Senior/Staff Python Engineer - CloudLinuxOS Optimization & Web Performance (Remote)

Senior/Staff Python Engineer (Remote) - Linux Infrastructure & Web Optimization

CloudLinux is a global, remote-first company dedicated to delivering high-volume, low-cost Linux infrastructure and security products that significantly increase operational efficiency. Our core principles emphasize doing the right thing and prioritizing our employees.

Our flagship product, CloudLinuxOS, powers over 80,000 production servers and 50 million websites, recognized for superior security and efficiency in shared hosting environments. CloudLinuxOS reduces operating costs and increases profitability by enhancing server density and security. Learn more: https://www.cloudlinux.com/

We are seeking a talented Senior/Staff Python Developer to join our engineering team. This role involves providing technical leadership while optimizing both web infrastructure and core CloudLinux features related to resource limitation (LVE - Lightweight Virtual Environment, MySQL Governor) and file system isolation (CageFS).

Key Qualities for Success

• Product and Architectural Visionary: Ability to define product direction through technical excellence.
• Game Changer: Proactive initiative to propose and implement transformative technical solutions.
• Universal Engineer: Versatile and adaptable across diverse domains and technologies.
• High Initiative & Performance: Consistently delivering exceptional results and driving improvements.
• Advanced Algorithmic Optimization: Designing and implementing highly efficient algorithmic approaches for complex technical challenges.
• Adept at using AI: Leveraging modern AI tools to enhance productivity and solutions.
• Results-Driven: Focused on achieving strategic objectives and measurable impact.

Responsibilities

Web Optimization:

• Develop and implement solutions to improve web server performance, request handling, and overall system efficiency, validating improvements using benchmarking.
• Configure, optimize, and extend web servers including Nginx, Apache, and LiteSpeed.
• Analyze and enhance the performance of PHP handlers and data transfer mechanisms for web request processing.
• Design scalable, high-performance web systems and infrastructure solutions.
• Implement robust security measures to protect against web attacks and strengthen web server security in production.
• Optimize MySQL and MariaDB queries, improve database performance, and ensure reliable administration for web applications.

CloudLinux Core Features Optimization:

• Maintain and enhance LVE (Lightweight Virtual Environment), focusing on resource limits, CPU throttling, memory limits, and I/O limits.
• Maintain and enhance MySQL Governor for database resource limitation and optimization.
• Maintain and enhance CageFS, focusing on file system isolation, user isolation mechanisms, and security boundaries.
• Design and implement new resource limiting mechanisms and isolation technologies for improved security and performance.
• Architect scalable, high-performance system-level solutions for resource management and isolation.
• Work deeply with Linux system internals, including system calls and system-level programming.

Cross-Cutting Responsibilities:

• Lead technical initiatives and propose changes to solutions and technical direction across web and core features.
• Optimize system performance through profiling, benchmarking, and algorithmic optimization.
• Ensure all technical decisions are data-driven, validated by concrete measurements and profiling.
• Actively contribute improvements to open-source projects and upstream codebases.
• Leverage modern AI tools and techniques to enhance productivity and optimization solutions.
• Mentor and coach engineers, conduct technical reviews, and establish engineering best practices.
• Collaborate with cross-functional teams on technical strategy and roadmaps.
• Troubleshoot complex production issues related to web performance, limits, isolations, and system functionality, implementing long-term fixes.

Required Skills & Experience

• 6+ years of professional software engineering experience in Python.
• Previous experience holding senior, staff, or principal engineering positions.
• Expert-level proficiency in Python programming for web optimization, tooling, automation, and system-level tasks.
• Proven expertise in web performance optimization projects or solutions.
• Deep knowledge and experience with web servers (Nginx, Apache, and/or LiteSpeed).
• Experience optimizing PHP handlers and web request processing.
• Deep expertise in system programming and low-level system optimization.
• Strong understanding of Linux kernel internals, system calls, and kernel-space concepts.
• Experience with resource management technologies (e.g., resource limits, cgroups, namespaces).
• Comprehensive proficiency in Linux system administration, architecture, and optimization.
• High level of security knowledge regarding web attacks, isolation mechanisms, and general Linux security.
• Solid expertise in MySQL and MariaDB, including optimization and administration.
• Demonstrated data-driven approach using benchmarking and measurements to validate technical decisions.
• Experience contributing to public or upstream open-source solutions.
• Strong understanding of the network stack (TCP/IP and HTTP).
• Ability to design scalable, maintainable, and reliable systems at both web infrastructure and system levels.
• Technical leadership experience, including mentoring and driving engineering best practices.
• Knowledge of CI/CD pipelines and DevOps practices.
• Excellent communication and collaboration skills for a remote, distributed team environment.
• English proficiency at an upper-intermediate level or higher.

Benefits

• Fully remote work with flexible working hours, allowing you to work from any location worldwide.
• Focus on professional development and challenging projects.
• Paid 24 days of vacation, 10 national holidays, and unlimited sick leaves.
• Compensation for private medical insurance.
• Reimbursement for co-working spaces and gym/sports activities.
• Budget allocated for education.
• Opportunity for a reward for innovative, patentable ideas.