Fractional · Interim · Permanent
I build technology that carries your business through highs and lows: from architecture to AI strategy. Founder with an exit, 20+ years of IT platforms for enterprises, mid-market and startups, AI agents in daily use.
For startups, scale-ups, mid-market and enterprise.
Technology leadership, from startup to enterprise.
AI from strategy to operations, focused on business value.
Mission EC GmbH: 18 employees, SaaS for 4 Volkswagen Group brands.
Kununu rating 4.9. Exit in 2025.
BMW, Audi, VW, Giesecke+Devrient, EADS, banking & finance, …
From smartcards to serverless.
Built an ISMS without external consultants.
TISAX audit with zero findings.
SaaS security audit rated “good”.
Carnegie Mellon Deep Learning (99.6%).
LSE AI Law & Governance.
Oxford Saïd MBA Fundamentals (Distinction).
Agentic development, every day.
Sole technology and product responsibility as fractional CTO, delivered single-handedly from strategy to code: developed the business strategy together with the founders, set up product and agentic requirements management, designed and built a serverless cloud solution through agentic development; AI-driven automation of requirements and delivery processes (Claude Code, Gastown, MCP).
Technologies: AWS · SST · Serverless · Lambda · DynamoDB · Next.js · Tailwind CSS · TypeScript · Python · WebSocket · Cognito · OpenRouter · Agentic Development · Claude Code · Gastown · MCP
Founded, built and led until its sale on 1 January 2025 with an orderly handover to the acquirer: SaaS and IT consultancy automating security assurance across the system landscapes of four VW Group brands; the core technology built from scratch by the two founders. Responsible on the management board for the client relationship, compliance & IT security, and people. A team of up to 18 employees with a 4.9 Kununu rating; TISAX AL2 with zero findings.
Technologies: AWS · Python · VueJS · MQTT · OpenSearch · CI/CD · JavaScript
Team size: ≤18
Gathered requirements in workshops and consolidated them into a feature map, designed the test and monitoring ecosystem as principal architect and led the implementation. The ecosystem goes beyond the state of the art: it tests the complete chain from vehicle via app, portal, CMS and data lake to contract management and dealer systems, simulates vehicle communication for tests without a physical car and works in development as well as live monitoring; a bot army generates, refreshes and cleans up test data at scale. Distribution of test results via MQTT to consuming systems such as Jira or PagerDuty; analytics via OpenSearch with drill-down to REST call and screenshot. Result: more than 30,000 test results per day, visibility of the availability of the entire system landscape; in use across four group brands, 20+ projects and more than 10 service providers.
Technologies: AWS · Python · Selenium · Appium · MQTT · Jenkins · Jira · REST · XML · VueJS · Vuetify · JavaScript
Team size: >200
Led the IT security clearance project: determined protection requirements with the business side and the IT security officer, drew up the remediation roadmap and steered its implementation, prepared and coordinated the external audit and penetration test, and moderated the results workshops. Then planned and steered further measures to improve IT security long term. Clearance result: security rating "good", maximum risk level "low".
Technologies: ISMS · IT-Security · Formale Freigabeprozesse
Team size: >20
Designed and rolled out the ISMS across the organisation without external consultants, tailored to a multi-project organisation and SaaS operations, with change management in the individual projects. Result: TISAX label (AL2) with no major or minor nonconformities, maturity level 3 on 40 of 41 controls.
Technologies: ISMS · TISAX · Formale Freigabeprozesse · IT-Security
Team size: >20
Designed and implemented the test strategy (test case selection, quantity structure, load intervals); extended the existing test automation framework with load testing capability. Reused business test cases thus exercise the full processing chain rather than just the initial steps and uncovered hard-to-reproduce faults that would otherwise have surfaced only as sporadic failures in production. Result: empirically verified, right-sized Salesforce limits and MuleSoft configuration; internal faults and bottlenecks identified through the Salesforce and MuleSoft instrumentation.
Technologies: Salesforce · MuleSoft · EAI · ESB · Distributed Services · Python
Team size: >80
Reviewed the Salesforce template across the codebase, including code structure, patterns and anti-patterns, permission checks and test coverage. Derived refactoring guidelines and anchored them in workshops with the development teams.
Technologies: Salesforce · Patterns · Antipatterns · Clean Code · Code Refactoring · Architecture Refactoring
Team size: >80
Cross-department integration management across vehicle, backend systems, app and portal, spanning the first six vehicle launches: set up and moderated the coordination of the workstreams, consolidated test planning, test concepts and release schedules. Designed, introduced and trained project-wide test data management; gap analyses of test coverage and the concept for overarching non-functional testing. Result: on-time, on-quality delivery for the production launch.
