Senior Full-Stack Engineer, Acquisition

Company Description

Givebutter is the most-loved nonprofit fundraising and CRM platform, empowering millions of changemakers to raise more, pay less, and give better. Nonprofits use Givebutter to replace multiple tools so they can launch fundraisers and events, use donation forms and donor management (CRM), send emails and text blasts—all in one place. Use of the Givebutter platform is completely free with a 100% transparent tip-or-fee model.

Givebutter has been certified as a Great Place to Work® in 2021, 2022, 2023, and 2024, and is the #1 rated nonprofit software company on G2 across multiple categories.

Our mission is to empower the changemaker in all of us. We believe giving should be fun, so you’ll want to do it again, and we also believe that work should be fun, so that you’ll have the greatest impact. We are excited to hear from talented people who want to work with other talented people in making the world a butter place—and have fun along the way. 

Role Description

Givebutter is looking for a Senior Full-Stack Engineer to join our Growth team, focusing on acquisition. You'll own experiments that directly impact our nonprofit acquisition funnel and activation rates. Working in a high-tempo experimentation culture, you'll ship fast and learn from real user behavior.

Why join Givebutter’s Engineering team?

• Democracy of code – We value equal contributions from all engineers and foster an environment of open discussion on architecture and ideas.

• Focus time – We keep meetings to a minimum. Engineers control their calendars and can block uninterrupted time for focused work.

• Automated CI/CD – Our build and deployment processes are fully automated and hands-off, allowing engineers to focus on problem-solving through code.

• Mission-driven, full stop – You’ll be working with inspiring nonprofits, charities, and organizations that are making a positive impact around the world.

Why join Growth Engineering?

• Direct business impact – Your code directly impacts the number of nonprofits we help succeed.

• Experimentation at scale – Run A/B tests that impact hundreds of thousands of users.

• High autonomy – Join a small team with meaningful input on product and company direction.

Responsibilities

• Design, build, and ship experiments that improve our key business metrics.

• Collaborate with PM, Design, and Marketing to rapidly prototype and test new user experiences.

• Implement robust A/B testing infrastructure and ensure rigor in experiment design.

• Build full-stack features spanning React, Laravel, and data integrations.

• Evaluate and apply AI and machine learning tools – such as LLMs, recommendation systems, or predictive analytics – to drive innovation in product development.

• Analyze experiment results using SQL and analytics tools to derive actionable insights.

• Champion growth engineering best practices while maintaining code quality and system reliability.

• Perform peer code reviews, ensuring that code meets acceptance criteria, adheres to our code guidelines, and follows engineering best practices.

• Contribute to growth team’s experimentation roadmap and technical strategy.

Requirements

• 5+ years of Engineering experience working in-house to build web applications at scale

• Strong proficiency in modern JavaScript/TypeScript and React

• Experience with PHP and MVC frameworks (Laravel preferred but not required)

• Experience with A/B testing, feature flags, and experimentation platforms

• Comfort with SQL and data analysis to measure experiment impact

• Track record of working on cross-functional teams with Product and Design

• Experience debugging code and applications in production

• Ability to balance speed of iteration with code quality and technical debt

Nice to have

• Experience at high-growth B2B SaaS or consumer products (100k+ MAUs)

• Familiarity with analytics platforms (e.g., PostHog, Amplitude, Mixpanel, Heap)

• Experience with or interest in growth metrics, funnels, and conversion optimization

• Background in marketing technology or conversion rate optimization

• Experience with modern deployment practices and AWS infrastructure

More about Givebutter