Software Engineer 2 (Java/Kotlin

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Software Engineer 2 (Java/Kotlin in Others new

Allegro
Full time
Email

Others
10/18/2026
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Warsaw, Poland

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.

Allegro

Allegro is the most popular shopping platform in Poland and the largest e-commerce platform of European origin. We operate a marketplace model which means that customers can buy whatever they need from over 135,000 merchants, who can list an unlimited number of offers on our platform. We offer p...

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