Senior Software Engineer, Fullstack

Affirm

. Own and deliver quarterly goals for the team .

Posted 11/12/2026full-timeRemote • SpainSenior💰 €86,000 - €122,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and developing scalable backend systems using Python, Kotlin, AWS, MySQL, and Kubernetes, while effectively collaborating with cross-functional teams. Proven ability to lead engineering teams through complex problem-solving and maintain high standards in code quality and technical documentation.

Highest-signal resume keywords

Backend System DevelopmentPython ProgrammingKotlin ProgrammingAWS Cloud ServicesCode Review Standards

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend System DesignWeb Application DevelopmentDeclarative UI FrameworksAI UtilizationCode Quality Assurance

Soft Skills

Effective CommunicationTeam LeadershipProactive Feedback-Seeking

Tools & Technologies

MySQLKubernetesReactVue

Industry Keywords

Direct-to-Consumer Financial ProductsInternational MarketsOn-Call Rotation

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 and support delivery
Collaborate with product management, design and analytics throughout the product development lifecycle
Participate in ideation, articulate technical constraints, and partner on risk and trade-off decisions
Identify and lead resolution of project, process, technology and business issues
Support operations and availability by creating and monitoring metrics, escalating when needed, and participating in keep-the-lights-on and on-call efforts
Set or improve code review and design standards and advocate for them through writing and tech talks
Develop team talent through feedback, guidance and leading by example
Build and operate Direct-to-Consumer financial products used by millions of consumers across international 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 deliver high quality products daily
Experience defining technical plans for significant features or system components with elegant, simple and extensible designs
High-quality, easily understood code
Proficiency making significant changes in a large code base safely
Strong ownership of professional growth and proactive feedback-seeking
Strong verbal and written communication skills for effective collaboration with a global engineering team
Must be based in Spain
On-call rotation is required

Benefits

Comp & perks

Monthly stipends for health, wellness and tech spending
100% subsidized medical coverage for employees and dependents
Dental and vision coverage for employees and 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
Flexible time off and generous holiday calendars
Employee stock purchase plan (ESPP) with discounted Affirm stock
Inclusive interview process and accommodations for candidates with disabilities