Jitsi - Video conferencing system with AI-powered simultaneous translation (Prototype)

Set up and customized a containerized Jitsi instance for live speech recognition (VOSK) and real-time automatic translation (LibreTranslate, LMU fairseq).

Built and executed a quantitative investment strategy using GPT-3.5 to analyze 20,000 earnings call transcripts from the top 500 US companies over a 10-year period. Implemented data analysis and backtests in Python & C#.

Developed the ZEISS Connected Quality Platform—a solution for monitoring measurement systems, managing measurement plans and quality processes, and accessing raw system data. I focused on building a robust .NET infrastructure with Keycloak authentication, RabbitMQ messaging, MSSQL database management, Angular/React SPAs, TLS encryption, backup integration, monitoring, and support for Windows on-premise and Kubernetes clusters. The challenge was to run the platform across Windows on-premise and Kubernetes while ensuring an optimal local Windows development environment for efficient debugging and development.

• Designed and deployed isolated Connected Quality platform instances in separate Kubernetes namespaces with infrastructure components (MSSQL, RabbitMQ, Keycloak, reverse proxy, Kubernetes Dashboard, HashiCorp Vault).
• Built missing components for a full CI/CD and self-healing process: SQL Server configurator (Bash), Dashboard proxy (JavaScript), Deployment status controller for CI/CD.
• Automated Kubernetes clusters in various setups: 1) AKS with cloud resources, 2) Rancher K3s in Docker on Windows desktop, 3) K3s on Ubuntu VM, 4) Windows Server VM with nested Ubuntu K3s, 5) IoT Edge cloud deployment, 6) Red Hat OpenShift self-hosted.
• Automated container image builds (Docker, Podman, Buildah), created minimal images from scratch, debugged, tested, documented for reuse.
• Implemented deployment strategies: GitOps with Kustomize templates, Mozilla SOPS for secrets, custom GitOps operator, Octopus Deploy with Helm via semver pipelines, FluxCD for automation.
• Proof-of-concept IDP (Humanitec, score.yaml, Backstage).
• Developed a master CI/CD pipeline for 15 services with Azure YAML: building (msbuild, npm, maven, docfx, pandoc), unit tests, CVE scans (BlackDuck), FOSS SBOM, E2E tests (Selenium, Playwright), nightly reports in Teams.
• Generated deployment scripts (Helm, Kustomize, Python, Jinja2, Bash, MSI) and a UI via Octopus Deploy.
• Automated release versions based on Git branches instead of manual models.
• Maintained and consolidated CI/CD platforms (GitLab, GitHub Actions, Tekton).
• Migrated projects to a monorepo (Azure DevOps) and sync for parallel Atlassian project.
• Auto-created feature-branch environments with latest builds; optimized performance with caching and skipped sub-pipelines.
• Built Windows installer for ~10 services with WiX (Heat, Candle, Light), custom C# actions, certificate validation.
• Created Python CLI for uniform local dev setup (Dotnet, MSSQL, NodeJS, RabbitMQ, JDK) and improved DevX: build, configure, deploy steps, debug from VS, caching via MD5.
• Infra as Code: provisioned Azure resources (VMs, storage, DBs, network, Key Vault, DNS, ACR, Logic Apps) with ARM/Bicep, Terraform, Ansible; Crossplane and custom Kubernetes controllers.
• Managed Kubernetes, Linux VMs, Windows servers: setup, config, maintenance, automation, security, troubleshooting.
• Built monitoring with OpenTelemetry, Grafana, Loki, Prometheus, Tempo; dashboard for latency, traffic, errors, saturation; instrumented .NET and Angular apps.
• Maintained living docs with docfx, release notes via pandoc (Markdown, LaTeX, HTML, PDF), Docker scripts.
• As part of architecture team, engaged in Agile SCRUM with Azure DevOps and Atlassian (Jira, Confluence).
• Enforced security and compliance: HashiCorp Vault integration, .NET config provider, SecOps—scratch images, code reviews, automated scans, threat modeling, vulnerability fixes.
• Generated FOSS disclosures and SBOMs for compliance and supply chain.
• Documented backup, restore, and disaster recovery for Kubernetes and Windows.
• Built backend systems: RabbitMQ PubSub library in C#, DSL-based Keycloak configurator in JavaScript, reverse proxy/SPAs with YARP in C#, cell architecture and ports-and-adapters in .NET with TDD, BDD, contract tests, DDD.

