Software Engineer Internship

New York, NY

Celtra’s SaaS product is used to build and host the highest quality, data-driven video and interactive display ads for 2/3 of Fortune 500 brands. Our servers can handle 100k requests per second, many of which fan out to other services, internal and external. Any downtime costs our advertisers thousands of dollars per minute and costs us even more in reputation.

Your work matters! You will be responsible for:

  • Developing tools and browser extensions.
  • Building prototype web pages.
  • Making the life of Celtra developers and QA team easier!

We expect:

  • Some JS, HTML and CSS knowledge.
  • Some programming skills, and understanding of what APIs are.
  • You are truly interested in how things work and are always willing to dig deeper.
  • Good verbal and written English communication skills.
  • Willingness to constantly learn and improve.
  • Team players.

A bit about our stack:

  • MySQL, DynamoDB, S3 for persistent storage
  • Kinesis, enabling us to be event-driven
  • Programming language of choice is Scala since we need to achieve high concurrency levels (Akka framework is heavily used)
  • We consume both internal and external services (weather, location, audiences,...)
  • AWS and its services is backbone of our infrastructure


About Celtra
Celtra is the Creative Management Platform for digital advertising. Brand and performance advertisers use our fully self-service platform to create, distribute and optimize the highest quality, data-driven ads at scale, across all channels and screens with great efficiency and control. We power the best video, native and rich media ads for 2/3 of Fortune 500 brands.

If you have an interest in a company who’s interested in both your wellness and your wallet (medical, dental, vision, parental leave, education, fitness, commuter, 401k... you get the picture), you should apply. Celtra is headquartered in Boston (MA), with offices in New York City, San Francisco, London (UK), Sydney (AU) and Ljubljana (SI). For more information, visit Celtra at or @CeltraMobile on Twitter.

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