Senior Software Engineer, Backend – Financial Platforms

🕒 September 13, 2025

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Affirm

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

Founded 2012

💳 Fintech

👥 B2C

🛍️ eCommerce

💰 Post-IPO Equity on 2021-01

Fintech • B2C • eCommerce

Affirm is a financial technology company that offers a 'Buy Now, Pay Later' service, allowing consumers to make purchases and pay for them over time with flexible payment plans. Affirm eliminates hidden fees and compound interest, providing clear terms and conditions for its users. The company also offers the Affirm Card, a debit card that allows users to request to pay over time for larger purchases or pay in full for smaller ones. Affirm partners with various retailers across multiple categories, including electronics, apparel, and travel, providing customers with the convenience of paying over time at checkout both online and in physical stores. Affirm's services are integrated with Apple Pay, enabling customers to make payments seamlessly from their iPhone or iPad.

📋 Description

• Focus on purchase protection, including disputes and refunds, as part of the Servicing International team supporting global expansion • Own and deliver quarterly goals for your team and lead engineers through ambiguity to solve open-ended problems • Collaborate with product management, design, and analytics during ideation and technical decision-making, articulating constraints and trade-offs • Proactively identify and lead resolution of project, process, technology, or business issues • Support operations and availability by creating and monitoring metrics, escalating when needed, and participating in on-call efforts • Foster a culture of quality and ownership by setting or improving code review and design standards and advocating broadly • Help develop talent on your team by providing feedback, guidance, and leading by example • Partner closely with European engineering counterparts and global Servicing Engineering organization to build cohesive, scalable solutions

🎯 Requirements

• You have a total of 4+ years of experience as a software engineer • Experienced in designing, developing and launching backend systems at scale using technologies like Python, Kotlin, AWS, MySQL, and Kubernetes • Experience shipping web apps using declarative UI frameworks like React or Vue • Experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design • Write high quality code that is easily understood and used by others • Proficient at making significant changes in a large code base and have developed a suite of tools and practices that enable safe changes • Take ownership of your growth and proactively seek feedback • Strong verbal and written communication skills for collaborating with a global engineering team • On-call rotation is required • Must be based in Spain (visa sponsorship available)

🏖️ Benefits

• Base pay is part of a total compensation package that may include monthly stipends for health, wellness and tech spending • 100% subsidized medical coverage, dental and vision for you and your dependents • Flexible Spending Wallets for tech, food and lifestyle • Away Days - wellness days to take off work and recharge • Learning & Development programs • Parental benefits • Employee Resource & Community Groups • ESP base pay range per year: €85,000 - €115,000 • ESPP - An employee stock purchase plan enabling you to buy shares of Affirm at a discount • Time off - competitive vacation and holiday schedules • Home/remote-first work flexibility • Visa sponsorship available (requires candidate to be based in Spain)