Claudiu D.

Claudiu D.

Senior Java Developer

Romania
Trusted member since 2025
23 years of experience

He has expertise in REST API design, Kafka integration, and containerized deployments using Docker and Kubernetes, combining deep architectural knowledge with practical, hands-on development.

Throughout his career, Claudiu has worked across finance, telecom, and cybersecurity industries, contributing to full SDLC projects within distributed teams and employing Agile and RUP methodologies. He also brings extensive experience in CI/CD, automated testing, and mentoring, supporting the growth of engineering teams while ensuring high-quality software delivery.

Main expertise

JavaJava23 years
SQLSQL15 years
Spring BootSpring Boot10 years
MicroservicesMicroservices10 years
REST APIREST API10 years

Experience17

Senior Java Consultant

Luxoft Romania (Client: Finastra)
Financial Technology (FinTech)
May 2024 - Mar 2025 · 10m

Luxoft is a global digital strategy and software engineering company delivering bespoke solutions to clients across financial services, automotive, and telecom industries.

  • Led the migration of Finastra’s Pegasus platform from Flink and Micronaut to a modern Spring Boot–based architecture.
  • Refactored legacy modules into clean, modular Java 17 codebases, improving maintainability and reducing technical debt.
  • Streamlined CI/CD pipelines using Maven and Sonar, enforcing code quality and automated static analysis.
  • Ensured data consistency and performance through extensive regression testing and API refactoring.
  • Collaborated closely with DevOps to optimize build and deployment efficiency in distributed environments.
JavaJava
Spring BootSpring Boot
MavenMaven
GitGit
SonarQubeSonarQube
Apache FlinkApache Flink

Senior Java Consultant

Orion Romania (Client: Qualcomm)
Telecommunications
Apr 2023 - Apr 2024 · 1y

Orion Romania delivers advanced software engineering services to global clients, including telecommunications and IoT enterprises.

  • Enhanced backend features for Qualcomm’s Edgewise RAN Service Automation Platform, enabling smarter cloud-based 5G orchestration.
  • Developed and modularized services during the transition to a microservices architecture, improving scalability.
  • Provided Level 3 support and resolved complex backend issues to ensure uptime and operational reliability.
  • Implemented asynchronous communication using Kafka and ActiveMQ, increasing processing throughput.
  • Containerized applications with Docker and Helm charts for seamless Kubernetes deployments.
MySQLMySQL
MongoDBMongoDB
DockerDocker
JavaJava
Apache KafkaApache Kafka
3+
NEXTLEVELTEC

Java Developer

NEXTLEVELTEC
Information Technology (IT) and Services
Jan 2023 · 3y 9m

NEXTLEVELTEC is an IT consultancy specializing in delivering enterprise-grade software solutions and digital transformation projects for clients across multiple industries. The company provides technical expertise in backend systems, cloud architectures, and scalable microservice deployments.

  • Served as a senior Java consultant across several client projects, supporting the design, implementation, and optimization of enterprise applications.
  • Developed proof-of-concept (POC) solutions to validate new architectural approaches and technology integrations for client systems.
  • Built and maintained microservices using Spring Boot and Apache Kafka, ensuring scalability and reliability.
  • Implemented RESTful APIs and supported CI/CD workflows to streamline integration between distributed systems.
  • Participated in maintenance and feature enhancement tasks, improving performance and stability in production environments.
  • Collaborated with cross-functional teams to ensure best practices in code quality, documentation, and DevOps alignment using Kubernetes.
JavaJava
MicroservicesMicroservices
Apache KafkaApache Kafka
Spring BootSpring Boot
KubernetesKubernetes
REST APIREST API

Senior Java Consultant / Team Lead

HCL Romania (Client: HP Inc.)
Information Technology (IT) and Services
Jun 2022 - Mar 2023 · 9m

HCL is a global technology company providing IT and engineering services across industries including manufacturing, banking, and hardware.

  • Designed and implemented backend features for HP’s enterprise printer management platform (HPI-HpOne).
  • Led a 5-person developer team through the entire SDLC, ensuring technical alignment and timely delivery.
  • Deployed services in AWS and integrated S3 and Lambda for scalable data processing.
  • Performed code reviews, optimized microservices performance, and guided developers on best practices.
  • Coordinated with QA and DevOps to streamline CI/CD and reduce deployment errors.
MongoDBMongoDB
DockerDocker
JavaJava
Spring BootSpring Boot
MavenMaven
4+

Senior Java Consultant

Orion Inc. (Client: Cybereason)
Cybersecurity
Jan 2022 - May 2022 · 4m

Cybereason is a cybersecurity firm offering endpoint protection and threat detection platforms for global enterprises.

