Hi, I’m Daniel Olczyk
I design and build .NET APIs and distributed services. I also tune SQL queries and write Rust tools.
Backend engineering
.NET APIs & integrations
Distributed systems
Messaging & reliability
Community
Talks, workshops & mentoring
Open source
.NET contributions & Rust projects
Backend work with .NET, from business automation to service integrations.
Full history on LinkedInGodel Technologies
Vanto IT Solutions
Syneriz
Let's Automate
Personal projects and work with Rust Lab PJATK.
A GraphQL API for a movie database
I built the API in .NET with HotChocolate and Azure Cosmos DB. Aspire runs the local infrastructure, including the Cosmos DB emulator.
Details19+ integration tests cover GraphQL workflows, authentication and authorisation, CRUD operations, and database integration.
Access Xiaomi scale readings from an AI assistant
I designed and built the server myself as a multi-crate Rust workspace. It uses Streamable HTTP, bearer-token authentication and the system credential store, and handles encrypted payloads.
DetailsTests cover authentication, encryption and cache persistence. The SurrealDB cache has expiry policies and falls back to memory.
A board for notes, images and a personal knowledge base
I built the board interactions and note components, along with import and export for the desktop and web versions.
DetailsBuilt during the 100 commitów challenge. It runs on Windows, macOS and Linux, and in a browser.
A CHIP-8 interpreter written in Rust
I coordinated development at Rust Lab PJATK and worked on the virtual machine, audio subsystem and Notan/egui interface.
DetailsSupports all 35 original CHIP-8 opcodes, ROM loading and runtime debugging, with graphics and audio.
I share what I learn through workshops, open-source contributions and community projects.
President & lecturer
I lead the Rust Lab PJATK community. I mentor contributors through code reviews and technical consultations, and help with their project work.
I organise talks and workshops and teach sessions on async Rust, Docker optimisation and post-quantum cryptography. I also coordinate speakers and prepare workshop materials.
I coordinate projects such as Hachi and work with companies, academic institutions and other developer communities.
Member, then Secretary (2025 to 2026). President since March 2026.
Explore Rust LabI added a file-scoped namespace snippet and made C# type snippets use the filename as their default name.
I improved keyboard focus outlines on NuGet.org, including Firefox support and clearer focus states on package tabs.
I contributed homework and student-remark features in C# with Xamarin.Forms and ReactiveUI, working on API integration, local data storage, view models and UI.
I contributed Android features in Kotlin, including lucky-number history, message drafts, and final-grade average calculations with unit tests.
How multi-stage builds and caching speed up local builds and tests, using a hackathon project as an example.
How quantum computing threatens current encryption, and which algorithms are being adopted in response.
An introduction to Future, concurrency and I/O in Rust, with exercises and common mistakes to work through.
3rd place · Blockchain Hack Warsaw 2026
Our six-person team built a Solana trading agent in 24 hours. It turns natural-language strategies into automated market monitoring and trades.
Working MVP in 24 hours · HackYeah 2025
We built and deployed a journey-planning MVP for the hackathon demo. It used a .NET backend, GTFS transport data and user-report classification.
Articles about Rust and the projects I work on.
Understanding reflection in Rust
11 min read
Notes from two days of Rust talks, workshops and our club’s participation as an event partner.
Rust platform support, libraries and the choice between std and no_std, with Arduino examples and lessons from embedded projects.
6 min read
How we used transport data and backend integrations to build an MVP, with lessons on teamwork, delivery and infrastructure problems under a deadline.
8 min read
My main focus is backend development. I also work with frontend tools and AI coding assistants.
Computer Science
Polish-Japanese Academy of Information Technology
to · In progress
Anthropic
Issued · Expires
Verify credentialMicrosoft
Issued
Verify credentialIf you'd like to work together or talk about software, send me an email.
contact@dolczyk.rocks