Available to hire
Java developer and software engineer with 20+ years of experience in object-oriented analysis, design, and development. My day-to-day work focuses on Java, Spring, and Spring Boot, with hands-on experience in microservices architecture, full-stack development, and ETL/data-engineering pipelines.
I also contribute to technical writing and enterprise prototyping, delivering back-end and full-stack solutions across multiple corporate and community projects. Open to contract and permanent roles.
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Beginner
Language
Javanese
Fluent
Work Experience
Full-stack Java/JavaScript Developer, Data Engineer at Independent Contractor
May 31, 2025 - August 28, 2025Performed development of SpringBoot-based microservices, built data ingestion pipelines using Python, AWS, and DocumentDB, and enhanced web UI Angular applications. Handled data engineering tasks including data ingestion, wrangling, analysis, and anomaly detection.
Full-stack Java/JavaScript Developer, Data Engineer at Independent Contractor, Czech Republic
May 31, 2025 - August 28, 2025Developed SpringBoot-based microservices and data ingestion pipelines utilizing Python, AWS, and DocumentDB. Enhanced Angular-based web UI applications. Performed data engineering tasks including ingestion, wrangling, analysis, and anomaly detection.
Software Architect, Full-stack Java/JavaScript Developer at Independent Contractor
June 30, 2024 - August 28, 2025Designed system architecture for a smart garden monitoring and control system. Developed data processing and wrangling layers, designed and administered databases, and built the sensor and control/monitoring web UI layers.
Software Architect, Full-stack Java/JavaScript Developer at Independent Contractor, Czech Republic
June 30, 2024 - August 28, 2025Responsible for architectural design and development of a smart garden monitoring and control system. Developed data processing layers, designed and administered databases, created sensor layers, and built React-based monitoring/control web UI.
Full-stack Java/JavaScript Developer at Independent Contractor, Freelance
February 28, 2023 - August 28, 2025Developed enterprise Java EE, Spring/Spring Boot, MEAN, and LAMP applications. Built web UIs with JavaScript and AJAX, architected system integrations for B2B solutions using SOAP and REST, performed data wrangling and multi-channel monitoring system development, and conducted technical writing.
Full-stack Java/JavaScript Developer at Independent Contractor, Freelance, Czech Republic
February 28, 2023 - August 28, 2025Developed enterprise Java EE, Spring/Spring Boot, MEAN, and LAMP applications. Built JavaScript and AJAX based UIs, handled system integration and B2B solutions using SOAP and REST, and implemented data wrangling and multi-channel monitoring systems. Performed technical writing.
Independent Contractor — Java Developer & Software / Data Engineer
June 1, 2017 - PresentFreelance/contract work delivering enterprise back-end and full-stack solutions. Focus on Java/Spring/Spring Boot development, micro-service design and architecture, plus data engineering tasks such as ingestion, wrangling, monitoring, and anomaly analysis. Responsibilities also include technical writing and enterprise prototyping across hardware/software platforms, including Spring AI, Quarkus, AWS, Docker, Kubernetes, Python/PySpark, and ETL pipelines. Examples include: LinkSoft IDC (Spring Boot microservices + Python/AWS/DocumentDB ingestion + Angular UI), Smart Garden monitoring/control system (Java/Spring Boot back-end, data-processing layer, DB admin, and monitoring UI), and enterprise Java applications with B2B SOAP/REST integrations and multi-channel monitoring.
Independent Contractor — Java Developer & Software / Data Engineer at Freelance / contract engagements
June 1, 2017 - PresentHands-on Java development delivering enterprise back-end and full-stack solutions across corporate and community projects. Work centered on Java, Spring and Spring Boot, and extends into system design/architecture and data engineering: ingestion pipelines, data wrangling, anomaly analysis, and multi-channel monitoring/control systems. Also provides technical writing and enterprise prototyping spanning JDK, Spring Boot, Spring AI, Quarkus, AWS, Docker/Kubernetes, and data tooling (Python, PySpark, Airflow).
Senior Java EE Developer at Anywhere s.r.o, for Commerz Systems
May 31, 2017 - August 28, 2025Adjusted and enhanced persistence and business layers, web UI, unit tests, and implemented business rules for a trade reporting system. Wrote support documentation and managed acceptance of change requests.
