System & Software Engineer - Edge ADN Service

HAProxy Technologies
HAProxy Technologies is the company behind HAProxy, the world’s fastest and most widely used software load balancer. Organizations rapidly deploy HAProxy products to deliver websites and applications with the utmost performance, observability and security at any scale and in any environment. HAProxy Technologies is headquartered in Newton, MA, with multiple offices across the US and Europe.

About the team and service
Are you ready to architect and build the global infrastructure that defends and optimizes the internets most critical websites?

We are seeking a

Software and Systems Engineer

to join the small, elite core team responsible for the Edge

Application Delivery Network (ADN)

service.

This is not an internal role; the Edge ADN service is an internet-facing, global reverse proxy that stands at the edge of the internet, operating on a massive scale from our dedicated, worldwide own data centers (no public cloud).

Our platform is responsible for the defense, logic, and optimization of customer websites, handling a current baseline of

1.5 million requests per second , with traffic surges (often from sophisticated DoS attacks) that are orders of magnitude larger.

We dont just manage traffic; we are actively mitigating attacks, manipulating requests, and optimizing user experience on a global stage. This role is for an engineer who thrives on working at the metal, designing systems that are both highly performant and impeccably reliable.

Why this role is unique
Scale and Impact : Design solutions that handle multi-million request-per-second traffic volumes and complex attack patterns, directly influencing global web performance and security.

Core Technology Focus : HAProxy is the heart of our service. You will work with and contribute to custom-compiled, mission-critical versions of

HAProxy Enterprise .

High-Quality, Low-Firefighting : We enforce an absolute intolerance for

technical debt . The platform is intentionally designed to be extremely hands-off. Your primary focus will be on greenfield development and architectural design, not routine bug fixes. When we deal with attacks, the outcome is always an automated, future-proof solution.

Global, Self-Directed Team : Join a globally distributed, remote-first team where you are empowered to

What you will be doing
As a member of our small core team, your work will be foundational, spanning architecture, development, and high-performance operations.

HAProxy-Centric Architecture : Design, implement, and optimize highly resilient, high-performance global network architectures, with a deep focus on

HAProxy configuration language

and its custom modules for traffic manipulation, defense, and routing.

System Development & Automation : Write high-quality, efficient code to automate the management, deployment, and scaling of the global ADN platform. This includes advanced scripting and development in:

Python, C

(for lower-level optimizations/integration), and advanced

shell scripting .

Attack Mitigation Design : Research, architect, and deploy new layers of defense against sophisticated web attacks (DoS, scraping, exploitation), with an emphasis on creating automated, self-healing, and self-managing mitigation systems.

Observability & Data Engineering : Work with our core data systems including

TimescaleDB, Postgres , and the

ELK stack

to enhance monitoring, performance analysis, and architectural insight for a service generating petabytes of data.

Future Platform Evolution : Drive the technical design and implementation for the shift from a white-glove model to a robust, fully featured self-service customer portal.

Tooling and Operations : Own and evolve our large-scale, declarative configuration management system, currently built on

Ansible , while planning its future transformation.

What were looking for
This role is for an

Intermediate to Expert-level

engineer who is fundamentally a systems architect and highly capable developer.

Essential Technical skills:
HAProxy : Hands-on experience configuring, optimizing, and troubleshooting HAProxy or comparable high-performance reverse proxies/load balancers.

Systems and Networking Mastery : Strong to expert knowledge of

Linux internals , distributed systems, and core internet protocols including

IP, TCP, DNS , and

BGP .

Programming Proficiency : Demonstrated ability to write production-quality, maintainable code in

Python, C , or advanced

shell scripting .

Database/Observability Experience : Familiarity with high-volume data platforms like

Postgres, TimescaleDB, Elasticsearch/Kibana

for monitoring and analysis.

Configuration Management : Experience with

Ansible

or other comparable configuration management/automation tools.

Essential non-technical skills:
Self-Motivated and Autonomous : Given the small, global nature of the team, you must be a self-starter who defines their own work, manages their time effectively, and takes full ownership of projects from conception to global deployment.

Unwavering Quality Standards : A demonstrated history of prioritizing quality, reliability, and architectural soundness over speed. A personal insistence on

minimal technical debt

is required.

Architectural Vision : The ability to look beyond the immediate problem and design scalable, resilient systems that anticipate future growth and use-cases.

Fluent in English : We work in an international context where English is used company-wide.

The position
This is a full-time, remote role for candidates located worldwide.

Wherever you are located, we put our employees and their families first by offering top of the line health and wellness coverage.

Growth
Being on the cutting edge of technology, employees have great opportunities to upskill and learn a vast array of technologies. Our goal is to promote your professional development and help you progress along one of our multiple career paths.

Thank you for your submission.
We appreciate yourinterest in HAProxy Technologies, and will contact you if theres a fit.

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