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Viktor Koltcov

@viktorkoltcov

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Senior Java/Kotlin Backend Developer with 10+ years of experience.

Georgia

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What I'm looking for

I'm looking for a challenging role where I can leverage my backend development expertise and contribute to innovative projects in a collaborative environment.

I'm a Senior Java/Kotlin Backend Developer with over 10 years of experience in building scalable microservices and stream processing systems. My journey began with a strong foundation in programming, earning a Bachelor's degree from Ural State Technical University. Throughout my career, I've had the opportunity to work on various complex projects, honing my skills in Java, Kotlin, and a range of modern technologies.

In my recent role at ShiftLab LTD, I led the development of backend solutions using microservices architecture, Postgres, and Apache Flink. My experience also includes significant contributions to supply chain projects and IoT data processing, where I utilized Kafka and Spark to deliver robust solutions. I thrive in collaborative environments, having coordinated teams and contributed to architectural decisions, ensuring that projects are delivered on time and meet high-quality standards.

Experience

Work history, roles, and key accomplishments

Senior Backend Developer

ShiftLab LTD (ex-Arrival team)

Feb 2024 - May 2025 (1 year 3 months)

Worked as a senior Java/Kotlin developer, focusing on building scalable microservices and stream processing systems. Utilized technologies such as Apache Flink, Camunda, and GraphQL to deliver robust backend solutions.

Java Kotlin Spring Boot Microservices Postgres Apache Flink Camunda GraphQL gRPC Parquet

Senior Backend Developer

Arrival

Feb 2021 - Feb 2024 (3 years)

Developed as a senior Java developer on a critical supply chain project, focusing on microservices architecture and data processing. Leveraged Java, Kotlin, Spring Boot, and Apache Flink to enhance system capabilities.

Java Kotlin Spring Boot Microservices Postgres Apache Flink RisingWave

Senior Java Developer

TaskData

Feb 2019 - Feb 2021 (2 years)

Worked as a developer on a project focused on processing stream IoT data, ensuring efficient data flow and system performance. Key technologies included Kafka, Spark, Java, and Docker for robust data handling.

Kafka Spark Java Spring Docker Microservices

Team Lead

NetCracker

Sep 2018 - Feb 2019 (5 months)

Coordinated a 10-member team, managing feature decomposition and work planning for complex projects. Actively participated in design and architecture decisions while contributing to code development.

Team Leadership Architecture Design Java Spring MongoDB PostgreSQL Microservices

Senior Java Developer

NetCracker

Aug 2016 - Sep 2018 (2 years 1 month)

Developed SDN/NFV systems within a large distributed team, implementing core system functions in Java. Collaborated with business analysts and testers, coordinating work with other developers to ensure project success.

Java Spring MongoDB PostgreSQL Microservices NFV Collaboration

Java-Developer

AutoDealer

Jan 2015 - Aug 2016 (1 year 7 months)

Developed a service for viewing documents using Java EE 7, designing the object model (JPA) and service architecture with REST and SOAP interfaces. Optimized SQL queries and database structures, and managed service deployment using Docker and Jenkins.

Java EE JPA REST SOAP SQL Docker Jenkins Database Design

Delphi-Developer

AutoDealer

Jan 2008 - Jan 2015 (7 years)

Developed a desktop client-server application using Delphi and Firebird, participating in all stages of development. Responsibilities included data collection, requirements analysis, UI/UX design, database design, and managing other programmers.

Firebird UI UX Design Database Design Requirements Gathering Team Management