Senior Cloud Engineer

O3 Solutions; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

O3 Solutions seeks a Sr. Cloud Engineer to design, build, and operate our Azure‑based cloud infrastructure, with AWS/GCP exposure. You will drive architectural decisions, implement IaC pipelines, and lead CI/CD practices in an Agile environment.

You will manage identity, security, and cost, and mentor others while shaping the platform’s evolution across multi‑region deployments. Strong automation skills and collaboration with security teams are essential.

Qualifications

• Minimum of 5 years of cloud engineering experience with architectural input.
• Hands-on Azure expertise with PaaS and IaaS fundamentals.
• Expert in IaC using Terraform or OpenTofu with reusable modules.
• Strong CI/CD experience for infrastructure delivery (Bitbucket Pipelines, Jenkins, GitHub Actions, Azure DevOps).
• Experience scaling production workloads: autoscaling, load testing, capacity planning, and cost optimization.
• Knowledge of containerization and Kubernetes with migration capability.
• Identity and network fundamentals: Entra ID, DNS, VPNs, firewalls, network security.
• Proficiency in Python, PowerShell, Go, or C# for automation.

Responsibilities

• Design, implement, and operate scalable cloud infrastructure on Azure, with AWS/GCP as needed.
• Propose technical direction for cloud platform and carry it to execution.
• Build and maintain IaC pipelines using Terraform/OpenTofu with reusable modules.
• Create and optimize CI/CD pipelines to enable rapid, reliable delivery in Agile teams.
• Manage identity, access, and security controls including Entra ID and zero-trust concepts.
• Design platform on Azure PaaS and managed services; patching, backup, DR.
• Handle capacity planning, autoscaling, and multi-region design with cost awareness.
• Implement monitoring and logging (Azure Monitor, Prometheus/Grafana, SIEM) for reliability.
• Lead security reviews integrated into IaC and CI/CD; mentor engineers on best practices.

Skills

Cloud architecture

Mentoring

Cost optimization

Security & compliance

Automation

Clear communication

Education

Bachelor's degree in Computer Science / IT / Systems Engineering or related field

Tools

Terraform/OpenTofu

Bitbucket Pipelines

GitHub Actions

Azure DevOps

Jenkins

Kubernetes

Microsoft Entra ID

Azure

AWS

GCP

Job description

The Sr. Cloud Engineer shares responsibility for the design, build, and operation of O3’s cloud infrastructure. This is a hands‑on senior role for someone who brings ideas forward: you will propose how our environments should evolve, make the case for it, and build it alongside the team. O3 runs primarily on Microsoft Azure and has expanded into AWS and GCP. Day to day you will design and manage scalable, secure, and reliable cloud environments, take a leading hand in infrastructure‑as‑code and CI/CD, and serve as a senior escalation point for the team.

What you’ll do

• Design, implement, and operate scalable, secure, and reliable cloud infrastructure supporting O3’s applications and services, primarily on Microsoft Azure, as well as AWS and GCP.
• Contribute to the technical direction of O3’s cloud platform by bringing forward proposals for what should be built next along with the reasoning and trade‑offs, and carry them through once agreed.
• Build and maintain infrastructure‑as‑code (IaC) pipelines using Terraform or OpenTofu, contributing reusable modules that keep every environment version‑controlled and reproducible.
• Build and maintain continuous integration and continuous deployment (CI/CD) pipelines using Bitbucket Pipelines, GitHub Actions, Azure DevOps, or Jenkins to ensure rapid and reliable delivery within an Agile (Scrum) environment.
• Administer and optimise Microsoft Entra ID, conditional access policies, and hybrid identity configurations.
• Design and operate O3’s platform on Azure PaaS and managed services, including supporting Windows and Linux servers (patching, backup, and disaster recovery).
• Own capacity planning and scaling for O3’s platform: autoscaling, load testing, multi‑region design and cost at scale. Evaluate container orchestration options (including Kubernetes), make recommendations, and lead the migration of existing workloads onto Kubernetes if needed.
• Implement monitoring, logging and alerting solutions (PagerDuty, Azure Monitor, Prometheus/Grafana, SIEM) to ensure system reliability, performance and scalability. Continuously optimise infrastructure for cost and performance.
• Ensure all cloud infrastructure adheres to security best practices and O3’s compliance obligations, including SOC 2, ISO 27001, ISO 27701, GDPR and other relevant frameworks.
• Design and enforce zero‑trust architecture, network segmentation, MFA and least‑privilege access controls.
• Work closely with development, operations, security and product teams to align cloud infrastructure with O3’s strategic goals and project requirements.
• Partner with the Cloud Security Engineer so that security review is built into IaC and CI/CD rather than bolted on after deployment.
• Serve as a senior escalation point for the team, resolving complex networking, systems and application issues.
• Automate repetitive operational tasks through scripting (PowerShell, Python, Go or C#) to reduce toil and improve reliability.
• Maintain comprehensive technical documentation for all infrastructure, runbooks and standard operating procedures, including the reasoning behind architectural decisions.
• Participate in incident response, root‑cause analysis and post‑incident reviews.
• Mentor engineers and developers on effective CI/CD and IaC principles and participate actively in design review.
• Participate in the on‑call rotation and deployments to ensure O3’s services remain available for customers.
• Additional duties as necessary to support O3’s initiatives and goals.

Qualifications

• Minimum of 5 years of experience in cloud engineering or a related field, including experience contributing to architectural decisions, not only implementing them. Bachelor’s degree in Computer Science, Information Technology, Systems Engineering or a related field, or equivalent professional experience.
• Deep hands‑on experience with Microsoft Azure, with an emphasis on PaaS and managed services alongside IaaS fundamentals such as virtual networks and load balancers, and working knowledge of AWS or GCP.
• Expert command of infrastructure‑as‑code tools, specifically Terraform or OpenTofu, with experience designing reusable modules.
• Strong experience with CI/CD tools (e.g., Bitbucket Pipelines, Jenkins, GitHub Actions, Azure DevOps) for infrastructure and service delivery.
• Hands‑on experience scaling production cloud workloads: autoscaling, load testing, capacity planning and fixing performance bottlenecks under real growth.
• Working knowledge of containerisation and Kubernetes, with the ability to migrate existing workloads onto it if needed.
• Strong grasp of platform fundamentals: identity and access management in Microsoft Entra ID, DNS, certificate services, VPNs, firewalls, load balancers and network security.
• Proficiency in at least one programming or scripting language: Python, PowerShell, Go or .NET/C#.
• Proven ability to identify what needs to be built, make the case for it clearly to technical and non‑technical audiences and see it through from concept to completion with minimal guidance.

Additional Information

O3 Solutions provides a digital project management platform purpose‑built for capital projects. Driven by industry best practices, including Advanced Work Packaging (AWP), Agile and Lean methodologies, O3 helps teams of all kinds achieve measurable success from early phase planning through execution, systems completion and start‑up. At O3, we are committed to building a team of talented, passionate individuals who are dedicated to reshaping the future of the construction industry. Our people are the driving force behind everything we achieve and we’re always looking for exceptional talent to join us on our journey.