Sven Drewniok

Application Engineer: Contributed to order processing infrastructure and platform expansion

• Designed and developed microservices for order import using event-driven architecture with Kafka
• Built HTTP notification receiver with message conversion and downstream processing services
• Leveraged AI tools to accelerate learning of unfamiliar codebase and generate unit tests

Responsible for migrating multiple .NET services: Reduced technical debt, improved testability and long-term maintainability

• Migrated legacy .NET Framework codebase to modern .NET Core versions, up to .NET 8
• Planned and executed migration while addressing breaking changes, outdated libraries, and internal dependencies
• Refactored legacy code to enhance testability and maintainability

Technical lead for refactoring: Increased developer productivity, cleaner codebase, improved maintainability

• Analyzed and restructured software architecture to implement microservices
• Introduced Dependency Injection (DI) and educated the team on best practices
• Refactored large code segments independently; praised for clarity and maintainability

Technical owner for authentication/authorization: Future-proofed auth system with a better user experience

• Maintained, enhanced, and secured the existing IdentityServer v3-based auth server
• Upgraded to latest version, built user-friendly login UI with Vue.js
• Technical Owner for all authentication and authorization components
• Evaluated third-party alternatives due to user growth
• Implemented Auth0 prototypes for backend/frontend with flow configuration, cost analysis & budget planning

Responsible for logging strategy and telemetry setup: Faster error analysis, reduced debugging time, increased system transparency

• Unified various existing logging approaches into a central structured format
• Introduced OpenTelemetry for logs, metrics, distributed tracing
• Collected telemetry data using Loki, Prometheus, and Tempo
• Integrated all data into a central Grafana dashboard

DevOps Engineer / Infrastructure automation: Reproducible dev environments, stable CI/CD processes, cloud-native architecture

• Created production-ready Dockerfiles and Compose configs for local dev
• Integrated MSSQL, MongoDB, and Azure Storage Emulator into local containers
• Built Azure Container Registry (ACR) with automated GitHub Actions builds
• Collaborated closely with admin to scale and maintain containerized apps
• Participated in migration from VMs to Kubernetes (AKS)

Technical evaluator for AI integration: Basis for decision on supplementing/replacing existing classification logic

• Evaluated OpenAI / Azure OpenAI for project use
• Built prototypes and integrated with existing data structures
• Tested .NET Semantic Kernel
• Assessed potential to replace/enhance current Python-based classifier
• Estimated costs and created analysis report

Team member with focus on mentoring & culture development: Contributed to stable growth, knowledge sharing, team cohesion

• Early team member – grew from 4 to ~20 people
• Remote-first: 100% remote since day one
• Strong team integration, regular participation in team events
• Mentored junior developers and onboarded new team members

PHP Developer: Reduced ticket processing time, effective system integration

• Designed and developed an internal ticket system for the hosting and support department, including legacy data migration
• Maintained and extended existing PHP apps to optimize internal workflows
• Created responsive frontends using Vue.js
• Worked closely with departments to improve digital processes