Technologies: Testmanagement · Projektmanagement
Team size: >80
Led the rollout of the central system managing Connect customers' end-user contracts in the US market. Result: successful rollout.
Technologies: Projektmanagement
Led the sub-project rolling out user management as part of the Connect launch in China, with knowledge transfer to operations. Result: successful rollout.
Technologies: Projektmanagement
Authored the standards for specification and for documentation in the largest agile project in the company's history, with 400+ project members: transformed the existing waterfall standards for agile delivery while meeting group-wide requirements, handled rollout, analyst training and quality assurance. The uniform standards enabled substantial reuse between specification and documentation instead of duplicated work. Wrote the core business concepts for multi-tenancy and internationalisation. Result: standards set group-wide, used successfully in further projects for years.
Technologies: UML · Scrum
Team size: >400
Developed the business model as founder, designed the architecture and built the entire system single-handedly. It combined a web application for capturing receivables with a thick client for case handling, synchronised automatically. Pilot operation completed successfully; discontinued due to regulatory constraints.
Technologies: RCP · JFace · Spring · Tomcat · MySQL · DTAUS · MT940 · SEPA · OpenOffice.org · UNO · Java
Team size: 3
Steered alignment between business stakeholders (marketing, finance, sales), development teams and the UX/design and system architecture staff units as the business-integration function, consolidating business and technical architecture and requirements; prepared architecture and business context for operations and tracked correct, complete implementation. The ITPM documents of all workstreams were generated automatically from one consolidated document base. Result: 70% fewer document modules.
Technologies: UML · Scrum
Team size: >400
Led the eight-person development team alongside architecture and hands-on development. The new web portal makes the data warehouse's reporting and analytics functions accessible for funds and asset management, including the related workflows and documents. Established Scrum in the team. Exceptional stability and cruise speed through rigorous use of risk based testing, TDD and a high share of end-to-end tests.
Technologies: GWT · ExtGWT · Spring · Hibernate · Tomcat · Cubeware · Java
Team size: 8
Authored the architecture concept for the reporting/analytics web portal, evaluated technology alternatives and recommended tooling and development process. The recommendation then went into implementation.
Team size: 3
Analysed the status quo, determined the optimisation potential through extensive reports under high scalability requirements, and aligned implementation with the business side; restructured and migrated large data volumes. The resulting unloading and archiving process reduces the data volume continuously without impairing the many downstream processes.
Technologies: Asset Control · Jetty · Java · Solaris · Perl
Team size: 7
Technical project lead of a strategic project: put the standard tool for card data preparation on course for success in very short time by structuring goals and tasks clearly and sharpening unclear requirements, from requirements consolidation to production rollout, coordinated with parallel development projects. The tool prepares data for debit, credit and SIM cards and replaced numerous individual applications. Result: on-schedule go-live; synergies through components shared across projects.
Technologies: Glassfish · Web Services · J2EE · Java · OpenBP · MDA · Code-Generierung
Team size: 12
Accompanied the payment card rollout in the large cross-company loyalty programme across its full lifecycle: consolidated requirements with the business department, aligned changes with parallel development projects, designed and built new middle-tier and web-tier components.
Technologies: BEA WebLogic · WebWork · Spring · JSP · Hibernate · CoreMedia · Tomcat · Java
Team size: 10
Designed the three-tier architecture of the configuration management tool for complex simulation applications, coached the development team and developed the workflow meta-model with a nested, validating state machine.
Technologies: Spring · Hibernate · Tomcat · JSP · Java
Team size: 18
Project troubleshooting and completion of the real-time data plotter: ran the risk and effort analysis for the continuation decision, consolidated the requirements with the stakeholders, performed reengineering and refactoring in line with them, and built the missing functionality. The plotter renders simulation data in real time.
Technologies: Swing · Java2D · JFreeChart · Java
Team size: 18
Modelled the use cases and data model of the connected-engineering sub-project in UML, moderated the writing of the use-case descriptions. Developed an interactive GUI prototype to visualise for design engineers the complex selection logic behind populating the installation space. The prototype made the defined processes tangible for business departments and neighbouring sub-projects.
Technologies: UML · SAP iPPE · CATIA
Team size: >1000
Built the release management tool that implements the software rollout procedure per savings bank association specifications. It keeps a tamper-proof history of modules and versions, ties actions to the organisational position through per-version roles and adapts to new requirements through a hierarchical approval model.
Technologies: UML · Java · J2EE · Oracle · Borland Enterprise Server · Hibernate · Tomcat · Struts · Tiles · CVS
Team size: 4
Built the server-side OpenCms base module for the corporate website, connected to the product database. It assigns products to categories and divisions and automates quote requests.
