Alexander Gellert portrait

Resume

Alexander Gellert
Contact
Alexander Gellert portrait

Available for opportunities

Alexander Gellert

Full-Stack Developer & DevOps Engineer · IT Security Enthusiast

Full-stack and DevOps engineer with 5+ years on Appway and 5+ years in finance (AML/KYC). I build secure, pragmatic solutions and prefer the KISS principle over complexity.

Email me

Career

Experience

Impactful roles & highlights
  1. 07/2024 - Now

    Freelance Security Researcher & Bug Bounty Hunter · Remote

    Freelance security research, bug bounty hunting and small security-focused development projects.

    Web Security Bug Bounty Linux
    • Perform security testing of web applications in public and private bug bounty programs
    • Focus on practical vulnerabilities such as XSS, authentication issues, misconfigurations and access control
    • Develop small tools and scripts to automate recon and repeatable test workflows
    • Document findings with clear proof-of-concept steps and remediation guidance
    Active in bug bounty and security research since 07/2024 alongside full-time role
  2. 03/2023 - Now

    IT-Service Owner, Senior Consultant, ixtrac · Zug, Switzerland

    IT service owner and senior consultant for Appway Platform 10/11 with strong DevOps focus.

    Appway Octopus Linux
    • Owned lifecycle of Appway servers and application stacks across environments
    • Designed and maintained Octopus pipelines for automated, repeatable deployments
    • Provided L3 support with deep technical analysis and incident response
    • Partnered with business and compliance on KYC workflows in finance and banking
    Reduced deployment time by ~30% through pipeline automation
  3. 02/2020 – 11/2022

    Application Specialist, Julius Baer (RM IT) · Zurich, Switzerland

    Application specialist and DevOps engineer on Appway Platform 9–11 in a private banking environment.

    Appway Automation Testing
    • Supported operational management with monitoring tools and automation
    • Enhanced testing team performance by introducing automation and better tooling
    • Combined technical analysis with business know-how to solve complex issues
    • Maintained two critical KYC and AML applications in finance and banking
  4. 02/2018 – 01/2020

    IT-Consultant, Syncordis (Nielsen+Partner) · Zurich, Switzerland

    IT consultant and software engineer on Appway Platform 6–8 for international banking clients.

    Appway Cloud
    • Created a flexible, cloud-ready Appway template reused across projects
    • Delivered four KYC and AML onboarding applications in finance and banking
  5. 05/2017 – 01/2018

    Student assistant, NTNU · Trondheim, Norway

    Student assistant for COINS – Institute of Computer and Information Security.

    WordPress Plugins
    • Maintained and customized WordPress sites, developed plugins, and supported daily IT operations
  6. 03/2016 – 08/2016

    Student assistant software developer, AAC Infotray AG · Winterthur, Switzerland

    Student software developer and IT consultant.

    • Designed a concept for automated GUI testing
    • Integrated external systems and applications into existing workflows
    • Implemented features for image editing, barcode recognition, and automated testing

Showreel

Projects

Selected work with stack highlights
KYC Workflow Accelerator thumbnail
2024 Internal

KYC Workflow Accelerator

Reusable Appway template to onboard KYC flows faster with guardrails, audit trails, and deployment automation.

Appway Java PostgreSQL Octopus
SecOps Lab thumbnail
2023 Personal

SecOps Lab

Home lab for security research with automated patching, centralized logging, and network segmentation.

Docker Ansible Traefik WireGuard
Secure Deployment Vault thumbnail
2024 Personal

Secure Deployment Vault

Self-hosted vault and PKI setup for secure secrets management, environment separation and hardened CI/CD deployments.

Vault PKI Docker Linux Octopus
Nextcloud Apps & Extensions thumbnail
2023 Personal

Nextcloud Apps & Extensions

Development of custom Nextcloud apps and integrations for secure file sharing, backups and homelab automation.

Nextcloud PHP Docker Nginx
Applied Bug Bounty Research thumbnail
2024 Personal

Applied Bug Bounty Research

Systematic security testing of web applications with focus on XSS, access control, misconfigurations and automation of recon workflows.

Burp Suite Linux Python Browser DevTools

Strengths

Skills

Tools, stacks, specialties
Framework
Appway
jQuery
EJS
Spring Boot
AngularJS
System
Docker
Octopus Deploy
Linux (Ubuntu/Debian)
AWS
CI/CD
Synology
Debian
Software & Tools
Synology
Nextcloud
Arris
Certificates
CompTIA Security+
Fit for Finance
Offensive Security Wireless Professional (OSWP)
Languages
Python
JavaScript
Java
C / C++ / C#

Learning

Education

2013 – 2017

B.Sc. in Business Informatics, HTWG Konstanz – University of Applied Sciences

Focus: software engineering, architecture, QA, web technologies, information security

2011 – 2013

College degree: Assistant for Information and Telecommunication Technology

Vocational school for IT assistants

Beyond work

Interests

Sports
Triathlon Muay Thai Ultra Trailrunning
IT Security Research
Privacy Mobile Homelab & home network
Reading
Finance Ethical Hacking
Email Call Meet