Senior Site Reliability Engineer, CDN at Optimizely

| San Francisco
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Company Description

Optimizely is the world's leader in customer experience optimization, allowing businesses to dramatically drive up the value of their digital products, commerce and campaigns through its best in class experimentation software platform. By replacing digital guesswork with evidence-based results, Optimizely enables product and marketing professionals to accelerate innovation, lower the risk of new features, and drive up the return on investment from digital by up to 10X. Over 26 of the Fortune 100 companies choose Optimizely to power their global digital experiences. Optimizely’s impressive customer list includes eBay, FOX, IBM, The New York Times and many more global enterprises.

Job Description

SREs at Optimizely are focused on making Optimizely the most reliable, performant and trustworthy Digital Experience Optimization platform ever. Our engineering teams have built data pipelines that process 10 billion events daily and applications that support powerful experimentation and collaboration workflows at scale. Our platforms are built on AWS and GCP. We use technologies such as Cloudflare Workers, Akamai, PostgreSQL, and Honeycomb. We build and manage our systems using tools such as Travis CI, Jenkins, Docker, and Terraform This is a unique opportunity to lead the engineering organization in areas of state-of-the-art observability, service-oriented architectural excellence, and forward-looking planning and execution of large technical projects.

How will you make an impact

  • Set up strong monitoring and alerting on our CDN providers for our assets delivered
  • Understand the performance in each region across all our CDN providers
  • Make improvements to our CDN performance via configuration changes; E.g. know and make recommendations to caching strategies (TTL, header values, etc)
  • Streamline collection of RUM metrics on the backend (we have around 1.6 billion activations of our JS per day, each of which sends RUM data back - currently we sample at < 1% but we’d like to scale this up)
  • Speed up queries and report generation of RUM data using our query engine (currently we use that queries AWS RDS instances - we need to speed this up and are open to recommendations here to change our core stack)
  • Respond to CDN emergencies as the primary point-of-contact
  • Work with our customer success teams to triage CDN issues reported by customers
  • Interface with our CDN vendors, negotiate contracts with them, reduce our costs, suggest new vendors
  • Implement a CDN onboarding strategy where we test out new CDN vendors for a while before signing up a new contract with them
  • Establish internal best practices around CDN usage and help product teams integrate our CDN into their architecture with the right caching strategy
  • Keep up with developments in the CDN industry, seek out new ways to leverage them at Optimizely. Prototype their usage.


  • You are comfortable to strong with scripting tools (e.g. Python, Ruby, Unix shell, etc.), monitoring tools (e.g. Catchpoint, Speedcurve, etc.), and command line tools (e.g. dig, trace, etc.)
  • You have a deep understanding of DNS, Anycast, global Internet routing architecture, major exchange points, CDN standards and diagnostics. E.g. you are able to observe, troubleshoot, and explain routing issues
  • You can architect, implement and integrate tools, processes and appropriate homegrown solutions when necessary to monitor, balance and troubleshoot multiple CDNs on a global scale. E.g., you are able to use monitoring insights to drive changes in CDN configuration via APIs.
  • You are able to define and execute continual coverage plans for critical pieces of infrastructure
  • Bonus points if you have experience managing relationships with vendors on large contracts (>$1mm)

Additional Information

At Optimizely, we embody inclusion and embrace diversity. We believe in work/life balance and bringing our true selves to work. To that end, we offer best-in-class perks and benefits that support our Optinauts along their career journey with us. Read more about our culture at

Optimizely is an equal opportunity employer and makes employment decisions on the basis of merit. Optimizely prohibits discrimination based on race, color, religion, sex, sexual identity, gender identity, marital status, veteran status, nationality, citizenship, age, disability, medical condition, pregnancy, or any other unlawful consideration. All your information will be kept confidential according to EEO guidelines.

Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

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Technology we use

  • Engineering
    • JavaLanguages
    • JavascriptLanguages
    • PythonLanguages
    • jQueryLibraries
    • ReactLibraries
    • AngularJSFrameworks
    • HadoopFrameworks
    • Node.jsFrameworks
    • SAP HANADatabases


631 Howard Street, San Francisco, CA 94105

An Insider's view of Optimizely

How has your career grown since starting at the company?

Optimizely's environment encourages us to try new things! I've grown from an entry level job (Technical Support Engineer) to a pre-sales technical role and it has been an incredible experience. Not only did my technical knowledge improve, but I also receive guidance from inspired co-workers, and continue to sharpen my professional skill set.


Sales Engineer

How do you empower your team to be more creative?

As a leadership team, we are deeply committed to creating a culture based on inclusion, experimentation, innovation, and feeling empowered to take risks. To be successful, we have to be exceptional performers. And to be exceptional performers, we have to have passionate people driving the way.


Chief People Officer

What are Optimizely Perks + Benefits

Optimizely Benefits Overview

At Optimizely, we offer a wide array of benefits and perks to help our employees strike just the right balance between work time and personal time. We’re all about optimizing productivity by maximizing joy.

Volunteer in Local Community
Partners with Nonprofits
Friends Outside of Work
Eat Lunch Together
Intracompany Committees
Open Door Policy
Team-Owned Deliverables
Team-Based Strategic Planning
Group Brainstorming Sessions
Open Office Floor Plan
Documented Equal Pay Policy
Unconscious Bias Training
Health Insurance & Wellness Benefits
Flexible Spending Account (FSA)
Disability Insurance
Dental Benefits
Vision Benefits
Health Insurance Benefits
Life Insurance
Wellness Programs
Retirement & Stock Options Benefits
Company Equity
Child Care & Parental Leave Benefits
Generous Parental Leave
Flexible Work Schedule
Optimizely provides employees a working schedule with flexible start and end times.
Remote Work Program
Family Medical Leave
Vacation & Time Off Benefits
Unlimited Vacation Policy
Paid Holidays
Paid Sick Days
Perks & Discounts
Beer on Tap
Casual Dress
Commuter Benefits
Company Outings
Optimizely hosts company wide and team events throughout the year.
Free Daily Meals
Stocked Kitchen
Some Meals Provided
Happy Hours
Happy hours are hosted at team's discretion.
Fitness Subsidies
Professional Development Benefits
Job Training & Conferences
Optimizely offers employees professional development opportunities like Annual individual budget for training, Onsite training courses, The ability to attend job related conferences and seminars.
Tuition Reimbursement
Diversity Program
Lunch and Learns
Optimizely employees are offered various lunch and learn meetings on occasion.
Promote from Within
Continuing Education Stipend
Online Course Subscriptions Available
Customized Development Tracks
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