Senior Site Reliability Engineer - Traffic Engineering | NordVPN

Nord Security; Poland; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Hybrid work

Private healthcare

Mental health support

Team events

Job summary

Nord Security is seeking a seasoned Network Engineer to scale and secure our globally distributed edge infrastructure. You will own HTTP traffic flow, troubleshoot end-to-end connectivity, and design systems for fast, reliable access worldwide.

Role requires strong timing and collaboration across protocol layers, DNS, routing, and observability, with hands-on experience in Docker and high-traffic environments.

Qualifications

• Expertise in load balancing and traffic shaping architectures and health checks.
• Strong experience configuring NGINX and/or HAProxy in high-traffic environments.
• Solid networking fundamentals, DNS, routing, firewalling and packet analysis.
• Fluency across OSI layers L3–L7, TLS handshake and termination.
• Proficient in Python for automation and tooling.
• Ability to troubleshoot production network and application issues at scale.
• Experience with observability, metrics and logging for traffic systems.
• Experience with Docker and advanced networking within containerized environments.

Responsibilities

• Ensure content accessibility across globally distributed edge infrastructure.
• Design, operate, and improve load balancing and traffic shaping systems at scale.
• Troubleshoot connection, latency, and accessibility issues end-to-end.
• Own HTTP traffic flow from client to edge to origin and back.
• Investigate and resolve website and service reachability problems.
• Work across protocol layers to diagnose issues at the right depth.

Skills

Load balancing

Traffic shaping

Networking fundamentals

OSi model fluency

Python programming

Troubleshooting

Observability

Docker

DNS/Routing/Firewalls

Tools

NGINX

HAProxy

SaltStack

Linux

Job description

The world’s most advanced VPN, and a whole lot more.

If you’re a curious problem-solver who carves their own path, join the team behind Threat Protection Pro, the NordLynx protocol, and the fastest VPN on the planet—tools that put privacy, security, and control back in people’s hands.

Your impact? Helping millions take back control of their online security, privacy, and data.

NordVPN serves millions of users through a global edge network. Your number one responsibility is content accessibility - making sure traffic reaches users reliably, quickly, and securely, everywhere in the world.

You’ll work at the intersection of networking, load balancing, and traffic shaping. When something is slow, unreachable, or misbehaving at the protocol level, you’re the person who finds out why and fixes it.

Main Responsibilities

• Ensure content accessibility across a globally distributed edge infrastructure

• Design, operate, and improve load balancing and traffic shaping systems at scale

• Troubleshoot connection, latency, and accessibility issues end to end

• Own HTTP traffic flow - from client to edge to origin and back

• Investigate and resolve website and service reachability problems

• Work across protocol layers to diagnose issues at the right depth

Core Requirements

• Load balancing and traffic shaping - architecture, algorithms, health checking, failover

• NGINX and/or HAProxy - configuration, tuning, debugging in high-traffic environments

• Networking fundamentals - DNS, routing, firewall, packet capture and analysis

• OSI model fluency - comfortable working across L3–L7, TCP internals, SSL/TLS handshake and termination

• SaltStack

• Linux administration

• Python programming - automation, tooling, scripting

• Troubleshooting network and application-layer issues in production at scale

• Observability knowledge - metrics, logging, and monitoring for traffic systems

• Docker knowledge - full lifecycle and dependency management with advanced networking

Bonus Points For

• Advanced networking - anycast, BGP, traffic engineering at the network layer

• Deep understanding of the HTTP protocol - HTTP/1.1, HTTP/2, HTTP/3, WebSocket, connection lifecycle

• Proxy protocols - PROXY protocol v1/v2, reverse proxy patterns, header propagation

What We Offer

Innovate with industry leaders

Work alongside global experts to build world-leading cybersecurity tools, impacting millions of users around the world.

Learn & grow

Boost your skills via our extensive training programs (online and offline) & other resources. Benefit from mentorship and career-switch opportunities to grow within the company.

Hybrid work

Enjoy the flexibility with 3 office days and working from home for the remaining 2.

Work from anywhere

Recharge with a change of scenery – choose work from any location when you feel a need to power your creativity and drive.

Physical well-being

Fuel your active lifestyle with online workouts led by our Physical Well-Being experts. Unlock a variety of sports and wellness facilities, like gyms, swimming pools, and fitness classes, with the Multisport card.

Mental & emotional health

Nurture your mind with free psychologist consultations, dedicated mental health events, and premium access to top-rated wellness apps like Calm, Headspace, and Mindletic.

Premium healthcare

Receive private health insurance giving you peace of mind for your health needs.

Joyful moments – special treats

Celebrate life’s big moments with special gifts from us on your birthday, anniversary, and other major events, such as weddings or the arrival of a new family member.

Company events & team-building

Experience iconic Nord Security celebrations, team-buildings, and knowledge-sharing events, nurturing bonds that fuel our success.

Workation

Embark on a legendary company getaway abroad, filled with exciting activities, live concerts, engaging workshops, and epic time together.

Kindly refer to our Privacy Notice for Recruitment Candidates for comprehensive information regarding our data handling procedures throughout recruitment processes.

We expect all candidates to provide accurate and complete information during the recruitment process. While limited use of AI tools to refine application materials is acceptable, candidates remain fully responsible for ensuring that their submissions reflect their own qualifications, skills, and experience. Any failure to do so may negatively affect participation in the recruitment process. If broader AI assistance is allowed for a particular role or stage, we’ll let you know in advance.

By submitting your application, you acknowledge that it may be processed using automated tools for evaluation purposes. As part of our recruitment process, we may use an AI-based application review tool to help assess applications based on skills and experience relevant to the role. This technology is used to support - not replace - human decision-making, and every application is ultimately reviewed by a recruiter.

If you would like more information about how AI is used in this process or wish to exercise your rights under applicable data privacy laws, please contact us at [e-mail]. Should you prefer to opt out of the automated evaluation, please submit your application directly to [e-mail].