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Đorđe Kostić

@orekosti

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Java Software Engineer at TIAC d.o.o. who improved code generation with a custom post-processing solution.

Serbia

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At TIAC d.o.o., I develop Java and Kotlin microservices with Micronaut, using hexagonal architecture and Domain-Driven Design. I also built a custom solution to post-process generated classes, improving the development workflow and code maintainability.

Previously, I implemented backend services across projects at Diligent, Ates Soft, gerniks, and CCBill. My work included an Open Data Contract Standard library implementation for Satja Software Solution and resolving a long-standing issue with ODCS delta calculations.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

TIAC d.o.o.

Apr 2025 - Present (1 year 6 months)

Developing robust and efficient microservices using Java, Kotlin, and the Micronaut framework. Designed and implemented a custom solution to post-process auto-generated classes, improving development workflow and code maintainability.

Java Kotlin Micronaut Framework Hexagonal Architecture Domain Driven Design Gradle Fabrikt OpenAPI Junit Mockito Selenium

Java Software Developer

Diligent

Jul 2024 - Mar 2025 (8 months)

Backend Java Software Engineer building microservices utilizing Apache Spark and Elasticsearch for big data extraction and persistence. Built the Open Data Contract Standard (ODCS) library implementation and solved a long-lasting engineering problem regarding ODCS deltas.

Java Apache Spark Elasticsearch Big Data ODCS Microservices

Java Software Developer

Ates Soft

Jun 2022 - Jul 2024 (2 years 1 month)

Backend Engineer for the Fincore Ltd. MobileAPI team, implementing business logic using Java, Spring MVC, Apache Camel, and Apache CXF. Developed a cloud-native Spring Boot notification proxy service and optimized backend operations with SQL stored procedures and REST APIs.

Java Spring MVC Apache Camel Apache CXF Spring Boot SQL REST APIs Jira CI CD

Java Software Developer

gerniks

Oct 2021 - Jun 2022 (8 months)

Worked on the SHS Viveon RiskSuite project within a J2EE ecosystem, identifying and resolving security flaws including XXE injection and log forging. Maintained and developed REST and SOAP web services with PostgreSQL and MSSQL databases.

Java J2EE EJB JBoss Web Logic REST SOAP PostgreSQL MSSQL Security

Java Software Developer

CCBill

Apr 2021 - Oct 2021 (6 months)

Java Software Engineer for the PhoenixNAP Bare Metal Cloud project, developing microservices using Spring Framework, RabbitMQ, MongoDB, and Keycloak. Utilized OpenAPI Specification with Spring Code Generation and containerized services using Docker and Kubernetes.