Sören Straßmann

• 01

  Consulting

  Technology choices, code reviews and usability: a second look at architecture and interface before decisions get expensive.

  • Architecture
  • UX
• 02

  Web applications

  From the Angular frontend through the Spring Boot backend to the PostgreSQL database. One person for every layer.

  • Angular
  • TypeScript
  • Spring Boot
  • PostgreSQL
• 03

  Operations

  Test, stage and production systems on Linux, automated with Jenkins, with TLS, backups and updates. That is how coachingspace.net has run since 2020.

  • Linux
  • nginx
  • Jenkins
  • TLS
• 04

  Self-hosting

  Forgejo for Git and Seafile for files on your own server, for teams that would rather not keep code and data with the big providers.

  • Forgejo
  • Seafile
  • Backups
• 05

  Monitoring

  Metrics with Prometheus and Grafana, logs with Graylog. See problems before anyone reports them.

  • Prometheus
  • Grafana
  • Graylog
• 06

  Integrations

  REST APIs and webhooks to services such as HubSpot, Tickettailor, Whereby or FriendlyCaptcha.

  • REST
  • Webhooks
• 07

  Online marketing

  Newsletters planned and sent, landing pages built to turn visitors into enquiries.

  • Newsletter
  • Landing pages
• 08

  Tracking and analytics

  Google Tag Manager set up cleanly, Google Analytics read properly, and Search Console to see how people find your pages. Measure what a campaign actually brings in.

  • GTM
  • Google Analytics
  • Search Console
• 09

  AI consulting and setup

  I show you where AI actually saves your team time and set it up: with Claude, or with Mistral, the open-source model from France.

  • Claude
  • Mistral
  • Open Source
• 10

  Digital sovereignty

  No software from Microsoft or US corporations. Everything I use is open source or comes from vendors based in Germany.

  • Open Source
  • Made in Germany

Since 2020 · development, operations, monitoring

coachingspace.net

Online coaching platform with video conferencing, digital methods and client management. Whiteboard in fabric.js, 3D constellation board in Babylon.js.

• Angular
• Spring Boot
• PostgreSQL
• Babylon.js
• fabric.js
• Jitsi

Visit coachingspace.net ↗

Since 2026 · design and development

Dealphin

Mail-first CRM for small teams: shared and personal inboxes, contacts, appointment booking over CalDAV, forms, landing pages and newsletters with double opt-in. Self-hosted on a server in Germany, with no US services.

• Angular
• Spring Boot
• PostgreSQL
• Radicale
• IMAP

Visit dealphin.eu ↗

2020 · design and development

ISHyou

CRM/ERP system for an institute for school development and higher-education didactics: orders, clients, invoices and applications in one web application, plus domains, mail servers and websites.

• Web application
• CRM
• ERP
• Invoicing

More work

• Forgejo and SeafileGit and file hosting on own serversongoing
• Jitsi and TURNVideo conferencing infrastructure for coachingspace.net2020
• Monitoring stackPrometheus, Grafana and Graylog for test, stage and productionsince 2020
• Master’s thesisUsability of Microsoft Dynamics NAV on mobile devices2017
• ERP-Systeme anpassenBook on customising ERP systems, with Hesseler and Rösel2015
• Bachelor’s thesisSharePoint client for Microsoft Dynamics NAV 20132013