Senior Java EE Developer at Anywhere s.r.o for Commerz Systems, Prague, Czech Republic
May 31, 2017 - August 28, 2025Worked on trade reporting system by adjusting and enhancing persistence, business layers, and web UI. Implemented rules, improved unit tests and authored support documents, managing change request acceptance.
Senior Java EE Developer at Anywhere s.r.o. for Commerz Systems
June 1, 2015 - May 31, 2017Enhanced persistence and business layers, web UI and unit tests for a trade reporting system. Implemented and adjusted business rules, managed change requests, and supported related documentation.
Senior Java EE/Web Developer at Mangas Gaming
May 31, 2014 - August 28, 2025Developed and enhanced presentation layer components and web UI for an e-Gaming application. Adjusted back-end components and created functional and integration tests.
Senior Java EE/Web Developer at Mangas Gaming, Sliema, Malta
May 31, 2014 - August 28, 2025Developed and enhanced presentation layer components and Web UI for an e-Gaming application. Adjusted backend components and created functional and integration tests.
Senior Java EE/Web Developer at UNICORN
October 31, 2013 - August 28, 2025Developed and enhanced presentation layer components and web UI for a European energy management system. Created functional and integration tests.
Senior Java EE/Web Developer at UNICORN, Prague, Czech Republic
October 31, 2013 - August 28, 2025Enhanced presentation layer components and UI, and created functional and integration tests for a European energy management system.
Senior Java EE / Web Developer at Mangas Gaming
October 1, 2013 - May 31, 2014Developed and enhanced presentation-layer components, web UI and back-end components for an e-gaming application. Created functional and integration tests.
Senior Java EE / Web Developer at UNICORN
May 1, 2013 - October 31, 2013Developed and enhanced presentation-layer components and web UI for a European energy management application. Created functional and integration tests.
Senior Software Developer at Tieto s.r.o
May 31, 2011 - August 28, 2025Developed and enhanced an enterprise Eclipse plug-in, focusing on UI integration and adjusting plug-in functionality.
Senior Software Developer at Tieto s.r.o, Ostrava, Czech Republic
May 31, 2011 - August 28, 2025Developed and enhanced Eclipse plug-ins focusing on UI integration and functional adjustments.
Senior Software Developer at Tieto s.r.o.
May 1, 2010 - May 31, 2011Enterprise Eclipse plug-in development: implemented UI integration and adjusted plug-in functionality using Eclipse PDE and SWT. Coordinated development tasks via Jira/Jenkins workflows.
Java Developer at Monster Technologies
April 30, 2010 - August 28, 2025Developed web/intranet collective intelligence system features including data feeding, XML document generation and validation, and Python deployment scripts.
Java Developer at Monster Technologies, Prague, Czech Republic
April 30, 2010 - August 28, 2025Developed data feeding system, job XML document generation and validation, and Python deployment scripts for a collective intelligence job/resume search platform.
Java/Web Developer at Monster Technologies
March 31, 2009 - August 28, 2025Developed web UI and back-end Java classes for scholarship management and education information systems, enhancing and adjusting administrative tools.
Java/Web Developer at Monster Technologies, Prague, Czech Republic
March 31, 2009 - August 28, 2025Developed web UI and backend Java components for scholarship management and education information systems projects for US clients.
Java / Web Developer at Monster Technologies
July 1, 2007 - April 30, 2010Built a collective-intelligence job/resume search system: implemented data feeding and Job XML document generation/validation. Developed Python deployment/installation scripts. Also built scholarship management and education information systems with web UI and Java back-end components supporting administration tools.
Web Developer at Freelance
August 31, 2002 - August 28, 2025Developed web-based client management and dictionary applications, handled relational database design, front-end UI development, XML/XSLT filter creation and servlet development.
Web Developer at Freelance, Buenos Aires, Argentina
August 31, 2002 - August 28, 2025Created web-based client management and dictionary applications, involving database design, Java servlets, XML, XSL, and front-end UI development.
Java Developer at Analyte
September 30, 2001 - August 28, 2025Designed XML templates for quality check routines and adjusted the front-end UI to manage them. Optimized system mechanisms implementing business logic.
