Legacy Modernization Experts in Germany

• Development of cloud native applications to provide a multi-vendor marketplace for different digital assets (e.g. NFTs)
• Design and operation of a microservice architecture using Nest.js, MySQL, Redis, Hasura, Algolia, Docker and Serverless
• Design and operation of a streaming data architecture using Kafka (with JSON Schemas)
• Creation of CI/CD pipelines with GitHub Actions for automated deployment of applications
• Testing and evaluating new technologies for more stable, faster, safer and more sustainable application development
• Building the full infrastructure with Terraform in AWS
• Integration of Stripe to handle international payments
• Use of Algolia for real-time search of digital assets on the platform
• Presenting results to stakeholders and running internal meetups
• Federation of services with GraphQL and Hasura
• Discussions about architecture decisions in the IT landscape and their impact
• Use of message queues for app-internal communication and component encapsulation
• Advising internal staff on the implementation of business and technical requirements
• Test Driven Development: unit, integration and E2E testing using JUnit
• Use of Next.js/React with SASS/SCSS for frontend applications
• Use of Vue.js with SASS/SCSS for frontend applications
• Integration of security-related mechanisms (JWT tokens with Auth0, OAuth, OIDC, IP guards, BOLA, secret vaults)
• Creation of microfrontends using Retool for fast prototyping and testing of functionality
• Use of nx monorepo with nrwl

• Development of safety-related embedded software for a mobile machine on a Hydac TTC 2390 controller.
• Implementation in C with consideration of SIL 3 / ASIL D and MISRA-C:2025.
• Implementation of communication via CAN, CANopen, and J1939.

Standards, guidelines and norms: ISO 26262, IEC 61508, MISRA-C:2025

Technologies: C99, Hydac TTC 2390, Infineon TriCore Aurix TC397, Hightec C/C++ Compiler, PC-lint Plus, CAN, CANopen, J1939, MISRA-C:2025

Enhancement and modernization of a mature Aspire backend application in the environment of a utility company, focusing on new business requirements, testing, legacy code cleanup, and stable backend delivery.

Core contributions & results Implemented new business requirements in the context of customer orders, subcontractors, and cross-company backend processes, and ensured consistent workflows in a distributed system landscape. Modernized existing backend components step by step and reduced technical debt through targeted legacy code cleanup, refactoring, and structured code reviews. Improved the testability of business-critical services by expanding automated tests with xUnit, AutoFixture, and clearer validation structures. Supported the further development of workflow automations and integration processes via microservices, messaging, and API-based communication. Took over source code from external firms, systematically checked code quality, and derived technical improvements for maintainability, stability, and integration. Worked in agile development processes with Jira, Confluence, and Azure DevOps and supported cross-team alignment on architecture, quality, and implementation. Technical metrics Technologies & methods C#, .NET, ASP.NET, ASP.NET Core, Aspire, Docker, RabbitMQ, gRPC, REST API, Swagger, Microservices, NServiceBus, AutoMapper, Autofac, xUnit, AutoFixture, FluentValidation, Entity Framework Core, MediatR, Redis, Consul, Serilog, SonarQube, Azure DevOps, Azure Monitor, GitLab, Google Protocol Buffers, IronPDF, Mailjet, Jira, Confluence, Miro, agile development, Scrum, code reviews, refactoring, legacy code cleanup, workflow automation, power grids

• Impact: Built modular consent platform for OpenGateway specifically, handling multiple consent types beyond legitimate interest and consent
• Enabled integration across major user-facing and backend systems with comprehensive regulatory coverage
• Delivered production-grade APIs supporting multiple lawful bases for processing
• Integrated partner applications (PayPal, Airbnb, Google, Meta) with consent workflows
• Reduced backend latency to outperform European benchmark levels
• Rolled out omnichannel consent across app, web, POS, and service touchpoints
• Aligned Spanish platform and legal teams with German rollout and stakeholder needs

Manufacturing intelligence platform with enterprise workflows, RAG, real-time AI assistant features, and multi-repository backend architecture.

• Built and extended production AI/backend services with Django, DRF, FastAPI, GraphQL, Celery, PostgreSQL, MySQL, Redis, and WebSockets across a modular multi-repository platform.
• Contributed to ARIS V2, a real-time manufacturing AI assistant using LangChain, LangGraph, MCP tool orchestration, planning/execution flows, OpenAI, AWS Bedrock, Qdrant, and Elasticsearch/OpenSearch-backed retrieval.
• Supported rollout expansion from ARIS V1 in 4 of 17 client production plants to ARIS V2 currently active in 13 of 17 plants, increasing real-world deployment coverage to more than 50% of the client footprint.
• Worked on document-grounded RAG functionality including ingestion, OCR, chunking, embeddings, indexing, retrieval, reranking, and grounded answer generation for industrial workflows.

Stack: Python, Django, DRF, FastAPI, LangChain, LangGraph, GraphQL, Celery, WebSockets, OpenAI, AWS Bedrock, Qdrant, Elasticsearch/OpenSearch, PostgreSQL, MySQL, Redis, Docker.

