Backend Engineer (Kotlin/Kafka) — High-Scale Microservices

Allegro.eu S.A.; Poland; Hybrid; PLN 125,000 - 170,000; Full time

Benefits offered by this job

Hybrid work model

30 days remote work

Equipment provided

Fringe benefits cafeteria plan

English classes

Training budget

Volunteer day off

Team events

Job summary

Allegro Ads in Warsaw seeks a Software Engineer 1 (Java/Kotlin) to help power a massive real-time marketplace. You will own backend services from design to deployment, building robust systems that scale with demand.

You will work with Kotlin, Spring Boot, Kafka, and Kubernetes in a cloud-native environment and collaborate with ML teams to advance end-to-end ML systems using BigQuery and Apache Spark.

Qualifications

• Experience building backend systems in Kotlin or Java with Spring Boot.
• Experience with Kafka data streams and distributed systems.
• Familiarity with Kubernetes in a cloud-native environment.
• Ability to own services end-to-end from design to deployment.
• English communication at B2 level or higher.

Responsibilities

• Design, build, and operate microservices for Allegro Ads backend.
• Develop data pipelines and ML-enabled components with Spark and BigQuery.
• Collaborate with ML teams to deploy real-time advertising features.
• Participate in code reviews, pair programming, and retrospectives.
• Own reliability, performance, and on-call responsibility.

Skills

Kotlin

Scala

Spring Boot

Kafka

Kubernetes

ML concepts

Tools

BigQuery

Apache Spark

GCP

Docker

Job description

Allegro Ads in Warsaw seeks a Software Engineer 1 (Java/Kotlin) to help power a massive real-time marketplace. You will own backend services from design to deployment, building robust systems that scale with demand.

You will work with Kotlin, Spring Boot, Kafka, and Kubernetes in a cloud-native environment and collaborate with ML teams to advance end-to-end ML systems using BigQuery and Apache Spark.