Senior Backend Engineer

About Us

Paper Run automates direct-mail flows for leading DTC/e-commerce brands, enabling them to reach customers who don’t open emails, respond to retargeting ads, or engage via SMS. Our platform integrates with tools like Shopify and Klaviyo, offers A/B-testing and reporting dashboards, and delivers measurable incremental revenue.

We partner with some of the world’s best brands to turn “unreachable customers” into opportunities. You’ll join our Customer Success team to help these brands adopt, test and scale our direct-mail channel.

Role Overview

We’re looking for a Senior Full Stack (Backend) Engineer who thrives on building clean, scalable systems quickly. You’ll play a key role in shaping our backend architecture—from API design and data pipelines to job processing and observability.

Key Responsibilities

• Design and build robust backend systems

• Architect scalable infrastructure for job processing, analytics, and event tracking

• Build internal tooling for rate limiting, quotas, and authentication

• Design, develop, and maintain APIs and backend services

• Collaborate closely with product, design, and CX to deliver exceptional features

• Optimize for performance, security, and scalability

• Write clean, maintainable, efficient code

• Stay current with emerging technologies and apply them thoughtfully

Required Skills & Qualifications

• Languages: Python, TypeScript

• Infrastructure: AWS (ECS, SQS, Parameter Store), Docker, GitHub Actions

• Data: Postgres, Redis

• Monitoring: LogFire, Sentry

• CI/CD: GitHub Actions

About you

• 4+ years of experience building production-grade backend systems

• Skilled at writing clear, maintainable code with solid abstractions

• Confident designing databases, APIs, and infrastructure

• Experience with high-throughput systems or background job queues

• Strong sense of end-to-end ownership—code, infra, tests, monitoring

• are deeply about developer experience for your teammates

Nice to have

• Experience with rate limiting, authentication systems, or quota tracking

• Familiarity with analytics & attribution engineering (e.g., dbt, Snowflake, event tracking)

• Experience building WYSIWYG editors

• Knowledge of PDF generation, render jobs, and image editing.

• Experience with SSR frameworks (Next.js, Remix)

*This role is on-site 5 days a week if London based