Senior Software Engineer, Fullstack

Affirm

. Own and deliver quarterly goals for the team .

Posted 11/12/2026full-timeRemote • PolandSenior💰 PLN 308,000 - PLN 428,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in backend system design and development using Python, Kotlin, AWS, MySQL, and Kubernetes, while effectively leading teams through ambiguity and fostering collaboration across product management and design. Strong focus on code quality, engineering standards, and team talent development.

Highest-signal resume keywords

Backend System DevelopmentPython ProgrammingKubernetes ManagementTeam LeadershipCode Quality Assurance

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend System DesignPythonKotlinAWSMySQLKubernetesDeclarative UI FrameworksWeb Application DevelopmentCode Review StandardsTechnical Planning

Soft Skills

Verbal CommunicationWritten CommunicationTeam CollaborationFeedback SeekingProblem Solving

Industry Keywords

Product Development LifecycleMetrics MonitoringEngineering StandardsGlobal Engineering TeamDirect-to-Consumer Markets

Tech Stack

Tools & technologies

AWSKotlinKubernetesMySQLPythonReactVue.js

About the role

Key responsibilities & impact

Own and deliver quarterly goals for the team
Lead engineers through ambiguity to solve open-ended problems
Support team members throughout delivery
Collaborate with product management, design, and analytics throughout the product development lifecycle
Participate in ideation and articulate technical constraints
Partner on decisions considering risks and trade-offs
Identify and lead resolution of project, process, technology, and business issues
Support operations and availability of team artifacts
Create and monitor metrics, escalate when needed, and support keep-the-lights-on and on-call efforts
Set or improve code review and design standards
Advocate for engineering standards through writing and tech talks
Develop team talent through feedback, guidance, and leading by example
Build and operate products at scale for Affirm's international direct-to-consumer markets

Requirements

What you’ll need

4+ years of experience as a software engineer
Experience 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
Efficient use of AI to assist in delivering high quality products daily
Experience defining technical plans for significant features or system components with elegant, simple, and extensible designs
Ability to write high quality code that is easily understood and used by others
Proficiency making significant changes in a large code base safely
Suite of tools and practices enabling safe changes to large code bases
Ownership of professional growth and proactive feedback-seeking
Strong verbal and written communication skills for collaboration with a global engineering team

Benefits

Comp & perks

Equity from Affirm Holdings, Inc. (parent company)
Monthly stipends for health, wellness and tech spending
100% subsidized medical coverage, dental and vision for employees and dependents
Flexible spending wallets for technology and wellbeing needs, reimbursable up to 1390 zł per month
Competitive paid time off
Paid public holidays
Additional paid Away Days
Comprehensive private healthcare through Lux Med's Platinum package
MultiSport card
Learning and development programs
Family healthcare support through Maven
Parental leave support through Parentaly
Mental well-being support through Lyra, including up to 12 confidential counseling or coaching sessions each year for employees and household members
Financial well-being support through Northstar, with unlimited access to Certified Financial Advisors and planning tools at no cost
Employee Resource Groups (ERGs)
Eligibility for creative tax benefits, subject to applicable law, role, and company policy
Employee stock purchase plan (ESPP) allowing employees to buy Affirm stock at a discount
In-person onboarding experience
Inclusive interview process and accommodations for candidates with disabilities