---
title: 'Senior Fullstack Engineer - Growth at Overflow'
canonical: 'https://feeny.ai/job/senior-fullstack-engineer-growth-overflow-remote-2gmj82h0zkps'
type: 'job'
last_seen: '2026-09-15'
---

# Senior Fullstack Engineer - Growth at Overflow

- **Company:** Overflow
- **Location:** Remote
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-07-14
- **Last confirmed live:** 2026-09-15
- **Apply:** https://jobs.ashbyhq.com/overflow/6b17a2cb-7582-47ea-ba64-261d5e90404c

## Job description

## Who We Are

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.

Our Founding Principles 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.

## How We Work

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. We maintain offices in Los Gatos, CA and Birmingham, AL for team collaboration, coworking, meetings, and intentional in-person connection.

## About the Role

As a Senior Fullstack Engineer on our Growth team, you will be the technical engine behind our Product-Led Growth (PLG) initiatives. Your work will directly impact how organizations discover, adopt, and expand their use of Overflow. You will design and build the critical pathways that allow our customers to scale their generosity effortlessly. This includes architecting seamless self-service onboarding flows, creating frictionless plan upgrade paths, and standing up high-converting checkout experiences across new e-commerce touchpoints. You will sit at the intersection of engineering, product, and revenue, turning complex business requirements into intuitive, reliable, and scalable product features.

## What You Will Do

- Drive Product-Led Growth: 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).
- Engineering Excellence: Write clean, well-tested, and maintainable code, actively contributing to engineering standards and rigorous code reviews.
- Cross-Functional Collaboration: 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.
- Mentorship & Reliability: Mentor junior engineers, help elevate the team's technical capabilities, and participate in on-call rotations to ensure the high availability of our systems.

## What You Should Have

- Core Experience: 5+ years of fullstack software engineering experience
- Technical Stack: Strong proficiency in React, TypeScript, and Node.js (or similar modern backend technologies).
- Systems Design: Deep experience designing and building scalable RESTful APIs and working with relational databases.
- Growth Mindset: A strong product sense and an understanding of product-led growth mechanics, conversion funnels, and user-centric design.
- Leadership & Ownership: Demonstrated ability to lead technical initiatives, make sound architectural decisions, and operate with a strong accountability mindset.

It'd Be Nice If You Had

- E-commerce & Billing Experience: Hands-on experience integrating with billing and subscription platforms or building custom e-commerce checkout experiences.
- Fintech Context: Experience in fintech, payments infrastructure, or donation platforms.
- Startup DNA: Experience at a Series B or growth-stage startup, thriving in a fast-paced, iterative environment.

Our Compensation Philosophy The base salary range for this position is $120k – $200k, based on Carta Total Compensation benchmarks for role, geography, and function. Total compensation may also include equity, performance-based bonuses (for eligible roles), and a comprehensive benefits package.

## Benefits & Perks

- 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
- Team retreats and intentional in-person gatherings throughout the year

Overflow is proud to be an equal opportunity employer and is committed to building a diverse and inclusive team.

## About Overflow

## Company Overview
- **One-liner**: Overflow provides a modern giving platform that enables nonprofits and churches to accept donations in various forms including stock, crypto, and traditional payment methods, while also offering engagement tools like Tap to Give.
- **Entity Type**: Private (Series B)
- **Headquarters**: San Jose, California, United States (with additional offices in Birmingham, Silicon Valley, Canada, Costa Rica, and Mexico)
- **Founded**: 2019
- **Founders**: Bill Stone (Founder & CEO)

## Core Business
- **Primary industry/industries**: Financial Services / Fintech / Nonprofit Technology
- **Target customers**: B2B — churches, nonprofits, and charitable organizations of all sizes
- **Mission or purpose statement**: "Inspire the world to give" by making giving "the easiest thing we do"

## Products & Services
- **Overflow Giving Platform**: A unified platform allowing donors to give via card, ACH, Apple/Google Pay, stock, crypto, and RoundUps™. Integrates with existing CRMs and tech stacks.
- **Overflow Tap**: A suite of NFC tap products (cards, keychains, wristbands) that donors can tap to give, register, connect, serve, check-in, or text — fully customizable with organizational branding.
- **Overflow AI**: Launched May 2025, an AI-powered feature set to enhance donor engagement and platform intelligence.
- **ExpressGive™**: A feature that activates new givers quickly, reportedly driving significant increases in online giving.
- **Generosity University**: An educational resource launched in 2020 to help organizations grow giving.

