(Senior) Data Scientist

WELCOME TO OLX

At OLX, we work together to build a more sustainable world through trade.

We make it safe, smart, and convenient to buy and sell cars, find housing, get jobs, buy and sell household goods, and more. Our colleagues around the world help to serve millions of people around the world every month, through its well-loved consumer brands including OLX, Otodom, AutoTrader, Property24.

Join OLX and see how far you can go.

JOIN OLX GENERATIVE AI DATA SCIENCE TEAM 

We invite you to join us on a critical and exciting mission! To expand and scale our recent investments in the Generative AI area to not only embark on exciting projects with our internal customers but also to lead OLX into the future with LLMs and Generative AI. 

This is a unique opportunity to be part of a strategic movement inside the company! You’ll be part of a team that breaks through walls and builds cross-functional connections with everyone around. A team where a common mission and goals matter more than reporting lines. We build on each other, asking for help and support when needed, and we proactively support others. 

As a Data Scientist in the team, you will work with an amazing squad composed of different profiles such as Data Scientists, MLEs, Engineers, Product Managers, and Analytics. Our focus areas revolve around Generative AI and Large Language Models, where we operate within two key Streams: Platform and Transversal Services. Those two will be part of our Data organization. The first of the Streams focuses on enabling capabilities and creating infrastructure for applying Generative AI at scale with controlled cost. The second Stream (which you’ll join!) is dedicated to crafting customer-centric solutions focused on enhancing the discovery experience and seller features, such as:

- Validate and build reusable GenAI services and functionalities, including new user-facing innovations using agents, video, voice, among others, for the later benefit of the CUs;

- Prepare for next-level classifieds with new GenAI-enabled capabilities, in the form of reusable services across CUs - this means personalization, recommendations and assistants!

- Validate GenAI-enabled solutions which can provide a step change to the user experience, but are riskier (and therefore might not have space in short-term Product roadmaps). These opportunities are likely to “fall between the cracks”. So, your turn!

In your role, you'll dive into cutting-edge machine learning techniques, specializing in LLMs and GenAI, while also providing technical guidance to junior team members. Applying AI methods to core OLX product platforms deployed in the cloud that are affecting the user experience for millions of visitors per month, rolling your solutions to production, analyzing model results offline and online, and measuring site impact. All using Python and the AWS cloud. You will be exposed to key stakeholders, have direct contact with internal customers. You will have the carte blanche to experiment and test things. And most importantly, you will also witness how your work impacts the day-to-day business of our customers.

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What you will do in Data Science at OLX:
- Work in the Data Science team, focusing on LLMs and GenAI, from a platform and marketplace perspective.
- You will build models, tinker around them to make them work, test them, and eventually deploy them to production. You will see your stuff in action and you will be able to measure the true impact of your models 
- You will maintain strong relationships with stakeholders. This means asking a lot of questions to business people and translating their requirements into achievable projects. It also means collaborating with other teams, like infrastructure and data engineering to get things done in an elegant and timely manner.
- Partner with Engineering and Product to deliver solutions (customer-facing and platforms) to our customers (internal and end customers) 
- Work with Product Analytics to track the KPIs of different ML use cases and measure the impact on our customers. 
- Partner with the Experimentation team to integrate the KPIs and their proxies into the Experimentation (A/B testing) platform.
- You will work in multi-functional teams, in a diverse, multinational environment, filled with people from Portugal, Bulgaria, Romania, Poland, Ukraine, Kazakhstan, and Uzbekistan.
- Most importantly, you will have fun working with us :)

Who we’re looking for:
- You must be located in Barcelona.
- Solid background in statistics and modeling.
- Good knowledge of Python, which means having experience with the most common data packages and libraries as well as the ability to develop and maintain simple services.
- Experience with AI Agents frameworks (Pydantic AI, Google ADK, Langchain, etc.).
- Experience with LLM observability, evaluation and tracing concepts (LLM as a judge, sampling monitoring, etc.) and frameworks (Langfuse, Arize AI, etc.)
- Hands-on experience with Machine Learning (supervised, unsupervised, etc.). 
- Very good knowledge of NLP and Deep Learning (Embeddings, Language Models, Transformers, etc.).
- Good knowledge of Generative AI and Large Language Models (LLMs).
- Good understanding of engineering best practices, that is: testing, CI/CD, monitoring, alerting, and containers.
- Hands-on experience with SQL.  
- Experience with MLOps.
- Proficient in English with excellent written and oral communication skills!
- Strong presentation skills.
- Able to work in diverse, multi-functional teams with people from different backgrounds.

Nice to have:
- Exposure to other programming languages such as Kotlin, Java, Scala, etc
- Experience bringing models into production and serving models at scale
- Experience using AWS for deploying machine learning solutions
- Experience with Infrastructure as code (Terraform)
- Experience with building data pipelines using tools like Spark and Airflow
- Understanding of A/B testing and experimentation
- Exposure to MLOps tools

What we offer:
- Permanent contract
- Salary + annual bonus 
- Work with and impact all OLX services in Europe
- Train and conference budget and free access to Udemy courses
- Health insurance and life insurance
- MacBook Pro along with necessary accessories to make your work comfortable
- 100% remote work (and the possibility to work from our office in Barcelona)

Our hiring process:
- Recruiter Interview
- Hiring Manager Interview
- Technical Interview
- Take-home Exercise + Panel Interview

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Diversity, Equity and Inclusion at OLX

OLX values diversity and welcomes applicants of all races, ethnicities, disabilities, ages, genders, sexual orientations, religions, backgrounds, and experiences to apply. If this role excites you, we encourage you to apply, even if you don’t meet all the requirements - you may be just the right fit for this or other opportunities with us!

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