Implementation of a Time Tracking Software

The project involved reimplementing a time tracking software that, beyond basic time entries, includes additional purchasable modules for end customers.

The software architecture was designed to start as a monolith but be ready for migration to a microservices architecture if needed.

From defining and refining requirements, to frontend development, designing and implementing REST APIs in the backend, and testing both technical and business correctness, Lars took part in every phase of development.

Tasks

• Requirement analysis
• Software architecture planning
• API analysis & design
• Backend development
• Frontend development
• Code review
• QA and testing
• CI/CD

Technologies

• Java 17
• Spring Boot
• Spring MVC
• Spring Data
• Spring Cloud Streams
• Maven
• MySQL
• Angular, TypeScript
• HTML, CSS
• JavaScript
• Docker
• ELK stack
• RabbitMQ

Project 1: Reimplementation of network admin and documentation software with Angular. A tool for company-wide network admin and documentation needed better usability and maintainability. I built the UIs with Angular, created mockups with the client, and delivered them in weekly sprints. I also advised on UX and usability.

Tasks:

• Requirement analysis
• UI architecture
• Component design
• UI components with Angular
• UI/UX consulting
• Technical consulting

Technologies:

• Angular
• Jira

Project 2: Reimplementation of a crane configurator. The client wanted a tool where users enter three physical parameters, see suitable cranes, and refine parameters on the results page. It serves as a buying guide for cranes.

Tasks:

• Requirement analysis
• UI architecture
• Component design
• UI components with Angular
• UI/UX consulting
• Technical consulting

Technologies:

• Angular
• Jira

For a major German licensing and media company with about 330,000 media files, we replaced their file-server and network-share system in Windows Explorer. They had files in a folder hierarchy where each level was a file attribute.

Finding files was nearly impossible at that scale, and accidental moves or deletes were common. We designed a role-based rights system for different user views and actions. All file actions (delete, upload, rename) were logged for traceability.

New files are regularly synced to an existing media server that serves customers.

Tasks

• Requirement analysis
• System architecture
• IT architecture of apps
• Web frontend with Angular, TypeScript
• Backend development
• QA and testing
• CI/CD (Git, Maven, Jenkins, Docker)
• Coordination with technical partners
• Jira

Technologies

• Java
• TypeScript
• Spring Boot
• Spring MVC
• Spring Data
• Spring Security
• Angular
• LDAP
• MySQL
• Jenkins
• Jira

In this project, Benedikt supported an international car rental provider in test management. He implemented and maintained tests and oversaw biweekly releases. Before each release, all user flows across the client’s portals were run via automated tests. He analyzed results, tracked failures, reported bugs, and coordinated fixes. He was also part of the release management team, giving the final go-ahead and supporting the rollout.

Tasks

• Design and implement automated tests
• Build a complex test environment replicating live systems with test data
• Virtualization with Docker
• Run and evaluate tests
• Coordinate bug fixes

Technologies

• Java
• PHP
• JavaScript
• Selenium
• Maven
• Docker

Project 1: Portal/Corporate Website with Liferay Portal. We built a web app as the company’s website and intranet. Employees log in to handle steps for onboarding e-commerce merchants. Merchants see tailored content and tools. Admins can edit pages via CMS.

Tasks:

• Build complex widgets editable via Liferay CMS
• Frontend portlet development
• Customer registration and login with token auth
• Multilingual support
• Admin portlet settings for language and email recipients
• Merchant-specific portlets

Technologies:

• Java EE
• Portlet 2.0
• JSF/PrimeFaces
• CDI
• Web services
• HTML
• Velocity
• JavaScript
• Liferay Portal

Project 2: Merchant Backend. We built a backend for merchants to manage transactions: check status, request payouts, and handle admin tasks.

Tasks:

• Account settings for merchants
• View current transactions and revenues
• Download invoices and payout reports
• Configure payment channels
• Display data by payment method

Technologies:

• Java EE
• Portlet 2.0
• JSF/PrimeFaces
• CDI
• Web services
• HTML
• Velocity
• JavaScript
• Liferay Portal

Project 3: BI with Saiku. We enabled strategic decisions by analyzing 32M+ transactions. Data was aggregated by currency, method, period, then extracted to a NoSQL store. We created a star schema for Saiku BI and integrated it with the portal.

Tasks:

• Integrate Saiku BI into the portal
• Add LDAP auth for Saiku
• Develop star schema for BI
• Load data into the star schema
• Enable SSO via Liferay
• Configure payment channel reports

Technologies:

• Spring
• Java EE
• OSGi
• JPA
• GlassFish/Payara
• CDI
• Web services
• LDAP
• Liferay Portal

Project 4: Payment Connector. We connected various payment providers and implemented interfaces for full payment flows. We also implemented processes for importing CSV booking entries and matching them with transactions. We built “Payment Pages” for customers to initiate payments.

Tasks:

• Connector for providers (PPro, Alipay, Novalnet)
• Create JSON models
• Send transactions to provider REST APIs
• Handle instant payment notifications
• Record transactions in the backend
• Track status changes
• Process refunds
• Import bookings from CSV
• Interface for webshop orders
• Connect merchant backend to payment backend
• Payment Pages for customers

Technologies:

• Java EE
• OSGi
• GlassFish/Payara
• JAXB
• Jersey 2/Jackson
• JAX-RS
• CDI