Christos Digkas M.Sc.

Recruited into a permanent senior leadership position following a highly successful contract as a freelancer to orchestrate digital transformation and automate complex business operations.

• E-Rechnung, AI Automation & Azure Integration: Engineered an intelligent C#.NET application for automated end-to-end processing of e-invoices (XRechnung and ZUGFeRD / EN 16931). Implemented Machine Learning models (Intelligent Document Processing) for semantic analysis of email contents and attachments, driving automated classification of invoice data, AI-driven barcode assignment, and integrating Azure OIDC authentication for highly secure mailbox polling.
• Automated Invoice Processing (End-to-End): Conceived and executed an end-to-end workflow automation strategy for corporate invoice validation. Integrated complex third-party tools including ABBYY (OCR), M-Files (DMS), DATEV (Accounting), and COOR (Cost Management).
• DMS Development (M-Files): Programmed production-ready Vault Applications and custom UI Extensibility Framework UI solutions using C#.NET alongside data manipulation scripts using Python.
• Data Interoperability & Reconciliation: Designed and developed automated synchronization and control mechanisms to perform real-time data reconciliation between DATEV, S-Firm (banking transactions), COOR databases, and M-Files metadata layers utilizing Python, Java, Spring Boot, and Angular.
• Business Intelligence Portal: Architected and built a centralized corporate Web BI Portal (Apache environment) for real-time extraction and dynamic visualization of data across highly heterogeneous sources (Domus ERP, SQL servers, custom applications) via automated ETL pipelines and heavy utilization of REST APIs. Successfully delivered over 175 custom-coded technical modules built with PHP, JavaScript, and JSON to optimize executive management reporting and steer operational change management initiatives.
• Web Development: Successfully delivered a comprehensive core technical relaunch and ongoing systems support for the main corporate web presence (city-1.de) based on the Contao CMS framework.
• Reporting & Data Validation: Implemented an enterprise-wide monitoring system to deliver automated system integrity reports, detailed KPI tracking, and extensive plausibility checking algorithms to identify data mismatch errors.
• Cloud & DevOps: Deployed secure corporate micro-applications (e.g., automated leave management systems) onto Linux environments utilizing containerized Docker infrastructure, configured with full single sign-on integration via Azure Entra ID (OIDC).
• Automated Dunning Systems: Developed and deployed a custom 4-stage automated dunning process by extracting real-time financial data structures directly out of the underlying Domus ERP database layer, enabling automated communication dispatches and tracking payment inflows.
• Infrastructure Management: Administered a highly available virtualization and storage environment utilizing VMware vSphere architectures, Veeam Backup & Replication solutions, and MailStore server archiving platforms.
• Network & Security: Supervised corporate boundary perimeter security via deep packet inspection configuration on SonicWall Firewalls and orchestrated mobile device management policies via Microsoft Intune (Endpoint Manager).
• Mobile Apps & Webhooks: Built custom field-operations cross-platform mobile apps via SmapOne to automate building deficiency tracking, deploying real-time webhook mechanisms for instantaneous back-end syncing.
• IT Infrastructure & Tooling: Provisioned and maintained a local Linux-based GitLab instance for corporate source code management and introduced osTicket as the central helpdesk infrastructure to streamline daily IT operations support.

Contracted to build modular backend business web applications and perform secure remote systems engineering for dedicated server farms.

• Backend Architecture: Developed high-performance dynamic web services utilizing ASP, VBScript, and compiled custom ActiveX DLL Server Components built via Visual Basic 6.0.
• Systems Administration: Executed advanced server administration across Windows 2000 Server landscapes over Terminal Services protocols, including custom setups for Ipswitch IMail servers and relational enterprise database engines.
• Database Management: Configured and indexed production-level database structures using Microsoft SQL Server.
• Frontend Web Stack: Created interactive user application views using rich JavaScript, structured HTML, and object-manipulated DHTML codebases.

Successfully spearheaded the architectural development of the strategic "OCEAN Project" (Open Corrosion Expertise Access Network) commissioned directly by UMIST University (Manchester, UK) under the technical direction of Dr. Cottis.

• Full-Stack Architecture: Engineered the comprehensive design and coding paradigms for all 5 core platform sub-systems (Directory, Harvester, Dictionary, Query Engine, and Toolset).
• Technical Ecosystem: Deployed stable enterprise software components utilizing Java 2 SDK, JSP, and Java Servlets, hosted on Apache and Tomcat server layers connected to a PostgreSQL relational database engine running over Unix.
• Scientific Communication: Presented the software platform's design, architectural advantages, and live code pilot to international delegations at the Eurocorr 2001 Conference in Riva del Garda, Italy.
• Professional Endorsement: Letter of reference and commendation officially issued by Dr. Cottis confirming exceptional project stewardship and technical milestones.

Programmed custom B2B and B2C web applications optimized for scalability within the emerging E-Travel and global E-Commerce sectors.

• Full-Stack Coding: Maintained and upgraded transactional web modules leveraging ASP, VBScript, and native client-side JavaScript.
• Database Engineering: Modeled relational data entities, wrote complex T-SQL queries, and performed index tuning optimizations.
• Environment Support: Managed development staging operations inside Windows NT and newly deployed Windows 2000 Server lab topologies.

Selected into a specialized computing role, successfully blending advanced data center operations with core military combat discipline.

• Mainframe Operations: Conducted critical daily processing on centralized IBM AS/400 systems to oversee automated military logistics management workflows (OSEYS platform). Coded custom COBOL scripts to perform batch script scheduling and transaction log validations.
• Tactical Combat Training: Successfully achieved all milestones of rigorous live-fire field training, weapon systems proficiency, and military survival courses, proving maximum resilience and team cohesion inside strict chain-of-command protocols.
• Mainframe CLI Governance: Administered relational structures and maintained data records strictly over terminal Command Line Interfaces (Green Screen environments), safeguarding the data accuracy of the battalion.