2024 - today: Resolved critical bugs

Role: Freelance Software Engineer

Customer: BMW GROUP

Tasks:

• Resolved critical bugs in the vehicle booking calendar system using Angular, resulting in a 40% reduction in booking errors and improved system reliability.
• Implemented 6 new API services with complete logic and data mapping using Java and Spring Boot, introducing role-based access management with two roles, which enhanced data accuracy and improved application security.
• Managed deployments in pre-live and live environments for 6 months, executing updates at least twice a week using BMW Group?s cloud solution. Improved deployment scripts and processes, resolving critical failures and reducing deployment issues.
• Enhanced stability of two legacy backend classes by writing unit tests using JUnit, which reduced the need for manual testing and improved code reliability.
• Documented detailed deployment steps and procedures for production and configuration migrations in Confluence, enhancing deployment accuracy and consistency, and reducing deployment errors.
• Removed deprecated NPM packages and unified the date library by replacing Moment.js with date-fns, improving code maintainability and reducing bundle size by 15%.

Skills:

Javascript / typescript, Angular v14/ v 15/ v17, Spring Boot, Java 11 , java 17, CI/CD, Github actions, Oracle, bash scripting, Node, Junit, MySQL, NPM, VAADIN, Oauth 3, keylock

2022 - today: Developement AWS CDK projects

Role: Senior Software Engineer

Customer: TAXDOO

Tasks:

• Developed AWS CDK projects using Java to define serverless infrastructure, including AWS Lambda functions, API Gateway, MySQL tables, S3 buckets, CloudWatch monitoring, and clusters, resulting in improved scalability, efficient deployment.
• Implemented infrastructure as code (IaC) principles to manage and version AWS CDK code using Git, enabling easier tracking of contributions, quicker deployments, and efficient use of AWS CloudFront..
• Utilized S3 to manage billing and invoicing files and implemented scheduled jobs for recurring payment reminders, improving file management efficiency and reducing overdue payments by 60%.
• Developed features and components using Kotlin and Dagger to migrate clients from third-party services to our system, reducing dependency on external platforms and improving integration efficiency by 40%.
• Drafted software architecture and designed the concept for a payment reminder management system, documenting all UML diagrams to align the team on technical implementation, resulting in a two pair programming session every week,reduction in development time and improved team collaboration..
• Upgraded NPM packages and removed deprecated libraries in the frontend project and AWS CDK framework, improving project stability and reducing security vulnerabilities..

Skills:

AWS CDK, Java 6 Kotlin, reactJs, Javascript / typescript , ReactJs, aws cognito, Go , Java 11 , java 17 , CI/CD, Gitlab CI/CD , Mysql, Node, Junit, MySQL, NPM,

Oauth, integration tests , unit tests, nodeJs

2021 - 2022: Developement backend services

Role: Fullstack Software Engineer

Customer: Gehalt.de/stepstone

Tasks:

• Developed a responsive user interface using React.js and Thymeleaf for internal applications, and integrated with external Elasticsearch, enhancing user experience and improving search for job and matching by 60%.
• Developed backend services using Java and Kotlin to handle business logic and data processing, resulting in a quicker indexation of data and increase in processing efficiency.
• Collaborated with UX designers to enhance the overall user experience of the internal tool website, leading to a 25% increase in user satisfaction and a 20% reduction in navigation errors.
• Enhanced the on-call team process by implementing a new alert service and automated SMS notifications, which increased interaction and achieved a 1-hour response time to incidents.

Skills:

VAADIN, Javascript / typescript , Spring Boot , Java 11 , java 17 , CI/CD, Github actions, Junit, MySQL, NPM, VAADIN, Oauth 3, keylock, AWS SNS, jenkins, docker, SonarQube

2017 - 2021: Migration applications

Role: Software Engineer

Customer: FREE NOW / Mytaxi

Tasks:

• Developed backend services using Java and Kotlin to manage business logic, CRUD operations, and CI/CD workflows, resulting in streamlined development processes and a 30% increase in deployment efficiency.
• Collaborated with cross-functional teams to develop a frontend library and design system, standardizing UI components and enhancing development process cross all the frontend teams..
• Migrated applications from Angular to React.js, improving performance, maintainability, and developer productivity by 50%.
• Deployed applications and services to AWS and migrated them to Kubernetes, enhancing scalability, reducing deployment times by 40%, and optimizing resource management.
• Implemented RESTful APIs and secured them with OAuth2 for seamless communication between frontend tools and backend services, enhancing security and ensuring reliable data exchange.

Skills:

Javascript / typescript , ReactJs, aws cognito, Go , Java 11 , java 17 , kotlin, react-testing-library, testcafé, Selenium, CI/CD, Mysql, Node, Junit, MySQL, NPM, Oauth, integration tests , unit tests, nodeJs, ECS, AWS, EC2, ELK, graphana, php, Android, React Js / Spring boot

2017 - 2017: Implementation end-to-end (e2e) testing

Role: Software Developer

Customer: FASHION CLOUD

Tasks:

• Architected and developed robust, scalable, and efficient solutions for a B2B website using the MEAN stack.
• Utilized MongoDB as the NoSQL database to store and manage business data, enhancing data retrieval speed by 40% and improving data management flexibility.
• Developed server-side application logic and RESTful APIs using Express.js and Node.js, resulting in a 35% increase in backend performance and faster API response times.
• Implemented end-to-end (e2e) testing for the frontend using the Protractor framework, increasing test coverage by 40%.

Skills:

Javascript / typescript , Angular, NoSQL, aws cognito, Protractor, SeleniumNode, Jest, NPM, E2E test , unit tests, nodeJs, Lambda, AWS