years of experience in software development as part of a team, with meaningful experience in platform engineering, developer experience, or developer tooling, and a growing track record building AI-powered or LLM-driven systems.
• Hands-on experience building with LLMs and AI tooling. You've explored and worked in the AI space, whether building LLM-powered developer tools, integrating AI APIs, or experimenting with agents and automation. You understand the practical realities of working with models like Claude in production systems.
• A product mindset for internal platforms. You treat developer tooling as a product, with engineers as your customers. You're driven to understand their pain points, measure adoption and impact, and build solutions that stick.
• Technical versatility across a polyglot stack. Experience with two or more of Ruby, Python, TypeScript, or Java/Kotlin. You're comfortable writing tooling and automation across different language ecosystems.
• Experience building governance, policy, or guardrail systems. You've thought carefully about how to build systems that enforce standards at scale without getting in developers' way.
• Data-informed decision-making. You use metrics to identify opportunities, measure impact, and prioritize. You're comfortable establishing baselines, setting targets, and tracking progress toward goals.
• Strong cross-functional collaboration skills. You build trust with partner teams, communicate clearly about progress and trade-offs, and know how to drive alignment across an organization.

Responsibilities

• Build the shared AI tooling platform from the ground up.
• Accelerate developer productivity through AI-powered automation.
• Design and implement guardrails that keep developers on the golden path.
• Drive measurable adoption across a polyglot engineering organization.
• Define the standards and practices for AI-assisted engineering at Wealthsimple.
• Champion engineering excellence and mentorship.

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

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 501-1,000 employees