Technologies: OpenCms · JSP · MySQL · Java
Team size: 3
Reorganised source code repositories of more than a million lines and coached an 18-person team in software engineering, refactoring and agile processes. Introduced a wiki for knowledge management and extended CVS with ACL-based access control including permission inheritance. The new structure enables granular assignment by confidentiality level; the ACL secures access.
Technologies: C · CVS · Wiki · Agile
Team size: 18
No standard system covered the requirements for workflow and individualised quoting: built the shop from scratch for the initial outfitting of all restaurants with the new apparel collection.
Technologies: Apache · HTML · JavaScript · Perl · CGI
Team size: 4
Built the web application for remote monitoring and administration of the ATMs. Defined and implemented the TCP/IP server and the XML interface.
Technologies: C++ · STL · WOSA/XFS · Wincor/Nixdorf ProTopas · J/XFS · Java · Zope · Python
Team size: 4
Built display components that decouple user interface and application code through a purpose-built event mechanism. Look and feel and UI parts can be defined and swapped entirely in HTML without touching the application code.
Technologies: C++ · STL · ATL · Win32
Team size: 4
Built the database and intranet application for product information and inventory used in communication with the international agencies, and advised the client's software team on web development and database design. Multi-stage data transformation simplifies adaptation to new requirements; generated pages transfer automatically from the protected intranet to the internet.
Technologies: Python · PostgreSQL · XML/XSLT
Team size: 4
Built the controlling application for a public-sector institution with 50+ facilities, based on a self-designed XML/XSLT framework. It comprises document management, accounting integration, ACL-based access control, reporting and workflow management.
Technologies: XML/XSLT · MS IIS · MS SQL Server · Visual Basic · VBScript
Team size: 6
Built components for the real-time presentation service, at times deputising as team lead. Architected, designed and built large parts of user management, internationalisation and the administration of presentations, participants and telephone conferences. Worked in an international team. The service enables browser- and platform-independent presentation and control of PowerPoint presentations over the internet, with application sharing, whiteboards and markup tools.
Technologies: UML · Java · J2EE · JSP · Solaris · Perl · JavaScript · DHTML
Team size: 19
Developed, coordinated and delivered an internet training programme, as team lead. The centrepiece was the Business Academy Web, a comprehensive programme training professional internet developers: from the technological foundations of the internet (network topology, routing, the OSI model) to web development technologies.
Technologies: Java · Perl · JavaScript · HTML · CGI
Team size: 5
Built major parts of the website, defined the interface between content management (Imperia) and shop system (Intershop) and implemented various parsers for data import. The automated data transfer transforms content from Imperia's hierarchical structure into Intershop's relational structure and back.
Technologies: Intershop · Imperia · Perl · JavaScript · HTML · CGI
Team size: 8
Programmed the server-side components of the website, including user authentication, personalised content, games, incentives and surveys.
Technologies: Perl · JavaScript · HTML · CGI
Team size: 4
Maintained and extended the marketing database on Access and Windows NT, and developed reports plus data import and export for various external systems.
Technologies: Microsoft Access · SQL · Windows NT
Team size: 4
Developed the system control software for measurement devices. The devices measure electrical and electromagnetic properties of toner.
Technologies: QuickBASIC
Team size: 6
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Start the AI readiness checkWhat I value most: Sebastian builds sustainable solutions tailored precisely to the organisation's needs. […] He cares more about anchoring solutions in the team, with clean documentation, knowledge transfer and pragmatic delivery, than about one-off execution. […] I recommend Sebastian without reservation for work that demands analytical thinking, delivery strength and lasting impact.
Add to that his deep understanding of complex digital ecosystems and his long experience. He tackled every task with commitment and foresight, and the results were consistently above average. What sets him apart most is his ability to lead at eye level.
His deep technical knowledge and sound judgment, combined with positive leadership and straightforward communication with stakeholders, consistently helped to turn complex visions into execution.
While the largest agile project in the company's history was still being set up, Mr Hoering developed the standards for business specification and documentation. […] Mr Hoering integrated two previously separate systems (Magic Draw and Confluence) into an end-to-end, largely automated process for modelling and delivering specification and documentation. Overall, the consultant's work enabled the project to set the BMW Group-wide standard for specification and documentation in agile projects.
His broad experience made it possible to combine the roles of project lead, client management and IT development in one person. At every stage from conception and design through implementation to operations, he was a guarantor of the high-quality solution.
LSE graduate and sociologist (LMU) who has been building software since 1997. That's why I think of every system as both: technology and organisation at once.
I sail and I surf: both teach you to work with what you have instead of waiting for perfect conditions.
I live in Munich and work remote or on site.
No obligation, straight to the point.
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