Senior Site Reliability Engineer, InfraSec

MongoDB Inc.; Dublin; Hybrid; EUR 100,000 - 140,000; Full time

Job summary

MongoDB is seeking an experienced Site Reliability/Infrastructure Security Engineer based in Dublin for a hybrid working model. You will harden Linux hosts and container workloads, implement CSPM and identity controls, and automate security tooling across AWS, Azure, and GCP.

You’ll write code, manage IaC, and help ensure Atlas-scale security posture while collaborating with cross-functional teams. Ideal candidates bring 5+ years of SRE or cloud security experience, strong Go/Python/C/C++/Rust

Qualifications

• 5+ years in SRE, infrastructure engineering, or cloud security engineering.
• Strong coding skills in Go, Python, C, C++, or Rust.
• Proven ability to build and operate large-scale distributed cloud infrastructure.
• Hands-on with Terraform, CloudFormation, or Ansible for automation.
• Experience owning Linux, Kubernetes, and at least one major cloud (AWS/GCP/Azure).

Responsibilities

• Harden hosts and container workloads using Linux security and eBPF tooling.
• Secure containerized infrastructure across multi-clouds with RBAC and network policies.
• Develop automated CSPM, workload identity, vulnerability management, and access controls.
• Write production-grade code and manage IaC to deploy security controls.
• Build real-time security monitoring, logging, and Atlas-scale posture tracking.
• Lead end-to-end initiatives from threat modeling to production reliability.

Skills

SRE/InfraSec experience

Go

Python

C/C++/Rust

Kubernetes

Cloud platforms (AWS/GCP/Azure)

Tools

Terraform

CloudFormation

Ansible

Job description

Who We Are

At MongoDB, we are building the future of data platforms with MongoDB Atlas; our fully managed, multi-cloud database service. The Infrastructure Security (InfraSec) team sits within Site Reliability Engineering (SRE) in the CTO organization. We are an engineering team dedicated to building the security infrastructure, primitives, and reusable controls that protect MongoDB Atlas across AWS, Azure, and Google Cloud (GCP).

InfraSec operates on a preventative, enabling model: rather than acting as a manual approval gatekeeper or compliance auditor, we develop automated guardrails and platform capabilities. We integrate security directly into the platform runtime, CI/CD, and Infrastructure-as-Code (IaC) workflows so engineering teams can operate securely at scale without friction.

We are looking to speak to candidates who are based in Dublin for our hybrid working model.

What You’ll Do

• Harden hosts and containerized workloads using Linux security mechanisms (AppArmor, SELinux, seccomp, cgroups) and eBPF-based tooling (Cilium, Tetragon)
• Secure containerized infrastructure across multi-cloud environments via RBAC, network policies, admission controls (Gatekeeper), and runtime threat detection.
• Build and manage automated services for Cloud Security Posture Management (CSPM), workload identity, vulnerability management, and access controls across AWS, Azure, and GCP
• Write production-quality code and leverage Infrastructure-as-Code (Terraform) to version, test, and deploy security controls as code
• Build real-time security monitoring, logging, and alerting systems to detect anomalies and track security posture at Atlas scale
• Lead initiatives across their full lifecycle; from threat modeling and architectural design to implementation, rollout, and long-term production reliability

What We’re Looking For

Minimum Qualifications

• 5+ years in SRE, Infrastructure Engineering, or Cloud Security Engineering
• Strong coding skills in Go (Golang), Python, C, C++, or Rust.
• Proven track record of building and operating large-scale distributed systems or cloud platform infrastructure.
• Hands-on experience using Terraform, CloudFormation, or Ansible for automated infrastructure provisioning.
• Demonstrated experience owning infrastructure in Linux, Kubernetes, and at least one major cloud provider (AWS, GCP, or Azure)

Preferred Qualifications

• Practical experience with eBPF-based security tooling (Cilium, Falco, Tetragon)
• Direct ownership of Cloud Security and Workload Identity platforms
• Multi-cloud expertise spanning AWS, Azure, and GCP
• Production exposure to low-level Linux security mechanisms (seccomp, AppArmor, SELinux, cgroups)

About MongoDB

MongoDB is built for change, empowering our customers and our people to innovate at the speed of the market. We have redefined the database for the AI era, enabling innovators to create, transform, and disrupt industries with software. MongoDB’s unified database platform - the most widely available, globally distributed database on the market - helps organizations modernize legacy workloads, embrace innovation, and unleash AI. Our cloud-native platform, MongoDB Atlas, is the only globally distributed, multi-cloud database and is available across AWS, Google Cloud, and Microsoft Azure. With offices worldwide and nearly 60,000 customers—including 75% of the Fortune 100 and AI-native startups—relying on MongoDB for their most important applications, we’re powering the next era of software. Our compass at MongoDB is our Leadership Commitment, guiding how and why we make decisions, show up for each other, and win. It’s what makes us MongoDB. To drive the personal growth and business impact of our employees, we’re committed to developing a supportive and enriching culture for everyone. From employee affinity groups, to fertility assistance and a generous parental leave policy, we value our employees’ wellbeing and want to support them along every step of their professional and personal journeys. Learn more about what it’s like to work at MongoDB, and help us make an impact on the world!

MongoDB is committed to providing any necessary accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter.

MongoDB is an equal opportunities employer.