Senior Software Engineer (Comms Core)

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Senior Software Engineer (Comms Core) in Remote

Affirm
Full time
Email

Remote
10/20/2026
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Spain

Responsibilities

Own and deliver quarterly technical goals for the Communications area.
Design and evolve reliable backend services for high-volume, multi-region, multi-tenant communications.
Build and operate resilient integrations with external messaging vendors.
Identify and resolve scalability, developer experience, technology, process, and operational-resilience issues.
Define service-level objectives and metrics, improve alerting and incident response, and participate in the required on-call rotation.
Improve design, testing, code review, rollout, and operational standards.
Provide mentorship, feedback, and technical direction to teammates.

Requirements

5+ years of software development or engineering experience with deep system design and architecture knowledge.
Proficiency in Python, Kotlin, or similar modern programming languages.
Experience developing highly available distributed systems using AWS, MySQL, DynamoDB, and Kubernetes.
Experience designing multi-region, multi-tenant platforms with strong isolation, scalability, failure recovery, and data-consistency guarantees.
Experience integrating third-party communications or messaging vendors and designing abstractions for differing capabilities, rate limits, and failure modes.
Ability to plan and deliver significant features or system components with simple, extensible designs and high-quality code.
Experience making significant changes in large codebases using tools and practices that support safe delivery.
Proficiency with AI-assisted development tools and sound judgment in validating their outputs.
Strong ownership, growth mindset, verbal communication, and written communication skills.

Benefits

Remote-first role based in Spain, with occasional in-person work potentially required and an in-person onboarding experience for new hires.
Visa sponsorship is available for this role, provided the employee is based in Spain.
€86,000–€122,000 annual base pay range.
100% subsidized medical, dental, and vision coverage for employees and dependents.
Monthly spending stipends for technology, food, lifestyle, health, and wellness needs.
Flexible time off, generous holiday calendars, and Away Days.
Learning and Development programs, parental benefits, and Employee Resource & Community Groups.
Employee stock purchase plan and potential equity rewards.

Affirm

Affirm offers a straightforward approach to credit by allowing consumers to buy now and pay later, all while eliminating hidden fees and compounding interest. This commitment to transparency and flexibility sets Affirm apart in the financial services landscape, making credit more accessible and c...

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