Senior Fullstack Software Engineer (AI)

TL;DR

Senior Fullstack Software Engineer (AI): Building and scaling innovative financial products within Affirm's Zero to One innovation lab with an accent on rapid prototyping, AI-native development, and full-stack system design. Focus on leveraging agentic workflows, automation, and scalable backend architectures to validate new business opportunities from concept to real-world testing.

Location: Must be based in the United States

Salary: $173,000–$255,000

Company

Affirm is a fintech company reinventing credit by providing flexible, transparent payment solutions without hidden fees.

What you will do

• Own and deliver quarterly goals while leading engineers through ambiguous, open-ended problems.
• Collaborate with product management, design, and analytics to define technical approaches and trade-offs.
• Develop and maintain scalable backend systems and declarative web interfaces.
• Leverage AI tools and agentic workflows to accelerate prototyping and development cycles.
• Foster a culture of quality by setting design standards and mentoring team members.
• Monitor system metrics and support on-call efforts to ensure service availability.

Requirements

• 4+ years of professional software engineering experience.
• Must be based in the United States.
• Experience designing and launching backend systems using Python, Kotlin, AWS, MySQL, and Kubernetes.
• Experience shipping web applications with React or Vue.
• Proficiency in leveraging AI-assisted development and agentic coding workflows.
• Strong verbal and written communication skills for cross-functional collaboration.

Culture & Benefits

• 100% subsidized medical, dental, and vision coverage for employees and dependents.
• Generous stipends for technology, food, lifestyle, and family-forming expenses.
• Competitive vacation and holiday schedules.
• Employee Stock Purchase Plan (ESPP) with discounted share options.
• Remote-first work environment with a focus on autonomy and rapid execution.