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Achievement: Pull Sharkx2Achievement: Arctic Code Vault Contributor

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Achievement: Pull Sharkx2Achievement: Arctic Code Vault Contributor

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@problem4j @malczuuu

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damianmalczewski/README.md

👋 Hi, I'm Damian

Java Spring Spring Boot PostgreSQL MongoDB Kafka Docker Kubernetes IntelliJ IDEA Python Kotlin Go GitHub Actions GitLab CI Linux

I'm a backend engineer focused on building reliable, maintainable systems. Most of my work revolves around Java, Spring Boot, and designing APIs that are easy to use and hard to break.

I enjoy making things run smoothly - from automating CI/CD pipelines to tuning services and cleaning up codebases. Day to day, you’ll usually find me in IntelliJ, a terminal, or inside a Docker container.

🛠️ Core technologies

  • Java, Spring Boot
  • MongoDB, PostgreSQL
  • Docker
  • Occasionally: Go, Python, Kotlin

💡 Featured Projects

Problem4J

A Java library for standardized HTTP API error responses based on RFC 7807 – Problem Details for HTTP APIs, featuring Spring Boot integrations and custom abstractions for exception-to-response mapping. It extends Spring's built-in ErrorResponse and ProblemDetail support with a more flexible and expressive programming model.

Visit project's website for more info.

iEmu

A simple browser-based emulator for LwM2M IoT devices with support for the LwM2M Light Control object (/3311).

Visit project's repository for more info.

Expand for more...

PyTemple

A tiny Python library for lightweight formatted text template generation, useful for tests, mocks, and randomized messaging.

Visit project's repository for more info.

TestClock

A mutable & playable java.time.Clock for unit tests with support for manual rewinding, forwarding, and automatic time progression.

Visit project's repository for more info.

🤝 Let's get in touch

https://www.linkedin.com/in/damian-malczewski

Pinned Loading

  1. problem4j/problem4j-spring problem4j/problem4j-spring Public

    Spring integration for library implementing RFC7807 (and RFC9457)

    Java 9

  2. iemu iemu Public

    Emulator application for an IoT device working with LwM2M

    Kotlin 3 1

  3. malczuuu/testclock malczuuu/testclock Public

    A mutable & playable java.time.Clock for unit tests

    Java

  4. composes composes Public

    Various docker-compose.yaml drafts used for local development

  5. failbook failbook Public

    A simple HTTP API error documentation hub

    Go