## Market Standing
- **Valuation**: $80.1M (most recent disclosed valuation)
- **Key Metric**: Annual Revenue of $26.7M in 2025; Total Funding of $30M
- **Notable Investors/Partners**: Wesleyan Investment Foundation (led Series B), R7 Partners & Salesforce Ventures (led Series A), Uncork Capital & Craft Ventures (Seed), Village Global & On Deck (Pre-Seed)
- **Growth Signals**:
  - 94 employees as of 2026 (up from 46, representing ~104% growth)
  - 12% average increase in annual giving for churches migrating to Overflow
  - 2.5x average donation through Overflow compared to national average
  - 150% increase in stock giving on the platform
  - 800% increase in online giving for some clients
  - $200K+ raised in stock in 4 days by one client
  - Acquisitions: Novity (to scale Overflow Tap), Willfora (expansion into Canada), DEKA (payment processor)
  - Website traffic: 161,227 monthly visits, +62.9% yearly growth

## Competitive Advantages
- **Multi-asset giving**: Uniquely enables stock, crypto, and traditional donations in one platform — a key differentiator for wealth held in diverse assets.
- **Dedicated migration team**: White-glove service for data migration, removing a major barrier for organizations switching platforms.
- **Integrated engagement tools**: Tap products go beyond giving to include check-in, registration, and connection — creating a broader ecosystem.
- **CRM integrations**: Works with existing tools (Salesforce, etc.) so organizations don't need to replace their entire tech stack.
- **Proven ROI**: Clear metrics (12% giving increase, 2.5x average donation) provide compelling evidence for prospects.

## Strategic Focus
- **Expansion into Canada**: Via the Willfora acquisition, opening a new geographic market.
- **AI integration**: Overflow AI (launched May 2025) signals a push toward intelligent, data-driven giving experiences.
- **Scaling Tap products**: The Novity acquisition and continued investment in NFC tap technology suggests a focus on physical/digital hybrid engagement.
- **Continued product innovation**: The company's history of rapid feature releases (RoundUps, ExpressGive, AI) indicates a strong product-led growth strategy.

## Why Work Here
- **Culture**: Described as mission-driven with a focus on "inspiring the world to give." The company emphasizes a supportive, innovative environment.
- **Growth trajectory**: Rapidly scaling (94 employees, $26.7M revenue, multiple acquisitions) — offers significant career growth opportunities.
- **Remote/hybrid policy**: Multiple office locations (San Jose HQ, Silicon Valley, Birmingham, Canada, Costa Rica, Mexico) suggest a distributed team with in-person hubs.
- **Notable perks**: 5.0/5.0 employer rating on LinkedIn (based on 1 review) with perfect scores across Work-Life, Compensation, Culture, and Career.
- **Engineering culture**: Technical team of 11 (10% of workforce) with a modern tech stack including React, React Native, OpenAI, Stripe, Salesforce, and Plaid. Active hiring for Solutions Engineers and Enterprise Support.
- **Open positions**: 5 active job postings including Business Development Representative, Solutions Engineer, Strategic Partnerships & Events Manager, and Enterprise Support Specialist.

## Sources
1. [overflow.co](https://www.overflow.co/)
2. [overflow.co/about](https://www.overflow.co/about)
3. [linkedin.com/company/overflow-co](https://www.linkedin.com/company/overflow-co)
4. [getlatka.com/companies/overflow.co](https://getlatka.com/companies/overflow.co)
5. [signalhire.com/companies/overflow](https://www.signalhire.com/companies/overflow)
6. [jobs.ashbyhq.com/overflow](https://jobs.ashbyhq.com/overflow)

## Other roles at Overflow

- [Program Manager, Generosity University](https://feeny.ai/job/program-manager-generosity-university-overflow-remote-j9brqpb70a5f)
- [Senior Data Engineer](https://feeny.ai/job/senior-data-engineer-overflow-remote-mvshba7mj269)
- [Product Manager (Growth)](https://feeny.ai/job/product-manager-growth-overflow-remote-3qper4cm859n)
- [DevSecOps Engineer](https://feeny.ai/job/devsecops-engineer-overflow-remote-fnhnmdg413f5)
- [Business Operations Lead](https://feeny.ai/job/business-operations-lead-overflow-remote-wsyprjdqgb63)
- [Business Development Representative](https://feeny.ai/job/business-development-representative-overflow-remote-7j940ept7mts)
- [Account Executive](https://feeny.ai/job/account-executive-overflow-remote-wz3h22jm46k0)