  • Developed a Proof of Concept for the User Management Service, centralizing user creation and role assignment.

  • Implemented REST APIs with Spring Boot and built a Vaadin-based admin interface.

  • Designed modular backend architecture to ensure easy scalability and integration with existing systems.

  • Automated testing and deployment workflows with Jenkins and Docker.

JavaJava
JenkinsJenkins
Spring BootSpring Boot
MavenMaven
GitGit
VaadinVaadin

Senior Java Consultant

Atos (Client: National Bank of Belgium)
Banking and Finance
Mar 2021 - Dec 2021 · 9m

Atos is a global IT services company providing digital transformation and enterprise software solutions.

  • Maintained and extended financial data submission systems for the National Bank of Belgium.

  • Implemented new business rules in Drools and automated document ingestion using Spring Batch.

  • Delivered enhancements and bug fixes within tight regulatory timelines.

  • Supported the migration of services to Kubernetes for improved scalability.

DockerDocker
JavaJava
JenkinsJenkins
Spring BootSpring Boot
SpringSpring
3+
Evowise

Senior Java Developer

Evowise
Jan 2020 - Feb 2021 · 1y 1m

Evowise is a global software and marketing technology company providing cloud-based tools for communication and campaign automation.

  • Designed a near-real-time event processing platform using Apache Flink Stateful Functions and Druid.

  • Built management dashboards with Vaadin and integrated Redis caching for performance.

  • Led the implementation of core backend modules and API integrations.

  • Improved system responsiveness through async I/O and optimized event pipelines.

MongoDBMongoDB
DockerDocker
JavaJava
JenkinsJenkins
MavenMaven
2+

Senior Java Developer / Application Designer

Regulaition Inc. (Client: Private Bank)
Banking and Finance
Jan 2019 - Dec 2020 · 1y 11m

Regulaition Inc. develops compliance and regulatory software for banking and fintech organizations.

  • Co-designed architecture for a regulatory compliance platform, enabling users to identify necessary licenses and regulations.

  • Led a small development team throughout the implementation phase, ensuring code quality and delivery timelines.

  • Developed core backend services using Spring Cloud, Drools, and JPA, deployed on Google Cloud.

  • Created and maintained CI/CD pipelines with Docker and Maven.

DockerDocker
JavaJava
MavenMaven
OracleOracle
Google CloudGoogle Cloud
Spring CloudSpring Cloud

Senior Java Consultant

All European Careers (Client: Eurostat)
Data Analytics
Feb 2018 - Dec 2018 · 10m

All European Careers is a consultancy providing IT services to European institutions and public agencies.

  • Maintained and enhanced SDMX-Tools, a platform used for standardized statistical data exchange among global institutions.

  • Improved system stability and data consistency across MySQL and Oracle databases.

  • Delivered bug fixes and enhancements according to Eurostat’s strict SLA requirements.

MySQLMySQL
JavaJava
SpringSpring
MavenMaven
HibernateHibernate
3+

Senior Java Consultant

VisionGate, Inc.
Healthcare
Aug 2017 - Jan 2018 · 5m

VisionGate is a biotechnology company developing 3D cell imaging solutions for early cancer detection.

  • Migrated legacy Cell-CT 3D imaging platform from Java 5/AWT to Java 8/JavaFX.

  • Introduced Maven and Jenkins CI/CD pipelines to modernize the build system.

  • Improved modularization and separation of concerns for cleaner, more maintainable codebases.

  • Mentored the internal team on modern Java and clean code practices.

JavaJava
JenkinsJenkins
MavenMaven
XMLXML
JAX

Senior Java Consultant

IBM Romania (Client: HomeCredit China)
Banking and Finance
Jan 2017 - Jul 2017 · 6m

IBM is a global technology leader offering consulting, software, and AI solutions.

  • Provided Java EE technical leadership to onboard a new development team for the HomeCredit China project.

  • Supported knowledge transfer and defined coding standards across teams in Romania and China.

  • Assisted in building scalable enterprise modules for credit management systems.

