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About the Role

You are building the machine underneath the machine. The patterns you create will define how financial data moves and settles across the ledger, and how safely and quickly everyone else can build on top of it. The work spans core system design, integrations infrastructure, and the abstractions that make a growing codebase coherent. Financial data holds systems to a standard most software never has to meet - and that standard starts here.

Responsibilities

Own the foundational patterns that govern how financial data moves, matches, and settles.
Build the core primitives that product builders extend rather than reinvent: counterparty enrichment, object-arrival matching, transaction reconciliation.
Build abstractions that let engineers and agents contribute safely, without needing to understand the full complexity beneath.
Be the architectural authority the team looks to - reviewing approaches, shaping how new work lands, keeping the codebase coherent.

Requirements

Deep technical foundations and a long track record of building systems that other engineers rely on.
7+ years of engineering experience, with a strong foundation in computer science.
Deep, practical AI integration into your engineering workflow.
Deep experience designing and building distributed systems, core platform primitives, or foundational infrastructure.
Strong instincts for abstraction - you know how to create patterns that are both powerful and hard to misuse.
An understanding of what it means to build on financial data, with non-negotiable requirements for accuracy, auditability, and reliability.
Experience working in a codebase where other engineers depend on your work.
Comfortable operating with autonomy and forming strong technical opinions.
High agency. You identify the problem, form a view, and act.
AI-forward. You've changed how you work because of AI - not as a novelty, but because of how it lets you build.
Strong opinions. You have a perspective and you share it.
Ownership. You feel responsible for outcomes, not just doing your part.
Curiosity. You go deep without being asked.
Optimistic. You believe that things can improve, problems can be solved, and people are generally trying their best.

Skills

AI integration
Distributed systems design
Core platform primitives development
Foundational infrastructure development
Abstraction
Accuracy
Auditability
Reliability
Autonomy
Technical opinions
Fintech experience
Accounting software experience
Financial infrastructure experience
Ledger systems familiarity
Reconciliation familiarity
Payment processing familiarity
Integration infrastructure at scale experience
Workflow engines experience
State machines experience

Location

Toronto

Work Type

In-person
Full-time

Experience Level

7+ years of engineering experience

Education Level

Strong foundation in computer science

Salary/Compensations

170,000–230,000 CAD
plus equity

Benefits

Competitive pay
100% covered health insurance
Work laptop provided
Flexible PTO

About the Company

Alloy River builds agentic applied AI for finance and accounting.
We believe accounting should be intelligent, structured, and operationally decisive.
Our mission is to transform finance from a slow, labor-intensive, reporting function into a real-time, strategic engine for profit and control.
We re-architected the general ledger from first principles, and layered automation, workflow orchestration, and applied AI directly into its core.
We raised over $30m to date from Portage Ventures, Electric Capital, Elad Gil, and angels like Tobi Lütke, Balaji Srinivasan, and many more.
We’re scaling what we do with the best builders, operators, and craftspeople in the world.
Help create a category-defining product with a real impact on business owners.
Work in-person with people who are excellent at what they do and fun to be around.
Join early and shape the future of an industry.

Equal Opportunity

We may use AI to help review candidate applications, but the final decision is always made by a human.