Site Reliability Engineer (SRE) Cover Letter Examples & Writing Guide

Dear Hiring Manager, I am writing to express my strong interest in the Senior Site Reliability Engineer position at Google. With 7 years of experience building and operating large-scale distributed systems and deep expertise in cloud infrastructure, I am excited to contribute to the company that pioneered the SRE discipline. In my current role as Lead SRE at Uber, I have successfully: • Maintained 99.99% uptime for services handling 10M+ requests per second across global infrastructure • Built automated incident response systems reducing MTTR from 45 minutes to 8 minutes • Implemented comprehensive observability using Prometheus, Grafana, and distributed tracing • Designed chaos engineering experiments improving system resilience and fault tolerance • Led on-call rotation for critical services and developed runbooks for incident management • Reduced infrastructure costs by 40% through rightsizing and auto-scaling optimizations Google's SRE principles and commitment to reliability engineering excellence deeply inspire me. I am particularly excited about contributing to Google's infrastructure innovation and working on problems at unprecedented scale. I would welcome the opportunity to discuss how my SRE expertise can contribute to Google's mission of organizing the world's information. Sincerely, Alex Chen

Dear Hiring Team, I am excited to apply for the Site Reliability Engineer position on Netflix's Streaming Platform team. With 6 years of experience operating cloud-native systems at scale and expertise in AWS infrastructure, I am eager to help deliver exceptional streaming experiences to 200M+ subscribers worldwide. At Spotify, I have built reliable infrastructure including: • Managed Kubernetes clusters running 5,000+ microservices on AWS EKS • Implemented infrastructure-as-code using Terraform managing 10,000+ cloud resources • Built CI/CD pipelines with automated testing, canary deployments, and rollback capabilities • Designed auto-scaling policies handling 10x traffic spikes during peak hours • Implemented Service Level Objectives (SLOs) and error budgets for 50+ critical services • Reduced deployment failures by 75% through improved testing and gradual rollouts Netflix's culture of freedom and responsibility and focus on customer experience through reliability aligns perfectly with my engineering philosophy. I am particularly excited about working on global content delivery infrastructure. I look forward to discussing how my SRE skills can help Netflix deliver joy to millions of viewers. Best regards, Jordan Martinez

Dear Hiring Manager, I am thrilled to apply for the Site Reliability Engineer position on the AWS EC2 team. With 8 years of experience operating cloud infrastructure and deep understanding of virtualization technologies, I am excited to help operate the world's most comprehensive cloud platform. In my role as Senior SRE at Microsoft Azure, I have: • Operated compute infrastructure serving millions of virtual machines across 60+ global regions • Built automated capacity planning systems ensuring resource availability during demand surges • Implemented proactive monitoring detecting and mitigating issues before customer impact • Designed fault-tolerant architectures with multi-region failover and disaster recovery • Reduced incident volume by 50% through automation and self-healing systems • Collaborated with software engineering teams to improve service reliability and performance AWS's customer obsession and leadership in cloud computing inspire me. I am particularly excited about working on EC2's massive scale and contributing to innovations in cloud computing infrastructure. I would welcome the opportunity to discuss how my cloud infrastructure expertise can contribute to AWS's mission. Sincerely, Sarah Williams

Dear Hiring Team, I am writing to apply for the Site Reliability Engineer position on Meta's Infrastructure team. With 6 years of experience building scalable systems and expertise in Linux, networking, and distributed systems, I am eager to help power Facebook, Instagram, and WhatsApp. At Twitter, I have delivered SRE solutions including: • Operated distributed storage systems handling 500PB+ of data with 99.95% availability • Built automated deployment systems enabling 100+ production deployments per day • Implemented load balancing and traffic management for global user base of 200M+ users • Designed database sharding strategies supporting horizontal scalability • Created custom monitoring solutions for application and infrastructure metrics • Reduced on-call burden by 60% through automation and improved system reliability Meta's mission to bring the world closer together and investment in cutting-edge infrastructure deeply inspire me. I am particularly excited about working on systems at unprecedented scale and complexity. I look forward to discussing how my SRE expertise can contribute to Meta's infrastructure excellence. Best regards, Kevin Park

Dear Hiring Manager, I am excited to apply for the Site Reliability Engineer position on Stripe's Payments Platform team. With 5 years of experience building highly reliable financial systems and expertise in Kubernetes and cloud platforms, I am eager to help millions of businesses accept payments online. At Square, I have built payment infrastructure including: • Maintained 99.99% uptime for payment processing systems handling $50B+ in annual volume • Implemented PCI DSS compliance controls and security best practices for payment data • Built real-time monitoring and alerting systems for payment transaction flows • Designed circuit breakers and retry logic ensuring graceful degradation during failures • Automated incident response reducing detection-to-resolution time by 70% • Performed capacity planning for Black Friday and peak shopping events Stripe's mission to increase the GDP of the internet and focus on developer experience resonate deeply with me. I am particularly excited about working on global payment infrastructure and ensuring reliability at scale. I would love to discuss how my payments SRE expertise can contribute to Stripe's growth. Sincerely, Lisa Thompson

Dear Hiring Team, I am writing to express my interest in the Site Reliability Engineer position on Airbnb's Cloud Infrastructure team. With 6 years of experience with AWS and Kubernetes, I am excited to help build reliable systems supporting millions of hosts and guests worldwide. At Lyft, I have delivered cloud infrastructure including: • Migrated monolithic applications to microservices architecture on Kubernetes reducing deployment time by 80% • Built GitOps workflows using ArgoCD and Flux for declarative infrastructure management • Implemented service mesh (Istio) for traffic management, security, and observability • Designed multi-region disaster recovery with RPO < 1 hour and RTO < 30 minutes • Built cost optimization strategies reducing cloud spend by 35% while improving performance • Created SRE culture and on-call practices including blameless postmortems Airbnb's mission to create a world where anyone can belong anywhere and commitment to reliability inspires me. I am particularly excited about working on global marketplace infrastructure. I look forward to discussing how my cloud SRE expertise can support Airbnb's platform. Best regards, Michael Rodriguez

Dear Hiring Manager, I am excited to apply for the Entry-Level Site Reliability Engineer position at Datadog. As a recent graduate with a B.S. in Computer Science from MIT and internship experience in DevOps engineering, I am eager to start my SRE career at a leader in monitoring and observability. During my internship at MongoDB and personal projects, I have: • Built automated infrastructure provisioning using Terraform and Ansible • Implemented CI/CD pipelines using Jenkins and GitHub Actions for containerized applications • Deployed applications to Kubernetes clusters on GKE with monitoring and logging • Created monitoring dashboards using Prometheus and Grafana tracking service health • Wrote Python scripts for infrastructure automation and incident response • Participated in on-call rotation and performed root cause analysis for production issues My academic coursework included distributed systems, operating systems, computer networks, and cloud computing. I am passionate about building reliable, scalable systems and learning SRE best practices. Datadog's mission to help organizations monitor and secure their infrastructure at scale inspires me. I am particularly excited about learning from experienced SREs and contributing to Datadog's platform reliability. I would welcome the opportunity to discuss how my technical skills and enthusiasm can contribute to Datadog's SRE team. Sincerely, Emma Johnson