Senior Software Engineer, Backend (Identity International)

Affirm, Inc.; Polska; Remote; PLN 308,000 - 428,000; Full time

Benefits offered by this job

Competitive paid time off

Private healthcare

MultiSport card

Learning and development programs

Equity rewards and stock benefits

Employee resource groups

Job summary

Affirm, Inc. is seeking a Senior Software Engineer for the Identity team, focused on building robust backend systems in Python and Kotlin. You will shape quarterly technical direction, collaborate across product and analytics, and drive improvements in reliability, scale, and operability while mentori ng teammates.

The role is remote within Poland, offering a deep, hands-on coding focus and opportunities to influence global growth.

Qualifications

• 4+ years of experience designing, developing and launching backend systems at scale using Python or Kotlin.
• Track record of developing highly available distributed systems with AWS, MySQL and Kubernetes.
• Ability to define a technical plan for delivering a significant feature or system component with an elegant design.
• Ability to write high quality code that is easily understood and reused by others.
• Experience making large codebase changes safely with a suite of tools and practices.
• Proactive in seeking feedback and owning personal growth, with strong communication skills.

Responsibilities

• You will own and deliver quarterly goals for your team, guiding engineers through ambiguity to solve open-ended problems.
• You will collaborate with product management, design and analytics to articulate constraints and trade-offs.
• You will identify and lead efforts to resolve project, process or technology issues.
• You will support operations and availability by monitoring metrics and keeping services healthy.
• You will elevate code quality and design standards across the team and beyond through writing and talks.
• You will mentor teammates and contribute to hiring and onboarding.

Skills

Backend design

Distributed systems

Ownership & growth

Cross-team collaboration

Mentoring and coaching

Communication

Tools

AWS

MySQL

Kubernetes

Python

Kotlin

Job description

At **Affirm**, 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 affirm, 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 affirm’s international expansion. We are responsible for KYC, user lifecycle management, and identity decisioning across multiple regulatory environments. This work is about shaping how affirm 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 affirm’s 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.

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.

Total rewards

We believe the people building honest financial products at affirm should share in its success. That's why our total rewards are designed to support your health, growth, financial well-being, and future.

In service of our mission, we reward employees through a combination of base pay, equity (from parent company), and comprehensive benefits.

Base Pay Grade

- N

308,000 zł - 428,000 zł

Employees new to affirm typically come in at the start of the pay range. affirm 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 affirm holdings, inc. (parent company).

Base pay ranges and placement within those ranges are determined based on several factors, including role, experience, and job-related skills.

In addition to base pay, all employees in this role are eligible to receive equity from the parent company each year. This means as affirm’s parent company grows, employees have the opportunity to share in that growth financially.

Equity Grade - 4 (awarded in US Dollars)

Affirm Holdings, Inc. Equity Grade example

Equity grade: 4

New hire equity: $32,000-$48,000

Annual Refresh: $10,000

Reward equity: $0-$150,000

Affirm also provides flexible spending wallets to all employees for technology and wellbeing related needs, which are reimbursable up to 1390 zł per month.

Benefits

In addition to your compensation, our comprehensive benefits are designed to support you and the people who matter most. Benefits include:

• Competitive paid time off, paid public holidays, and additional paid Away Days to rest and recharge.
• Comprehensive private healthcare through Lux Med's Platinum package.
• A MultiSport card to support your health and well-being.
• Learning and development programs to help you grow professionally.
• Family healthcare support through Maven and parental leave support through Parentaly.
• Mental well-being support through Lyra, including up to 12 confidential counseling or coaching sessions each year for you and your household members.
• Financial well-being support through Northstar, with unlimited access to Certified.
• Financial Advisors and planning tools at no cost to you.
• Employee Resource Groups (ERGs) that foster connection and inclusion.
• Eligibility for creative tax benefits, subject to applicable law, role, and company policy.

Location - Remote Poland

The majority of our roles can be located anywhere in Poland.

• This job description is not a contractual document, and is not intended to have binding force.**

Remote-first with flexibility built in

Affirm 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 affirm 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

Our benefits reflect our commitment to care, transparency, and flexibility. Here are a few highlights:

• 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 affirm 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: affirm considers qualified applicants with arrest and conviction records, as required by law.