Senior Software Engineer, Backend (Identity International) at Affirm

JobFluent; United States; Remote; USD 96,000 - 136,000; Full time

Benefits offered by this job

Health coverage

Monthly tech stipends

ESP equity plan

Flexible time off

Job summary

Affirms is seeking a Senior Software Engineer, Backend (Identity International) to build scalable identity services for global markets from Madrid or remote. You will own quarterly goals, design across system boundaries, and mentor engineers to improve code quality and uptime.

You will work hands-on in Kotlin and Python, drive architectural decisions, and collaborate with product, design and analytics to deliver reliable, scalable solutions for Identity across multiple regulatory environments.

Qualifications

• 4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin.
• Experience building highly available distributed systems with AWS, MySQL and Kubernetes.
• Ability to define a technical plan for delivery of a significant feature with an elegant design.
• Proven track record of making safe, large-scale code changes and creating useful tooling.

Responsibilities

• Own and deliver quarterly goals for your team, guiding engineers through ambiguity.
• Collaborate with product, design and analytics from ideation to delivery, articulating constraints and risks.
• Identify and lead efforts to resolve project, process, or technology issues.
• Support operations and availability by creating metrics, monitoring and on-call practices.
• Raise code quality and design standards and advocate for them beyond your team.
• Mentor teammates and contribute to hiring and onboarding.

Skills

Python

Kotlin

AWS

MySQL

Kubernetes

Distributed systems

Code quality

On-call

Job description

Senior Software Engineer, Backend (Identity International) in Madrid or Remote

At Affirms we exist for the moments that matter-giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most.

Affirm's Identity team is mission-critical to the customer checkout experience. When a customer chooses Affirms one of the first steps is an identity check, and our ability to make the right decision directly impacts conversion, revenue, fraud exposure, and regulatory compliance. Our team owns Identity for all markets outside North America, playing a key role in Affirms international expansion. We are responsible for KYC, user lifecycle management, and identity decisioning across multiple regulatory environments. This work is about shaping how Affirms adapts its core Identity platform to new market dynamics, customer expectations, and compliance requirements.

We are a team of six engineers based across Spain and Poland. We are looking for a Senior Software Engineer who can turn ambiguous business and customer problems into reliable, well-designed technical solutions.

In this role, you will help shape our quarterly technical direction, translate team goals into concrete projects, and identify cross-cutting risks, tradeoffs, and opportunities. You should be comfortable designing across system boundaries, driving collaboration with partner teams, and advocating for technical investments that improve long-term execution. We're looking for someone who takes ownership beyond shipping code: raising code quality and review standards, making performance, availability, and scale tradeoffs explicit, and improving the operational health of the systems they own. You'll help reduce toil, create useful playbooks, mentor engineers, support new hires and interns, and contribute to high-signal hiring.

Most importantly, we're excited to work with someone who leaves things better than they found them, communicates clearly across audiences, uses customer feedback to influence technical plans, and helps the team continuously improve.

This is a deeply technical, hands-on coding role where feature velocity and operational excellence go hand-in-hand. You'll spend most of your week in the codebase - leveraging AI tools to write robust Kotlin and Python, ship impactful features, investigate complex production issues, and keep our systems rock-solid and reliable. This is a high-visibility, high-impact role for someone who wants to work on foundational systems that directly enable Affirms global growth.

What You’ll Do

• You will be responsible for owning and delivering quarterly goals for your team, leading engineers on your team through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery.
• You will support your peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
• You will proactively identify project, process, technology or business issues, advocate for them, and lead in solving them.
• You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting "keep the lights on" & on-call efforts.
• You will foster a culture of quality and ownership on your team by setting or improving code review and design standards for your team, and advocating for them beyond your team through your writing and tech talks.
• You will help develop talent on your team by providing feedback and guidance, and leading by example.

On-Call Rotation - There would be an on-call rotation for this role as a requirement.

What We Look For

• You have 4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin.
• You have a track record of developing highly available distributed systems using technologies like AWS, MySQL and Kubernetes.
• You have experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design. You write high quality code that is easily understood and used by others.
• You are proficient at making significant changes in a large code base, and have developed a suite of tools and practices that enable you and your team to do so safely.
• Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
• You have strong verbal and written communication skills that support effective collaboration with our global engineering team.

Compensation & Benefits

Pay Grade - N

Equity Grade - 4

Employees new to Affirms typically come in at the start of the pay range. Affirms focuses on providing a simple and transparent pay structure which is based on a variety of factors, including location, experience and job-related skills.

Base pay is part of a total compensation package that may include monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents). In addition, the employees may be eligible for equity rewards offered by Affirms Holdings, Inc. (parent company).

ESP base pay range per year: €86,000 - €122,000

Additional benefits include:

• 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

Location - Remote Spain

We are able to offer visa sponsorship for this role, but do require that someone is based in Spain for the role.

Remote-first with flexibility built in

Affirms is proud to be a remote-first company. Most roles can be done from almost anywhere within the country of employment. Some positions may occasionally require in-person work at an Affirms office, and a few are office-based due to the nature of the work. All new hires will be invited to attend an in-person onboarding experience.

Benefits designed for you

• Health coverage at no cost: We cover 100% of premiums for employees and their dependents.
• Spending stipends: Monthly stipends support your tech setup, and the ability to choose health and wellness options that are right for you.
• Time off to recharge: Flexible time off and generous holiday calendars help you rest when you need to.
• Own a piece of what you build: Our employee stock purchase plan (ESPP) lets you buy Affirms stock at a discount.

We're committed to providing an inclusive interview process, including accommodations for candidates with disabilities. If you need support, we're happy to help.

For positions based in San Francisco or Los Angeles: Affirms considers qualified applicants with arrest and conviction records, as required by law.

We're excited to announce that Affirms is now a remote-first company! The majority of Affirms roles can be accomplished anywhere in the U.S. and Canada (with the exception of Quebec). While most Affirmsers will have the option to choose a remote-first accommodation, our offices in San Francisco, New York City, Pittsburgh, Chicago, and Salt Lake City will remain operational and accessible for anyone to use on a voluntary basis.

At Affirms, we're using today's technology to bring significant disruptive innovation to the financial industry. We focus on improving the lives of consumers by delivering simple, honest and transparent financial products.