Senior Software Engineer (Java / Kotlin)

Allegro is the most popular shopping platform in Poland and the largest e-commerce platform of European origin. It operates a marketplace model with over 135,000 merchants and more than 250 million offers across key categories. The platform reaches 22 million customers monthly, offers fast and free deliveries under Allegro Smart!, and includes modern financial services and a wide pickup network.

• At least 5 years of experience in a similar role.
• Proficient coding skills in Kotlin or Scala with experience in Spring Boot and Kafka.
• Hands-on experience with Apache Airflow and Spark for managing data pipelines and scalable reporting.
• Proficient in PostgreSQL including database migrations and API design.
• Experience with microservices architecture.
• Familiarity with BigQuery and CI/CD processes.
• Enthusiasm for AI and staying at the forefront of technical innovation.
• English language proficiency at least at B2 level.

Nice to have:

• Experience with frontend technologies such as React and TypeScript.

• Design, build, and optimize systems handling thousands of requests per minute with high availability and performance.
• Work with Kotlin, Spring, Kafka, and Kubernetes in a cloud-native environment.
• Own microservices from design to deployment following a 'you build it, you run it' philosophy.
• Address challenges in distributed systems, data streaming, and algorithmic optimization.
• Build infrastructure using BigQuery and Apache Spark for offline data processing.
• Integrate ML components with microservices to create a personalized advertising system.
• Collaborate closely with Data Scientists and Analysts to implement complex models and actionable insights.
• Join the Advertising team to develop Allegro Ads, a prominent platform product.