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Rolang Flavin Noumessing TsombengRF

Rolang Flavin Noumessing Tsombeng

Senior Java Developer

On-demand
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Rolang Flavin

Developer with successful experience in large-scale projects. I always work with rigor and meticulousness for a result that meets the set expectations. Thanks to my curiosity and analytical skills, I assimilate the objective to be achieved with seriousness and determination, while being able to transmit knowledge to the various stakeholders.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • EURONEXT
    Senior Java Developer
    September 2022 - February 2025 (2 years and 5 months)
    Paris, France
    Migration of the Italian stock exchange within the Euronext group. The task was to evolve EURONEXT applications to integrate new data and extend or modify existing functionalities.
     Optimization of system performance.
    Identification of high latency points through profiling (using VisualVM),
     Refactoring and optimization of code (Java and PLSQL) as needed.
    Result obtained among others: 60% reduction in file processing time.
    • Development of new features.
     Implementation of REST APIs
     Writing solution documentation to meet the needs defined in user stories,
     Development of new forms (backend Java/PLSQL, frontend in ActionScript/Adobe Flex),
     Development of new stored functions/procedures (PLSQL) on demand,
     Migration of programs from certain applications (LEGACY) from Java 7 to Java 17,
     Creation and updating of "Action Types" via SQL scripts.
    • Writing technical documentation.
    • Development of fixes for issues reported by users (BUGS and other incidents).
    • Unit tests with JUNIT.

    Technical Environment: Java 17, Spring Boot, Maven, Junit, PL/SQL, Oracle Database 19c, Tomcat, Gitlab, Jira, Jenkins, Docker, Kafka, Confluence.
    SQL/PLSQL Docker Apache Kafka Java Spring Boot Jenkins
  • Direction Générale des Impôts (DGI) du CAMEROUN
    Senior Java Developer
    February 2019 - August 2022 (3 years and 6 months)
    Implementation of a tax tele-payment platform
     Design and development of payment reconciliation and accounting modules.
    Parallelization of the consumption and processing of SYSTAC and SIGMA files (multithreading) from interbank clearing to account for payments through Java thread development.
     Implementation of stored procedures for calculating the distribution of collected taxes among different beneficiaries (Municipalities, FNE, State, Media, etc.).
     Implementation of the receipt issuance mechanism and making them available to taxpayers in a dematerialized format.
     Management of tax and duty payment accounting, transmission of payment data to the tax system.
     Development of user interfaces with Angular.
     Implementation of REST APIs
    • Unit tests with Junit.
    • Documentation writing.
    • Production deployment
    • Production support.

    Technical Environment: Java 8, Spring Boot, Angular, Maven, PL/SQL, Oracle 12c, Weblogic, JasperReport, Git, Linux REDHAT 7/8.
    Angular JasperReport Java Spring Boot
  • Société de recouvrement des Créances (SRC) du CAMEROUN
    Developer
    March 2016 - January 2019 (2 years and 10 months)
    Implementation of an integrated debt management system. Setting up an application based on the Odoo ERP to manage the SRC business (recovery and compensation). The objective is to standardize existing applications into a single system to facilitate information exchange.
    • Collaboration with functional teams to translate business needs into technical solutions.
    • Module development.
     Modification and integration of Odoo's native treasury module, which relies on Python,
     Development from scratch and integration of the recovery module (amicable or litigation)
     Migration of business data from old applications from Oracle databases to the PostgreSQL database.
     Production support.

    Technical Environment: Python, Odoo, Qweb, Xml, Bitbucket, Postgresql, PyCharm, Oracle Database, Oracle Apex, Talend.
    Python odoo

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Education

  • Oracle Database SQL Certified Expert
    2013
    Oracle Database SQL Certified Expert
  • AWS Certified Cloud Practitioner
    2024
    AWS Certified Cloud Practitioner

Skill set

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