Software Developers in Germany

Gas sensor technology and conversion of device data

Developed two applications to convert configuration data between different versions of gas sensor devices. Existing data is read and made available for the new device version after conversion. Used, among other things, for device upgrades.

Technology: Delphi 12 Athens.

Development and further enhancement of an internal quotation system for managing and analyzing insurance policies. The focus was on consolidating existing systems, establishing modern development standards, and improving testing, security, and deployment processes. Alongside implementing new features, special attention was paid to code quality, security, and performance.

Responsibilities:

• Full-stack development of an internal quotation system based on Spring Boot and Angular
• Design and implementation of a secure Spring Security configuration, including certificate management
• Merging two bounded contexts using Domain-Driven Design (DDD)
• Introducing and integrating Testcontainers for automated integration tests
• Establishing and applying common testing methods (unit, integration, and end-to-end tests)
• Presenting and integrating Cypress as a black-box GUI testing tool
• Improving the CI/CD pipeline through automated versioning and a custom Jenkins Library
• Proof of Concept (PoC) for state management with NgRx in the frontend
• Refactoring legacy code and fixing incorrect Spring Boot configurations
• Training developers in Clean Code, best practices, and the Spring Framework
• Developing a tool to analyze test data and improve quality
• Further development of the existing Cucumber project
• Carrying out dependency updates and analyzing and maintaining the application
• Implementing telemetry and building a Dynatrace dashboard
• Improving technical documentation in line with Arc42 and introducing AsyncAPI

Technologies: Scrum, TDD, CleanCode, Spring Boot, Java, Angular, NgRx, Testcontainers, Cypress, Cucumber, Jenkins, Dynatrace, Docker, Git, Maven, Kafka, Oracle, REST, DDD, Arc42, AsyncAPI, IntelliJ, Jira, Confluence, Windows, Linux

• End-to-end ownership of client projects, from requirements to rollout
• CTO of Edumix, a platform for interactive learning content (not yet released)
• CTO of a B2B AR app with indoor navigation and a digital twin (Matterport)
• OnePortrait: migration from Node.js/Nuxt to React, Next.js and Go
• Interactive Three.js mosaic featuring thousands of images
• Daily use of AI tools and coding agents (agentic coding)

Technologies: React, Next.js, Go, Node.js, Unity (Editor Extensions, UaaL), Flutter, iOS, .NET MAUI, Supabase/PostgreSQL, Three.js

Projects: Edumix, AR Indoor Service App, OnePortrait

• Development of modern, maintainable, and accessible web applications
• Consulting on digital accessibility (WCAG/BITV), audits, and implementation of fixes
• Focus on frontend architecture, code quality, automated testing, and modern development methods
• Ongoing professional development in AI-assisted software development with Claude Code and Spec-Driven Development (SDD), especially requirements analysis, writing user stories, and structured implementation of software requirements

Tech Stack: React, TypeScript, Next.js, JavaScript, HTML, CSS, Jest, Vitest, Playwright, Cypress, AWS

Extension of the company website

• Developed new software components as part of a Scrum team
• Took turns with other members of the development team to perform smoke tests after releases

Achievements:

• Enhanced the website with new features
• Conducted code reviews and pair programming
• Advised the customer and trained the editors
• Implemented continuous delivery

C# Contract Programming for Special-Purpose Machinery/Visualization Technology

C# contract programming; .net; WPF, WCF, MVC, MVVM

Customization and further development of control software for special-purpose machinery (programming machine sequences), with corresponding interface connections to create a graphical user interface for the mechanical engineering environment (mapping scan processes in 3D)

Quality assurance before handover for use in the customer's live operations

Software, hardware and systems used:

• Windows 2003 Server
• Windows 2008
• Visual Studio 2012 and later
• Various customer-specific hardware and software
• .net Framework
• TFS

• Planning and further development of responsive CMS websites
• Frontend development and extension of internal PHP applications
• CONTENS and OpenCms

Fiverr client

• Fixed consumer issues in a production Kafka environment.
• Analyzed consumer lag with Datadog.
• Added synthetic tests to detect issues early.

Stack: Kafka, Datadog, Consumer Groups

I assess the skills of project managers, also taking into account the feedback of the leaders they name.

Software engineering and integration consulting for enterprise clients, with a focus on backend development, APIs, system integration, and event-driven architectures. Currently developing and evolving a recruitment and staffing platform using Elixir and RabbitMQ, including asynchronous, event-driven communication and integrations with external recruitment and staffing platforms.

• Development of Power BI reports, measures, and KPIs for sales, purchasing, materials management, warehousing, and production
• Analysis of the proALPHA database (Progress OpenEdge) and high-performance SQL queries for extraction and transformation
• Data models, ETL processes, and pipelines including automated refresh via Power BI Service and Data Gateway
• Gathering requirements and implementation in close coordination with the specialist departments

Selected projects:

• Sales report: revenue, incoming orders, and order status
• Purchasing report with automated purchase suggestions (Power Automate)
• Monitoring of missing parts for production and materials management
• Production bills of materials on Microsoft Fabric including deployment pipeline (Dev → Prod)
• Forecast comparison report
• Central Power BI apps that bundle all reports by department

Technologies: Power BI, DAX, Power Query (M), SQL, proALPHA, Progress OpenEdge, Microsoft Fabric, Power Automate, Python

• Co-built a full e-signature and identity verification platform in a two-person team with a senior backend developer, with no designer or PM: all product, UX, and scope decisions made jointly.

Next.js / TypeScript