Senior Network Engineer

Hack The Box; Greater London; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

25 annual leave days

Paid parental leave

Home Office Allowance

Training & conferences budget

Equipment & lab access

Flexible hours

Job summary

Hack The Box seeks a Senior Network Engineer to own design, deployment, and reliability of our global data-center network. You’ll shape spine‑leaf architectures, manage eBGP/iBGP, and build scalable EVPN‑VXLAN fabrics across regions while modernizing automation with Ansible and Terraform.

The role offers flexible remote/hybrid work with relocation support and a strong focus on observability using Prometheus and Grafana. Remote-friendly with international scope.

Qualifications

• 5+ years of professional experience in data center networking.
• Deep hands-on BGP experience across multi-site environments.
• Proven EVPN‑VXLAN fabric design experience.
• Strong JunOS proficiency on Juniper devices (QFX/MX).
• Knowledge of spine-leaf/IP fabric architectures, VLANs and VRFs.
• Experience with network automation tools (Ansible, Terraform, Nornir).
• Linux networking fundamentals (iptables/nftables, VXLANs).
• Excellent written communication for remote collaboration.
• Cybersecurity-minded is a strong plus.

Responsibilities

• Design and operate spine-leaf architectures across multiple data centers.
• Manage BGP peering, route policies and prefix filtering in multi-site environments.
• Develop EVPN‑VXLAN fabrics for scalable connectivity.
• Configure, upgrade and harden Juniper equipment running JunOS.
• Develop network automation using Ansible, Terraform or similar tools.
• Improve monitoring and observability with Prometheus and Grafana.
• Collaborate with platform teams for VNware, Kubernetes and Ceph storage needs.
• Document designs, runbooks and SOPs for a global team.
• Participate in on-call rotation across regions.

Skills

BGP

EVPN‑VXLAN

JunOS

OSPF

Linux networking

Ansible

Terraform

Prometheus

Grafana

Network automation

Tools

Juniper QFX/MX (JunOS)

Nornir

Kubernetes networking (CNI)

Job description

Ready to embark on the quest of joining Hack The Box?

Welcome! Super excited you dropped by

At the end of this journey, you'll become a proud member of Hack The Box, with the ultimate mission to raise cyber resilience, so that every organization can stay ahead of tomorrow’s threats.

The Core Mission Of The Senior Network Engineer

As a Senior Network Engineer, you will own the design, deployment and day-to-day reliability of the network fabric that connects Hack The Box's data center footprint across the US, EU, Singapore and Australia. Your work directly underpins the platform experience for millions of users running live cyber simulations — low-latency, high-availability networking isn't a nice-to-have, it's the product.

Design and operate production-grade, multi-site network architectures using BGP, EVPN-VXLAN and JunOS, ensuring our data center interconnects are resilient, observable and ready to scale as HTB grows into new regions.

Location & Work Mode:

• Europe/Greece
• Choose between fully remote work across Europe or relocating to our Athens Tech Hub with relocation support.

Fully Remote / Hybrid (2 days in the office, 3 days remote, plus one month of work from anywhere) - If only in Greece: When hiring in Greece, we’re open to candidates from all locations. Those based within 55 km of our Athens office will follow a hybrid work model. For candidates located beyond that radius, a fully remote arrangement is available.

Relocation

• We offer a 10% relocation bonus on the annual salary to support your move.
• In addition, you would benefit from a 50% tax reduction on your income as part of the relocation.
• We'll support you with accommodation during the first few weeks

The fellowship you’ll be joining:

Tools & Weapons You’ll Be Using

BGP, EVPN-VXLAN, JunOS (Juniper QFX/MX), OSPF, Spine-Leaf / IP Fabric, VLANs, VRFs, Linux networking, Ansible, Terraform, Prometheus / Grafana, Observability tooling

The adventures that await you after becoming Senior Network Engineer at Hack The Box:

• Design and implement spine-leaf network architectures across multiple data center sites in the US, EU, Singapore and Australia
• Operate and troubleshoot BGP (eBGP/iBGP) peering, route policies and prefix filtering in a multi‑site environment
• Build and maintain EVPN‑VXLAN overlay fabrics for scalable Layer 2/Layer 3 connectivity across data centers
• Configure, upgrade and harden Juniper network equipment (QFX, MX series) running JunOS
• Develop and maintain network automation using Ansible, Terraform or similar infrastructure‑as‑code tooling
• Establish and improve network monitoring, alerting and observability (Prometheus, Grafana, SNMP, streaming telemetry)
• Plan and execute network capacity upgrades, site bring‑ups and hardware refresh cycles
• Collaborate with the platform/systems engineering team on network requirements for VMware, Kubernetes and Ceph storage clusters
• Document network designs, runbooks and standard operating procedures for a globally distributed team
• Participate in on‑call rotation for network‑related incidents across all regions

Skills, knowledge, and experience points required to unlock the role of Senior Network Engineer at Hack The Box:

• 5+ years of professional experience in network engineering, with a focus on data center networking
• Deep hands‑on experience with BGP (eBGP/iBGP), including route policies, communities and prefix management across multi‑site environments
• Proven experience designing and operating EVPN‑VXLAN fabrics
• Strong proficiency with JunOS and Juniper switching/routing platforms (QFX, MX series)
• Solid understanding of spine‑leaf / IP fabric architectures, VLANs, VRFs and inter‑VLAN routing
• Experience with network automation tools (Ansible, Terraform, Nornir or similar)
• Comfortable with Linux networking fundamentals (iptables/nftables, routing, bonding, VXLANs at the host level)
• Strong troubleshooting skills — ability to methodically diagnose complex, multi‑layer issues under pressure
• Excellent written communication for documenting designs and collaborating in a remote‑first environment
• Being cyber security-minded is a strong plus

Bonus Points

• Experience with network operations in a multi‑region, multi‑continent data center environment
• Familiarity with Ceph or other distributed storage systems from a network‑performance perspective (NVMEoF, RDMA, high‑throughput east‑west traffic)
• Exposure to Kubernetes networking (CNI plugins, service meshes, load balancers)
• JNCIA/JNCIS/JNCIP or equivalent networking certifications
• Understanding of Golang for building internal network tooling or automation
• Experience in a cybersecurity‑focused or platform‑as‑a‑service company

What your Hack The Box adventure will have in store:

• 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!

The gems you’ll be enjoying as Senior Network Engineer:

• 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 Network 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.

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!

About Htb

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.