Senior Software Engineer (Comms Core)

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Senior Software Engineer (Comms Core) in Remote

Affirm
Full time
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Remote
10/20/2026
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Poland

Responsibilities

Own and deliver quarterly technical goals for the Communications area while solving ambiguous problems across messaging infrastructure.
Design and evolve reliable backend services for high-volume communications across multi-region, multi-tenant environments.
Design, implement, and operate resilient integrations with external messaging vendors.
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 through writing and technical talks.
Provide feedback, mentorship, and technical direction to teammates.

Requirements

5+ years of software development or engineering experience with deep system design and architecture knowledge.
Proficiency in modern programming languages such as Python or Kotlin.
Experience developing highly available distributed systems using technologies such as 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 define technical plans for significant features or system components and write high-quality, understandable, extensible code.
Proficiency making significant changes in large codebases and developing tools and practices to do so safely.
Proficiency with AI-assisted development tools and sound judgment when validating their outputs.
Strong ownership, growth mindset, verbal communication, and written communication skills.

Benefits

Remote-first role located anywhere in Poland, with occasional in-person work possible and an in-person onboarding experience for new hires.
Base pay is supplemented by equity, flexible spending wallets, health and wellness stipends, and comprehensive benefits.
100% subsidized medical coverage is provided for employees and dependents, including private healthcare through Lux Med's Platinum package.
Benefits include paid time off, paid public holidays, additional Away Days, a MultiSport card, learning and development programs, family healthcare and parental support, mental well-being counseling or coaching, and financial well-being resources.
Employees may participate in employee resource groups, an employee stock purchase plan, and creative tax benefits subject to applicable rules and policies.

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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