Software Developer

Project name Fullstack Development Identity and Access Management Period 01.03.2024 – 31.12.2025 Company Hoffmann Engineering Services GmbH Roles Software Developer Activities and tasks Software development, Technical design of software architecture and design (considering functional/non-functional requirements), frontend and backend, refactorings, code reviews, unit tests, automated integration tests, end-to-end tests Description Global Identity Services (GIS) is the identity provider for the Digital Services Platform (DSP). GIS is responsible for authentication and authorization of end users and other DSP services by issuing security tokens. This also includes managing identities (e.g., user registration, password reset and change, user profiles), roles and permissions management, single sign-on (SSO) across DSP services, as well as management of OAuth resources and terms and conditions. Technologies Microsoft .NET 6/8/9 (C#), TypeScript, Java (JDK 17/21), Spring Boot 2/3, next.js 13/14/15, React 18/19, Azure DevOps, Azure Key Vault, Azure Kubernetes Service (AKS), Docker, Docker-Compose, Azure Container Registry (ACR), Azure Database for PostgreSQL 14 - Flexible Server, MongoDB Atlas 5/6/7, ELK Stack, Grafana, Entity Framework Core 6/8/9, IdentityServer 4, Strapi CMS 4/5, GraphQL, REST, Microservices, OAuth 2.0, OpenID Connect, Playwright, Slack, Microsoft Teams, SQL, LINQ, XML, JSON, YAML, OpenAPI/Swagger (Swashbuckle), HTML5, SCSS, Moq, FluentValidation, FluentAssertions, NUnit, AutoMapper, Polly.NET, Serilog, RabbitMQ, Jest, Multithreading, architecture and design patterns, UML, Clean Code Development, Continuous Integration, Continuous Delivery, Microsoft Visual Studio 2022, Microsoft Visual Studio Code, IntelliJ, Figma, SonarCloud, Jira, Confluence, Git, SCRUM Number of users - Special features Project language German and English

• The goal is to introduce DSL for Drillisch's fixed-line products so they can be offered under different brands if needed. In addition to product ordering, tariff changes and cancellations should also be possible. This is done, among other things, by integrating services from 1&1 AG as well as the SPRI and WBCI services. Structured data from Deutsche Telekom is batch imported to check DSL availability.
• Software development, technical design of software architecture and design (considering functional/non-functional requirements), frontend and backend, refactorings, code reviews, unit tests, automated integration tests, performance analysis and optimization.
• Technologies: Microsoft .NET 6 (C#), TypeScript, Angular 13, Angular Material, HTML5, SCSS, RxJS, Microsoft Visual Studio 2022, Microsoft Visual Studio Code, Visio 365, Microsoft Teams, SVN, SOA web services (SoapCore), REST, MSTest, Moq, architecture and design patterns, Clean Code Development, UML, certificates, Polly.NET, SharePoint 365, Jenkins, Continuous Integration, Continuous Delivery, SQL, MS SQL Server 2016, MySQL 5.7 + 8.0, SQL, LINQ, log4net, XML, JSON, Windows Server 2019, IIS 10, performance tools (EXPLAIN (databases), Visual Studio Performance Profiler), PowerShell, Confluence, OpenAPI/Swagger (Swashbuckle), SCRUM.

• GCCP (Global Communication and Control Platform) is a newly developed system consisting of CCTV (Closed Circuit Television) and PIS (Passenger Information System) to monitor critical infrastructures like production lines with cameras and sensors in control centers, or to display or announce information (current/next station, advertisements…) to passengers at train stations or airports, on trains or buses. Time series data (events) is captured, analyzed and stored by machines.
• Documentation (based on arc42) and further development of software architecture and design (considering functional/non-functional requirements), frontend and backend, evaluation of tools, frameworks and libraries, code reviews, concept reviews, software development, refactorings, unit tests, automated integration tests for four SCRUM teams (technical lead), planning and interaction at management level.
• Technologies: Microsoft .NET Core 3.1 (C#), Microsoft Visual Studio 2019, Microsoft Visual Studio Code, Microsoft Teams, Enterprise Architect, GitLab, gRPC, SignalR Core 3.1 (Streaming), ASP.NET Core 3.1, REST, Microservices, TypeScript, Vue.js 2, Vuetify, HTML5, CSS3 (SCSS), LINQ, NUnit, xUnit, Moq, Jest, Selenium, RxJS, XML, JSON, YAML, architecture and design patterns, Clean Code Development, UML, IdentityServer 4, OpenID Connect (OIDC), OAuth 2.0, JWT, certificates, Polly.NET, SharePoint 2019, Confluence, NGINX, RabbitMQ (Messaging), Docker, Docker-Compose, Kubernetes, Podman, Continuous Integration, Continuous Delivery, Graylog, Monitoring (InfluxDB, Prometheus), Grafana, HashiCorp Vault, Kestrel, Ubuntu Linux 18.04, WIBU Systems CodeMeter, Jira, SCRUM, PowerShell, OpenAPI/Swagger (Swashbuckle, NSwag), AutoMapper, Blazor Server.
• Special features: Project language mostly English.

• Design and implementation of microservices (REST) to synchronize flight and airport data from multiple instances of the Netline and Sabre systems, which were integrated via SOA web service and database.
• Software development, refactorings, code reviews, unit tests, automated integration tests, backend.
• Technologies: Microsoft .NET 4.6.1 (C#), Microsoft Visual Studio 2017, Visual Studio Team Services (VSTS), Git, ASP.NET Web API 2, WCF, SOA web services, REST, ADO.NET, MS SQL Server 2014, MSTest, XML, JSON, LINQ, Moq, Unity IoC, log4net, design patterns, clean code development, continuous integration, Slack, Confluence, certificates.
• Highlights: project language English, remote/home office.

• The DATEV Workplace is the central entry product for DATEV users, offering an overview of the firm or company and the ability to directly execute functions from the various DATEV applications or branch into them.
• Technical contact for 48 interface partners (plugin suppliers), performance analysis and optimization, software development, refactorings, concept validation (PoC/prototypes), code reviews, unit tests, automated UI tests, 3rd level support.
• Technologies: Microsoft .NET 4.5 (C#), Microsoft Visual Studio 2013/2015, Microsoft Team Foundation Server 2013/2015, Windows Forms, MSTest, XML, LINQ, multithreading, design patterns, clean code development, TDD, continuous integration, SCRUM, ReSharper, SonarQube, .NET Memory Profiler, WinDBG, DebugDiag, SpeedTrace, .NET Runtime Analyzer, DFL (DATEV Framework Library), SharePoint 2013.

• MODex2007 is a custom-built Identity Access Management system to manage roles, user and property data.
• Implementation of an application to synchronize Active Directory forests, export forests to XML and import them into Active Directory (backend).
• Technologies: VB.NET, Active Directory, LDAP, XML, Microsoft Visual Studio 2005, Microsoft Visual Source Safe 2005.
• Highlights: 50% of daily working time.

• Implementation of the final thesis for training as an IT Specialist in Application Development.