Junior Data Engineer

Smadex is a cutting‑edge ad‑tech company: we process more than 4.5 million ad requests per second, replying under 100 ms (for reference, the Google search engine handles ~76,000 QPS). Every day we generate several TBs of data that need to be processed, analyzed and aggregated, so our real‑time components get smarter every day. We need you to help us keep our platform in motion! If you are ready to boost your professional career in the tech world, this is your opportunity.

The team

You will join our core engineering team, a collaborative group of experienced engineers responsible for enabling complex data to be available in the real‑time bidding platform for the Machine Learning models to use. We foster a fast‑paced, supportive environment where knowledge sharing is key. We value autonomy and will provide the platform for you to grow your career while solving complex engineering challenges.

What are we looking for?

We’re looking for an enthusiastic Junior Data Engineer who is passionate about data pipelines and excited by extreme performance challenges. Your success will be measured by your ability to help build robust data pipelines, deliver high‑quality features, and collaborate closely with the team while eagerly learning and applying your knowledge effectively.

What will you do at Smadex?

You will dive into a dynamic environment, tackling short‑cycle tasks such as implementing complex data ingestion services, following a “you build it, you run it” philosophy. You will be expected to participate in code reviews, contribute to technical and architectural decisions, and collaborate in a fast‑paced environment where every opinion counts.

Key Responsibilities

• Feature Ownership : Design, develop, and implement Data features for the Machine Learning models to use.
• Quality Assurance : Write clean, efficient, testable code and thoroughly test work locally and in a sophisticated staging environment.
• Operational Excellence : Monitor deployments and help ensure the stability, reliability and performance of production systems.
• Agile Collaboration : Collaborate with the team in an agile environment, participating in planning and reporting on progress.

Requirements

• A Bachelor's degree in Computer Science or a related technical field.
• 1‑2 years of experience in Software or Data engineering.
• SQL Knowledge.
• Python or Java knowledge.
• Interest in Big Data, Machine Learning and Data Engineering.
• Excellent communication skills in English (written and spoken).

What Will Make You Stand Out (Bonus Points)

• Scala knowledge.
• Experience with Key‑Value stores and in‑memory databases (e.g. Redis, Memcached).
• Familiarity with cloud environments, particularly AWS.
• Experience with Airflow workflows.
• Experience in Big Data.
• Experience with Spark.

Our Tech Stack

• Languages: Python, Scala and bash.
• Frameworks: Spark.
• Databases: MySQL, Redis.
• Cloud & DevOps: AWS, Jenkins, Docker, Airflow.
• Tools: Git, Jira, Notion.

What We Offer

• Join a highly motivated and talented team in a fun and friendly work environment.
• Opportunity to work in a complex environment and gain experience from it.
• Directly add value to the business with the projects that you are assigned.
• Great compensation package.
• Top location at the heart of Barcelona with a rooftop terrace, Barbeque, and a fully stocked fridge.
• Great work‑life balance: work from home (2 days per week) and flexible hours.
• Professional development with a LinkedIn Learning subscription and other training opportunities.
• Meal vouchers – Ticket Restaurant monthly allowance.
• Monthly gym allowance: Choose between DiR and Wellhub.
• Monthly TGIF events and regular team‑building activities.
• Ping‑pong table and arcade machine.
• And more!

Please note that we do NOT provide VISA sponsorship. Candidates without a legal permit to work in Spain won't be considered.