Freelancer profile translated to English.

Description

My area of expertise is the development of web applications. I have in-depth expertise in all relevant layers, from responsive frontend with modern HTML5 technologies to a lean microservice-based API and high-performance databases. I also have particular expertise in complex rule evaluations in the frontend (“click logic”). Furthermore, setting up automated build, test, and deployment pipelines is among my strengths.

In the frontend area, I am currently particularly interested in responsive web designs with a strong focus on mobile, touch-based end devices (tablets, smartphones). In conjunction with current HTML5 technologies such as Service Worker and IndexedDB, it is possible to realize applications that are in no way inferior to native ones in terms of functionality and user experience, but offer decisive advantages over them in terms of development and delivery speed.

I prefer to work in agile teams following the Scrum development process. As I am a certified Scrum Master (ScrumAlliance) myself, I am also happy to provide consulting if there are any uncertainties regarding this development method.

I am available for projects both remotely and on-site throughout the DACH region, or for a combination of both.

Languages

German
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Novartis
Tech Lead
PHARMACEUTICALS INDUSTRY
December 2023 - January 2026 (2 years and 1 month)
Basel, Switzerland
Further development of a platform for visualizing company data. Here I took on my project role again, which I already had from the past.

Furthermore, I worked on the new development of a platform for creating sales forecasts. This involved implementing a highly Excel-based workflow (forecasts were individually created with Excel, had different structures, files were manually passed around...) into a web-based platform.

Main reasons for the new tool
All forecast data centrally in one DB.
One tool / UI with a uniform structure.
Role and permission concept
Visually appealing presentation of forecast results

To facilitate the users' transition from the Excel workflow to the new application, a central requirement was that the user interface should have an Excel-like look and feel. To enable this, I evaluated various libraries, and in the end, the decision was made for Univer-Sheets.

My tasks
Creation of the frontend architecture
Lead development on the frontend component (Next.js application)
Functional design, conception of new features

Technologies
Univer Sheets
Next.js / React
AgGrid
Vitest
Hey-api openapi client with code generator
AgGrid Next.js Typescript Tech Lead React.js
RWE
Senior Fullstack Engineer
ENERGY AND UTILITIES
June 2023 - December 2023 (6 months)
Essen, Germany
Development of a new platform for capturing and processing power plant data. The platform comprises several applications that provide functions such as data entry, administration, and analysis of power plant information.

In addition, I was involved in migrating a legacy .NET application for statistical analysis of power plant behavior from an on-premises environment to the AWS cloud. Only the core of the business logic could be retained from the original source code. Due to the new environment, fundamental architectural adjustments were necessary, which led to a large part of the application having to be redeveloped from scratch.

My responsibilities included
Development of the user interface with Angular
Creation of tests with Cypress
Optimization of backend services with TypeGraphQL
Co-designing a new cloud architecture for the existing on-premises application
Migration of the on-premises application to the new cloud architecture

Creation of Lambda functions in C#

Core Technologies
Angular, AgGrid, Cypress, Docker, MongoDB (incl. Aggregation Pipelines), TypeGraphQL backend, Terraform, .NET (C#), AWS Lambda, AWS Step Functions

Environments
Azure DevOps, AWS
Angular MongoDB C# Azure DevOps Typescript
Novartis
Tech Lead
PHARMACEUTICALS INDUSTRY
March 2021 - February 2023 (2 years)
Further development of a platform for visualizing company data. As Tech Lead, I was responsible for the conception and implementation of new features in consultation with the development team and project managers. I also worked as a developer myself.

Technical highlights of this project:
● Frontend
○ React application (yarn Monorepo).
○ Component development with Storybook.
○ Strong focus on charting (D3).
○ Apollo GraphQL.
● Backend
○ GraphQL API with NestJS.
○ Connection to PostgresDB with TypeORM.
○ Deployed as a Docker container in AWS Fargate.
○ Event-sourcing based ingestion pipeline with SQS, DynamoDB, and AWS Lambda.

Among other things, my activities included:
● Extension of the existing role-based access control implementation. The requirement was to expand it with attribute-based capabilities (RBAC -> hybrid ABAC / RBAC). This was implemented in the backend with the "Casbin" library.
● New development and further development of React components.
● Coaching of developers.
● Creation of new CI/CD pipelines with Jenkins.
● Introduction of the "Gitflow" development model.
● Management of the development of an in-house component framework based on MaterialUI 5.
● Setting up and leading technical discussions regarding the implementation of new features.
● Interviewing and onboarding new developers.
● Introduction of the AgGrid table library as a replacement for the in-house developed table component.
● Cloud migration of the application stack, including Atlassian stacks.
● Point of contact for the QA team.
Typescript React.js NestJs GraphQL AWS