Senior Software Engineer (Java / Kotlin)

• Massive Scale: Design, build, and optimize systems that handle thousands of requests per minute. This is high-availability, high-performance engineering in practice.
• Modern Tech Stack: Work with a world-class, cloud-native environment. Our core technologies include Kotlin, Spring, Kafka, and Kubernetes.
• True Ownership & Autonomy: Live by a 'you build it, you run it' philosophy. Join an agile, autonomous team with full ownership of your microservices, from design to deployment.
• Complex Challenges: Tackle distributed systems, data streaming and algorithmic optimization to power a massive, real-time marketplace.
• End-to-End ML Systems: Build infrastructure using BigQuery and Apache Spark for offline data processing. Integrate these components with our microservices architecture to create a sophisticated advertising system that powers a personalized user experience.
• Join the Advertising team to build Allegro Ads - one of the most visible products on the platform.

Key requirements:

• Code in Kotlin or Scala with experience in Spring Boot and Kafka to build robust backend systems
• Hands-on experience with Apache Airflow and Spark for managing high-velocity data pipelines and building scalable reporting engines
• Proficient in PostgreSQL with experience in database migrations and designing integrations via APIs
• Enjoy close collaboration with Data Scientists and Analysts to implement complex models and turn raw data into actionable insights
• Enthusiastic about AI and want to stay at the forefront of technical innovation
• Want to build impactful tools for a diverse range of users, helping them understand campaign performance through advanced statistics and dashboards
• Know English at at least B2 level

Nice to have:

• Experience with frontend technologies (React/TypeScript) to help build modern frontend reporting components