Denis was responsible for designing and implementing a new sourcing microservice in a hexagonal architecture based on Domain Driven Design patterns. He introduced state of the art development patterns and worked with other teams to harmonise APIs and Events between the business domains.

• The Techniker Krankenkasse is Germans largest public health insurance on the market.
• He did the Migration of an existing MongoDB Cluster to the newest Version while simplifying the existing setup and adding IaC patterns

Denis was part of the team developing several new microservices to support new data sources for the upcoming partner platform. Additional partners were being onboarded into the Otto environment. As such, new microservices and existing ones needed to be (re-)designed. [Name by request] took a leading role in the architecture design & implementation of the services. The goal was to integrate and recreate existing processes from a platform perspective. This included talking to platform stakeholders and developers of partner-facing systems providing the retailer data and integrating them into the existing AWS environment.

Denis took part in developing several new microservices deprecating an old legacy monolith. He took a leading role in architecture design and implementation.  This included talking to stakeholders, talking to developers of the backend system providing the raw data, working out as well as testing API's between the different system, implementing code for the services and making sure the services actually work as intended after going live as well as follow-up with both stakeholders and other development teams.

Denis was part of migrating from the prior infrastructure hosted at an external company, to the AWS. This meant moving around 30 microservices to the Amazon cloud solution. Apart from a pure migration, it also included optimizing the architecture, making use of formerly not available technologies such as the serverless lambdas and kinesis. The project meant taking on not only a full stack development role in terms of frontend and backend but also doing a lot as DevOps (setting up routing, user management, network peering, etc.). The Amazon infrastructure was built up from scratch.

[Name by request] came into the project as Android developer and helped deliver the necessary features for the app, while using his mobile development expertise in Android to further improve the quality of the product. To do so, [name by request] introduced a Test-Culture driven through automated Unit-Tests and UI-Tests, which were later included into the continuous integration system. He also consulted Star Finanz in the necessary approaches for building sufficient stress tests of the platform and helped to migrate the given code base to Kotlin.

[Name by request] also helped on various security related aspects, e.g. helping to implement state of the art key wrapping and security frameworks as well as authentication features, e.g. Android Fingerprint in combination of the key management.

Through [name by request] skills and expertise and his participation in the team, the project made the necessary progress and did not encounter any points to address after the pen & security tests.

[Name by request] helped delivering the necessary features, while using his web and mobile development expertise in the native Android and iOS platforms. While doing so, [name by request]  also introduced a Test-Culture driven through Unit-Tests and Component-Test, which were later included into the continuous integration by creating an automating testing setup.

Through [name by request] skills the first radio channel App could not only be released in the given timeframe but also the build process and the quality could be improved.

[Name by request] analyzed ongoing Database problems in the BI-Department at myDriver. He used his expertise to consult on a technical and organizational level. Architectural improvements were implemented by developing a state of the art one pager application using Angular JS, Bootstrap and using the existing Data-Warehouse.

Thanks to the work of [name by request] myDriver improved its Database and thus the BI performance by a multitude.

[Name by request] communicated with the different stakeholders from different departments, while analyzing and adapting the requirements for the application. After engineering the requirements, [name by request] evaluated the available technologies at Lufthansa Technik. His ability to understand complex processes made sure to fit the business aspect as well as the design of a supporting architecture. He defined a migration plan for existing data and a roadmap for the migration process.

The result was not only a data migration from over 500 users from the existing MS Access legacy system to a web driven LDAP integrated application, but also an improved standing of the IT in the involved departments. This led to a more open and positive exchange with IT and made [name by request] to a reliable contact for new IT requirements.

[Name by request] communicated with the customer as well as the different it-departments to get the corresponding data. For making a sufficient calculation model [name by request] used his experience on working in the manufacturing sector. He designed a two-phase calculation algorithm, which uses not only the workload of the given machines, but also the planned output and changes in the availability of workers (e.g. vacations).

As a result, the application enabled the department to make decisions based on real objective values and helped them to keep in line with their current business goals.

[Name by request] role in the project (as the mobile developer) was to develop a proof of concept app and analyze the technical possibilities and correspond with different stakeholders. In the later phase [name by request] pitched the resulted product to a board of chairmen of a clothing chain.

The result was a working prototype on Android and an established deal for an in house deployment of the given technology. Fewclicks created a spin-off startup Favendo, which currently expands its business in the USA.

[Name by request] helped with the research on influence of stockholders in the IT capabilities of TOP500 companies. He developed a custom software and extensive SQL Queries to calculate given formulas from scientific papers.

The tasks included extensive ETL-processes and aggregation of data. [Name by request] used his experience in optimizing complex algorithms and transforming data, to enable a visual validation of the hypothesis discussed in several papers.