Senior Software Engineer

Marble; Toronto; On-site; CAD 110,000 - 160,000; Full time

Job summary

Marble is building an AI-powered tax assistant and preparation platform that reshapes how accounting firms handle tax season. As a Senior Software Engineer, you will own architecture and technical direction across both frontend and backend to deliver a robust, intelligent user experience.

You’ll work across stacks, mentor teammates, and help define product decisions in a fast-paced startup environment focused on real customer value and scalable data-driven solutions.

Qualifications

• Extensive experience building and scaling production web apps.
• Ownership mindset and strong product focus.
• Comfortable collaborating in whiteboarding and design reviews.
• Bonus: experience with AI products or ETL data pipelines.

Responsibilities

• Be at the cutting-edge of building the AI-first tax prep platform of the future.
• Lead design and implementation of core pieces of our product architecture.
• Build and scale user-facing experiences across the stack.
• Be comfortable operating across our entire stack and product lifecycle end-to-end.
• Mentor engineers and raise the bar on execution as you contribute to best practices.

Skills

Production web apps

Ownership mindset

Customer-focused

Collaborative

Tools

React/Remix

Typescript/Node.js

Postgres

Weaviate

AWS

Kubernetes

Terraform

Airflow

Job description

About Us

Marble is building an AI-powered tax assistant and preparation platform that transforms how accounting firms and their clients handle tax season. We're targeting the pain points of mid-to-large size accounting firms with intelligent tools designed to streamline complex tax workflows. We're early stage, highly collaborative, and deeply focused on solving real, high-impact problems for our customers.

About the Role

We're searching for a talented and driven Senior Software Engineer to help define and build the foundation of our AI-first tax platform. This is a high-impact role for someone who wants ownership over architecture, technical direction, and core product decisions. You will be working across our user-facing apps and backend services to build a robust, intelligent, and intuitive user experience that will redefine tax preparation.

If you enjoy working through ambiguity with a small team and are passionate about leveraging AI tools to solve real-world problems, we want to hear from you.

What You'll Do

• Be at the cutting-edge of building the AI-first tax prep platform of the future

• Lead design and implementation of core pieces of our product architecture

• Build and scale user-facing experiences across the stack

• Be comfortable operating across our entire stack and product lifecycle end-to-end

• Mentor engineers and raise the bar on execution as you contribute to best practices

What We're Looking For

• You have significant experience building and scaling production web applications

• You have an ownership mindset and strong convictions of what it means to build a great product

• You love being focused on solving customer problems and delivering the most value to them

• You enjoy collaborating in person, whether whiteboarding, pairing, or reviewing designs with teammates

Bonus Points

• Working with AI products and tools

• Working with ETL pipelines or managing data at scale

• Working at fast-paced startups with product-led growth

• Experience in the tax, accounting, or fintech space

Tech we use

• Frontend: React, Remix (React-Router)

• Backend: Typescript, Node.js (Fastify), Postgres, Weaviate

• Infra: AWS, Kubernetes, Terraform, Airflow

Why Join Us?

• Build the tax prep platform of the future by making sense of vast amounts of tax data

• Work at the forefront of applying the latest AI strategies to solve real, high-value problems

• Help shape an early-stage product alongside a pragmatic team that gives you ownership and supports you in taking on new challenges.

• Highly competitive compensation, equity, and benefits