Preply

Data Engineer (Experimentation)

Barcelona, Spain
Python SQL Django
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Description

Preply is a global language learning marketplace, connecting 50,000+ tutors with millions of learners from all over the world. Since the company launched in 2012, students have signed up to more than 15 million lessons.

Meet the team!

Here in Preply, we a/b test most of our changes on production, both product and technical before scaling it to all customers. Experimentation Squad owns the whole infrastructure that is used to make those business-vital decisions.

You, as a part of the Experimentation Squad, will develop systems that are used by all product and platform squads in their daily work in the decision-making process; figure out how to apply novel experimentation methodologies for the Preply problems; tackle problems that occur in highly loaded systems, such as cross-experiment correlation, data consistency, event deduplication, etc.; design and monitor applications in a way that will guarantee stability and reliability.

We’re using a modern stack, you can check it here: https://tech-radar.preply.com/

We have diverse technical challenges (sometimes we write about them on our Engineering Blog) that will allow you to develop your skills across the stack.

 

What you’ll be doing:

  • Establish credibility with the quality of the a/b testing system
  • Own Data pipelines and ensure Data consistency
  • Support & develop a/b testing interpretation tools
  • Collaborate with product teams to help them tackle technical issues with a/b testing
  • Develop new ways of a/b testing (SEO a/b testing, etc.)

What you need to succeed:

  • Strong knowledge of Python, at least 2+ years of experience.
  • SQL hands-on experience
  • Understanding basics of statistical analysis: p-value, null hypothesis, confidence interval - something you should be familiar with (or is ready to learn these concepts and even more!)
  • A passion for analyzing data to inform decisions
  • Addiction to measuring and monitoring
  • High code-testing standards
  • Readiness to take responsibility for systems that directly impact the company's decision-making process
  • Willingness to educate colleagues (doing knowledge-sharing sessions)
  • Passionate about communication

Would be a plus

  • Experience with a/b testing in production environments
  • AirFlow, Redshift, Django

Why you’ll love it at Preply: 

  • An open, collaborative, dynamic and diverse culture;
  • A generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for your self-development;
  • A competitive financial package with equity, leave allowance and health insurance;
  • Access to free mental health support platforms;
  • A flexible set-up with the option of paid relocation to Barcelona or working remotely within CET or 3 hours from CET;
  • The opportunity to shape the lives of learners and tutors through language learning and teaching in 175 countries (and counting!).

About Preply:

At Preply, we focus on doing better every day – pushing the limits of what we know is possible. And we know our purpose is strong. We’re re-engineering education, providing outstanding experiences for our global community of language learners and building authentic connections across the world.

Propelled by a tenfold increase in revenues over the last three years, thanks to our best-in-class consumer and b2b products, Preply is now leading the online language tutoring segment globally and has 400+ employees of over 50 nationalities based across Barcelona, Kyiv and the US. We do extraordinary things at Preply – and we want you to join us. If you’re committed to curiosity, love experimentation and relish the challenge of exploring new ideas, then it’s time we said: 

Welcome to The World Class. 

Our values:

  • Human: We embrace diversity by fostering inclusive environments where people feel respected and safe to express their opinions.
  • Hungry: We make bold, data-informed decisions to deliver high-impact solutions for our customers.
  • Humble: We experiment continuously by staying open to being challenged, learning from failures and making data-informed decisions.
  • Hackers: We learn by doing, focus on things that matter and move with incredible speed to create simple, creative, and scalable solutions;
  • Curious: We thrive on facing challenges, diving deep to identify root causes and uncovering insights to continuously improve.
  • Learners Obsessed: We put our learners at the core of everything we do to improve the effectiveness of their language learning with us.

Diversity, Equity, and Inclusion

Preply is committed to creating a diverse and inclusive environment where people from all backgrounds can thrive. Different opinions and viewpoints are key ingredients in our success as a multicultural Ed-Tech company. 

That means that Preply will consider all applications for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, disability, age or veteran status. Together, we are The World Class.

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