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About CenturyLink

CenturyLink (NYSE: CTL) at is the second largest U.S. communications provider to global enterprise customers. With customers in more than 60 countries and an intense focus on the customer experience, CenturyLink strives to be the world’s best networking company by solving customers’ increased demand for reliable and secure connections. The company also serves as its customers’ trusted partner, helping them manage increased network and IT complexity and providing managed network and cyber security solutions that help protect their business.

Job Summary

Be a part of the team that is responsible for the architecture, analysis, design, and development of Content Delivery Network software. Work on high-performance distributed systems deployed on a massive scale unmatched in almost any corporate computing environment. Responsibilities include design and implementation of code within the system. Development is primarily in event-driven style of C language on Linux, as well as other languages.

Job Description

  • Designs, develops, maintains, and supports new and existing code written in multiple languages (mostly in C but also one/more of perl, C++, Lua, Python, javascript, Go) on Linux

  • Designs and codes automated unit and system tests using adopted frameworks

  • Reviews peers' designs and code

  • Understands system compionents and how they fit into a complex distributed system

  • Documents and effectively communicates about the work, and implements in a reliable, accurate, and performant way

  • Works within a team under the guidance of more senior developers when appropriate, based on project structure

  • Works with stakeholders in Architecture and Engineering teams to ensure requirements and designs meet expectations

  • Participates in a fast-moving agile planning environment, including planning and estimating work


  • Bachelor's degree or higher in CS or similar field, with 3+ years professional experience, or 2+ years with a Master's Degree

  • Extensive hands-on experience in the development of scalable and secure distributed systems based on high-performance software

  • Strength in fundamental principles of Computer Science

  • Proven ability to work in pure C in a high-performance concurrent event-driven model on Linux or similar system

  • Good understanding of HTTP family protocols

  • Outstanding initiative, self-motivation and drive; excellent written and verbal communication skills; ability to estimate, plan, prioritize and multitask

Ideal candidate will also have:

  • Experience in internals of web server, proxy, or similar code

  • Ability to work in (one or more of) C++, Python, Perl, Lua, and Go

  • Deep knowledge of HTTP family protocols including http2, QUIC

  • Understanding of SSL/TLS

  • Experience tracing and tuning TCP/IP


Bachelors or Equivalent

Masters or Equivalent

Alternate Location: US-Colorado-Broomfield

Requisition # : 212640

This job may require successful completion of an online assessment. A brief description of the assessments can be viewed on our website at

EEO Statement

We are committed to providing equal employment opportunities to all persons regardless of race, color, ancestry, citizenship, national origin, religion, veteran status, disability, genetic characteristic or information, age, gender, sexual orientation, gender identity, marital status, family status, pregnancy, or other legally protected status (collectively, “protected statuses”). We do not tolerate unlawful discrimination in any employment decisions, including recruiting, hiring, compensation, promotion, benefits, discipline, termination, job assignments or training.


The above job definition information has been designed to indicate the general nature and level of work performed by employees within this classification. It is not designed to contain or be interpreted as a comprehensive inventory of all duties, responsibilities, and qualifications required of employees assigned to this job. Job duties and responsibilities are subject to change based on changing business needs and conditions.