Freelancer profile translated to English.

Description

Software engineer with over ten years of experience in Java backend development and more than five years in iOS development (Swift, Objective-C). Profound knowledge of modern software architectures (especially Clean/Hexagonal Architecture), API design (OpenAPI), as well as agile development processes and CI/CD pipelines.

Current focus is on cloud-native backend solutions with AWS Serverless (Lambda, API Gateway, DynamoDB) and AI-assisted Development under clearly defined architectural guardrails. AI is used specifically as a tool to increase efficiency – not as a replacement for sound software development.

Key areas include:

clear system architecture and loose coupling
defined interfaces and invariants
deterministic and testable processes
controlled use of AI within stable system boundaries

Claude Code is used in a structured manner (Skills, Rules, Plugins, Subagents) to accelerate and support development processes. However, the functional and technical responsibility consciously remains with the developer: code is validated, critically reviewed, and refined manually if necessary.

The goal is sustainable, maintainable, and comprehensible solutions – with AI as a supporting tool, not as a black box.

Languages

German
Native or bilingual
French
Fluent
Spanish
Conversational
English
Fluent

Workplace preferences

Can work on-site

Langenfeld (up to 50km)

Selbstständig
Own Product (AI-assisted Coding / Solo Product Development)
January 2026 - Today (5 months)
Munich, Germany
Conception and implementation of a cloud-native backend system; currently migrating an existing Python backend to Java / Spring Boot 3.x based on Clean and Hexagonal Architecture principles.
Use of AI-assisted development workflows for analysis, code migration, and documentation under defined architectural and quality guardrails.
Development of a structured AI-coding framework with documented skills, project rules, and Markdown-based architecture guidelines for reproducible support by AI Agents.
Definition of clear engineering guardrails (Requirements, Coding Guidelines, Design Patterns, Architecture Principles) for the controlled and quality-assured use of AI-assisted development.
Setup of an AWS Serverless architecture with Lambda, API Gateway, DynamoDB, and Cognito.
Development of a monetization and entitlement system for subscriptions and credit models, including refill logic and status management.
Security through JWT/Cognito authentication, OpenAPI contract design, and automated unit, integration, and smoke tests.
Java Spring Boot Amazon Web Services (AWS) serverless-computing
Faktor Zehn GmbH,
Senior Developer
BANKING AND INSURANCE
March 2024 - August 2024 (5 months)
Munich, Germany
Development and optimization of a web-based quotation and application system for industrial insurance – GUI for policy issuance of an industrial liability insurance.
Implementation of product models for the representation of insurance products and tariffs.
front-end-interface-development backend-service-development external-api-integration linkki Faktor-IPS
Xempus AG,
Senior Software Engineer
BANKING AND INSURANCE
April 2023 - July 2023 (3 months)
Munich, Germany
Development and integration of interfaces for connecting insurance companies to the Xempus platform, a digital solution for managing occupational pensions.
Data processing and analysis: collection, preparation, and export of data into Salesforce CRM and relational databases for visualization of insurance transactions.
Java Spring Boot Apache Kafka backend-service-development external-api-integration