freiberufler Senior Java Developer / Database Developer auf freelance.de

Senior Java Developer / Database Developer

zuletzt online vor 3 Tagen
  • 90‐120€/Stunde
  • Harburg
  • auf Anfrage
  • de  |  pl  |  en
  • 24.09.2024

Kurzvorstellung

As a seasoned Senior Developer and Architect based in Hamburg, I bring over 10 years of experience in Java and Oracle technologies. I specialize in crafting customized software solutions, guiding clients from initial concept.

Qualifikationen

  • Amazon Web Services (AWS)3 J.
  • C#1 J.
  • Datenbankentwicklung
  • Java (allg.)3 J.
  • Jira
  • Oracle-Anwendungen
  • Oracle E-Business
  • PL/SQL2 J.
  • Python2 J.
  • Software Architecture
  • SQL1 J.
  • Typescript2 J.
  • Workflows
  • XML1 J.

Projekt‐ & Berufserfahrung

Cloud Architect / Lead Developer / Coach
Mercedes Benz, München
1/2023 – offen (1 Jahr, 11 Monate)
Automobilindustrie
Tätigkeitszeitraum

1/2023 – offen

Tätigkeitsbeschreibung

Developed a generic platform in AWS for testing Electronic Control Units (ECUs) of various types, focusing on quality assurance and reducing intensive hardware-specific testing.

Challenges and Solutions:
- Challenge: Creating a robust and scalable platform for ECU testing to improve quality assurance and minimize hardware-specific tests.
- Solution: Designed the foundational architecture in AWS and developed multiple backend services using a microservice architecture, primarily in Python. Developed core libraries, such as the OAuth token flow, to support backend and frontend integrations. The platform underwent a security audit and successfully passed.

Eingesetzte Qualifikationen

Amazon Web Services (AWS), C#, Python, Typescript

AWS Trainer / Coach
Academic Work Germany GmbH, Hamburg
9/2022 – 10/2022 (2 Monate)
Hochschulen und Forschungseinrichtungen
Tätigkeitszeitraum

9/2022 – 10/2022

Tätigkeitsbeschreibung

Planned and conducted a five-week AWS training course to prepare 16 consultants for AWS certification.

Challenges and Solutions:
- Challenge: Effectively conveying complex AWS concepts within a limited time.
- Solution: Developed comprehensive curriculum with theoretical and practical components, including mini-projects.

Eingesetzte Qualifikationen

Git, Python, Amazon Web Services (AWS)

Backend Developer / DevOps
VTG Rail Europe GmbH, Hamburg
7/2022 – 12/2022 (6 Monate)
Versorgungswirtschaft
Tätigkeitszeitraum

7/2022 – 12/2022

Tätigkeitsbeschreibung

Provided consulting and development services for the maintenance and further development of the traigo.com platform.

Challenges and Solutions:
- Challenge: Expanding platform functionalities and ensuring operational stability in an AWS environment.
- Solution: Implemented customer use cases with IoT and serverless approaches, designed APIs, and improved infrastructure provisioning with Infrastructure as Code.

Eingesetzte Qualifikationen

Postgresql, Docker, Git, Gradle, Java (allg.), Kotlin, Spring Framework, Amazon Web Services (AWS)

Software Architect / DevOps / Fullstack
Media-Saturn IT Services GmbH, Ingolstadt
12/2021 – 7/2022 (8 Monate)
Konsumgüterindustrie
Tätigkeitszeitraum

12/2021 – 7/2022

Tätigkeitsbeschreibung

Conceptualized and implemented a master data application for processing contracts and purchasing conditions in a GCP cloud environment.

Challenges and Solutions:
- Challenge: Integrating multiple systems and ensuring data consistency.
- Solution: Developed a single point of truth API and refactored interfaces to REST endpoints.

Eingesetzte Qualifikationen

Postgresql, Docker, Git, Gradle, Kotlin, Typescript, Google Cloud, Kubernetes

Software Architect / Software Developer
BMW Group, Munich
5/2021 – 12/2021 (8 Monate)
Automobilindustrie
Tätigkeitszeitraum

5/2021 – 12/2021

Tätigkeitsbeschreibung

Enhanced global backend microservices for the My BMW App, optimizing service mesh architecture in AWS.

Challenges and Solutions:
- Challenge: Improving the scalability and efficiency of backend services.
- Solution: Developed and implemented technical concepts, optimized the service mesh architecture, and conducted deployments in EMEA, US, and China.

Eingesetzte Qualifikationen

Postgresql, Java (allg.), Jenkins, Amazon Web Services (AWS), Kubernetes

Integration Architect / Software Developer
CHEFS CULINAR GmbH & Co. KG, Hamburg
2/2021 – 5/2021 (4 Monate)
Gastronomie
Tätigkeitszeitraum

2/2021 – 5/2021

Tätigkeitsbeschreibung

Developed and implemented a master data integration for a CRM system (Aurea CRM) and SAP.

Challenges and Solutions:
- Challenge: Ensuring data consistency and synchronization between CRM and SAP systems.
- Solution: Built a change-data-capture logic and implemented bidirectional data synchronization using Talend.

Eingesetzte Qualifikationen

Enterprise Service Bus, Apache Maven, Subversion, Git, Java (allg.), Jenkins, PL/SQL, XML, XSLT (XSL Transformation)

Integration Architect / Software Developer
CHEFS CULINAR GmbH & Co. KG, Hamburg
4/2020 – 5/2021 (1 Jahr, 2 Monate)
Gastronomie
Tätigkeitszeitraum

4/2020 – 5/2021

Tätigkeitsbeschreibung

Developed integration for master and transactional data during SAP implementation, integrating an existing ERP system (Adabas) into SAP.

