Senior Site Reliability Engineer

Circle; Philadelphia (Philadelphia County); On-site; USD 120,000 - 163,000; Full time

Job summary

A financial technology company is looking for a Senior Site Reliability Engineer to manage and optimize cloud infrastructure on a global scale. The role requires expertise in automation, performance optimization, and team collaboration, providing opportunities to mentor junior staff and work with cutting-edge technologies.

Qualifications

• 4+ years in DevOps or SRE roles.
• Proficiency in Go, Python, and GitHub Copilot.
• Experience with Kubernetes clusters at scale.

Responsibilities

• Manage and maintain production infrastructure.
• Design and secure cloud infrastructure.
• Ensure system reliability with on-call rotations.

Skills

Observability

Troubleshooting

Performance Optimization

Automation

Collaboration

Tools

Terraform

Kubernetes

Go

Python

Cloud Platforms

Job description

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Circle is a financial technology company at the epicenter of the emerging internet of money, where value can finally travel like other digital data — globally, nearly instantly and less expensively than legacy settlement systems. This ground-breaking new internet layer opens up previously unimaginable possibilities for payments, commerce and markets that can help raise global economic prosperity and enhance inclusion. Our infrastructure – including USDC, a blockchain-based dollar – helps businesses, institutions and developers harness these breakthroughs and capitalize on this major turning point in the evolution of money and technology.

What You’ll Be Part Of

Circle is committed to visibility and stability in everything we do. As we grow as an organization, we're expanding into some of the world's strongest jurisdictions. Speed and efficiency are motivators for our success and our employees live by our company values: High Integrity, Future Forward, Multistakeholder, Mindful, and Driven by Excellence. We have built a flexible and diverse work environment where new ideas are encouraged and everyone is a stakeholder.

What You’ll Be Responsible For

As a Site Reliability Engineer at Circle, you’ll harness AI-powered insights to build and maintain our production infrastructure estate, enabling us to serve a rapidly expanding global customer base across multiple public cloud regions. You’ll apply your experience, technical expertise, and AI-enabled solutions to keep Circle’s products and core systems running consistently, reliably, and with top-tier performance. In a fun, collaborative, and ever-evolving environment, you’ll have ample opportunities to develop new skills, partner with diverse and cross-function teams across the organization, and stay on the cutting edge of technology.

What You'll Work On

• Empower agile development teams with a high-performance CI/CD pipeline, ensuring fast, high-quality releases with measurable performance and quality metrics.
• Design, maintain, and secure cloud infrastructure using Infrastructure-as-Code tools like Terraform and Crossplane.
• Automate operational tasks using Go, Python, and serverless solutions (AWS Lambda, Kubernetes Jobs).
• Manage and monitor Kubernetes clusters for multiple production workloads.
• Develop and maintain blockchain infrastructure, managing nodes across Ethereum, Solana, Arbitrum, Base, Avalanche, and others.
• Ensure system reliability and security by participating in on-call rotations, troubleshooting disruptions, conducting root cause analysis, and collaborating with Security teams on security-focused tools and frameworks.
• Plan, test, and implement disaster recovery strategies for a highly available microservices architecture.
• Leverage AI-powered solutions for managing infrastructure, analyzing logs, detecting anomalies, capacity planning, maintaining predictively, and optimizing performance.
• Mentor and support team growth, fostering collaboration and scalability.
  
  

Here Is Our Team Hierarchy For Individual Contributors

• Site Reliability Engineer (II)
• Senior Site Reliability Engineer (III)
  
  

What You’ll Bring To Circle (not All Required)

Site Reliability Engineer (II)

• 2+ years in DevOps or SRE roles, with a focus on tooling, automation, and infrastructure on a public cloud provider (AWS, Azure, GCP)
• 1+ years in CI/CD platform development and microservices support
• Proficiency in Go, Python, and Shell
• Eagerness to learn emerging AI tools
• Excellent communication skills—able to break down technical concepts and foster collaboration
• Observability, troubleshooting, and performance optimization skills in complex, distributed systems
• Experience with:
• Kubernetes clusters at scale, containerization, and Helm charts.
• Modern CI/CD platforms with seemingly complex gates and workflows
• Distributed blockchain systems and blockchain full nodes
• Networking (routing, DNS, load balancing, edge networking)
• APM, RUM, monitoring, and telemetry tools.
• Database technologies (PostgreSQL, Redis, OpenSearch)
• Migrating and transforming large, complex datasets from diverse sources, structures, and formats
• Data warehousing (Apache Airflow, AWS DMS, Snowflake)
• IaC with Terraform or Crossplane for cloud deployments
• AI tools (GitHub Copilot, Gemini, and ChatGPT) for productivity and code quality
• Large Language Models (LLMs) and AI applications in software development and operations,
  

Senior Site Reliability Engineer (III)

All The Requirements Of Site Reliability Engineer (II), And

• 4+ years in DevOps or SRE roles
• 3+ years in CI/CD platform development and microservices support
• Strong observability, problem-solving, and performance optimization skills in complex, distributed systems
• Hands-on experience with Blue-Green, Canary, and A/B Testing deployment strategies for services and databases
  
  

Circle is on a mission to create an inclusive financial future, with transparency at our core. We consider a wide variety of elements when crafting our compensation ranges and total compensation packages.

Starting pay is determined by various factors, including but not limited to: relevant experience, skill set, qualifications, and other business and organizational needs. Please note that compensation ranges may differ for candidates in other locations.

Base Salary Range

• Site Reliability Engineer (II): $120,000 - $162,500
• Senior Site Reliability Engineer (III): $147,500 - $195,000
  
  

We are an equal opportunity employer and value diversity at Circle. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. Additionally, Circle participates in the E-Verify Program in certain locations, as required by law.

Should you require accommodations or assistance in our interview process because of a disability, please reach out to [e-mail] for support. We respect your privacy and will connect with you separately from our interview process to accommodate your needs.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

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