Senior .NET & Data Engineer · Athens, Greece
I build production-grade .NET platforms — data pipelines, multi-tenant SaaS, ML systems, and native Windows apps — with the full HA infrastructure behind them.
📇 Portfolio index · 💼 LinkedIn · ✉️ Email
I design and ship end-to-end .NET / C# systems on production-grade infrastructure — SQL Server Always On, Kafka, StarRocks, ClickHouse, Percona MySQL, Kubernetes, Docker Swarm, HashiCorp Nomad/Consul/Vault — with full observability and documented runbooks.
The work is organised as the NexusPlatform portfolio: 13 application projects, 2 infrastructure repositories, and a 4-app native Windows suite, each built to senior-engineer standards. See the portfolio index for the complete project grid with live status.
Phase 0 — Foundation Setting up the presentation layer, the first public repositories, and the portfolio website shell. First flagship project (
nexus-cli) is next.
Projects will appear here as they reach portfolio-ready status. Pinned row (planned):
| Project | What it is |
|---|---|
portfolio-index |
Skills matrix + living project grid — start here |
nexus-cli (coming soon) |
.NET 10 Native AOT CLI — single-binary infrastructure control |
portfolio (coming soon) |
Blazor Server portfolio website — the site that lists everything else |
dataflow-studio (coming soon) |
SQL Server CDC → Kafka → StarRocks + ClickHouse data platform |
sentinelml (coming soon) |
Fraud/anomaly ML with automated drift-triggered retraining |
nexus-platform (coming soon) |
Microservices reference — gRPC + Kafka + REST, sagas, K8s-ready |
● .NET 10 / C# 13 · ASP.NET Core · Blazor Server · gRPC · Native AOT
● Kafka (KRaft, Streams, ksqlDB, Debezium, MirrorMaker 2) · Schema Registry
● SQL Server Always On · Percona MySQL PXC · PostgreSQL Patroni · MongoDB RS
● StarRocks · ClickHouse · Redis Cluster · Kimball modelling · SCD2
● ML.NET · ONNX · PyTorch→ONNX · Semantic Kernel · Ollama · HuggingFace
● Docker Swarm · HashiCorp Nomad · Consul · Vault · Kubernetes · Terraform · Packer
● OpenTelemetry · Prometheus · Grafana · Jaeger · Seq
● Windows Forms · WPF · WinUI 3 · MAUI · MVVM · ReactiveUI
Full matrix with project mapping: portfolio-index/PORTFOLIO.md.
- Email:
gzapas@gmail.com - LinkedIn:
https://www.linkedin.com/in/grigoris-zapantis-1a0638b/ - Upwork:
https://www.upwork.com/freelancers/~01de3f0552684544ee - CV:
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