Jobs for Developers

Principal Site Reliability Engineer (L5) Core Services

TwilioFull-time$110k - $270k*London, United KingdomNov 10, 2022

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See yourself at Twilio

Join the team as our next Principal, Site Reliability Engineer (L5) - Core Services/Resilience Tech Lead

Who we are & why we’re hiring

Twilio powers real-time business communications and data solutions that help companies and developers worldwide build better applications and customer experiences.

Although we're headquartered in San Francisco, we have presence throughout South America, Europe, Asia and Australia. We're on a journey to becoming a globally anti-racist, anti-oppressive, anti-bias company that actively opposes racism and all forms of oppression and bias. At Twilio, we support diversity, equity & inclusion wherever we do business. We employ thousands of Twilions worldwide, and we're looking for more builders, creators, and visionaries to help fuel our growth momentum.

About the job

This position is needed to help Twilio meet our reliability goals by providing systems, tools and processes to reduce self-inflicted incidents and their impacts across Twilio. 

The Resilience team is focussed on empowering teams to validate their services through isolated testing, strengthening test coverage, measurable code quality improvements, and promoting communities of practice across Twilio engineering teams.

We are  looking for a growth-oriented seasoned engineer who is passionate about building resilience into systems. As an SRE Lead for the team you will provide technical leadership, vision and mentorship to help the team design, deliver and support the above goals. You will be responsible for identifying present and future scalability, reliability and quality gaps, building solutions and tools to fill those gaps as well as empowering teams to establish a culture of testing at Twilio.


In this role, you’ll:

  • Provide engineering leadership and ensure our team is solving critical engineering problems that enable Twilio products to be scalable, resilient and reliable.
  • Collaborate with engineering managers and tech leads, enabling them to create and deliver critical new products, systems and/or features that align with our strategic objectives for Reliability.
  • Design, guide and implement the testing strategies and well as tooling and automation to be used by R&D teams at Twilio for Reliability initiatives.
  • Compose, review and edit your own team as well as peer team’s architectural Blueprints
  • Keep the SRE team aligned with Twilio’s needs, company-wide and advocate for best practices and new technologies in the Twilio engineering organization.
  • Assist with on-call duties to support any services, automation and tools we create.


Not all applicants will have skills that match a job description exactly. Twilio values diverse experiences in other industries, and we encourage everyone who meets the required qualifications to apply. While having “desired” qualifications make for a strong candidate, we encourage applicants with alternative experiences to also apply. If your career is just starting or hasn't followed a traditional path, don't let that stop you from considering Twilio. We are always looking for people who will bring something new to the table!


  • 10+ years of Engineering and SRE experience 
  • Strong experience with Kubernetes.
  • Experience as a technical leader mentoring and providing leadership to engineering teams
  • Experience designing, developing, and maintaining reliable and resilient production systems at scale.
  • Experience with cloud infrastructure and services, especially AWS
  • Strong foundations of Linux servers and networking
  • Strong opinions on proven practices for testing strategies.
  • Proven track record in building internal automation 
  • Proficient with Java and Python
  • Excellent collaborator, ability to foster alignment cross-functionally and cross-organizationally
  • Excellent communication skills. Able to distill key takeaways quickly, able to document and diagram design requirements


  • Experience building test automation frameworks and systems.
  • Knowledge of Infrastructure as code, specifically Terraform.


This role will be in EMEA (Dublin, Ireland) or Remote - UK or London. 

What We Offer

There are many benefits to working at Twilio, including, in addition to competitive pay, things like generous time-off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location.

Twilio thinks big. Do you?

We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts.

So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now!If this role isn't what you're looking for, please consider other open positions.

Twilio is proud to be an equal opportunity employer. Twilio is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Additionally, Twilio participates in the E-Verify program in certain locations, as required by law.

Twilio is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If you need assistance or an accommodation due to a disability, please contact us at [email protected].


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