Self-Service Payment Portal
Lowell had already implemented an online payment option via the consumer portal. However, since the registration process for the portal was complex and involved sending a letter, management wanted straightforward solutions for paying claims directly online. Within the project, several options were developed and implemented.
- Designing solutions together with the managing director
- Implementation of three concepts (Self-Service Payment Portal with postal code, payment link sent in the welcome letter, ad-hoc payment link for callers)
- Monitoring of collected payments
- Privacy-compliant design of the Self-Service Payment Portal
cLean – Debt Collection Software
With the cLean project, Lowell pursued the development of a unified debt collection software for all group companies. All claims of the DACH organization were to be processed as automatically as possible in a highly available system. A key focus was determining the possible scalability of the system at certain times when large volumes of claims had to be imported. C# was the primary programming language, but individual services were implemented in Kotlin and Go.
- Architecture of the microservices system
- Defining service boundaries along business domain lines (DDD)
- Partitioning data into aggregates
- Concept and design of a case reference number readable by both humans and machines
- Concept for an immutable accounting system using Event Sourcing
- Concept and implementation of the accounting component in compliance with business rules
- Research into settlement logic in Germany and Austria
- Implementation of business logic
- Realization of search queries across distributed systems (separate service using CQRS)
- Cross-team coaching, training, and support
Central File Service
Lowell processes many documents — scanned letters, legal documents, evidence of claims, and files from consumers. The goal of the project was to provide a central file service capable of storing and serving large volumes of unstructured documents in an audit-proof manner.
- Concept and implementation of the file service, including deciding how to store metadata
- Design of the gRPC API
- Upload and download functionality in the gateway to the consumer portal
- Extension of the file service with MIME type support (required for downloads)
API-First
Lowell follows an API-First strategy. The goal was to make the API available to external processes as well. To this end, a central API was provided fully automatically and used by all services. The API is subject to strict guidelines regarding design and backwards and/or forwards compatibility depending on the use case.
- Concept and creation of a central API-First repository based on Protobuf
- Automated generation of release and pre-release versions for multiple programming languages to optimize development speed
- Concept for API versioning
- Creating APIs
- Documentation of the API
- Reviewing APIs with a primary focus on clarity, documentation, and breaking changes
Migration of an On-Premise Kubernetes Cluster to Azure Cloud
Initially, services were operated in an on-premise Kubernetes cluster. The goal of the project was to migrate all services to Azure Cloud. Additionally, technologies and cloud services were evaluated, utility classes and templates were created for future development, and a CI/CD pipeline was established.
- Selection of cloud services to be used in coordination with the architect
- Agreements on future autonomy of development teams
- Review of existing code and resulting best practices
- Documentation of the Transaction Outbox Pattern, idempotency, aggregates, and other useful microservice patterns
- Utility classes for sending and receiving Protobuf business events
- Creation of the CI part of the CI/CD pipeline
- Evaluation and implementation of Azure Serverless
- Setting up infrastructure using Infrastructure as Code (IaC)
- Liveness check / readiness check for services in Kubernetes
- Creation of cron jobs in Kubernetes
- Creation of C# templates for building new services