Axel Hoffmann

Designed and built a component-based TypeScript framework for developing digital twin applications, structured as a layered pnpm monorepo (seven packages) with strict dependency rules and no circular dependencies.

The framework exposes a clean component model: cron-scheduled Collectors that fetch data from external APIs, Harvesters that transform it through dependency-aware pipelines, custom HTTP Handlers, and Asset Managers handling file CRUD with presigned S3 uploads for large payloads. Background processing runs on BullMQ with Redis for reliability.

Built with strong abstractions throughout: a database layer over Kysely/Knex (PostgreSQL and SQLite), a storage layer (local filesystem and OVH S3), and pluggable authentication (API gateway, JWT, or disabled). The engine ships with Kubernetes-ready health checks, automatic OpenAPI generation, graceful shutdown, and CLI scaffolding tools to generate new components. TypeScript 5.8+, Node 20+.

• Designed and built SPARC, a multi-tenant IoT platform using a hexagonal Rust architecture (Axum, NATS JetStream, TimescaleDB) for real-time ingestion and processing of sensor data.

• Integrated LoRaWAN through ChirpStack and implemented OIDC identity federation (Authentik) with a multi-tenant authorization model.

• Shipped cloud-native deployments on OKD using GitOps (ArgoCD, Tekton, Kustomize) with automated TLS certificate management via an internal PKI.

• Built and shipped web platforms for university research teams (Tandem, IRIS, Infofin) using AdonisJS and Laravel, from database design to production deployment.