Software Engineer 2 (Java/Kotlin

Responsibilities

• Design, build, optimize, deploy, and operate high-performance backend systems and microservices.
• Develop services in Kotlin and/or Python for Allegro Translations and continuous localization systems.
• Migrate and optimize MongoDB databases for large-scale datasets.
• Connect and orchestrate AI services to execute complex business logic.
• Analyze complex technical implementations and translate business requirements into actionable system architectures.
• Contribute to technical vision and build new projects from the ground up.
• Own services throughout their lifecycle under a you-build-it-you-run-it model.

Requirements

• Professional experience building robust backend systems with Kotlin and/or Python.
• Proficiency in MongoDB, including database migration and performance optimization for large-scale datasets.
• Hands-on experience connecting and orchestrating AI services.
• Interest in AI and technical innovation.
• Ability to analyze complex solutions and define clear system architectures.
• English proficiency of at least B2 level.

Benefits

• Hybrid 4/1 work model in Warsaw with flexible start times between 7:00 a.m. and 10:00 a.m. and up to 30 days of occasional remote work.
• Employment contract with a stated salary range of PLN 14 600 - 20 825 and an annual performance- and company-results-based bonus.
• MacBook Pro or corresponding Dell computer with Windows and necessary accessories.
• Cafeteria-plan benefits including medical, sports, lunch, insurance, and purchase-voucher packages.
• Employer-paid English classes related to the job.
• Training budget, hackathons, inter-team tourism, and access to an internal learning platform.
• Additional volunteering day off and company social events.
• Well-located offices with equipped kitchens, bicycle parking, terraces, ergonomic equipment, and interactive conference rooms.