Freelancer profile translated to English.

Description

Senior Software Engineer with 10+ years of experience, specializing in AWS serverless architecture and backend development. I help startups and SMEs build cloud systems that scale reliably – pragmatically, cost-consciously, and without over-engineering.

Typical services:

Serverless AWS Backends (Lambda, DynamoDB, API Gateway, SQS, SES) and Infrastructure as Code with AWS CDK

Backend services in Kotlin/Spring Boot and C#/.NET – microservices, event-driven systems (Kafka, including IoT data streams), clean API design
CI/CD, observability, and live operations for production-critical workloads, including on-call experience

A special feature is the depth across two backend worlds: JVM (Kotlin/Spring Boot) and .NET (C#), both on AWS – a combination that is less commonly found.

Additionally, I integrate AI into products – I integrate existing models and APIs (transcription, semantic search, image recognition) into runnable software in a way that creates robust, maintainable features, focusing on clean integration and the engineering around it rather than model development.

To put the experience in perspective: I scaled a game backend to 1 million daily active users, with only a few hours of downtime over 8+ months of live operation. Currently, I am building my own SaaS product end-to-end with ClipCatalog – backend, AWS infrastructure, and exactly these AI features. AWS Certified Solutions Architect – Associate (re-certification scheduled for 07/2026).

Typical projects: Greenfield APIs and serverless architectures, making existing services production-ready, cost and scaling optimization on AWS. 100% remote (EU time zones), 2-3 days/week.

If you are interested, I look forward to hearing from you.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Paulus Digital Solutions LLC
Backend & AWS Engineer · Solo Founder, ClipCatalog
SOFTWARE PUBLISHING
September 2025 - Today (11 months)
Conception and development of a Windows desktop application (Flutter) for semantic search and management of large video archives (clipcatalogpro.com).
Implementation of a serverless AWS backend (Lambda, DynamoDB, API Gateway, SES, SQS) for licensing, auth, and transactional email delivery
Development of the product website with Astro, delivered via S3/CloudFront
Connection and state synchronization of multiple external APIs (Paddle, Brevo, ZeroBounce) including incoming webhook processing
Integration of local AI models: semantic video and image search via embeddings and vector similarity, object detection, audio transcription, as well as face recognition and clustering
Setup of a fully agentic AI-supported development workflow with MCP integrations (Claude Code)

Technologies: AWS (Lambda, DynamoDB, API Gateway, SES, SQS, S3, CloudFront, CDK), Flutter, Dart, Astro, C#, Python, local AI models (transcription, semantic search, object and face recognition), third-party APIs (Paddle, Brevo, ZeroBounce), webhook processing for freelance mandates
AWS Flutter C# Python AI Integration
Sabbatical
Sabbatical
October 2023 - August 2025 (1 year and 10 months)
Planned professional break: a two-year overland trip through over 15 countries by motorhome – completely self-organized (visa and carnet coordination, vehicle import/export, spare parts procurement in remote regions, seasonal route planning across multiple climate zones).
RIO | The Logistics Flow
Software Developer
LOGISTICS AND SUPPLY CHAIN
August 2019 - September 2023 (4 years and 1 month)
Munich, Germany
Development of AWS cloud infrastructure as Infrastructure as Code with AWS CDK (TypeScript)
Design and maintenance of CI/CD pipelines for trunk-based development with multiple production deployments per day; automation of engineering workflows in Python
Observability and operations with Datadog
Development of microservices in Kotlin with Spring Boot following hexagonal architecture
Design of modern AWS cloud architectures and API design
IoT event processing with Apache Kafka
Occasional frontend contributions with React
Technologies: AWS (CDK, Lambda, ECS, S3, DynamoDB, API Gateway, CloudFront, WAF, IAM, CloudWatch, CodeBuild), Kotlin, Spring Boot, TypeScript, Python, Apache Kafka, Datadog, hexagonal architecture, microservices, trunk-based development, React
Kotlin Python AWS Microservices Typescript