Kegyes David
Verified Expert in Engineering
Java Software Engineer and Developer
Satu Mare, Satu Mare County, Romania
Toptal member since March 3, 2025
David is an experienced Java software engineer and consultant specializing in back-end development with Java, Spring Boot, and scalable architecture. He also brings front-end expertise in React, JavaScript, and Node.js, enabling him to deliver end-to-end solutions. Known for his problem-solving skills, David excels in performance optimization and designing efficient, maintainable solutions that drive business success.
Portfolio
Experience
- Java - 11 years
- Jira - 10 years
- Complex Problem Solving - 10 years
- Spring Boot - 8 years
- Java Message Service (JMS) - 8 years
- Solution Design - 8 years
- Spring - 8 years
- Software Design - 7 years
Availability
Preferred Environment
Java, Spring Boot, Spring Integration, Cloud, SQL, Git, JavaScript, React, Node.js, Jira
The most amazing...
...achievement has been optimizing Garmin's B2B marketplace by integrating a caching layer, which reduced response times by 40% and enhanced platform performance.
Work Experience
Senior Java Software Engineer
Mediabrief
- Migrated a legacy Ruby monolith to a modern microservices architecture for a healthcare platform, improving system scalability, maintainability, and modularity.
- Designed and developed high-performance microservices using Java 21 and Spring Boot, ensuring optimal performance, seamless integration, and alignment with healthcare-specific requirements.
- Implemented a message-driven architecture with Google Pub/Sub, facilitating reliable, real-time communication between services and maintaining system integrity under high traffic loads.
- Managed microservices deployment on Google Cloud Platform (GCP), leveraging cloud-native tools to maximize reliability, scalability, and cost-efficiency while adhering to best practices.
Senior Java Software Engineer
Ropardo SRL
- Implemented new media and channel types with customizable rates, allowing flexible fee overrides and increasing profit margins by 80%. Conducted business analysis to ensure scalability and seamless integration with existing systems.
- Directed a team in migrating critical services to AWS, reducing database latency by 60% through read-only and read-write request segregation. Coordinated cross-team efforts to mitigate risks and ensure a seamless transition.
- Partnered with stakeholders to define migration requirements, optimize workloads, and ensure seamless cloud infrastructure integration with existing platforms, improving system scalability and resiliency.
- Revamped the bulk editing functionality for campaigns, ads, and targetings, enhancing the user experience by 90% through redesigned UI components and added flexibility in operational workflows.
- Collaborated with cross-functional teams to align technical improvements with business objectives, ensuring the delivery of impactful solutions that address client pain points.
- Conducted comprehensive code reviews and testing processes to maintain high-quality standards across the codebase, fostering a culture of technical excellence within the development team.
- Integrated Elasticsearch and Druid into the data pipeline, delivering rapid data aggregation and retrieval to support real-time analytics.
- Developed a comprehensive reporting feature for advertising metrics, allowing clients to analyze campaign performance and spending trends 80% more efficiently without compromising API response time.
Senior Java Software Engineer
P4B Group
- Migrated a monolithic application to a microservices architecture, cutting API response times by 60% and enhancing system modularity and maintainability.
- Enhanced the decision-making engine and rule management system, cutting processing times by 50% while improving the tracking and visibility of decision workflows.
- Refactored a simulation engine using advanced technologies, reducing client simulation response times by 80%—from 47 minutes to just three minutes—resulting in significant time savings and improved user experience.
Senior Software Engineer
Garmin
- Optimized Garmin's B2B marketplace by integrating a caching layer, reducing response times by 40% and enhancing platform performance.
- Designed scalable caching mechanisms to efficiently handle large datasets, ensuring quick data retrieval and minimizing database load.
- Conducted thorough system testing and performance tuning, ensuring a stable platform capable of handling high transaction volumes during peak periods.
Full-stack Java Developer
UNIQA Software Services
- Optimized findability and reachability by increasing agency discoverability by 70% with an interactive map and enhancing agent accessibility by 80% through an advanced search engine with filters for language, product type, and location.
- Accelerated claims processing by reducing claim resolution time by 30%, designing a dynamic online form that adapts to user input, streamlining data collection, and minimizing errors for faster, more accurate claim handling.
- Enhanced CMS efficiency by boosting landing page creation speed by 50% through the development of responsive, editable UI components, allowing marketing teams to build and customize pages independently.
Experience
Presentation Website
https://www.fundatiasfanton.roEducation
Bachelor's Degree in Computer Science
Sapientia Hungarian University of Transylvania - Târgu Mureș, Romania
Certifications
Oracle Certified Associate, Java SE 7 Programmer
Oracle
Skills
Libraries/APIs
Java Message Service (JMS), REST APIs, jQuery, Google Maps API, React, Quartz, Node.js
Tools
IntelliJ IDEA, Skype, Jira, Slack, GitHub, Apache Solr, Jspx, RabbitMQ, Kibana, Git, Confluence, ActiveMQ, JBoss Drools, Amazon Simple Queue Service (SQS), Apache Druid
Languages
Java, CSS, JavaScript, HTML, SQL, Java SE 7
Frameworks
Spring Boot, Spring, ICEfaces, Spring MVC, JSON Web Tokens (JWT), OAuth 2, Spring Integration, .NET, Spark, Spring Batch
Paradigms
Microservices, Scrum, Application Architecture, Agile Workflow, STOMP, App Development
Platforms
Visual Studio Code (VS Code), MacOS, Linux, Windows, Oracle, Kubernetes, Apache Kafka, Google Cloud Platform (GCP), Firebase, Heroku, Docker
Storage
MySQL, Database Caching, Redis, JBoss AS, Elasticsearch, MariaDB, Spring Data, JSON, HDFS, PostgreSQL, Spring Data JPA, Google Cloud Storage, Google Cloud SQL, PostgreSQL 10, Microsoft SQL Server
Other
Software Design, Solution Design, Complex Problem Solving, Solution Architecture, Scrumban, Architecture, Distributed Systems, Teams, Software Development, QA Testing, Enterprise Java Beans (EJB) 3, RESTFul APIs, Cloud Foundry, Gemfire, SOAP, YML, Okta, Artificial Intelligence (AI), Google Pub/Sub, Cloud, Oracle Associate
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