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aleksei alenkin

@alekseialenkin

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Java/Kotlin developer at Deutsche Bank who cut request time from 6 minutes to 20 seconds.

Germany

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At Deutsche Bank, I optimized a heavy HTTP request from 6 minutes to 20 seconds using multithreading. I also increased unit test coverage from 15% to 92% and improved Kafka consumer performance, with p95 latency under 150ms.

At MediaMarkt, I reduced API response time by 35% with Redis caching and full-text search, and led the migration from RabbitMQ to Kafka. I also automated releases with a GitLab CI and Docker pipeline.

At SHELL, I automated sick leave and vacation notifications, reducing application processing time by 30%, and built test analytics with per-topic percentage reporting. I work primarily with Java and Kotlin, and have experience across backend services, databases, and CI/CD.

Experience

Work history, roles, and key accomplishments

Current

Java Developer

Current

Deutsche Bank

Jun 2023 - Present (3 years 3 months)

Optimized a heavy HTTP request, reducing execution time from 6 minutes to 20 seconds using multithreading. Increased unit test coverage from 15% to 92% and optimized Kafka consumer performance with p95 latency under 150ms.

Java 21+Kotlin Spring Boot 3.5 PostgreSQL Kafka Kubernetes Gradle Multithreading Unit Testing Prometheus Grafana

Java Developer

MediaMarkt

Jun 2021 - Jun 2023 (2 years)

Optimized API performance by implementing Redis caching and full-text search, reducing response time by 35%. Led migration of legacy RabbitMQ messaging to Kafka and automated release processes with GitLab CI and Docker.

Java 17 Spring Boot 3 REST Hibernate PostgreSQL Redis Kafka RabbitMQ Gitlab CI Docker Keycloak

Java Developer

SHELL

Mar 2018 - Jun 2021 (3 years 3 months)

Automated sick leave and vacation notifications, reducing application processing time by 30%. Built test analytics with per-topic percentage reporting and fixed over 90% of bugs to ensure stable site operation.

Java 11 Spring Boot 2.7 REST PostgreSQL Maven