Senior Staff Software Engineer, Webapp Infra

Slack

United States Remote

Full time

Software Engineering / Software Developer

May 5

Job Category

Products and Technology

Job Details

Build the infrastructure powering work.

Background

Slack enables people all over the world to communicate and collaborate together. Teams of all scales — from the world’s largest public companies to the smallest of startups — use Slack to get work done, so we take performance and reliability very seriously. A taste of our scale:

  • The average user spends over 10 hours connected and 2.5 hours active in Slack every single day
  • 1.5 billion messages are sent per month, half of those outside the United States
  • Every day we see over 6 million simultaneously connected users, over a billion web requests, and 10s of billions of database queries.

For millions of people, Slack is the primary communication tool they use at work all day long. They expect it to be exceptionally reliable and fast, all the time.

 Infrastructure at Slack

We operate at tremendous scale with systems that process millions of events per second. Our team maintains and builds the lower levels of our stack, including:

  • Edge services
  • Data Stores and Caches
  • Real-time messaging
  • Asynchronous background job processing

We know we’ve done our job correctly when none of our users think about us. We don’t typically ship new user-facing features, but rather ensure our systems are incredibly performant, highly available, reliable, and scalable. In other words, Slack just works seamlessly.

Slack's API and web backend is built on PHP/Hack, and our backend services are written in Java and Go. Our data infrastructure is built on Kafka, Hadoop, Hive, Presto, Spark, and MySQL/Vitess. Our Chief Architect, Keith Adams, spoke about our architecture at QCon in 2016. Bing Wei and Michael Demmer, Backend Engineers on our team spoke about Flannel (our homegrown application aware cache) at QCon in 2017 and Vitess/MySQL at Percona Live in 2017 respectively.

 Our Team

We are a small team making a large impact. We rapidly iterate and work closely with other teams in engineering to ensure we build resilient systems that can scale. We have a strong commitment to quality and understand that simplicity and reliability should be primary aspects of the systems that we build. We are ambitious, independent, and pragmatic.

If you were to join Slack, here the types of things you would do over the course of a typical week:

  • Test out a patch or new build of HHVM
  • Upgrade the Hack language and HHVM runtime
  • Develop shared components in our Hacklang monolith
  • Make improvements to the test harness, linter, and other developer tools that impact all Hack developers at Slack
  • Contribute to the open source Hack/HHVM ecosystem, including projects open sourced by Slack like hack-sql-fake as well as those published by others
  • Collaborate with peers across Engineering to triage bugs and troubleshoot complex production issues across the stack, especially with respect to performance.
  • Write, review, or provide feedback on a technical design proposal.

You may be a fit for this role if you:

  • Have a Bachelor's degree in Computer Science, Engineering or related field, or equivalent training, fellowship, or work experience.
  • Possess strong Computer Science fundamentals: data structures, algorithms, programming languages, operating system, distributed systems, and information retrieval.
  • Have been building large scale systems professionally for 10-15+ years and can point to things you’ve worked on.
  • Have experience with language runtimes, including frequent upgrades
  • Have experience building, profiling, and debugging programming language runtimes
  • Have experience improving performance and reliability of a complex system
  • Have experience working on build systems, deployment tools, and other forms of developer tooling
  • Can jump into situations with few guardrails and make things better.
  • Write code that can be easily understood by others with an eye towards clarity and maintainability.
  • Are a very strong communicator. You’re excited to explain complex technical concepts and share your knowledge with different audiences.
  • Are curious how things work and when things break you are eager and able to help fix them.

Infrastructure is a diverse and inclusive team that treats their colleagues exceptionally well. We are happy to help you learn what you need to know; we encourage and support each other’s growth and thus it’s not expected that you would have expertise across all of these areas.

Slack has a positive, diverse, and supportive culture—we look for people who are curious, inventive, and work to be a little better every single day. In our work together we seek to be smart, humble, hardworking and, above all, collaborative.

Slack is registered as an employer in many, but not all, states. If you are not located in or able to work from a state where Slack is registered, you will not be eligible for employment.Visa sponsorship may not be available in certain remote locations.

Visa sponsorship is not available for candidates living outside the country of this position.

Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring, Salesforce will consider for employment qualified applicants with arrest and conviction records.

For Colorado-based roles: Minimum annual salary of $179,000. You may also be offered a bonus, restricted stock units, and benefits. More details about our company benefits can be found at the following link: https://www.getsalesforcebenefits.com/

At Salesforce we believe that the business of business is to improve the state of our world. Each of us has a responsibility to drive Equality in our communities and workplaces. We are committed to creating a workforce that reflects society through inclusive programs and initiatives such as equal pay, employee resource groups, inclusive benefits, and more. Learn more about Equality at Salesforce and explore our benefits.

Salesforce.com and Salesforce.org are Equal Employment Opportunity and Affirmative Action Employers. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. Salesforce.com and Salesforce.org will not pay any third-party agency or company that does not have a signed agreement with Salesforce.com or Salesforce.org.

Accommodations

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Posting Statement

At Salesforce we believe that the business of business is to improve the state of our world. Each of us has a responsibility to drive Equality in our communities and workplaces. We are committed to creating a workforce that reflects society through inclusive programs and initiatives such as equal pay, employee resource groups, inclusive benefits, and more. Learn more about Equality at Salesforce and explore our benefits.

Salesforce.com and Salesforce.org are Equal Employment Opportunity and Affirmative Action Employers. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. Salesforce.com and Salesforce.org do not accept unsolicited headhunter and agency resumes. Salesforce.com and Salesforce.org will not pay any third-party agency or company that does not have a signed agreement with Salesforce.com or Salesforce.org.

Salesforce welcomes all.

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