Site Reliability Engineer

Reachext — Japan · Posted ~8 hours ago

Senior

Skills

AWS Terraform Infrastructure as Code CI/CD Infrastructure operations Performance optimization Monitoring and alerting Security SLO and error budgets DevOps Observability Python Application engineering PHP GitHub Cursor Claude Code GuardDuty

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Summary ✨ AI‑Generated

An SRE opportunity within a rapidly growing technology environment, reporting closely to senior technical leadership. You will design and improve AWS infrastructure, optimize costs and performance, strengthen security, establish SLO practices, improve observability and CI/CD, and manage infrastructure through Terraform. AI-assisted engineering is encouraged to automate operations and increase efficiency.

Highlights

High-impact SRE role with direct influence on infrastructure strategy, reliability, security, cost optimization, and DevOps practices. The position offers substantial ownership in building infrastructure foundations from the ground up and close involvement in technical decision-making.

Description

ポジション概要 急成長中のITサービス企業にて、SRE(Site Reliability Engineer)を募集しています。 現在は専任インフラエンジニア1名とバックエンドエンジニアが協力しながらインフラ運用を行っていますが、事業拡大に伴い、システムの信頼性向上、セキュリティ強化、コスト最適化、DevOps推進が重要なテーマとなっています。 CTO直下のポジションとして、インフラ基盤の設計・改善をリードしながら、事業成長を支える高信頼なシステム構築を推進していただきます。 業務内容 AWS環境におけるインフラ運用・保守インフラコストの最適化システムパフォーマンスの改善・チューニング監視・アラート設計の最適化セキュリティ対策の強化(GuardDuty等)SLO/エラーバジェットの設計・運用DevOps・オブザーバビリティ文化の推進Infrastructure as Code(Terraform)による環境構築・管理CI/CDパイプラインの改善AIツールを活用した運用自動化・効率化推進技術環境 Infrastructure AWSLanguages TerraformPythonPHPTools GitHubCursorClaude CodeSlackNotion このポジションの魅力 0→1のインフラ基盤づくり インフラ組織はまだ拡大フェーズにあり、AWSマルチアカウント設計、セキュリティ強化、SLO運用、負荷試験など、未整備領域の設計から携わることができます。 経営に近い環境 CTO直下のポジションとして、技術的意思決定に主体的に関わることができます。 AI Nativeな開発文化 Cursor、Claude CodeなどのAI Coding Agentを積極活用しており、Terraformコード生成やレビュー、自動化推進などAIを前提とした開発スタイルを実践しています。 必須要件 AWSインフラエンジニアとして3年以上の実務経験Terraform等のIaCを利用したインフラ構築経験CI/CDパイプラインの設計・構築経験アプリケーションエンジニアとして1年以上の経験日本語ビジネスレベル以上(外国籍の場合N1レベル相当)歓迎要件 3~5名規模のチームリーダー経験Datadog等のオブザーバビリティツール導入・運用経験AWSマルチアカウント設計・運用経験SLO/エラーバジェットの設計・運用経験負荷試験およびパフォーマンスチューニング経験AI Coding Agent(Claude Code等)の活用経験求める人物像 新しい技術への探究心が高い方未解決の課題を自ら発見し、改善に取り組める方チームワークを重視し、オープンなコミュニケーションができる方変化の速い環境を前向きに楽しめる方給与 経験とすきるによる Site Reliability Engineer (SRE) Position Summary Our client is seeking an experienced Site Reliability Engineer (SRE) to help build and scale a highly reliable cloud infrastructure environment. As the business continues to grow, infrastructure reliability, cost optimization, security, DevOps practices, and observability have become increasingly important. Reporting directly to the CTO, this role offers the opportunity to drive infrastructure strategy and lead critical technical initiatives. Key Responsibilities Operate and maintain AWS-based infrastructureOptimize infrastructure cost and resource utilizationImprove application and platform performanceDesign and enhance monitoring and alerting systemsStrengthen security controls and incident prevention measuresDesign and manage SLOs and error budgetsPromote DevOps and observability best practices across engineering teamsManage infrastructure using Terraform and Infrastructure as Code (IaC)Build and improve CI/CD pipelinesDrive automation initiatives leveraging AI-powered development toolsTechnical Environment Infrastructure AWSLanguages TerraformPythonPHPTools GitHubCursorClaude CodeSlackNotionWhy Join? Opportunity to Build from the Ground Up You will play a key role in designing and improving infrastructure foundations, including multi-account AWS architecture, proactive security measures, SLO management, performance testing, and reliability engineering initiatives. Strategic Impact This position reports directly to the CTO, providing significant influence over infrastructure decisions and engineering strategy. AI-Native Engineering Culture The company actively embraces AI-powered development practices using tools such as Cursor and Claude Code, enabling engineers to focus on architecture, decision-making, and high-impact problem solving while automating routine tasks. Required Qualifications 3+ years of experience as an AWS Infrastructure Engineer or SREHands-on experience building infrastructure using IaC tools such as TerraformExperience designing and implementing CI/CD pipelines1+ year of software/application development experienceBusiness-level Japanese proficiency (JLPT N1 or equivalent for non-native speakers)Preferred Qualifications Team leadership experience (3-5 engineers)Experience implementing and operating observability platforms such as DatadogAWS multi-account architecture and governance experienceExperience defining and managing SLOs and error budgetsExperience with load testing and performance optimizationExperience leveraging AI coding agents such as Claude CodeIdeal Candidate Passionate about emerging technologies and continuous improvementProactive in identifying and solving complex technical challengesStrong team player with excellent communication skillsAdaptable and comfortable working in a fast-changing environmentSalary Based on Experiences and skills