# Oleksandr Turevskiy

> Backend and platform architect, based near Düsseldorf, Germany. 25 years in software.
> Kubernetes, Go and applied AI. Hands-on: owns platforms, writes the code. German citizen.
> Contact: me@turevskiy.com · https://turevskiy.com

## Current work

- **Mira GmbH (Rheinmetall Group)** — Senior Backend Developer, 07.2024–present.
  Owns the Ansible-driven edge fleet-management platform for a supervised-autonomy
  programme: device registry and discovery, role-based access, maintenance windows,
  configuration drift, compliance reporting, container and supply-chain security.
  Runs a 50-device production fleet, validated against 1,000+ simulated devices.
  484 of its 516 commits. Trivy and Grype against CycloneDX SBOMs are wired into the
  GitHub and GitLab pipelines alongside Dockerised integration tests, so security,
  quality and compliance issues surface at build time rather than as customer-facing
  incidents.
  Owns the Helm/Helmwave delivery layer shipping to development, production and
  four customer-specific environments, each with its own requirements (428 of 971 commits). Owns common-go, the shared Go
  library every service builds on — generics-based message envelopes, OpenTelemetry,
  RabbitMQ (159 of 172 commits). Proposed, designed and wrote the fleet simulation
  platform on his own initiative (176 of 179 commits). It proved the messaging,
  monitoring and control architecture holds at 1,000+ virtual devices — twenty times
  the production fleet — and reproduces scenarios impractical to stage with real
  vehicles, crash conditions among them. Built the in-app AI assistant:
  device actions gated behind a confirmation step, answers grounded strictly in
  product help content, every figure computed server-side from role-scoped endpoints
  rather than generated by the model.

- **Twelvegrow** — Senior Backend Engineer, freelance and parallel, 03.2025–present.
  Core Go services and the gRPC/protobuf contracts between them; cash-flow modelling
  and installment scheduling across both React front ends; BigQuery and dbt over
  banking data; EKS infrastructure in Terraform; document and email intake with
  Anthropic-backed structured extraction, including a prompt fallback for when
  constrained decoding fails. 1,100+ commits across 27 services.

## Earlier

Galeria Karstadt Kaufhof (web-shop in-housing) · Nylas (communication-data sync) ·
JoinClap (Backend Architect, Go/Couchbase on ) · ControlExpert · VMRay (cloud
malware analysis) · MySupermarket · SeeYourTravel (CTO) · Itera (Technical Lead) ·
Infopulse (Development Lead, Bosch Security Systems).

## Skills

- Languages: Go, Rust, TypeScript/JavaScript, Python, C#, SQL, Swift
- AI/LLM: grounded assistants, structured extraction against JSON schemas, prompt
  fallback for constrained-decoding failures, response caching, streaming, RAG,
  vector search, local inference (Ollama), MCP servers, agent skills
- Infrastructure as Code: Ansible, Terraform, Helm/Helmwave, GitOps, Argo
- Platform: Kubernetes, Docker, AWS (EKS), Google Cloud, Microsoft Azure, gRPC, RabbitMQ/AMQP, OpenTelemetry,
  Prometheus/Grafana/Loki, Trivy, Grype, CycloneDX SBOM, CircleCI
- Web & Mobile: React, Next.js, Vue/Nuxt, SwiftUI, WidgetKit, ActivityKit,
  Capacitor, Three.js/WebGL
- Data: PostgreSQL, MS SQL Server, MongoDB, Couchbase, Elasticsearch, BigQuery, dbt

## Certifications

- iSAQB CPSA-F — Software Architecture, Foundation Level (Nov 2025)
- CKAD — Certified Kubernetes Application Developer (Jun 2024)
- AWS Certified Developer – Associate (Oct 2023)
- AWS Certified Solutions Architect – Associate (May 2023)
- HashiCorp Certified: Terraform Associate (Mar 2023)
- Verify: https://www.credly.com/users/alex-turevski/badges

## Independent projects

- [5001 Words](https://apps.apple.com/app/id6784747555): SwiftUI vocabulary trainer
  for iPhone, iPad and Apple Watch plus a native Android build. 290+ decks across 84 languages, neural-voice pronunciation, range-fetched downloadable packs.
- [5001 Tomatoes](https://apps.apple.com/app/id6753728553): SwiftUI interval timer.
  Live Activities, widgets, 76+ locales, data never leaves the device.
- [5001 Axolotls](https://apps.apple.com/app/id6813990177): Three.js/WebGL multiplayer
  game. Node server and browser client import the same rendering-free simulation
  module, so multiplay is server-authoritative with no second implementation.
  Identity is a SHA-256 proof-of-work — no email, no password, no free text.
- [just-another-vpn-server](https://github.com/oltur/just-another-vpn-server): an
  OpenVPN-protocol server in Rust written from the wire format up. TLS control
  channel, AES-256-GCM data channel, rekeying, tls-crypt, NAT, IPv6-in-tunnel.
  A stock openvpn client connects unmodified; verified against OpenVPN 2.6.14.
  Story: https://turevskiy.com/blog/fed-up-with-vpn-providers-i-wrote-my-own-server/
- [SeeYourTravel](https://seeyourtravel.app): travel-community product built as CTO
  in 2015, brought back in 2026 — containerised behind a Cloudflare Tunnel with no
  inbound ports open.

## Languages

English (fluent) · German (advanced) · Ukrainian (native) · Spanish, Hebrew (beginner)

## Writing

- [Blog](https://turevskiy.com/blog/): engineering notebook kept since 2006.
- [All posts with summaries and topics](https://turevskiy.com/blog/llms.txt)
- [Rebuilding this site in an evening](https://turevskiy.com/blog/rebuilding-this-site-in-an-evening/)

## Availability

Not seeking employment. Keeps a few hours a month for pro bono work with non-profits,
volunteer organisations and open-source projects — architecture review, Kubernetes
and deployment, or a second opinion on where AI does and does not belong in a product.