Hi, I'm David,

About Me

I am a fast learner and motivated person who grows constantly. I studied as a System Programmer at school. My hobbies include writing music, learning musical instruments, new technologies, penetration testing, game development and astronomy. I used to teach others in various topics. I like to throw myself into different projects for example Arduino, Raspberry and code different hardwares like motion detectors, humidity, temp sensors, IR camera systems, LED displays and so on. Lately with the new upcoming VR and AR technologies I started to develop my own VR projects and doing some freelance work for customers. Also I jumped into the latest AI technologies and LLMs, Text, Image, Sound generation and computation, and learning how to train them properly with LoRA models. You can find further information about me on my LinkedIn page; LinkedIn Profile Link

Education & Experience

For more information, have a look at my curriculum vitae .

  • Services4-IT July 2023 - July 2024
    Expert PostgreSQL Database Engineer
    PostgreSQL DB v11.x - v16.x+) Docker (image deployment, creation, upgrade) RedHat 7/8/9 Linux, Debian (bullseye, bookworm), CentOS 7/8, Alpine Git Gitlab (CI/CD) Virtualization Shell Script WAL-G Ansible, Ansible playbooks Incident, Change management Deployment of new containers Patching and everyday tasks VMware ESXi Vagrant AWS Ticketing Software; ARS, SNOW ITIL AGILE
  • Freelancer July 2021 - Present
    VR/XR Developer
    Unity 2019-2022 LTS Unreal Engine 5.x (beginner) C# (beginner) Blender (beginner) HLSL/GLSL Shader Coding Sound Design Optimizing Git / Github Trello
  • Deutsche Telekom IT Solutions HU Sep 2020 - Nov 2023
    Solution Engineer & Expert Database Admin
    PostgreSQL (PG 11.x - 14.x~) Linux (CentOS, RHEL, Debian) Patroni clustering and HA solutions Shell Scripts PgBackRest, pgBadger Nagios ITIL / AGILE SNOW SQL Patching and everyday tasks
  • DPDgroup IT Solutions Hungary Jan 2019 - Aug 2020
    Senior Database Expert
    PostgreSQL (PG 9.4-11.4) Oracle Database 12c MariaDB (and JIRA DB migration from PostgreSQL) Linux (CentOS, RHEL, Debian) Repmgr replication solutions Shell Scripts Nagios Atlassian JIRA / Confluence Teradata ITIL AGILE SQL DBSSQWARE management Auditing and migration Patching and everyday tasks Training colleagues How-To and Wiki documentation creation
  • HMEI Zrt. (Honvédelmi Minisztérium EI. Zrt.) Sep 2014 - Oct 2018
    Lead System Engineer
    Oracle Database (8i-12c) Linux (SUSE Linux Enterprise Edition, Debian) SAP BASIS (ABAP+Java Stack) HP Data Protector (10-10.01) VMware ESXi MSSQL 2012 (beginner) Windows Server 2012 (beginner) MaxDB (beginner) RMAN Grid/Cloud Control Shell Scripts Nagios + Scripts DB, OS, SAP - Patching and everyday tasks ITIL
  • Lufthansa Systems July 2008 - July 2014
    SAP/Linux/Database Administrator
    Flexframe (3.2-5.0) Oracle Database (8i-11g) Linux (SUSE Linux Enterprise Edition) SAP BASIS (ABAP+Java) MaxDB (beginner) RMAN Grid/Cloud Control Shell Scripts HP OpenView Enterprise Information Management Control/M Job Scheduler DB, OS, SAP - Patching and everyday tasks Service Center, SCOUT Leading shifts, teamleader Training colleagues
  • Getronics UK // Barclays Bank UK 2007 Jan - 2007 July
    2nd Level Tech Support in UK
    Tivoli Safeboot Exchange Admin MRAS AD Citrix Service Center

Skills and Technologies

Latest Technologies Used

List of technologies and tools I used in the last few years actively.

PostgreSQL DB v11.x - v16.x+ RedHat 7/8/9 Linux, Debian (bullseye, bookworm), CentOS 7/8, Alpine Shell Scripting Docker (image deployment, creation, upgrade) Vagrant Gitlab (CI/CD) Git VMWare ESXi Virtualization WAL-G AWS Ansible, Ansible playbooks Ticketing Software; ARS, SNOW AGILE Methodology ITIL Principles

Past Technologies Used

List of technologies and tools I used 3-5+ years ago for a very long time.

PostgreSQL 9x-16.x (replication, repmgr, pgbackrest, patroni, pgbadger, wal-g...) Oracle 8i-12c (RMAN, DG, ASM/FS, Physical Standby/RAC) + Exadata basics RedHat, CentOS, Debian, SLES, Alpine + Kali for troubleshooting SAP BASIS; Netweaver 700-740/4.6C MariaDB 10.3.2x Teradata Monitoring tools; Nagios/Thrusk, Cloud/Grid Control, HP OpenView, Control/M, DBSQWARE, PMS, Wobbler Ticket management tools; JIRA, SCOUT, SNOW, ARS, Service Center/Manager and companies own made ticket handlers VMware ESXi VSphere (6.5) Docker Vagrant HP DataProtector (v10.00-v10.02) OpenText (v9.6.x-v9.7.1) awk SQL Fujitsu FlexFrame 3.2/5.0 HP Proliant DL360 in NATO SDIP-27 Certified TEMPEST environment Git Gitlab ITIL AGILE MS SQL 2012 DB2 MaxDB 7.6 Sybase AIX

Languages

Hungarian - Native English - Professional proficiency (C1) German - Basic (B1)

Contact

Feel free to contact me for my services or for further information with the following contacts below.