Business analysis
Turning a tangled business problem into a clear, decidable model — stakeholders, processes, constraints and the real questions underneath the stated ones.
Independent · DACH
Senior engineering judgment for complex enterprise programs.
I am Stefan Hoelz — an independent business analyst, requirements engineer and software developer. For more than three decades I have helped large organisations understand, specify and build the systems their programs depend on.
About
Three companies built, two decades inside the enterprise.
I founded my first company, SATIC GmbH, in 1990, delivering large IT systems around Frankfurt Airport through the decade. In 2003 I founded Airbiz GmbH and built FlightVision, an airport-operations platform. The product worked; the company did not survive 2011 — and understanding precisely why has shaped how I approach every system I have touched since.
For the years that followed I worked as a senior independent systems and requirements engineer inside some of the most demanding programs in the German-speaking market: train IT for Alstom, exchange and market-data systems for Deutsche Börse, system-transformation tendering for Fraport, and programs for Lufthansa and the federal IT service ITZBund. I hold a Diplom in Computer Science (Informatik) from TU Darmstadt.
Today I work as a one-person practice, amplified by a supervised AI toolchain — with personal accountability for every deliverable, regardless of how it was produced.
What I do
Expert capacity, not a product.
Enterprises bring me in when a program needs senior analysis and engineering faster than they can hire it — and needs it to be right the first time. Three things, done at depth:
Requirements engineering
Specifications that survive contact with procurement, architecture and delivery: complete, testable, traceable, and written so engineers and auditors read them the same way.
Individual software development
Building the system itself where bespoke work is warranted — pragmatic, maintainable, and accountable to the requirements it was specified against.
Selected programs
Where the work has held up.
A representative cross-section of senior mandates delivered for enterprise clients and their framework partners across the DACH region.
AlstomRail · On-board systems
Requirements and systems engineering for train IT — on-board internet, CCTV and passenger-information systems — within a large rolling-stock program.
Deutsche BörseCapital markets · Real-time
Analysis and engineering on exchange systems and real-time market data, including the retrofit of core trading infrastructure for the DAX market.
FraportAviation · Procurement
Analysis of a major system-transformation tender — translating operational reality into the requirements and evaluation criteria a multi-year procurement could stand on.
LufthansaAviation · Operations
Multi-year senior consulting across operational IT programs for one of Europe's largest airline groups.
ITZBundPublic sector · Federal IT
Requirements and systems-engineering work within the German federal government's central IT service provider.
Engagement
How working together looks.
Who I work with
Large enterprises in the DACH region running complex programs — directly, or placed through their framework and staffing partners (e.g. Randstad, Hays, GULP).
Commercials
Day rate or fixed work package, per your procurement framework and under German-law contracting. No price list — scope sets the shape.
Where & how
Remote and on-site across the DACH region, in German or English. Comfortable inside established program governance, toolchains and audit requirements.
Availability
A deliberately small number of concurrent engagements, so each one gets senior attention. When I am at capacity I will say so — and refer on where I can.
Contact
Looking me up for a mandate?
If you are a client or program lead with a fitting program, or a recruiter with a mandate that matches, write to me directly or use the form below. Either reaches my inbox — I read it myself.
hello@stefanhoelz.com