Circle is scaling quickly, and the foundation that supports their product needs to scale with it. They are looking for a Senior Back-End Software Engineer to take ownership of their Rails stack, keeping it modern, efficient, and built to last, while also shaping internal tooling, reducing third-party dependencies, and ensuring infrastructure readiness for future growth.
Requirements
- Deep expertise with Ruby on Rails*, with an emphasis on infrastructure and architectural improvements
- Solid experience working with MySQL and/or Postgres
- A strong track record of improving performance, scalability, and system reliability
- 5+ years of experience in a back-end engineering role, ideally focused on infrastructure or platform systems
- You’ve helped scale an early-stage product to 1M+ monthly active users.
- Experience with front-end technologies (especially React)
- You’ve built internal tooling or SDKs for use across engineering teams
Responsibilities
- Maintain and modernize our Rails stack, including dependency upgrades, performance optimization and security enhancement
- Build internal tools, SDKs, and libraries to improve developer experience and infrastructure scalability
- Partner with your front-end counter-parts and SREs to support observability, performance, and reliability initiatives
- Identify opportunities to build in-house systems that reduce reliance on costly third-party services
- Contribute to architectural decisions that improve the performance, security and cost-efficiency of our platform
Other
- Strong alignment with our values
- You are proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5
- Comfortable working autonomously in a fast-paced, fully remote environment
- Twice a year, we bring the whole company together in beautiful places around the world for our company offsites.
- We don't track hours, but we do manage for high expectations very closely.