Scaled Microsoft System Center Configuration Manager (SCCM) for over 150,000 clients. I designed a testable, scalable architecture, integrated authentication (IWA, JWT), MSSQL, RabbitMQ message bus, and automated CI/CD and infrastructure.

• Automated DevOps processes and infra management: Azure DevOps CI/CD; infra stack of Windows Server 2019, SQL 2019, IIS 10, .NET Framework/Core, NuGet, RabbitMQ.
• Deployed Azure resources (VMs, Storage, DBs, VNets, Key Vault, DNS, ACR) via ARM templates and PowerShell.
• Developed in C# and JavaScript with cell-based, fractal architecture and ports & adapters.
• Improved dev process with Example Mapping, Gherkin acceptance tests, feature slicing, coding standards, pair programming.
• Evaluated cloud integration tech: Azure APIM, Functions, Docker.
• Built IWA↔JWT auth bridge.
• Designed modular, testable system to reduce manual tests from 90% to 10%.

At VIDEO OASE, a video marketing portal, I delivered a serverless proof of concept, used UX tools for prototyping with the client, and built core features: user registration, login/logout, password reset/change, protected routes, simple search, and Excel data import.

• Search portal with Firebase serverless tech using JavaScript, React, Bootstrap, and PayPal.
• User registration, authentication, password management, route protection, search, PayPal payment, Excel import.
• Collaborative prototyping via Proto.io to visualize UX before dev.

At BALLUFF, I created a test framework for an IO-Link device in C++ and Python, automated formal documentation for TÜV certification, and wrote Arduino firmware integrating RFID and barcode scanners.

• C/C++ unit tests (CppUnit) for embedded IO-Link code.
• Improved error handling and stress tests in Python; documented with Doxygen; setup Jenkins jobs.
• Rewrote Arduino firmware with state machine and Clean Code.
• Integrated RFID and barcode readers via USB protocol.
• Fixed bugs on custom Arduino boards.

At SYNATEC, I worked on automotive traceability software, managing XML files, improving event traceability, and handling high message throughput. I found and fixed memory leaks and crashes, integrated fixes, and optimized performance.

• C/C++ and Qt software for XML management, event traceability, high throughput.
• Identified and fixed memory leaks and crashes; integrated fixes and measured performance.

Built a real-time TV ad tracking platform with C/C++, Go, Kafka, PostgreSQL on Linux. I found a critical memory leak (integer overflow) over three months using Valgrind, gprof, and system monitors, fixed it, and stopped daily crashes. I also set up servers, video tuner cards, and smartcard decryption.

• TV video cutter in C (ffmpeg, pthreads) for real-time ad tracking.
• Dynamic ring buffer in C for streaming video.
• Go microservices and a store-and-forward Kafka client (Sarama, PostgreSQL).
• TVIB REST API in Go for real-time triggers.
• Browser apps in Angular 1.0, Node, Express.
• AWS deployment with Chef, Autotools, Docker.
• Video tuner cards and smart cards setup (Unix, Bash, C++, Python) with DVBlast config.
• Linux admin: memory leak fixes (valgrind), perf tuning (gprof), CPU/memory monitoring.

At startup SMOOSTER, I enhanced their CMS using Ruby on Rails and JavaScript, added a robust auth system, frontend test automation, optimized media delivery with caching and CDN, solved scaling issues, and improved SEO.

• Developed new features in Ruby, JavaScript, and MongoDB.
• Integrated authentication with Omniauth, REST, and AJAX.
• Used TDD and Clean Code, rewriting 40% of code for clear views, thin controllers, normalized models, and REST.
• Expanded frontend tests with RSpec and Selenium.
• Improved media delivery via caching and CDN on AWS (Bash, Linux).
• Scaled sites with load balancing and boosted SEO via social media.

As a trainee and Windows Server admin at Siemens AG, I gained extensive software development experience.

• Programmed microcontrollers in Assembly and Embedded C/C++, developed LCD drivers for C167 (16-bit, RTOS, CAN bus).
• Programmed Siemens automation systems (SIMATIC S7).
• Managed and monitored over 100 Siemens servers, handling Windows accounts, file/share/print services, server updates, and management.