Abbas Hoseiny

Building systems and finding gaps.

I design and build systems as a whole: concept and architecture, backend and database, web interface, Android and iOS apps, integration of devices such as NFC readers and company phones, through to servers, backups and operations. One example is a multilingual employee platform with offline-capable time tracking, reporting and team chat that I designed, built and run. I also ship my own apps on the App Store. In parallel, I examine messengers and other widely used software for vulnerabilities and report them through national CERTs.

Understanding first, implementation AI-assisted.

My focus is on understanding: grasping the concept, defining the architecture and keeping the overview. The implementation, from code to writing to research, I do consistently AI-assisted, which makes me considerably faster at explaining, answering and building. Every result I verify, understand and take responsibility for myself.

Experience, certifications, skills.

Experience

• since 06/2026
  IT support (part-time) · Pestalozzi Gemüsebau GmbH. Building and operating the PKD employee platform, setting up and supporting company phones, creating and training users, updates and backups.
• since 08/2019
  Horticulturist, vegetable cultivation (full-time) · Christian Bärthele Bio-Jungpflanzen GmbH & Co. KG.

IT projects

• since 04/2025
  PKD, employee platform of Pestalozzi Gemüsebau GmbH: concept, build and operation. For seasonal and permanent staff, foremen, office and management; German, Polish, Ukrainian and Romanian; web, Android and iOS app. Time tracking via NFC chip or QR code, also offline; timesheets with approval; reconciliation with the existing payroll software. Performance overview per employee and activity, export to Excel and PDF. Team chat with voice messages, calls, push notifications, mailbox with tickets. Company phones in kiosk mode, scripted setup, staged updates. Servers, daily backups, standby server with an emergency handbook.
• since 04/2025
  Digitale PSM, free web app for calculating and documenting plant-protection applications (digitale-psm.de), MIT licence, source code on GitHub. Data storage with SQLite over WebAssembly in the browser, data kept as a file with the user, works offline; own pipeline for the official BVL approval data. Technical details.
• since 09/2026
  PDF On, my own iOS app (PDF scanner and editor), on the App Store.

Certifications

Cisco and CompTIA issue these credentials through Credly, where each one can be verified: see all credentials.

• 05/2026
  Cisco Certified Support Technician (CCST) Cybersecurity

  Verify on Credlyvalid until 05/2031
• 05/2026
  Cisco Certified Support Technician (CCST) Networking

  Verify on Credlyvalid until 05/2031
• 04/2026
  CompTIA Network+ (N10-009)

  Verify on Credlyvalid until 04/2029
• 04/2026
  CompTIA IT Operations Specialist (CIOS), combining A+ and Network+

  Verify on Credlyvalid until 04/2029
• 04/2026
  CompTIA A+

  Verify on Credlyvalid until 04/2029
• in preparation
  Cisco CCNA (200-301)

IT skills

Education

• 09/2016 – 07/2019
  Apprenticeship as horticulturist, vegetable cultivation · Pestalozzi Demeter Gärtnerei (today Pestalozzi Gemüsebau GmbH); vocational school. Completed 07/2019.
• 10/2017 – 02/2018
  German course B2 · adult education centre
• 01/2016 – 08/2016
  VAB-O · Dr. Erich Fischer Schule

Languages

Dari/Persian (native) · German (fluent, spoken and written) · English (B1, confident with technical texts)