AI-supported development and PM acceleration with agentic workflows; deep reinforcement learning; fully automated 24/7 setup.

Design and implementation of a compact ERP, CRM, accounting, and production-planning platform for a German food manufacturer. The system replaces Rechnung11, self-built Excel sheets, and manual processes for fewer than 10 internal users.

• Designed and implemented the full platform architecture as sole architect and developer.
• Built modules for customer management, B2B order handling, invoicing, production planning, and accounting support.
• Implemented DATEV export, ZUGFeRD/XRechnung e-invoicing, FinTS bank statement synchronization, and GoBD audit trail concepts.
• Used AI-supported workflows for prototyping, test support, and implementation acceleration while retaining full architecture, review, testing strategy, and technical ownership.

Technology: Java 23, Spring Boot 3, Spring Data JPA, Spring Security, Vue 3, TypeScript, PostgreSQL, Flyway, REST, OpenAPI, JWT, TOTP, RBAC, DATEV, FinTS, ZUGFeRD, XRechnung, GoBD, JUnit, Mockito, Testcontainers, Playwright, Docker, GitLab CI/CD

Technical audit for scientific software.

Consulting and prototype work on AI voice and multilingual agent systems, using AI-assisted delivery across realtime translation prototypes, call-centre automation, and voice-to-voice consultation workflows.

• Built and advised on AI voice / agentic conversation prototypes, including realtime translation and consumer-facing consultation experiences.
• Worked across call-centre automation, voice UX, product architecture, implementation tradeoffs, and prototype development.

• Consulting, design, analysis, software architecture and development
• Designing, developing, and implementing a Pimcore environment and connecting multiple external API systems in a Kubernetes environment, as well as various PIM and ERP systems
• Technologies: Unix environment, design, Symfony development, PHP 8+, software architecture, MySQL/SQL, shell scripting, Git DevOps tasks, AI coding support, Pimcore 12, Shopware 6
• Team size: >10 people

• Led large-scale legacy modernization and cloud migration programs for enterprise and banking clients across Europe.

• Directed the migration of 2500+ Lotus Notes mailboxes to Microsoft 365 (Outlook) using Azure VM with Binary Tree application.

• Architected and delivered transformation of legacy Lotus Notes applications to ServiceNow, SharePoint and AWS ECS (RDS MySQL, Secrets Manager).

• Designed and governed Java Spring Boot microservices architectures deployed on AWS ECS, using Terraform to replicate infrastructure.

• Organized Agile/Scrum sprints with daily stand-ups, reviews and retrospectives.

• Implemented DevOps practices, including CI/CD pipelines and Jenkins automated tests for deployment and performance monitoring.

• Managed international offshore teams by defining KPIs, resolving delivery risks, and ensuring on-time execution.

• Collaborated during ServiceNow ITSM implementation.

• Owned budget planning, cloud cost optimization, financial reporting, and executive dashboards.

• Delivered KPI/SLA monitoring application in Lotus Notes, automating tasks and improving Excel reporting efficiency by 100%.

• Reduced post-migration stabilization time by 30%.

• Improved user experience and platform adoption across migrated systems.

• Technology stack: AWS ECS, RDS MySQL, Azure VM, SharePoint, ServiceNow, Java 8, Spring Boot, JUnit, HCL/IBM Lotus Domino & Notes

• Analysis of legacy codebase and identification of architectural issues, implementing improvements in coordination with the Product Owner.
• Development of clean, efficient, and fully documented code following established software engineering practices and standards.
• Analysis of Erlang components in backend and device layers to provide recommendations for ensuring stable system operation.
• Setup and optimization of CI/CD pipelines on client infrastructure, including testing, debugging, and certificate management quality assurance.
• Participation in planning, design, and implementation of epics and stories according to Product Owner specifications.
• Technical consultation for Product Owner regarding Erlang codebase management and best practices.
• Collaboration with Product Owner, Scrum Master, and development team to ensure timely delivery of features.
• Elixir & Phoenix + PostgreSQL
• Erlang
• IoT
• CI/CD
• Git
• Agile/Scrum
• Docker
• Kubernetes
• Frontend (VueJS)
• Embedded Devices

• 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

• Strategic overall management of the global IT application landscape and further development of the roadmap for core applications (Salesforce, SAP, Workday, OpenAir, Jira)
• Realignment of the IT architecture towards cloud-native (IaaS/SaaS) and establishment of an agile DevOps culture and process automation
• Leading the IT application workstream for the successful separation of four business units (carve-outs)
• Acting as a strategic business partner for C-level functions (COO, CRO, CHRO) to ensure IT-business alignment
• Representing IT interests to employee representative bodies and ensuring compliance
• Reduced maintenance effort by 66% by designing and rolling out a new customer portal
• Implemented a fully automated CPQ self-service to accelerate sales processes
• Successfully went live with critical business platforms to support the target operating model (e.g., Dayforce for HR/payroll, Coupa for P2P, Zuora for billing)
• Replaced legacy custom software with scalable SaaS standard solutions (legacy modernization)