Senior Backend Engineer: Scale & AI-Driven Systems

Box; Warszawa; On-site; PLN 260,000 - 380,000; Full time

Job summary

Box is seeking a Senior Software Engineer, Backend, to join our core platform engineering team and help build and operate the backend infrastructure behind authentication, secure access, content transfers, and enterprise collaboration.

The role emphasizes high-scale backend features, distributed systems, and collaboration with teams in Poland and the USA. You will contribute to a robust, AI-aware content platform and participate in Agile ceremonies and on-call responsibilities.

Qualifications

• 6+ years of professional software engineering experience building backend systems.
• Strong Java/Scala development experience in production environments.
• Experience designing and operating distributed systems at scale.
• Strong understanding of system reliability, scalability, performance, and software architecture.
• Experience leading technical initiatives and mentoring other engineers.
• Comfortable working in mature production environments with high quality standards.
• Experience with Kubernetes and at least one major cloud platform (GCP, AWS, or Azure).
• Strong communication skills and ability to collaborate across engineering teams.
• Fluent in English.

Responsibilities

• Develop new backend features focused on high scale and performance.
• Design and implement auto-scaling solutions for microservices.
• Solve challenges related to distributed systems at scale.
• Measure system performance; identify bottlenecks; optimize accordingly.
• Build internal tools supporting testing automation, deployment pipelines & product support.
• Collaborate closely with cross-functional teams across geographies (Poland & USA).
• Participate actively in Agile ceremonies such as daily stand-ups and sprint planning.
• Contribute code reviews ensuring quality standards are met consistently.
• Participate in our on-call rotation, available at all times while on-call to help respond to and triage any issues that arise.

Skills

Java/Scala

Distributed systems

Kubernetes

Cloud platforms

English fluency

Mentoring engineers

Cross-team collaboration

Tools

GCP

AWS

Azure

Job description

Box is seeking a Senior Software Engineer, Backend, to join our core platform engineering team and help build and operate the backend infrastructure behind authentication, secure access, content transfers, and enterprise collaboration.

The role emphasizes high-scale backend features, distributed systems, and collaboration with teams in Poland and the USA. You will contribute to a robust, AI-aware content platform and participate in Agile ceremonies and on-call responsibilities.