Open to opportunities

Alexander Vik

@alexandervik

Message

Java/Kotlin backend developer focused on high-load systems and performance optimization.

Russian Federation

Message

What I'm looking for

I seek backend roles (Java/Kotlin) focused on high-load distributed systems, performance optimization, and practical DevOps collaboration, with opportunities for growth.

I am a Java/Kotlin backend developer with 4+ years of experience building and optimizing high-load services across distributed systems.

I designed and implemented reactive WebFlux and KafkaStreams services, led ClickHouse and metrics (Grafana, VictoriaMetrics) deployments, and wrote extensive k8s/Helm configurations for production clusters.

I have repeatedly improved performance by multithreading and SQL optimization (examples: ~20% and ~30% improvements), profiled services under load, and implemented many unit and integration tests to ensure reliability.

I embrace legacy code, quickly learn unfamiliar technologies, and deliver in demanding schedules when required, bringing strong practical experience with Java, Kotlin, SQL/NoSQL databases, Kafka, and cloud-native tooling.

Experience

Work history, roles, and key accomplishments

Current

Java Developer

Current

KIPCODE

Jan 2024 - Present (2 years 5 months)

Developed high-load VoIP services using reactive and stream processing technologies, implemented KafkaStreams-based services and WebFlux reactive endpoints, and improved service performance by up to 30% through multithreading and SQL optimizations.

Webflux Kafka Kafka Streams Clickhouse PostgreSQL Kubernetes Helm Grafana

Kotlin Developer

EsErSpace

Jan 2023 - Jan 2024 (1 year)

Built Kotlin-based services for processing and analyzing airspace data, implemented reactive business logic and a ZooKeeper-based master selection pattern, and improved degraded service performance through async refactoring and query optimizations.

Kotlin Ktor Kafka MongoDB PostgreSQL Redis ZooKeeper Elasticsearch Gatling

Junior Java Developer

JEMCES

Apr 2021 - Jan 2023 (1 year 9 months)

Developed and optimized services for an electronic educational platform using Spring and RxJava, added multithreading to raise performance ~20%, implemented Zipkin tracing and OAuth2 identity flows, and wrote complex SQL queries.

Spring Boot RxJava MySQL MongoDB Redis Kafka Zipkin Junit

Java Developer

Freelance

Jul 2020 - Apr 2021 (9 months)

Delivered web and desktop applications for clients using Java, JavaFX and Spring stacks, integrating databases (PostgreSQL/MySQL) and messaging systems while handling frontend components and UI toolkits.