SENIOR FULLSTACK MOBILE DEVELOPER

6/2022 – offen

Development of a mobile library (Android/IOS) of books, audiobooks and videos
• Backend design and development with Spring boot
• Design and development of the mobile application (Android / IOS) with Flutter
• Ubuntu Server management and administration
• Implementation of Semantic Search (Sentence Embedding) with a neural network model and a vector database
• Google and Apple authentication integration
Tools and Frameworks: Spring Boot, Flutter, Dart, Qdrant, Elasticsearch, Ubuntu Server, Nginx, Docker, Gitlab


The qualifications and skills utilized:

- Fullstack Mobile Development: Experience and proficiency in both frontend (mobile application development) and backend development.

- Spring Boot: Expertise in designing and developing backend services using the Spring Boot framework.

- Flutter and Dart: Proficiency in building cross-platform mobile applications for Android and iOS using Flutter and Dart programming language.

- Ubuntu Server Management: Skills in managing and administering Ubuntu Server, ensuring the stability and performance of the server infrastructure.

- Semantic Search Implementation: Knowledge and experience in implementing advanced search functionality using semantic search techniques, neural network models, and vector databases.

- Authentication Integration: Ability to integrate authentication mechanisms from Google and Apple into the mobile application for secure user authentication.

- Tools and Frameworks: Familiarity and proficiency with various tools and frameworks such as Qdrant, Elasticsearch, Nginx, Docker, and GitLab for development, deployment, and version control.

These qualifications collectively enabled the successful execution of the project, ensuring the development of a feature-rich mobile library application meeting the client's requirements and objectives.

Mobilfunknetze

5/2020 – 3/2022

Design and development of the Web and Mobile App process for remote account opening for individuals and e-KYC for customer advisors
• Design and development of the backend application based on Spring Cloud micro-services (Zuul, Eureka, Cloud Config)
• Development of the Android / iOS app using Flutter
• Integration of Visio calls based on WebRTC and Websocket technology
• Electronic payment integration using the CMI API
• Integration of biometric identification using the mobile SDK and Onfido API
• Dialogue with the bank’s Avaloq core backing for account creation
• Synchronization of prospect data with Pipdrive CRM via Rest API
• Managing user sessions using Keycloak and LDAP
• Strengthen IT security following the Pentest reports conducted by Dataprotect
• Integration of OTP authentication using SMS sending from the DIALY API
• Integration of the Mailchimp/Mandrill reminder email sending service
• Managing servers on the AWS cloud
Tools and Frameworks: Spring (Cloud, Data, Security, JPA) – Java 8 – Flutter – AWS – Maven – Webhooks – Agile Scrum – Gitlab


The qualifications and skills utilized in this project include:

- Fullstack Development: Experience and proficiency in both frontend (mobile and web application development) and backend development.

- Spring Framework: Expertise in designing and developing backend applications using various Spring components such as Spring Cloud, Spring Data, Spring Security, and Spring JPA.

- Java 8: Proficiency in Java programming language, particularly Java 8 features, for backend development.

- Flutter: Proficiency in building cross-platform mobile applications for Android and iOS using Flutter framework.

- AWS (Amazon Web Services): Experience in managing servers and deploying applications on the AWS cloud infrastructure.

- Microservices Architecture: Knowledge and experience in designing and implementing microservices architecture using components like Zuul, Eureka, and Cloud Config for scalability and flexibility.

- WebRTC and WebSocket: Experience in integrating real-time communication features using WebRTC and WebSocket technologies.

- API Integration: Experience in integrating third-party APIs such as CMI API, Onfido API, Pipdrive CRM API, DIALY API, and Mailchimp/Mandrill API for various functionalities including electronic payments, biometric identification, CRM data synchronization, OTP authentication, and email sending.

- Security Measures Implementation: Knowledge and experience in implementing security measures to strengthen IT security following Pentest reports, including user session management using Keycloak and LDAP.

- Agile Scrum Methodology: Experience working in Agile Scrum environments for project management and collaboration.

- GitLab: Proficiency in using GitLab for version control and collaboration.

These qualifications collectively enabled the successful execution of the project, ensuring the development of a robust and secure web and mobile application solution that meets the requirements of remote account opening and e-KYC processes while providing a seamless user experience for both individuals and customer advisors.

Mobilfunknetze

9/2018 – 12/2019

• Design and development of an e-commerce marketplace for industrial products
• Participation in workshops to develop specifications and user stories
• Development of Backend APIs using the Spring Boot Framework and Java 8
• Development of the ElasticSearch API to search for products and generate product selection and comparison filters
• Persistence of entities (Users, Products,) in the PostgreSQL database
Tools and Frameworks Spring boot – Java 8 – ElasticSearch 7.0 – Git – Bitbucket – Redmine

The qualifications and skills utilized in this project include:

- Fullstack Development: Experience and proficiency in both frontend and backend development, encompassing the design and development of an e-commerce marketplace for industrial products.

- Workshop Participation: Ability to actively participate in workshops aimed at developing specifications and user stories, ensuring clear understanding and alignment with project objectives.

- Spring Boot Framework: Expertise in designing and developing backend APIs using the Spring Boot framework, leveraging its capabilities for rapid development and deployment.

- Java 8: Proficiency in Java programming language, particularly Java 8 features, for backend development, ensuring efficient and robust code implementation.

- ElasticSearch 7.0: Experience in configuring and developing with ElasticSearch 7.0, specifically for implementing search functionalities to enable product search and generation of product selection and comparison filters.

- PostgreSQL Database: Knowledge and experience in designing and maintaining a PostgreSQL database for persistence of entities such as users and products, ensuring data integrity and efficient data retrieval.

- Version Control: Proficiency in using Git for version control, enabling collaborative development and tracking of changes throughout the project.

- Collaboration Tools: Experience with collaboration tools such as Bitbucket and Redmine for code repository management and project tracking, facilitating effective communication and project management.

These qualifications collectively enabled the successful design and development of the e-commerce marketplace for industrial products, ensuring the implementation of robust backend APIs, efficient search functionalities, and seamless user experience while adhering to project specifications and requirements.

Mobile Application Development