Data Engineer (Experimentation Squad) (offline)

We are currently looking for a Data Engineer in the Experimentation Squad with a strong Data background, so that you’ll be able to apply the whole spector of your skills to maintain and develop the “brain” of Preply - A/B testing system.

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 Experimentation Squad, will develop systems that are used by all product and platform squads in their daily work in the decision making process; tackle problems that occur in highly loaded systems, such as cross-experiment correlation, data consistency, event deduplication, etc.; design and monitor architecture in a way that will guarantee stability and reliability in the highly variative environment where 60+ developers deploy production 50+ times a day.

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

We work in small teams, thus you will be able to influence system design and contribute a lot in the company's growth, also we promote self-direction to work on meaningful projects, while we also strive to create an environment that provides the support and mentorship needed to learn and grow.

Responsibilities:
- 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 we are looking for:
- Strong knowledge of Python, at least 2+ years experience.
- SQL hands-on experience.
- Understanding basics of statistical analysis: p-value, null hypothesis, confidence interval - something you should be familiar with.
- A passion for analyzing data to inform decisions.
- Addiction to measuring and monitoring.
- Readiness to take responsibility of systems that directly impact company decision making process.
- Minimum B2 English level is a must.

Our Engineering Blog https://medium.com/preply-engineering
Open source https://github.com/preply/graphene-federation

What we offer:
- An opportunity for personal and professional growth, supported by high functioning teams, stellar investors and the exciting challenges that come with joining a company at the start of its growth trajectory.
- An environment free of bureaucracy and corporate constraints; a culture where your opinion is highly valued and appreciated.
- An open, collaborative, dynamic and international culture.
- A monthly allowance for self-development on Preply.com.
- A competitive financial package, with generous leave allowance and health insurance.

About Preply

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.
Backed by some of the world’s leading investors, Preply is on a mission to shape the future of effective learning. Fueled by a belief that live engagement with a teacher is still the most effective way to learn a new skill, Preply is building a personalized learning space that will enable individual learners to reach their goals in the fastest way possible.
Powered by a tenfold increase in revenues over the last three years, 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. Preply is driven by a culture of experimentation and data-driven learnings, focused on building best-in-class consumer and enterprise solutions.

Company website:
https://preply.com/

DOU company page:
https://jobs.dou.ua/companies/preply/