Csaba M.-Senior Java Backend Developer (Freelancer, 100% remote)
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Experience
Senior Java Backend Developer (Freelancer, 100% remote)
Unzer GmbH
- Developed a new, complex landing page for an AI-assisted Angular project using Cursor and Windsurf, reducing implementation time by 3-5x
- Built a greenfield Spring Boot backend system with RESTful APIs and PostgreSQL using AI assistance
- Turned Figma designs into responsive, pixel-perfect Angular web apps for all screen sizes using TypeScript and AI assistance
Senior Java Backend Developer (Hybrid)
payolution GmbH
- Designed and implemented a RESTful API module that automated manual Merchant Onboarding processes, improving efficiency by 300%
- Collaborated on breaking down a monolithic application, improving system modularity and maintainability
- Integrated SonarQube with GitHub code repositories, making a legacy codebase easier to maintain
- Integrated the new codebase with a message queuing system using Apache Kafka
- Optimized database queries, improving performance by 10-15x
- Participated in migrating monolithic software systems from on-premises infrastructure to AWS, including database migration (Oracle 19c to Amazon Aurora PostgreSQL/Amazon Oracle) and DevOps tasks
- Developed automated tests to verify platform integrity
- Provided an Ansible-based configuration management solution, enabling a smooth, database-agnostic migration to AWS Cloud
- Managed junior developers, improving code quality and team productivity
- Extended the project using Kotlin
- Improved source code quality by maintaining SonarQube quality gates
- Participated in technical decision-making for migrating a document management system to a cloud solution
- Provided a four-eyes-principle backend solution for financially relevant pages
- Collaborated with DevOps on platform fine-tuning, including performance and configuration distribution
Java Software Developer (core component team)
I-NEW Communicative Solutions GmbH
- Extended and integrated core components, implemented new features, and maintained existing code
- Handled bug reports and supported testers
- Participated in sessions to improve performance
Technical Project Leader
AdNovum Hungary Kft
- Helped upgrade, extend, and maintain the company's internal application for work time, project time, and budget price management, and took full responsibility for its technical content
- Managed the daily work of four developers, including quality oversight
- Developed the company's website using an Enterprise Content Management System (Magnolia CMS)
- Developed the Contract Management Tool module of Swiss banking software: updated the front-end UI (JSP), implemented frontend business logic and workflow (GWT), implemented backend business logic and workflow (Java), extended the persistence mechanism (Hibernate), and implemented scheduled operations and export/import functionality
Java Developer / Team Leader
Taninform Zrt.
- Coordinated collaboration between tester and developer groups
- Managed and actively contributed to the bug-fix team
- Developed and maintained project builder and deployment scripts, including DevOps tasks in Python on Linux
- Performed in-depth application diagnostics using the JProfiler profiler
- Participated in developing a greenfield project: an online school administration system
- Participated in implementing the software architecture for both the user interface and backend
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Banking and Finance, and Education.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and Project Management.
Summary
Proven Senior Java Backend Developer with extensive experience, currently working as a freelancer. Skilled in designing and maintaining backend systems, integrating cloud technologies, and delivering scalable solutions. Passionate about using AI-assisted development tools (Cursor AI, Windsurf AI) to speed up software delivery and maintain high code quality. Open to remote opportunities in dynamic, collaborative teams.
Skills
- Core Java 1.6, 1.8 (Expert)
- Typescript (Advanced)
- Sql (Expert)
- Pl/Pgsql (Advanced)
- Yaml (Advanced)
- Bash Scripting (Advanced)
- Kotlin (Intermediate)
- Python (Intermediate)
- Cursor Ai Code Editor (Advanced)
- Windsurf Ai (Cascade) Code Editor (Advanced)
- Spring Framework (Expert)
- Spring Boot 1.5, 2.X (Expert)
- Tomcat / Glassfish / Jboss (Expert)
- Git / Svn / Cvs (Expert)
- Oracle Database 11g-19c (Expert)
- Postgresql (Expert)
- Hibernate / Eclipselink (Expert)
- Wicket / Struts / Tapestry / Gwt (Advanced)
- Log4j / Logback (Advanced)
- Spring Batch / Quartz / Cron (Advanced)
- Apache Activemq / Apache Kafka (Advanced)
- Apache Camel (Intermediate)
- Liquibase (Advanced)
- Apache Maven / Ansible / Ant / Ivy (Advanced)
- Mockito / Junit (Advanced)
- Sonarqube (Advanced)
- Splunk (Advanced)
- Jira / Confluence / Bitbucket / Github (Advanced)
- Postman (Advanced)
- Mongodb (Intermediate)
- Docker / Podman (Advanced)
- Figma (Advanced)
- Strong Problem-Solving Skills
- Expert In Coding
- Extensive Technical Knowledge
- Effective Communication
- Leadership Experience
- Ability To Mentor
Languages
Education
Kecskemet College
Information Technology Engineer · Information Technology Profession · Kecskemét, Hungary
Certifications & licenses
OCAJP 7 Exam 1Z0-803 (SUN Certificate)
Oracle
Team Leader Training
Krauthammer
Statistics
Experience
Global experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
Csaba is based in Paralimni, Cyprus and prefers 100% remote projects.
Csaba speaks the following languages: Hungarian (Native), English (Advanced).
Csaba has at least 22 years of experience. During this time, Csaba has worked in at least 5 different roles and for 5 different companies. The average length of individual experience is 4 years and 5 months. Note that Csaba may not have shared all experience and actually has more experience.
Based on recent experience, Csaba would be well-suited for roles such as: Senior Java Backend Developer (Freelancer, 100% remote), Senior Java Backend Developer (Hybrid), Java Software Developer (core component team).
Csaba's most recent position is Senior Java Backend Developer (Freelancer, 100% remote) at Unzer GmbH.
In recent years, Csaba has worked for Unzer GmbH and payolution GmbH.
Csaba is most experienced in industries like Information Technology, Banking and Finance, and Education.
Csaba is most experienced in business areas like Information Technology, Product Development, and Project Management.
Csaba has recently worked in industries like Banking and Finance.
Csaba has recently worked in business areas like Information Technology and Product Development.
Csaba holds a Bachelor in Information Technology Profession from Kecskemet College.
Csaba has 3 certificates. These include: AWS Certified Cloud Practitioner, OCAJP 7 Exam 1Z0-803 (SUN Certificate), and Team Leader Training.
The availability of Csaba needs to be confirmed.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 14 Nov 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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