IT2_ジュニアクラウドアーキテクト/Junior Cloud Architect

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Job Description / Roles & Responsibilities

Astroscale is seeking a Junior Cloud Architect who will be responsible for the operation and maintenance of our AWS cloud environment while progressively taking on cloud architecture and design responsibilities.

This is a development-oriented position intended for candidates who possess foundational AWS infrastructure knowledge and aspire to grow into a Cloud Architect role in the future.

After joining the company, you will begin by learning and supporting the existing AWS environment. While handling day-to-day infrastructure operations, you will participate in architecture design activities under the guidance of senior team members. You will also gradually expand your responsibilities in managing and operating Infrastructure as Code (IaC) using Terraform.

By deepening your technical expertise, architecture design capabilities, and business understanding, you will be expected to grow into a Cloud Architect role over time.

Key Responsibilities

AWS Infrastructure Operations

Understand, operate, and support the AWS environment.

Administer and maintain the following AWS services:

Amazon EC2

Amazon VPC

AWS IAM

Amazon S3

Security Groups

Amazon Route 53

VPN and connectivity infrastructure

Other related infrastructure services

Assist with AWS environment provisioning.

Configuration management.

Infrastructure monitoring.

Incident response and troubleshooting.

Patch management.

Backup and restore operations.

Day-to-day operational support and maintenance.

Documentation Management

Maintain and update documentation to improve visibility and operational efficiency of the AWS environment, including:

System architecture diagrams

Operational procedures (Runbooks)

Change logs

Asset inventory and configuration management records

Cloud Architecture Support

Collaborate with Cloud Architects and Senior Engineers to support the design of AWS architectures that deliver:

Security

High availability

Fault tolerance

High performance

Cost optimization

Additional responsibilities include:

Participating in architecture reviews

Contributing to technical planning activities

Conducting Proofs of Concept (PoCs)

Supporting cloud migration projects

Reviewing existing AWS environments and recommending improvements in:

Reliability

Security

Performance

Maintainability

Cost efficiency

Terraform & Infrastructure as Code (IaC)

Develop an understanding of the existing Terraform environment, including:

Module structure and management

State management

Variable management

Deployment workflows

Modify and improve Terraform code through a review-based development process.

Support infrastructure standardization and version control.

Gradually take ownership of Terraform environment maintenance and enhancement.

Participate in safe infrastructure change management processes, including:

Change planning

Peer reviews

Testing

Rollback planning

Documentation updates

Improve operational efficiency through automation and scripting.

Enhance operational processes using Git-based workflows.

Reliability, Security & Communication

Monitor cloud resources and infrastructure.

Investigate incidents and service disruptions.

Respond to operational incidents.

Perform Root Cause Analysis (RCA).

Implement preventive measures to avoid recurrence.

Apply AWS security best practices, including:

Least-privilege IAM design

Network segmentation

Encryption

Log management

Secure access controls

Collaborate with IT, Security, Application, and Business teams.

Document technical decisions and architecture rationale.

Escalate risks and issues proactively when necessary.

Required Qualifications

2+ years of hands-on experience in IT infrastructure, cloud operations, systems administration, DevOps, or related fields.

Practical experience and knowledge of key AWS services:

Amazon EC2

Amazon VPC

AWS IAM

Amazon S3

Security Groups

Amazon Route 53

Amazon CloudWatch

Foundational networking knowledge.

Basic understanding of cloud architecture principles:

Availability

Scalability

Resilience

Security

Cost optimization

Foundational experience with Infrastructure as Code (Terraform experience preferred).

Experience using Git.

Experience working in Pull Request / Merge Request-based development workflows.

Ability to investigate incidents and analyze logs.

Experience performing operational tasks according to Runbooks and documented procedures.

Strong documentation skills.

Self-motivated with a strong willingness to learn.

Experience maintaining architecture diagrams, SOPs, change records, and asset inventories.

Business-level proficiency in either Japanese or English.

Basic conversational ability in the other language, with a commitment to ongoing language development.

Ability to support occasional evening or weekend maintenance activities when required.

Preferred Qualifications

AWS Certifications such as:

AWS Certified Solutions Architect – Associate

AWS Certified Cloud Practitioner

Or currently working toward obtaining these certifications

Experience operating Terraform in a team environment, including:

Module management

Remote State management

Provider version control