JavaJava
JenkinsJenkins
SpringSpring
MavenMaven
HibernateHibernate
3+

Senior Java Consultant

Trivadis S.A.
Information Technology (IT) and Services
Jan 2016 - Dec 2016 · 11m

Trivadis is a Swiss IT consultancy specializing in data, analytics, and application modernization.

  • Developed the ECAB insurance management platform, modernizing legacy applications.

  • Delivered the full dashboard module, including a custom chart component built on Vaadin Charts.

  • Improved UI/UX and backend efficiency for reporting modules.

  • Introduced Liquibase for version-controlled database migrations.

MySQLMySQL
JenkinsJenkins
Spring BootSpring Boot
MavenMaven
HibernateHibernate
2+

Senior Java Consultant

Trasys S.A. (Client: European Commission – DG DEVCO)
Government and Public Services
Jan 2015 - Dec 2015 · 11m

Trasys provides IT consultancy and systems integration for European institutions.

  • Re-implemented the DG DEVCO Audit platform, migrating from ColdFusion to Java EE.

  • Designed and implemented a complex business validation module using Drools.

  • Contributed to frontend integration with Kendo UI and Bootstrap.

  • Improved backend reliability and performance.

JavaJava
SpringSpring
MavenMaven
OracleOracle
GitGit

Technical Leader / Application Designer

X3.Net GmbH
Information Technology (IT) and Services
Jan 2012 - Dec 2014 · 2y 11m

X3.Net is a German software company building enterprise communication platforms and distributed systems.

  • Designed architecture and oversaw development for Appstack, a modular communication platform.

  • Acted as a liaison between client stakeholders and the development team.

  • Led system design with Spring, Camel, CXF, and ActiveMQ, ensuring scalability and interoperability.

  • Conducted code reviews, enforced best practices, and mentored developers.

MySQLMySQL
ElasticSearchElasticSearch
JavaJava
SpringSpring
MavenMaven
3+

Senior Java Developer / Technical Designer

IBM Italy
Information Technology (IT) and Services
Jan 2006 - Dec 2011 · 5y 11m

IBM Italy led the modernization of legacy ERP systems for clients across Europe.

  • Re-engineered ACG Vision4, transitioning from COBOL to Java-based ERP architecture.

  • Designed and maintained financial module components, improving reliability and maintainability.

  • Produced technical design documents for offshore teams in India and coordinated cross-country collaboration.

  • Developed Cognos reports and mentored new developers on Java methodologies.

  • Traveled to Bangalore to train and support the offshore development team.

JavaJava
HibernateHibernate
SQLSQL
EclipseEclipse
Struts 2Struts 2
2+

Java Developer / SQL Developer

Tri-Pen Travelmaster Romania
Travel and Tourism
May 2003 - Dec 2005 · 2y 7m

Tri-Pen Travelmaster offers corporate travel reporting platforms that integrate multiple data sources.

  • Developed the Credit Card Data Load module to parse and validate data feeds from suppliers.

  • Created stored procedures and SQL scripts for reporting and analytics.

  • Improved automation of data ingestion workflows.

  • Supported migration from flat-file systems to Oracle databases.

JavaJava
OracleOracle
XMLXML
Struts 2Struts 2

Java Developer

Finsiel Romania
Information Technology (IT) and Services
Jun 2001 - Apr 2003 · 1y 10m

Finsiel Romania specialized in enterprise application development for Italian government institutions.

  • Contributed to GISTA, a resource management system for Italy’s Department of Agriculture.

  • Developed and maintained core modules and UI components.

  • Participated in testing, debugging, and deployment of application updates.

JavaJava
OracleOracle
JUnitJUnit
XMLXML
Struts 2Struts 2

Engineering excellence

All Senior Java Developers who have applied to Proxify are scored from 0 to 300 on engineering excellence, one of the five parameters we evaluate. This score reflects engineering excellence only, based on interviews, take-home assignments, live coding sessions, and/or on-the-job performance reviews. The curve shows how all evaluated Senior Java Developers are distributed across that range, where our acceptance threshold for this parameter sits, and where Claudiu stands.

050100150200250300Engineering excellence scoreShare of engineersmedianmeanProxifyacceptancethreshold
Claudiu
Score 219 · Top 3% of engineers

Education

ICO
IT College of Bucharest University
Computer Science1998 - 2001

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