Сергій

Sergei Batiuk
Backend engineer on JVM (Java & Scala)

Summary

I am a backend engineer with over 15 years experience of development with Java programming
language. I also have several years of experience with Scala.

I am a team player.

I have good communication skills, both written and spoken. I can communicate with customers and
team members efficiently, share and apply my experience, mentor other team members where
applicable. I love to learn from others as well.

Contact Information

Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)

Skills

Architectures Microservices, Monolith
Programming languages Java 21, Scala 2.x-3.x
Web Frameworks Spring Boot, Spring MVC, WebFlux, Http4s
Concurrency Akka {Actors, Streams}, Cats Effect, FS2, Project Reactor
DB Access JDBC, R2DBC, Hibernate, Doobie
Tools Maven, Gradle, SBT, Docker, Redis, Elk, InfluxDB,
Kibana/Grafana, VisualVM
Development Jira, Gitlab, Github, CI/CD
Testing JUnit, Mockito, ScalaTest, ScalaMock
Databases MySQL, PostgreSQL, MS SQL Server, Cassandra
OS Linux, Windows

Languages

Ukrainian, Russian Native
English Fluent
Work experience

Employer Nayax Retail
Duration October 2023 - August 2025
Highlights Team Lead
Performance optimization
New features
Growing a team
Tech stack Java: JDK 8-17
Spring Boot, WebFlux, Spring Batch
SQL Server, Kafka
Docker, Linux

Employer AlphaServe
Duration June 2021 - June 2023
Highlights Performance optimization
Improvement in testing
New features
Monitoring for performance
Dev interviews
Tech stack Java: JDK 8-17
Spring Boot, Guava, Jackson
JUnit, Mockito
Docker, ELK, Redis, PostgreSQL
Scala: 2.13
Play Framework, Akka Actors/Streams

Employer Itera
Duration August 2020 - June 2021
Highlights App development from scratch
Tech stack Java: JDK 8
Micronaut, JOOQ, PostgreSQL, Flywheel
JUnit

Employer Castille Labs
Duration November 2019 – July 2020
Highlights Java developer
Tech stack JDK 8
Microservices
Spring Boot, Spring Cloud, Hibernate, Maven, JUnit
Docker, MySQL, RabbitMQ
GCP

Employer Virtuace
Duration February 2019 – September 2019
Highlights Team lead, developer, release manager, legacy application
Developer interviews
Unit tests introduction
Tech stack Java
Hibernate, Maven, JUnit JSF
Windows Server, MS SQL Server
Jenkins, Octopus
Freelancer
Duration 2017 – February 2019
Highlights Web apps development
Tech stack Java
Spring Boot, Hibernate, Gradle, Maven, JUnit
Scala
MySQL
Docker, Jenkins

Employer TMail
Duration 2010-2016
Highlights App development from scratch
Dev infrastructure management
Participation in hiring new developers
Developed most of the backend from scratch to release
Java (JDK 8)
Jersey, Spring Transactions, Solr, Antisamy, JUnit
MySQL, Memcached, Redis, Linux AWS EC2/S3
Employer Luxoft
Duration 2009-2010
Highlights Development services for a major bank
Team lead (Coordination of a distributed team)
Hiring new developers
Tech stack Tibco, Java
Linux, SOA
Oracle database

Employer Ciklum
Duration 2005-2009
Highlights Airline ticketing application
Developer, Team Lead

Tech stack Java
JUnit
MySQL, CruiseControl
Linux