Senior Software Engineer (Java / Kotlin) - Allegro Ads

About the job

Massive Scale: Design, build, and optimize systems that handle thousands of requests per minute in a high-availability, high-performance environment.

Modern Tech Stack: Work in a cloud-native environment using Kotlin, Spring, Kafka, and Kubernetes, with exposure to machine learning solutions.

True Ownership & Autonomy: Operate in a "you build it, you run it" model with full ownership of microservices from design to deployment.

Complex Challenges: Solve backend problems related to distributed systems, data streaming, and algorithmic optimization for a real-time marketplace.

End-to-End ML Systems: Build infrastructure using BigQuery and Apache Spark for offline data processing and integrate it with microservices to power a personalized advertising system.

Join the Advertising team

Build Allegro Ads, one of the most visible products on the platform, collaborating closely with Machine Learning teams to deliver high-performance solutions and engineering best practices.

We are looking for people who:

• Code in Kotlin or Scala and have experience with Spring Boot and Kafka to build backend systems
• Have hands-on experience with Apache Airflow and Spark for high-velocity data pipelines and scalable reporting
• Are proficient in PostgreSQL and experienced with database migrations and API integrations
• Collaborate with Data Scientists and Analysts to implement models and transform data into insights
• Are enthusiastic about AI and technical innovation
• Experience with React/TypeScript is a nice to have
• Have English proficiency at least at B2 level

What's in it for you:

• Flexible working hours in a hybrid model (4/1) with 30 days of occasional remote work
• Salary range: PLN 18 850 - 25 900 (contract of employment, tax-deductible cost)
• Annual performance-based bonus
• Modern office equipment and work tools (MacBook Pro or Dell with Windows)
• Cafeteria plan with medical, sports, insurance, and other benefits
• Paid English classes related to your job
• Training budget, hackathons, internal learning platform
• Additional day off for volunteering
• Social events and team initiatives

#goodtobehere means that:

• Work with experienced specialists in an autonomous team structure
• Choose technologies and take responsibility for delivered solutions
• Use a self-service ecosystem with tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions
• Work with large-scale systems: over 1000 microservices, high-throughput data bus, service mesh, petabytes of data, and production ML systems