Role Overview

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. Product builders will build on it. Agents will depend on it. Future teammates will inherit it. It is some of the most important work we do. Financial data holds systems to a standard most software never has to meet - and that standard starts here.

What You'll Work On

• Own the foundational patterns that govern how financial data moves, matches, and settles - the layer everything else depends on.
• 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.

What We're Looking For

This role requires deep technical foundations and a long track record of building systems that other engineers rely on. It is not a role for generalists who have touched many things lightly. It is a role for someone who has gone very deep, cares deeply about correctness, and understands why the foundational layer matters as much as what runs on top of it.

• 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.

Bonus experience includes:

• Experience in fintech, accounting software, or financial infrastructure.
• Familiarity with ledger systems, reconciliation, or payment processing.
• Experience building integration infrastructure at scale.
• Experience with workflow engines or state machines.

Our Tech Stack

• Tech: Typescript, Go, React, PostgreSQL, MongoDB, Redis, GCP, Pulumi, Kubernetes
• Product: Agentic IDEs (Cursor, Claude Code, Codex, etc.), Linear, Figma

How We Work

• Small, high trust team that builds together in-person every day.
• Product, engineering, and end-user collaboration is tight and direct.
• We prioritize structured thinking and clear abstractions.
• We optimize for long term architectural leverage over short term hacks.
• We ship quickly but care deeply about correctness.
• AI is a core part of how we work - not just what we build, but how we build it.

Why Join Alloy River

• 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.

What We Look For

We hire high agency, AI-forward builders. The title or background matters less than the pattern underneath it.

• High agency. You don't wait to be pointed. 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. Your first instinct is to reach for the agent, not the keyboard.
• Strong opinions. You have a perspective and you share it - in writing, in meetings, in Slack. You think out loud and you're not afraid to change your mind in public.
• Ownership. You feel responsible for outcomes, not just doing your part. You've built something that didn't exist before you arrived, and you didn't let go until it was right.
• Curiosity. You go deep without being asked. You ask the questions others skip. You tinker.
• Optimistic. You believe that things can improve, problems can be solved, and people are generally trying their best. This is the foundation of how you work and how you treat people.

Compensation & Location

This role pays $170,000-$230,000 CAD, plus equity. This role is in-person full-time at our gorgeous office in Liberty Village, Toronto.

Benefits

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

AI Usage Policy

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