Senior Infrastructure Engineer

As an Infrastructure Engineer, you will build, maintain and evolve the compute, storage and container platforms that power Hack The Box across data centers in the US, EU, Singapore and Australia. You’ll work at the intersection of bare-metal infrastructure, virtualization and cloud-native tooling - and play a key role in one of HTB’s most impactful infrastructure initiatives: the migration away from VMware toward an open-source virtualization and cloud platform.

Core mission: Operate and improve HTB’s virtualization and storage stack (VMware vSphere, Ceph, Kubernetes) while helping the team evaluate, plan and execute a migration to an open-source alternative, * Operate and maintain VMware vSphere clusters and NSX-based virtual networking across multiple data center sites

• Administer and tune Ceph storage clusters, including NVMEoF-backed pools and RBD volumes
• Deploy, upgrade and troubleshoot Kubernetes clusters running on bare-metal and virtualized infrastructure
• Contribute to the evaluation and proof-of-concept work for migrating from VMware to an open-source platform.
• Develop and maintain infrastructure-as-code (Ansible playbooks, Terraform modules) for repeatable, auditable deployments
• Monitor infrastructure health and performance using Prometheus, Grafana and alerting pipelines; respond to incidents
• Collaborate with the network engineering team on data center connectivity, VLAN/VRF provisioning and storage-network performance
• Support hardware lifecycle operations: racking, provisioning, firmware updates and decommissioning across regions
• Write and maintain technical documentation, runbooks and post-incident reviews
• Participate in on-call rotation for infrastructure-related incidents, * You’ll have the exhilarating opportunity to contribute to a product that is highly appreciated by users and the cybersecurity community at large.
• You’ll experience a highly supportive and caring environment, fostering growth, flexibility, and autonomy.
• You’ll embark on an exciting journey of continuous learning and problem-solving, levelling up as our organisation grows.
• Most importantly, you’ll have a blast at HTB because fun is an essential ingredient in our recipe for success! Just wait until you see our global meet-ups!

• 3-5 years of professional experience in infrastructure, systems or platform engineering
• Hands-on experience with VMware vSphere administration (cluster management, resource pools, vMotion, HA/DRS)
• Working knowledge of VMware NSX or similar software-defined networking
• Experience administering Ceph storage (or comparable distributed storage systems)
• Solid Kubernetes operations experience (deployment, upgrades, troubleshooting, cluster lifecycle)
• Strong Linux systems administration skills (Debian)
• Familiarity with infrastructure-as-code tools (Ansible, Terraform)
• Comfortable working with monitoring and observability stacks (Prometheus, Grafana)
• Good written communication skills for documentation and remote-first collaboration
• Being cyber security-minded is a strong plus

Bonus Points:

• Hands-on experience with OpenStack, CloudStack or similar
• Experience with Ceph NVMEoF transport or RDMA-based storage networking
• Understanding of Golang for writing internal automation or tooling
• Familiarity with BGP, EVPN-VXLAN or data center networking concepts
• Experience with bare-metal provisioning tools (Tinkerbell)
• Previous work in a multi-region data center environment

• 25 annual leave days
• Paid parental leave
• Home Office Allowance
• Dedicated budget for training and professional development, participation in conferences
• State-of-the-art equipment
• Full access to the Hack The Box lab offerings; so you can learn how to hack
• Flexibility in working hours

Our benefits package is designed to provide strong support to our team, but it may vary depending on location and type of employment (e.g., UK, US, Greece, Australia, or engagement through an Employer of Record or contract).

️ The Quest of Becoming Hack The Box’s Senior Infrastructure Engineer:

• Level 1: To complete level one’s objective, submit your application.
• Level 2: Meet the Talent Acquisition team. Level’s objective: highlight your past achievements, ambitions, and values.
• Level 3: Meet the hiring team. Level’s objective: have a technical conversation that aligns with day-to-day job-related tasks and responsibilities.
• Level 4: Level’s objective: connect with the hiring team and share with them your achievements.
• Level 5: Congratulations! Not many reach this level . Level’s objective: have a constructive, final conversation with senior leadership to explore the role and your future at HTB.
• Level 6: You’ve officially received an offer from HTB! To complete the last level and the Quest, all you need to do is accept the offer.
• Quest complete. Congratulations, you’re officially one of us Your next quest: complete the onboarding.

Hack Your Career, Today. Join us in this epic adventure of cybersecurity at Hack The Box!

At Hack The Box, we are on a quest to find the most exceptional and enthusiastic talent to join our team. Whether or not you consider yourself a gamer, we value what makes you unique and want to know more about you. This job post provides just a glimpse of the incredible gamified experience our business and consumer customers enjoy through our platforms. So, if you’re ready to embark on a journey of growth and adventure, we can’t wait to meet you!

Hack The Box is the leading cyber readiness platform for the agentic era, battle-testing and upskilling both humans and AI agents to enhance organizational cyber resilience. Trusted by the Fortune 500, government agencies, and MSSPs, the platform delivers threat-informed learning paths consisting of real-world scenarios in gamified labs and live-fire simulations that build and validate offensive and defensive cyber capabilities. With a loyal community of more than 4 million members and 800+ enterprise customers, Hack The Box empowers teams and intelligent systems alike to strengthen cyber defenses and reduce breach risk effectively.

Rapidly growing its international footprint and reach, Hack The Box is headquartered in the UK, with additional offices in the US, Australia, and Greece.

News & Resources:

• We’re incredibly proud to share that our headquarters in the UK, along with our entities in Greece and the US, have been certified as a Great Place to Work for 4 consecutive years (2023 - 2026).
• In addition, our Greek entity has been recognized among the Best Workplaces in Greece (4th, 2nd, 3rd, 1st) and Europe (7th, 10th, 73rd) during this period - a testament to our strong culture and commitment to creating an exceptional employee experience!

Take a sneak peek at how it is to be part of HTB. Get more insights about our HTB culture and employee experience by visiting the “about us” section of our site, our career site, and Glassdoor.

At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace. We believe that diversity enriches our performance, services, and the communities we serve. As such, we ensure that all job applications are considered solely based on merit, skills, and qualifications. We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. We are dedicated to providing a fair and respectful work environment that reflects our values.