Overflow is a Series C, growth-stage technology company on a bold mission: to inspire the world to give. We're a vertical fintech and SaaS platform unlocking more ways to give — cash, stock, crypto, and beyond — through a beautifully designed ecosystem built for high-impact churches, nonprofits, and mission-driven institutions.

Backed by Uncork Capital, Craft Ventures, Salesforce Ventures, R7, and WIF (one of the largest lenders to faith and philanthropic organizations in the country), we're building the infrastructure that makes generosity frictionless at scale.

Overflow was founded on the belief that generosity transforms people and communities. Inspired by Proverbs 11:24 — "The world of the generous gets larger and larger" — we operate with integrity, stewardship, service, and excellence.

Overflow operates with a flexible work model. While there is no company-wide in-office requirement, some teams may establish in-person collaboration rhythms based on their function, goals, and team needs.

As a Senior Fullstack Engineer on our Growth team, you will be the technical engine behind our Product-Led Growth (PLG) initiatives. You will design and build the critical pathways that allow our customers to scale their generosity effortlessly. Architect and build robust, end-to-end features that enable intuitive customer self-onboarding, seamless subscription plan upgrades, and highly optimized e-commerce checkout flows.

- Full-Stack Ownership: Own complete features from database schema and RESTful API design (Node.js) through to a polished, highly responsive frontend implementation (React/TypeScript).
- Write clean, well-tested, and maintainable code, actively contributing to engineering standards and rigorous code reviews.




- Partner closely with Product, Design, and Data to iterate quickly, run experiments (A/B tests), and deliver high-quality user experiences that drive conversion.
- Architectural Strategy: Identify technical debt and contribute to architectural improvements that enhance the reliability, scalability, and speed of our Growth product surfaces.
- Mentor junior engineers, help elevate the team's technical capabilities, and participate in on-call rotations to ensure the high availability of our systems.

Core Experience: 5+ years of fullstack software engineering experience

- Technical Stack: Strong proficiency in React, TypeScript, and Node.js (or similar up-to-date backend technologies).
- Systems Design: Deep experience designing and building scalable RESTful APIs and working with relational databases.
- Demonstrated ability to lead technical initiatives, make sound architectural decisions, and operate with a strong accountability mindset.

E-commerce & Billing Experience: Hands-on experience integrating with billing and subscription platforms or building custom e-commerce checkout experiences.

- Startup DNA: Experience at a Series B or growth-stage startup, thriving in a fast-paced, iterative environment.

Total compensation may also include equity, performance-based bonuses (for eligible roles), and a comprehensive benefits package.

Competitive base salary with equity eligibility

- Medical, dental, and vision coverage for employees and dependents
- Generous paid time off and company holidays
- Paid parental leave
- 401(k) retirement plan
- Dedicated mental health and therapy stipend to support personal well-being
- Overflow is proud to be an equal opportunity employer and is committed to building a diverse and inclusive team.

📌 Senior Full Stack Developer, Billing (Canada)
🏢 overflow
📍 Canada