Summary

Software engineer with five years of experience building and operating backend and full-stack systems, with deep hands-on expertise in enterprise billing and mediation for the telecom sector. Comfortable owning features end-to-end ? from requirements and architecture through backend, frontend, CI/CD and production operations. Strong in Java (Spring Boot, Vert.x), distributed data processing, cloud infrastructure and DevOps. Registered sole proprietor building and shipping independent products alongside employment.

Skills

• Backend ? Spring Boot, Vert.x, Laravel, REST APIs, high-throughput data processing / mediation
• Frontend ? React, TypeScript
• Infra & DevOps ? Docker, Kubernetes, CI/CD, Linux, cloud migration, self-hosted infrastructure, observability / monitoring
• Data ? PostgreSQL, relational databases, Oracle, reporting (Jasper)
• Practices ? SDLC ownership, system design, automation, production operations

Experience

03/2025 ? present

Role: Software Engineer & Consultant

Customer: NEWCON GmbH

Tasks:

Sole engineer end-to-end on multiple enterprise projects in the telecom billing domain ? two complete solutions delivered, a third shipping now, each owned from requirements and architecture through backend, frontend, deployment and ongoing support.

• Built a full web portal for uploading and managing telecom tariffs single-handedly ? backend, frontend, CI/CD and production rollout (delivered).
• Re-architected and cloudified a legacy enterprise application, deployed it on the client's infrastructure and provide ongoing production support ? improving reliability, scalability and maintainability (delivered).
• Rewriting an enterprise legacy Java Swing GUI application into a modern web application on Java 26: a configuration-driven framework where forms, menus and most business logic are generated dynamically from YAML config, database-agnostic across Oracle and PostgreSQL (in progress).
• Removed several thousand lines of redundant business-logic code through systematic refactoring, reducing maintenance complexity and speeding up core processing workflows.

Skills:

Java 26 / latest LTS, Spring Boot, TypeScript, Docker, Kubernetes, CI/CD.

05/2023 ? 02/2025

Role: Full-Stack Developer

Customer: Gentics Software GmbH

Tasks:

Full-stack development on a dynamic Content Management System serving production workloads.

• Built high-performance, scalable backend services primarily with Java (Vert.x).
• Developed and maintained web portals with PHP/Laravel and React/TypeScript for responsive, user friendly interfaces.
• Worked cross-functionally to ship features, optimize performance and resolve complex production issues.

Skills:

Java, Vert.x, PHP, Laravel, React, TypeScript.

11/2021 ? 04/2023

Role: Software Developer / Product Support

Customer: Lifebrain (Covid Labor) GmbH

Tasks:

Internal tooling, reporting and process automation for large-scale laboratory operations.

• Developed internal tools including an employee onboarding/offboarding portal.
• Built reporting and document generation (Jasper) for laboratory operations.
• Supported and delivered projects around the GLIMS lab information management system.
• Drove digitalization and automation of internal labor processes.

Skills:

Java, Spring Boot, Python, SQL.

Java Workflow / Mediation Engine(java, mediation, data processing)

Custom Java engine for configurable data-processing workflows, inspired by DigitalRoute Mediation Zone. Directly applies telecom mediation concepts ? collection, transformation and routing of high-volume records ? as a from-scratch, self-designed system.

Self-Hosted Infrastructure & Observability Platform (linux, docker, observability, hetzner)

Designed and operate a self-hosted server stack (Hetzner) with containerized deployment and full observability/monitoring ? end-to-end ownership of provisioning, deployment automation and reliability.

Online Auction Platform (saas, full-stack)

C2C online auction platform built as an independent SaaS product ? full-stack architecture, backend and infrastructure. Approved side business as a registered sole proprietor; product ownership from concept to launch.

Security / Bug Bounty (security, bug bounty)

Participant in the City of Vienna (Stadt Wien) bug bounty program ? 4 of 5 submitted vulnerability reports accepted. Also active on Immunefi and Bugcrowd.

Solana On-Chain Analytics (solana, indexing, backtesting)

Backend and on-chain data work in the Solana ecosystem: an own indexer, a year of aggregated launch/trade data, analytics and backtests ? written up on this site.