8 days old

Senior Capacity Engineer

Five9, Inc.
San Ramon, CA 94583

Senior Capacity Engineer


Five9 is a leading provider of cloud software for the enterprise contact center market, bringing the power of the cloud to thousands of customers and facilitating more than three billion customer interactions annually. Since 2001, Five9 has led the cloud revolution in contact centers, helping organizations transition from legacy premise-based solutions to the cloud. Five9 provides businesses with cloud contact center software that is reliable, secure, compliant and scalable, which is designed to create exceptional customer experiences, increase agent productivity and deliver tangible business results.


We are actively seeking a Principal Capacity Engineer to join our team. This position will be responsible for ensuring sufficient resources are available to support the Five-9 platform to include Voice, Network, AWS, GCP, X86 Servers (running Windows and Linux), Common Services and core Applications.  A major component of this role is to collect performance and capacity data on all infrastructure systems and services, then analyze and model that data to identify weaknesses and forecast future needs (resources and costs). You will be responsible for the execution of a capacity management strategy, implementing and communicating capacity management processes and implementation of capacity management best practices. You will collaborate with teams to include: Architects, Engineers, Designers and Leadership to identify Key Performance Indicators (KPIs), establish telemetry and document acceptable capacity thresholds.  You will also work to establish site failover capabilities for the Five-9 infrastructure and services to ensure seamless customer experiences.


Key Responsibilities:

  • Proactively work to identify issues before they impact customers.  This is done through proper sizing, load test participation, resource modeling and trending resource usage

  • Connect resource usage to business and financial impacts

  • Assist in the creation of annual infrastructure budget by tracking and reporting capacity related expenses throughout the year

  • Create and communicate capacity forecasts and growth expectations for all components of the Five9 infrastructure

  • Create and present quarterly capacity plans by incorporating technical, statistical, financial and operational data that will be shared with management and will help drive financial decisions

  • Integrate annual budgets into the capacity forecast

  • Work with key stakeholders to drive resource efficiencies and scale

  • Drive best practices around cost management and forecasting

  • Identify capacity risks and mitigate risks in a timely manner

  • Ensure the most effective use of Five9 compute and network resources

  • Ensure systems and solutions are developed consistently with strategic business plan

  • Work with a sense of urgency, especially when addressing risks within the environment

  • Effectively and professionally communicate with team members and customers both internally and externally

  • Maintain capacity planning tools and work with teams to ensure high degree of data integrity


  • 10+ years of professional enterprise infrastructure engineering experience

  • 5+ years enterprise infrastructure capacity management/engineering/planning in network, servers, public cloud, telecom)

  • Experience with statistical analysis, modeling and forecasting

  • Ability to work remotely with a team that may be geographically dispersed

  • Ability to quickly adapt to changes and deal with ambiguit. 

  • Ability to make sound decisions with minimal feedback from management

  • Ability to think critically to solve problems and create/design processes

  • Excellent verbal and written skills and presentations skills

  • Experience working in public cloud environments (AWS, Google Cloud preferred)

Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills.  The more inclusive we are, the better we are.  Five9 is an equal opportunity employer.


Our headquarters are located in the beautiful Bishop Ranch Business Park in San Ramon, CA.





Posted: 2021-05-05 Expires: 2021-06-04

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Senior Capacity Engineer

Five9, Inc.
San Ramon, CA 94583

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