Java Developer at ANALYTE firm, Buenos Aires, Argentina
September 30, 2001 - August 28, 2025Designed XML templates for quality check routines and enhanced front-end UI; optimized business logic mechanisms in an enterprise quality management system.
Education
Master’s Degree at Kharkiv Aviation University, Ukraine
January 11, 2030 - August 28, 2025Master’s Degree at Kharkiv Aviation University, Ukraine
January 11, 2030 - August 28, 2025Master’s Degree at Kharkiv Aviation University
January 1, 0000 - January 1, 0000Master’s Degree at Kharkiv Aviation University
January 11, 2030 - July 30, 2026Qualifications
IBM Certified Visual Basic Programmer
January 1, 1999 - August 28, 2025Sun Certified Java Programmer
January 1, 2000 - August 28, 2025Brainbench Certified Web Developer
January 1, 2006 - August 28, 2025Sun Certified Web Component Developer
January 1, 2008 - August 28, 2025Oracle Certified Professional, Java EE Business Component Developer
January 1, 2012 - August 28, 2025Oracle Certified Expert, Java EE 6 Java Persistence API Developer
January 1, 2012 - August 28, 2025Oracle Certified Expert, Java EE 6 Web Services Developer
January 1, 2013 - August 28, 2025Neo4j Certified Professional
January 1, 2017 - August 28, 2025Data Engineering Foundations, NASBA
January 1, 2025 - August 28, 2025IBM Certified Visual Basic Programmer
January 1, 1999 - August 28, 2025Sun Certified Java Programmer
January 1, 2000 - August 28, 2025Brainbench Certified Web Developer
January 1, 2006 - August 28, 2025Sun Certified Web Component Developer
January 1, 2008 - August 28, 2025Oracle Certified Professional, Java EE Business Component Developer
January 1, 2012 - August 28, 2025Oracle Certified Expert, Java EE 6 Java Persistence API Developer
January 1, 2012 - August 28, 2025Oracle Certified Expert, Java EE 6 Web Services Developer
January 1, 2013 - August 28, 2025Neo4j Certified Professional
January 1, 2017 - August 28, 2025Data Engineering Foundations, National Association of State Boards of Accountancy (NASBA)
January 1, 2025 - August 28, 2025Oracle Certified Professional — Java EE Business Component Developer
January 1, 2012 - January 1, 0000Oracle Certified Expert — Java EE Java Persistence API Developer
January 1, 2012 - January 1, 0000Oracle Certified Expert — Java EE Web Services Developer
January 1, 2013 - January 1, 0000Sun Certified Java Programmer
January 1, 2000 - January 1, 0000Sun Certified Web Component Developer
January 1, 2008 - January 1, 0000Neo4j Certified Professional
January 1, 2017 - January 1, 0000Data Engineering Foundations — NASBA
January 1, 2025 - January 1, 0000Educative Data Science certificate
January 1, 0000 - January 1, 0000IBM Certified Visual Basic Programmer
January 1, 1999 - January 1, 0000Brainbench Certified Web Developer
January 1, 2006 - January 1, 0000Oracle Certified Professional — Java EE Business Component Developer
January 1, 2012 - July 30, 2026Oracle Certified Expert — Java EE Java Persistence API Developer
January 1, 2012 - July 30, 2026Oracle Certified Expert — Java EE Web Services Developer
January 1, 2013 - July 30, 2026Sun Certified Java Programmer
January 1, 2000 - July 30, 2026Sun Certified Web Component Developer
January 1, 2008 - July 30, 2026Neo4j Certified Professional
January 1, 2017 - July 30, 2026Data Engineering Foundations — NASBA
January 1, 2025 - July 30, 2026Educative Data Science certificate
January 11, 2030 - July 30, 2026IBM Certified Visual Basic Programmer
January 1, 1999 - July 30, 2026Brainbench Certified Web Developer
January 1, 2006 - July 30, 2026Industry Experience
Software & Internet, Financial Services, Energy & Utilities, Professional Services, Computers & Electronics, Gaming, Education, Media & Entertainment
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Beginner
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