Sven Drewniok

Migrated a large volume of records from a legacy system: Migration completed without data loss

• Built a new microservice to replace the existing DB-trigger and batch logic
• Planned rollback and failure-handling paths for the migration
• Monitored the migration with custom metrics and a Grafana dashboard

Created shared tooling for starting new microservices: Standardizes service creation

• Supports various commonly used features such as Kafka, DB access, HTTP auth, etc.
• Made the template available to other teams for service creation and onboarding

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• Planned and executed migration while addressing breaking changes, outdated libraries, and internal dependencies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

Mentored junior developers and supported team development: Contributed to knowledge sharing and team cohesion during company growth

• Joined when the team had 4 members and stayed through its growth to approximately 20
• Mentored junior developers and onboarded new team members
• Worked in a fully remote team from its beginning

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