Challenges and Solutions:
- Challenge: Maintaining data integrity and seamless integration with SAP.
- Solution: Developed a REST interface and implemented change-data-capture logic.

Eingesetzte Qualifikationen

Adabas, SQL, Teradata Sql, Oracle Application Express, Enterprise Service Bus, Apache Maven, Subversion, Git, Java (allg.), Jenkins, PL/SQL, XSLT (XSL Transformation)

System Analyst / Software Architect
DERMALOG Identification Systems GmbH, Hamburg
1/2020 – 3/2020 (3 Monate)
Innere und Äußere Sicherheit
Tätigkeitszeitraum

1/2020 – 3/2020

Tätigkeitsbeschreibung

Developed a public government interface for biometric verification, integrating existing processes and orchestrations.

Challenges and Solutions:
- Challenge: Ensuring secure and efficient biometric data processing.
- Solution: Developed a web-based interface and defined generic data models for the public API.

Eingesetzte Qualifikationen

Git, Java (allg.), Oracle Application Express, Oracle Database, Spring Framework, SQL, XML, XSD (XML Schema Definition), XSLT (XSL Transformation)

Cloud Architect / Software Developer
EDEKA DIGITAL GmbH, Hamburg
1/2020 – 3/2020 (3 Monate)
IT & Entwicklung
Tätigkeitszeitraum

1/2020 – 3/2020

Tätigkeitsbeschreibung

Developed a serverless microservice for market search on edeka.de and managed build and deployment pipelines in AWS.

Challenges and Solutions:
- Challenge: Designing a scalable and efficient serverless solution.
- Solution: Implemented AWS Lambda and integrated the solution into the existing microservice landscape.

Eingesetzte Qualifikationen

Postgresql, Typescript, Amazon Web Services (AWS)

System Analyst / Software Developer
DERMALOG Identification Systems GmbH, Hamburg
12/2018 – 12/2019 (1 Jahr, 1 Monat)
Innere und Äußere Sicherheit
Tätigkeitszeitraum

12/2018 – 12/2019

Tätigkeitsbeschreibung

Refactored and optimized a multi-layered application for processing biometric data and providing state documents.

Challenges and Solutions:
- Challenge: Enhancing performance and scalability of a critical application.
- Solution: Refactored the system and implemented technical measures to increase throughput.

Eingesetzte Qualifikationen

Oracle Database, SQL, Oracle Application Express, Bash Shell, Git, Java (allg.), PL/SQL, Spring Framework, SQL*Plus, XML, XSD (XML Schema Definition)

Java Developer / Talend Developer
Veolia Umweltservice, Hamburg
11/2018 – 11/2018 (1 Monat)
Dienstleistungsbranche
Tätigkeitszeitraum

11/2018 – 11/2018

Tätigkeitsbeschreibung

Developed ETL processes for a Data Lake (DWH) for unified company-wide reporting.

Challenges and Solutions:
- Challenge: Integrating various data sources into a unified reporting system.
- Solution: Implemented ETL processes and a change-data-capture mechanism.

Eingesetzte Qualifikationen

Big Data, Oracle Database, Enterprise Service Bus, PL/SQL, Google Cloud, Amazon Web Services (AWS)

Ausbildung

Diplom Wirtschaftsinformatik
Diplom
2011
Hamburg

Über mich

As a seasoned Senior Developer and Architect based in Hamburg, I bring over 10 years of experience in Java and Oracle technologies. I specialize in crafting customized software solutions, guiding clients from initial concept and planning through to successful deployment.

My partners and customers perceive me as a highly motivated team-player who tries to get the best of their software assets. Not only developing but also consulting in how things can be improved for their business units and end-users with regard to time and budget. My tool-set consists of world-wide established technologies, like Oracle and Java, and highly scalable cloud services (PaaS, FaaS, DaaS, etc.) from AWS and GCP and finally the spirit to deliver quality at its best.

Weitere Kenntnisse

Cloud
AWS Lambda, AWS Elastic Beanstalk, AWS EC2, AWS DMS, AWS RDS, AWS SNS, AWS SQS, AWS CloudWatch, AWS DynamoDB, AWS API Gateway, AWS Dev Tools (CodeCommit, CodeStar, CodeDeploy, CodePipline), GCP App Engine, GCP BigQuery, GCP Datastudio

Enterprise Systems
Oracle Enterprise Business Suite (EBS)

Database Development
Oracle PL/SQL, Oracle SQL, ETL Prozesse, Critical Systems, MySQL

Java / JEE
Spring-Framework, Apache Camel, Apache Karaf, REST, JPA (Hibernate), Eclipse RCP, Talend DI, Talend ESB

DevOps (Dev meets Ops and vice versa)
Maven, Jankins, Docker, SVN, Git, Jira

IDE's
Eclipse, IntelliJ IDEA, RStudio, SQL Developer

Vorgehensmodelle
Scrum, Kanban

Persönliche Daten

Sprache
  • Deutsch (Muttersprache)
  • Polnisch (Muttersprache)
  • Englisch (Fließend)
Reisebereitschaft
auf Anfrage
Arbeitserlaubnis
  • Europäische Union
Profilaufrufe
5336
Alter
40
Berufserfahrung
16 Jahre und 10 Monate (seit 01/2008)
Projektleitung
2 Jahre

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