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I'm a full-stack developer with thirteen years of hands-on experience in designing, building, testing, and supporting web/desktop business applications, with focus on Java (SE/EE & Spring) and Python (Generative AI, LLMs, Data Science). I have a strong background in product-oriented development with end-to-end ownership of production systems, and I enjoy turning client requirements into robust production applications. I work with microservice architectures, AI/LLM-enabled products, and data-heavy platforms. I'm an active speaker (DSC Europe 2024) and hold a master's degree in computer science. I thrive in collaborative teams and can contribute across architecture, implementation, and delivery to drive successful product development.…I'm a full-stack developer with thirteen years of hands-on experience in designing, building, testing, and supporting web/desktop business applications, with focus on Java (SE/EE & Spring) and Python (Generative AI, LLMs, Data Science). I have a strong background in product-oriented development with end-to-end ownership of production systems, and I enjoy turning client requirements into robust production applications. I work with microservice architectures, AI/LLM-enabled products, and data-heavy platforms. I'm an active speaker (DSC Europe 2024) and hold a master's degree in computer science. I thrive in collaborative teams and can contribute across architecture, implementation, and delivery to drive successful product development.

Šimun Šunjić

Full Stack Developer, Web Developer, Back-End Developer, +5

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I'm a full-stack developer with thirteen years of hands-on experience in designing, building, testing, and supporting web/desktop business applications, with focus on Java (SE/EE & Spring) and Python (Generative AI, LLMs, Data Science). I have a strong background in product-oriented development with end-to-end ownership of production systems, and I enjoy turning client requirements into robust production applications. I work with microservice architectures, AI/LLM-enabled products, and data-heavy platforms. I'm an active speaker (DSC Europe 2024) and hold a master's degree in computer science. I thrive in collaborative teams and can contribute across architecture, implementation, and delivery to drive successful product development.…I'm a full-stack developer with thirteen years of hands-on experience in designing, building, testing, and supporting web/desktop business applications, with focus on Java (SE/EE & Spring) and Python (Generative AI, LLMs, Data Science). I have a strong background in product-oriented development with end-to-end ownership of production systems, and I enjoy turning client requirements into robust production applications. I work with microservice architectures, AI/LLM-enabled products, and data-heavy platforms. I'm an active speaker (DSC Europe 2024) and hold a master's degree in computer science. I thrive in collaborative teams and can contribute across architecture, implementation, and delivery to drive successful product development.

Available to hire

I’m a full-stack developer with thirteen years of hands-on experience in designing, building, testing, and supporting web/desktop business applications, with focus on Java (SE/EE & Spring) and Python (Generative AI, LLMs, Data Science). I have a strong background in product-oriented development with end-to-end ownership of production systems, and I enjoy turning client requirements into robust production applications.

I work with microservice architectures, AI/LLM-enabled products, and data-heavy platforms. I’m an active speaker (DSC Europe 2024) and hold a master’s degree in computer science. I thrive in collaborative teams and can contribute across architecture, implementation, and delivery to drive successful product development.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Croatian

Fluent

English

Fluent

Work Experience

Senior Software Engineer, Solution Architect at Atomic Intelligence

June 1, 2024 - Present

Lead backend and platform architecture for AI-enabled products. Designed gRPC-based microservices for metadata management across Snowflake, PostgreSQL, MySQL and MSSQL, including NL2SQL for semantic analysis and SQL query generation. Implemented data orchestration with Apache Airflow, Redis caching and event streaming, and async processing of long-running operations. Built an AI-aware data catalog with data lineage and profiling; developed DDL context generation for LLM models and end-to-end metadata orchestration.

Senior Java Developer, Solution Architect at Adcubum

August 1, 2023 - May 1, 2024

Led backend development for insurance domain platforms with microservices, Spring-based architecture, and gRPC communication. Implemented data processing pipelines and integration with legacy systems; containerized services and orchestration in Kubernetes; contributed to architecture decisions enabling scalable, secure APIs and data flows.

Senior Java Developer, Solution Architect at Valcon

March 1, 2020 - August 1, 2023

Built enterprise Java backend microservices with Spring Boot, Spring Cloud, and data-heavy platforms. Designed system architectures, integrated streaming (Kafka) and scheduling (Airflow/Redis) components, and contributed to AI/LLM-enabled feature sets for data platforms and enterprise apps.

Senior Java Developer, Solution Architect at DeepIT d.o.o

August 1, 2018 - March 1, 2020

Led Java backend development and architecture initiatives using Spring Boot, Hibernate, Hazelcast caching, and DTO mapping with MapStruct. Delivered admin desktop and mobile interfaces (Angular/Ionic) and aligned backend services with front-end requirements for robust enterprise apps.

Java Developer, System Integrator, Solution Architect at Hrvatski Telekom d.d

April 1, 2015 - August 1, 2018

Worked on core telecom/financial platforms (BW3, CIF, ESB PSD2) and migrated EJB-based services to REST/Kubernetes. Developed microservices for banking/telecom domains, contributed to SSO/ IDM integrations, and supported cross-country telecom projects with secure, scalable architectures.

Java Developer at Beta Tau Beta d.d

November 1, 2013 - April 1, 2015

Developed Java-based enterprise features and integrations for large-scale systems, contributing to backend services and architectural improvements in collaboration with partners.

Java Developer at Neos d.o.o

September 1, 2012 - May 1, 2013

Frontend/backend development and stack support across Java-based projects, ensuring robust delivery and alignment with project requirements.

Education

Master of Information Sciences (mag. inf.) at Faculty of Organization and Informatics, Varaždin, Croatia

January 1, 2009 - January 1, 2014

Bachelor of Information Technology Engineer (bacc. ing. techn. inf) at Polytechnic of Zagreb, Zagreb, Croatia

January 1, 2006 - January 1, 2009

Master of Information Sciences (mag. inf.) at Faculty of Organization and Informatics, Varaždin, Croatia

January 1, 2009 - January 1, 2014

Bachelor of Engineering in IT Technologies; Bachelor of Information Technology Engineer (bacc. ing. techn. inf) at Polytechnic of Zagreb, Zagreb, Croatia

January 1, 2006 - January 1, 2009

Qualifications

Java SE Oracle Certified Professional Java Programmer

January 1, 2014 - January 19, 2026

Cisco Certified Network Associate (CCNA)

January 1, 2009 - January 19, 2026

Linux Advanced Linux System Administration

January 1, 2017 - January 19, 2026

Secure Software Development

January 1, 2016 - January 19, 2026

Online Certifications (Java EE, Java design patterns, Kotlin, Gradle, Git, Spring Boot, Spring Security, Spring Batch, Docker, Kubernetes, Kafka, Quarkus, OpenShift, WebRTC, Keycloak, Reactive programming, Angular, Ionic, LangChain, Generative AI)

January 11, 2030 - January 19, 2026

Oracle Certified Professional Java Programmer

January 1, 2014 - January 26, 2026

Cisco Certified Network Associate (CCNA)

January 1, 2009 - January 26, 2026

Linux Advanced Linux System Administration

January 1, 2017 - January 26, 2026

Java EE / Java Design Patterns / Spring Certifications (various)

January 11, 2030 - January 26, 2026