Senior Software Engineer (Java / Kotlin) - Product Page

Allegro operates at a massive scale maintaining critical backend infrastructure for the checkout and purchase path. The Razor team provides essential offer data to nearly 60 critical services across mobile, web, and desktop, handling traffic up to 50,000 requests per second on nearly 500 instances. The environment emphasizes performance optimization, scalable architecture, and high availability.

• Minimum 5 years of commercial experience building and maintaining complex, high-scalability systems.
• Proficiency in Java and Kotlin, especially in reactive programming.
• Hands-on experience and advanced knowledge of MongoDB (nice to have).
• Business-oriented mindset with experience collaborating with Product Managers.
• Proven ability to work effectively in a team environment.

• Design, build, and optimize high-availability, high-performance backend systems handling thousands of requests per second.
• Maintain system stability through participation in a structured on-call rotation.
• Collaborate frequently with other technical teams to deliver shared goals.
• Partner with Product Managers to analyze business requirements and drive initiatives.
• Develop new tools based on Large Language Models.
• Share knowledge and mentor less experienced colleagues.