Senior Backend Engineer, AI-First Platform (Hybrid, Warsaw)

Box; Warszawa; Hybrid; PLN 180,000 - 230,000; Full time

Job summary

Box, a leading AI-powered content platform, is expanding its Warsaw-based backend team. The role focuses on building a platform that runs daily evaluations to assess the quality of the agentic platform, primarily using Java, Python, PostgreSQL and GCP.

You will join a hybrid team in Warsaw, collaborating across backend engineering, infrastructure and developer tooling, while contributing to reliable, scalable systems and strong developer experience.

Qualifications

• 4+ years of professional software development experience.
• Strong coding skills in Java or Python.
• Experience with Google Cloud Platform and/or AWS.
• Experience with distributed systems, observability and production support.
• Proven ability to design, build, and deploy high-quality software.
• Team player with willingness to help the team thrive.

Responsibilities

• Help build the platform that runs daily evaluations to assess quality of the agentic platform.
• Primarily work with Java, Python, PostgreSQL and GCP.
• Attend team meetings, stand ups, and 1:1s.
• Design and execute technical initiatives.
• Participate in on-call rotation and resolve issues as needed.

Skills

4+ yrs exp

Java

Python

GCP/AWS

Distributed systems

Tools

PostgreSQL

Jenkins

GitHub Actions

Job description

Box, a leading AI-powered content platform, is expanding its Warsaw-based backend team. The role focuses on building a platform that runs daily evaluations to assess the quality of the agentic platform, primarily using Java, Python, PostgreSQL and GCP.

You will join a hybrid team in Warsaw, collaborating across backend engineering, infrastructure and developer tooling, while contributing to reliable, scalable systems and strong developer experience.