React Experts in Essen

Gronic Ident & Sign

Core technologies: Android, Jetpack Compose, Retrofit, Regula Document Reader, Adobe Sign

Android app on dedicated devices for identifications and electronic signatures at the PoS

• Training AI models, evaluating images and text UI/UX, turning the provided data into insights through OpenAI Feather as part of the machine learning workflow

Technologies: OpenAI Feather

• Delivered MVP-focused full-stack architecture for a health-sector client: Vite/React frontend, backend services on Google Cloud Run, and Supabase for database plus IAM/authentication.
• Supported product requirements engineering and prioritized cost-aware workload placement, implementing browser-side/edge computation where feasible before moving logic to backend services.

• Expansion and support of the product portfolio for video analytics and Computer Vision
• Requirements gathering and requirements engineering
• Consulting, project management, and coordination of pilots and the international rollout
• Tools: IP-based camera and video systems, Citrix Administration, OneNote, Microsoft Teams, Node-Red, Office 365, Age Verification, Qognify Umbrella, Thingsboard, Xovis 3D Sensors, AXIS Cameras, GK POS software, Atlassian JIRA

• I carried out a software audit and architecture consulting for an existing portal software for infrastructure provisioning for a company that offers virtual reality environments.
• Role: Mentoring and consulting
• Technologies used: Java

• Design and implementation of a system for controlling the complete process of installing, removing, and replacing electricity meters by external service providers for an energy supplier

• Automated retrieval of orders and available devices through defined interfaces (e.g. from SAP)

• Orchestration of the process steps (assignment of meters, processing of meter data, transfer of updated information back to the source system) through a Spring-Boot backend

• Provision of a React-based web client for operational tracking and control of orders, e.g. to continue failed process steps or resend notifications

• Support in restructuring and designing the group's internal Android apps
• Defining essential modules and implementing accessible components
• Establishing agile approaches at an international level
• Technologies & Methods: Kotlin, Android, JUnit 5, Koin, Azure DevOps, Android Studio, Git, Jetpack Compose, Coil, Flow API, Ktor, Coroutines, TypeScript, Node.js

• Re-architected a web application that had grown over years, modularizing tightly coupled components

• Reduced response times from several seconds to <50 ms

• Removed performance bottlenecks

• Simplified architecture so internal teams can implement features on their own again

• Built modern web applications using React and NestJS.
• Developed frontend with React, TailwindCSS, shadcn/ui for elegant and responsive interfaces.
• Implemented backend APIs and authentication using NestJS and Node.js.
• Utilized AWS and Supabase for cloud deployments.
• Integrated Salesforce for CRM and data management.

• Main contact for the customer for all matters relating to the delivery of services in the sub-area
• Responsible for service delivery in the sub-area and coordinating the delivery results to be achieved (project planning)
• Validation of the sprint planning of the associated teams against the project plan
• First escalation point when estimates cannot be agreed upon
• Resource management for 17 project employees
• Continuous process improvement
• Risk management of any kind that could endanger delivery
• Reporting of results internally and to the customer, such as project execution and milestone achievement
• Responsible for the budget in the sub-area (revenue, profit)
• Identifying and implementing financial optimization needs
• Ensuring that the Jira elements in the sub-area are maintained according to financial and agile guidelines
• Set up an Informatica Core team
• Project management for various migration projects

• Significantly enhanced user experience and application performance through spearheading the development of frontend components, emphasizing native JavaScript, Vue.js, and UI implementation.
• Ensured efficient data flow and content management by seamless integration of backend APIs (REST) with frontend components and successful connection to CMS Hippo elements.
• Increased sales volume on the customer page through the development and implementation of new components, leading to improved user engagement and conversion rates.
• Worked in an Agile Scrum environment.
• Utilized technologies such as JavaScript, Vue.js, Node.js, Azure DevOps, Azure Functions, Next.js, and more.

• Project Livebash (2021-12-01–2023-12-31)

• Development and design of the core system

• Code reviews

• Developer management

• CI/CD

• Client communication

• Leading epics

• Speaking at conferences

• Managing the production system

• Interviewing project developers

• Outcome: production system

• Technologies and tools: Java 11, Java 17, Kotlin, Spring Boot, TeamCity, Gradle, AWS DynamoDB, JUnit, Mockito, Docker, Docker Compose, AWS SQS, AWS EC2, AWS S3, AWS MediaLive, Ethereum, Postman

• Project Robinhood (2024-01-01–2024-05-31)

• Customization and development of product features for specific clients

• Interviews with project developers

• Technologies and tools: Java 17, Java RX, Kotlin, Spring Boot, TeamCity, Gradle, JUnit, Mockito, Docker, Docker Compose, PostgreSQL

• Projects Sway, Tickmill, Pepperstone, UCapital (2024-06-01–present)

• Customization and development of product features for specific clients

• Bug fixes

• Porting tickets from the product

• Feature development

• Technologies and tools: Java 17, Java RX, Kotlin, Spring Boot, TeamCity, Gradle, JUnit, Mockito, Docker, Docker Compose, PostgreSQL

• Design of requirement verification based on the INVEST principle
• Implementation of the prediction model with scikit-learn and BERT
• Implementation of the web client with ReactJS and FastAPI
• Adaptation of the T5 model to improve user story generation according to the INVEST framework
• Certification of NLP and scikit-learn
• Technologies: Python, NLP, Scikit-Learn, BERT, T5, ReactJS, FastAPI, Cursor Visual Paradigm, Visual Studio, Draw.io, NSIS, vite, Electron

• Customer service and point-of-sale (cash register) operations
• Inventory management and stock organization
• Strengthened German language skills through daily customer interaction
• Worked collaboratively in a fast-paced, team-oriented environment