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Novian Works · Oslo

Event-driven .NET systems, built to stay up.

I’m Onur Gümüş. For 20+ years I’ve built distributed systems, from border control at Dubai Airports to the People Card in Microsoft Teams. Through Novian Works I share what I’ve learned about CQRS, event sourcing and the actor model.

Get in touch onur@novian.works
  • 20+ years building distributed systems
  • Millions of passengers a year through the Dubai Airports smart gates
  • 100M+ users of the People Card in Teams & Outlook
  • 5 published titles on .NET: a book and four video courses

Expertise

What I do

Architecture reviews to find the risks, hands-on delivery to fix them, and workshops so a team owns the result.

01

Architecture review

A second pair of eyes on an event-driven system, before a wrong decision becomes expensive to undo.

  • Aggregate boundaries and the domain model
  • Consistency, ordering and failure modes
  • Read models, projections and read-your-writes
  • Written findings with a prioritised plan
02

Design & delivery

Building alongside the team, pairing as we go, so the knowledge stays once the system ships.

  • CQRS and event sourcing in C# or F#
  • Sagas for workflows that span services
  • Akka.NET actors and clustering
  • Kubernetes deployment and observability
03

Team workshops

The hands-on Functional CQRS workshop from DDD Europe, tailored to a team’s own domain.

  • Commands → events → read models, built live
  • A cross-aggregate saga as the finale
  • Ready-to-run skeleton, no setup time lost
  • In C# or F#

See the reference app

Case studies

Systems people rely on every day

Emaratech · Dubai · 2017–2020 · Lead Software Engineer

Biometric smart gates at Dubai Airports

Context
Automated border control: passengers verified biometrically and cleared at the gate, with no room for downtime.
What I did
Architected the Akka.NET platform behind the gates.

Millions of passengers a year

Zero unplanned downtime

Akka.NET.NETactor model

Khaleej Times: Dubai’s Smart Gates explained

The Microsoft 365 profile card in Outlook on the web
image: Microsoft

Microsoft · Oslo · 2021–2024 · Senior Software Engineer

Live People Card in Teams and Outlook

Context
The profile card that opens when you hover a person, live across Teams and Outlook.
What I did
Built the Live People Card with React, TypeScript and Web Components.

100M+ users across Teams and Outlook

ReactTypeScriptWeb Components

Resoptima (Halliburton) · Oslo · 2024–2026 · Senior Software Engineer

Reservoir-modelling data pipeline

Context
Getting messy real-world data into ResX, a reservoir-modelling platform, reliably.
What I did
F# microservices for the ingestion pipeline on Kubernetes, including AI-based correction of malformed data.

F#KubernetesAI

Open source & products

Things I build in the open

open-source framework

FCQRS

CQRS and event sourcing for .NET on Akka.NET. Aggregates, sagas and projections with read-your-writes out of the box, idiomatic in both C# and F#. On NuGet.

  • Sagas that survive crashes and resume where they left off
  • Atomic multi-event writes
  • Per-aggregate snapshot policies
  • One-line OpenTelemetry: a whole workflow as one trace
  • SQLite, SQL Server, PostgreSQL, MySQL, Oracle and more

source ↗ docs ↗

reference apps

focument

One event-sourced system written twice, in C# 15 with union types and in idiomatic F#.

C# ↗ F# ↗

product · logistics SaaS

3dpack.ing

AI load planning. Describe a shipment in plain language, get a 3D packing plan with centre of gravity and stacking handled.

3dpack.ing ↗

product · learning platform

Nemorize

Spaced-repetition courses people actually finish. Free for individuals, on web and mobile.

nemorize.com ↗

open-source contributions

F# ecosystem

Proposed and implemented Async.StartImmediateAsTask in FSharp.Core (RFC FS-1028). Also Fable, FSharp.Control.TaskSeq and NHibernate.

PR #2534 ↗ GitHub ↗

About

Onur Gümüş

Software architect · Oslo, Norway

Software engineer with 20+ years across border infrastructure, telecom, banking and energy. I work deep in F#, C#, DDD and Akka.NET, and I’ve written a book and four video courses on .NET.

I care as much about how a design is taught as how it runs, which is why I run workshops and build in the open.

  • F#
  • C#
  • .NET
  • Akka.NET
  • CQRS
  • Event sourcing
  • DDD
  • Kubernetes
  • React
  • TypeScript
  1. 2026–
    Novian Works

    Workshops & open source, Oslo

  2. 2024–2026
    Resoptima (Halliburton)

    Senior Software Engineer, Oslo

  3. 2021–2024
    Microsoft

    Senior Software Engineer, Oslo

  4. 2017–2020
    Emaratech

    Lead Software Engineer, Dubai

  5. 2011–2017
    PI Works

    Software Architect: telecom network optimisation

  6. 2004–2011
    Banking & telecom, Istanbul

    Internet-banking security for İşbank, Şekerbank, Akbank

Books & courses

ASP.NET Core 2 Fundamentals book Learning Functional Programming with F# video course End-to-End Real-World App Development with F# video course Functional Application Designing video course 50 Things You’ve Been Doing Wrong in C# and .NET Core video course

Ask

Ask my local assistant

A small Qwen model that runs entirely in your browser. Ask it about my work, CQRS, FCQRS or the workshop.

  • The conversation never leaves your machine
  • Runs on WebGPU in a desktop browser
  • Downloads once (~1 GB), then cached

Try:

The model downloads once from a public CDN and is cached. No account, no analytics.

Contact

Get in touch.

Questions about CQRS, event sourcing, FCQRS or the workshop, or just want to compare notes? Drop me a line.

onur@novian.works
LinkedIn GitHub