Open to opportunities

Бац Андрей

@0009394

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Java Software Engineer at Skai.io who cut dashboard load time from 20 seconds to 2.

Ukraine

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What I'm looking for

I'm open to global remote opportunities.

At Skai.io, I developed the Apple Ads API channel and maintained integrations with Amazon Ads/DSP, Criteo, and Kroger Ads. I also optimized data retrieval in a dashboard microservice, reducing page load time from 20 seconds to 2 seconds.

I replaced synchronous REST communication between two major microservices with Kafka-based messaging and released reusable Java libraries adopted by multiple engineering teams. I also migrated legacy backend modules from Scala to Java.

At Gemicle, I worked on a cloud system for transportation data, building Java and Spring Cloud microservices and rewriting a hardware data-ingestion client with Netty for concurrent packet processing.

At SOFTHOUSE, I developed backend logic and REST APIs for a healthcare CRM, integrating services including Rocket.Chat, Google Maps, Google Speech, and Postmark. Earlier, at The State Emergency Service of Ukraine, I set up and maintained Microsoft servers and network equipment.

Experience

Work history, roles, and key accomplishments

Current

Java Software Engineer

Current

Skai.io

Feb 2022 - Present (4 years 9 months)

Designed and implemented the Apple Ads API channel and maintained high-throughput integrations with Amazon Ads/DSP, Criteo, and Kroger Ads. Migrated legacy backend modules from Scala to Java and optimized database queries, reducing page load time from 20 seconds to 2 seconds.

Java Spring Boot MemSQL MySQL Snowflake Redis Kafka RabbitMQ JUnit5 Mockito Cucumber Karate Testim Jenkins Docker Datadog Hosted Graphite Airflow Astronomer AWS Lambda Claude Code GitHub Co Pilot Cursor

Java Software Engineer

Gemicle

May 2021 - Feb 2022 (9 months)

Designed and implemented scalable microservices using Java and Spring Cloud, applying OOP and SOLID principles. Refactored the hardware data-ingestion client using Netty for low-latency concurrent packet processing over the Teltonika protocol.

Java Spring Boot Spring Security OAuth Spring Cloud MongoDB MySQL Redis RabbitMQ Netty JUnit5 Mockito Test Containers Jenkins Docker Kubernetes Zipkin Prometheus Kibana

Java Backend Developer

SOFTHOUSE

Mar 2020 - Apr 2021 (1 year 1 month)

Developed and refactored backend business logic using Java, Spring Boot, Spring Security, and Spring MVC. Designed and implemented secure, scalable REST APIs and integrated third-party services such as Rocket.Chat, Google Maps, Google Speech, and Postmark.

Java Spring Boot Spring Security Spring MVC Hibernate JPA MySQL Redis Flyway RabbitMQ JUnit5 Mockito RocketChat Google Maps Google Cloud Speech API Postmark Freemarker Apache POI Maven Tomcat Lombok

Leading IT Specialist

The State Emergency Service of Ukraine

Oct 2017 - Mar 2020 (2 years 5 months)

Distributed tasks within the team and set up and maintained Microsoft servers. Installed and configured cameras, routers, computers, and other network equipment.

Microsoft Server Administration Network Device Configuration Task Distribution