Senior Fullstack Engineer, Repayments UX (Remote Europe)

Affirm, Inc.; Comunidad de Madrid; Remote; EUR 86,000 - 122,000; Full time

Benefits offered by this job

Health coverage for employees and pre/

Equity rewards

Flexible Spending Wallets

Away Days

Learning & Development

Parental benefits

Employee Resource & Community Groups

Job summary

Affinist, a remote-first company operating across Europe, seeks a Senior Full-Stack Software Engineer for the Repayments UX team. You will own quarterly goals, guide engineers, and drive scalable features across web and mobile platforms.

The role requires 4+ years of experience with React Native and web frameworks, plus backend skills in Python or Kotlin. We offer equity, health coverage, stipends, and visa sponsorship for Spain-based hires.

Qualifications

• 4+ years of experience developing and architecting mobile apps (preferably with React Native).
• Experience shipping web apps using React or Vue.
• Proficient in Python or Kotlin for backend work.
• Strong verbal and written communication skills for global collaboration.

Responsibilities

• Own and deliver quarterly goals for the team and guide engineers through ambiguity.
• Collaborate with product, design and analytics across the full product lifecycle.
• Proactively identify and solve project, process, or technology issues.
• Monitor metrics and support on-call duties to keep systems reliable.

Skills

React Native

React or Vue

Python or Kotlin

Strong communication

Ownership mindset

Job description

Affinist, a remote-first company operating across Europe, seeks a Senior Full-Stack Software Engineer for the Repayments UX team. You will own quarterly goals, guide engineers, and drive scalable features across web and mobile platforms.

The role requires 4+ years of experience with React Native and web frameworks, plus backend skills in Python or Kotlin. We offer equity, health coverage, stipends, and visa sponsorship for Spain-based hires.