Software developer & IT consultant
Benjamin Keffer.Ideas, turned into software.
I design and build digital products – from architecture to smooth delivery. With a clear focus on what clients actually need.
About
Benjamin Keffer
30 years old
Software Architect & Developer
A passionate software developer with a Bachelor's degree in Applied Computer Science and many years of professional experience – I turned my hobby into a profession. My expertise is building innovative solutions, from concept to smooth delivery. With a strong focus on client needs and efficient execution, I move projects forward. I'm a builder who rolls up his sleeves to ship great things – currently as Software Architect at EnBW, freelance for selected clients at Kaiserstuhl, and in cooperation with Flow-It Automation.
Years of experience
Based in Kaiserstuhl
Married
Father
Dog lover
Inline hockey
Tennis
Hiking
Toolkit
Tech Stack
My toolkit – curated, not collected.
C#
.NET
Delphi
gRPC
OAuth2
OpenTelemetry
Envoy
MySQL
MariaDB
PostgreSQL
Oracle SQL
Redis
Selection
Projects
A selection of recent work – from confidential enterprise platforms to brand websites.
- Confidential// management-dashboard2016 – present·Concept · Architecture · Lead development
Management Dashboard
KPI platform for a hospitality & entertainment resort
Concept and implementation of a KPI dashboard platform for the strategic management of a large hospitality and entertainment business. Heterogeneous data sources (ERP, hotel PMS, POS, external sales channels) are consolidated in real time and visualized in a cross-platform app.
- Bachelor thesis as foundation – evolved into a board-level platform
- Real-time aggregation across ERP, hotel PMS, POS and external sales channels
- Cross-platform apps (iOS, web, native) on a shared .NET API
- Role- and tenant-based model for strategic and operational views
.NETC#MicroservicesAzure DevOpsOracle SQLMS SQLPostgreSQLMySQLRESTSOAPiOSXamarin - Confidential// ticketing-backend2016 – present·Architect · Backend & APIs
Ticketing Backend
Microservices platform for ticket distribution & digital products
Microservices architecture as a central backend for the distribution of admission tickets and digital products. Integrated with point-of-sale systems, turnstiles, barriers, hotels, resorts and external sales channels. Foundation for digital products such as resort passes and multi-channel tickets.
- OAuth2-secured gRPC APIs behind an Envoy proxy
- OpenTelemetry pipeline for end-to-end tracing across 30+ services
- Integrated with POS, turnstiles, barriers, hotels and external sales channels
- Headless web storefront in Next.js on the same API
.NETC#Next.jsTypeScriptOAuth2MicroservicesDockerMariaDBOracle SQLRESTgRPCEnvoyOpenTelemetryAzureUbuntu 
2026·Concept · Design · DevelopmentEditorial website for “probably the smallest bakery in Germany” in Endingen am Kaiserstuhl. Four-generation storytelling, curated assortment of 90+ varieties, bread-sommelier area, donation breads and tasting events – calm typography, print-inspired.
- Storytelling across 4 generations, calm typography, print-inspired
- Assortment module with 90+ breads and rolls, categorized
- Bread-sommelier area for tastings and tasting events
Next.jsTypeScriptTailwindSanityVercel
Brand website for a brewery at Kaiserstuhl, served on an umlaut (IDN) domain. Product range, story and sales in a tone that matches traditional brewing craft.
- Umlaut domain (IDN/Punycode) configured cleanly
- Product range and story area with restrained imagery
Next.jsTypeScriptTailwindVercel
2026·Concept · Design · DevelopmentBrand presence for two farms in Dreisamtal and Hexental. Animal storytelling, farm-shop showcase, direct sales for meat boxes, potatoes and apple juice – grounded, warm and honest.
- Two farms – one brand, clearly separating dairy and pasture operations
- Direct sales for meat boxes, potatoes and apple juice
- Farm-shop module with opening hours and addresses
Next.jsTypeScriptTailwindVercel
2026·Consulting · FrontendWeb presence for an established law firm in Waldkirch (65+ years). Clear focus-area navigation across construction, insurance, commercial and corporate law; careers and client areas with current notices.
- Focus-area navigation across construction, insurance, commercial and corporate law
- Careers and client area with job postings
- Current notices, project archive
WordPressPHPCustom Theme
Cooperation
In cooperation with Flow-It Automation
Together we move organically grown Office processes from Excel, VBA, Word and Power BI into modern, maintainable software – pragmatic, incremental and without risky big-bang migrations. Design meets engineering precision.
Office modernization meets architecture – as a long-term tech partner.
Visit flow-it-up.de
Track record
Resume
Keffer Systementwicklungen
Freelancer · 2023 – heute
- Architecture and development of custom software solutions for selected clients at Kaiserstuhl
- Consulting on software architecture, cloud and engineering practices
EnBW Energie Baden-Württemberg AG
Software Architect, B2C Capabilities · 2023 – heute
- Architecture of B2C platforms for energy and smart-home products
- Cross-team collaboration between product, UX and engineering
- Technical strategy and tech-radar for capabilities
Europa-Park Freizeit- und Familienpark Mack KG
Software Developer & Deputy Director IT · 2018 – 2023
- Planning and execution of strategic IT projects
- Leading the IT department, offshoring to India
- Development of strategic and operational software
- Software architecture and database design
- Data analysis and KPI dashboards
Europa-Park Freizeit- und Familienpark Mack KG
Software Developer & Deputy Head of IT · 2015 – 2018
- Planning and execution of IT projects
- Continuous development of in-house systems
- Development of ticket vending machines and self-service
Contact
Say hello.
An idea, a project, a question? I usually reply within one business day.