Senior Backend Engineer, Payments

About the Company

Day One Partners is a search firm that partners with venture capital firms to help build high-growth startups. We lead confidential searches for leadership and critical roles across a range of company stages, industries, and functions.

About the Role

We're hiring a Senior Backend Engineer, Payments to join a profitable, high-growth consumer technology company building products used by a global audience. You'll join a backend engineering team responsible for building and scaling the infrastructure powering subscriptions, payments, and the broader member experience. This is a high-ownership individual contributor role for someone with deep experience in Apple StoreKit 2, server-side subscription billing, and scalable backend systems .

You'll work closely with engineering, product, and cross-functional teams to design, build, and operate critical services that support a growing consumer platform. We're looking for someone who enjoys solving complex technical challenges, takes ownership of their work, and can drive projects from initial architecture through production.

What We're Building

We're building a consumer technology platform focused on delivering seamless digital experiences to a highly engaged global user base.

A critical part of the platform is the infrastructure that manages payments, subscriptions, and the customer lifecycle.

Our engineering challenges include:

• Apple Payments & Subscriptions: Building and maintaining reliable subscription infrastructure using StoreKit 2, App Store Server APIs, and server-side billing integrations.
• Subscription Lifecycle Management: Handling purchases, renewals, cancellations, refunds, billing failures, and user entitlements.
• Payment Reliability: Designing systems for transaction verification, server notifications, webhook processing, reconciliation, and failure recovery.
• Scalable Backend Infrastructure: Developing reliable distributed services and APIs that support a growing consumer platform.
• Engineering Productivity: Leveraging AI-powered development tools to improve engineering velocity while maintaining strong technical judgment and code quality.

You'll have meaningful ownership over critical backend systems and the opportunity to influence architecture, engineering practices, and product development.

Responsibilities

• Design, build, and maintain scalable backend services supporting payments, subscriptions, and member lifecycle workflows.
• Own critical components of the payment infrastructure, including Apple StoreKit 2, App Store Server APIs, transaction verification, subscription management, and reconciliation .
• Drive technical projects end-to-end, from system architecture and implementation through testing, deployment, and production operations.
• Collaborate with engineering, product, and cross-functional teams to deliver reliable, user-focused features.
• Improve backend performance, reliability, and maintainability through code reviews, CI/CD, observability, and engineering best practices.
• Leverage AI development tools to improve engineering productivity while maintaining strong technical judgment and code quality.

Qualifications

• 5+ years of professional backend software engineering experience , with a track record of building and operating scalable production systems.
• Strong production experience with Apple StoreKit 2 , including in-app purchases, subscriptions, and integration with backend billing services.
• Deep understanding of server-side Apple payment infrastructure , including App Store Server APIs, server notifications, transaction verification, subscription lifecycle events, and reconciliation.
• Production experience with Stripe payments and subscriptions for a B2C product.
• Strong backend engineering fundamentals, including system design, distributed systems, API development, and cloud architecture.
• Experience building and scaling backend services in a startup, high-growth company, or fast-moving engineering environment.
• Ability to independently own complex technical projects from design through production deployment.

Preferred Skills

• Strong proficiency in Node.js and TypeScript .
• Experience building payment and subscription infrastructure for consumer-facing iOS applications.
• Familiarity with Apple subscription renewals, refunds, billing retry flows, entitlement management, and App Store Server Notifications V2.
• Experience with MongoDB, PostgreSQL, or similar databases.
• Background building products with large, active consumer user bases.
• Experience with cloud infrastructure and distributed backend services.
• Strong product instincts and an understanding of how engineering decisions affect user experience, retention, and business outcomes.

Pay Range and Compensation Package

• Total Compensation: Competitive base + equity package with significant upside.
• Workplace: Fully remote.
• Employment: Full-time.

The company offers a comprehensive benefits package, including medical and dental coverage, generous paid time off, parental leave, and additional lifestyle and wellness benefits.

You'll join a collaborative, product-focused engineering organization that values technical excellence, autonomy, continuous learning, and meaningful ownership.

Equal Opportunity Statement

Day One Partners is committed to fostering a diverse and inclusive environment. All qualified applicants will receive consideration for opportunities without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.