Site Reliability Engineer (Middle)

Claranet Portugal; Lisboa; On-site; EUR 60,000 - 90,000; Full time

Job summary

Claranet Portugal is seeking a Site Reliability Engineer (Middle) to drive reliability across services and enable product velocity through stability. You will build SLOs, improve observability, and contribute to disaster recovery and reliability engineering on production workloads in GCP and Azure.

You will design and document SLO frameworks, implement advanced monitoring and engage in incident response, architecture reviews, and mentoring of junior SREs.

Qualifications

• Hands-on experience operating production workloads on cloud platforms (GCP/Azure).
• Advanced Kubernetes operations, multi-cluster environments, service mesh and observability.
• Strong knowledge of distributed-systems reliability, including consensus and failure modes.
• Advanced monitoring with SLO-based alerting, anomaly detection and tracing.
• IaC experience with Terraform or Pulumi and reliability patterns.
• Load-testing/chaos engineering experience (k6, JMeter or similar).
• Database reliability: replication, failover, backup/restore strategies.
• Networking knowledge: load balancing, CDN, DDoS mitigation.
• Security operations: certificate management, secrets rotation and patching.
• Cloud architecture: multi-region, disaster recovery and high availability.

Responsibilities

• Design and document organisation-wide SLO frameworks and error budget policies.
• Architect observability for metrics, logs, traces and alerting.
• Drive reliability engineering practices including chaos engineering and load testing.
• Plan disaster recovery and deliver tested DR plans.
• Contribute to capacity planning and cost optimisation.
• Deliver automation projects and reliability workflows, including self-healing systems.
• Lead or support incident response and conduct reproducible investigations.
• Integrate AI-assisted diagnostic tools and validate outputs.
• Participate in architecture reviews with a reliability focus.
• Mentor Junior SREs in incident response and automation.
• Prepare quarterly reliability reviews for leadership.

Skills

Kubernetes operations

SLO-based alerting

Observability

Incident response

Disaster recovery

Cross-team collaboration

Technical writing

Mentoring

Tools

Terraform

Pulumi

k6 / JMeter

Job description

We're fast learners, hard workers, natural collaborators... and we Make Modern Happen!

Our ambition is to unlock the potential of our digital world so that organisations everywhere can innovate and thrive securely.

We aim to achieve this goal by bringing together the world’s most talented people and the most powerful technologies, combining them to address our customers' challenges and to build something stronger together.

Right now, we are looking for a Site Reliability Engineer (Middle) to drive reliability across multiple services and enable product velocity through stability. You will develop organisation-wide SLO and error budget practices, improve observability and automation, and contribute to disaster recovery and reliability engineering. Hands-on experience operating production workloads on GCP and Azure is required.

Your responsibilities include:

• Design and document organisation-wide SLO frameworks and error budget policies;
• Architect observability for metrics, logs, traces and alerting, including SLO-based alerting and anomaly detection;
• Drive reliability engineering practices, including chaos engineering and load testing;
• Plan disaster recovery and deliver at least two DR plans with tested procedures;
• Contribute to infrastructure capacity planning and cost optimisation;
• Deliver complex automation projects and reliability workflows, including self-healing systems;
• Lead or support incident response as an escalation point for complex incidents; conduct reproducible investigations using evidence across services;
• Integrate diagnostic and AI-assisted tools into repeatable investigation and preventive reliability workflows, validating their outputs and measuring their effectiveness;
• Participate in architecture reviews with a reliability focus;
• Mentor Junior SREs in incident response, automation and responsible use of diagnostic tools;
• Prepare quarterly reliability reviews for leadership.

You must have:

• Hands-on experience operating production workloads on GCP and Azure;
• Advanced Kubernetes operations experience, including multi-cluster environments, service mesh and observability;
• Knowledge of distributed-systems reliability, including consensus, replication and failure modes;
• Advanced monitoring experience, including SLO-based alerting, anomaly detection and tracing;
• Infrastructure as Code experience with Terraform or Pulumi, including reliability patterns;
• Load-testing and performance-engineering experience, including k6, JMeter or chaos engineering;
• Knowledge of database reliability, including replication, failover and backup/restore strategies;
• In-depth networking knowledge, including load balancing, CDN and DDoS mitigation;
• Security operations experience, including certificate management, secrets rotation and patching;
• Cloud architecture knowledge covering multi-region, disaster recovery and high availability;
• Experience designing diagnostic workflows, correlating evidence across services, evaluating AI-generated outputs, conducting reproducible investigations and integrating safe automation;
• Incident command and crisis management skills;
• Strong cross-team collaboration, technical writing, mentoring and knowledge-sharing skills;
• A data-driven approach and the ability to balance reliability with delivery velocity.