Maciej Izak

About Me

Passionate about building high-performance systems and developer tools

I'm a Senior Backend Developer with over 15 years of experience building high-performance, scalable systems. My expertise spans from low-level memory optimization to full-stack development, with a particular passion for .NET ecosystem, compiler design, and functional programming.

Currently, I'm working on VibOps — a visual infrastructure designer built with F# and the SAFE Stack. I believe in writing code that's not just functional, but elegant and maintainable.

When I'm not coding, you'll find me playing with my kids, creating non-existent dinosaurs with AI 🦕, or making music.

⚡

                            Performance Optimization
                            Memory management, low-latency systems, multithreading
                        

🔧

                            Compiler Design
                            Built compilers that compile other compilers
                        

🌐

                            Open Source
                            Contributing to FreePascal RTL and more
                        

λ

                            Functional Programming
                            F#, Computation Expressions, SAFE Stack
                        

Work Experience

A journey through high-performance systems and innovative solutions

Elastic Email

Backend Developer

Nov 2019 - Oct 2024 · 5 years

Optimized email processing achieving 99.97% performance increase, saving 17+ hours of thread work per 30-minute interval
Implemented stack-based caching mechanism in C#, eliminating heap allocations
Increased free disk space by 200% across multiple servers
Migrated large system from .NET 4.8 to .NET 8
Integrated ML.NET for analytics and automation
Enhanced CI/CD with MSBuild, Source Generators, and database integration

.NET Core C# Memory Management Microservices ML.NET

LiveMon

Senior Software Engineer

Feb 2018 - Nov 2019 · 2 years

Developed high-performance server applications for Linux and Windows
Managed large datasets with SQLite3, ORM, and DDD principles
Built REST servers and CRUD applications within SaaS model
Optimized URL monitoring using libcurl library

C FreePascal REST SQLite3 DDD

Adith Tec

Android Developer + DB Backend

Jun 2015 - Jul 2018 · 3 years

Designed multi-tier database applications with REST, ORM, SQLite3, PostgreSQL
Developed native GUI applications for Windows and Android using JNI/NDK
Built interactive kiosks with Vue.js integrated with legacy systems
Created advertising system with PHP/JavaScript and native client

Android Vue.js PostgreSQL JNI/NDK

DaThoX

Owner / Founder

Nov 2009 - Oct 2014 · 5 years

Created custom IDE for native GUI applications (features integrated into Lazarus IDE)
Built generic collections library for Pascal (now part of official FreePascal RTL)
Developed .NET compiler capable of compiling another compiler
Contributed to open-source projects including FreePascal

Compiler Design IDE Development Open Source FreePascal

Embarcadero / Borland

R&D Developer (Delphi)

Jan 2011 - Jan 2012 · 1 year

Created 3D demo applications and technical documentation
Developed components for Windows and macOS native applications

Delphi 3D Graphics Shaders R&D

Open Source Projects

Building tools and contributing to the developer community

🔧

Featured

FunPascal - .NET Compiler

A dream project — a working compiler for .NET written in F# that can compile another compiler. Deep dive into functional programming with heavy use of Computation Expressions for compiler intrinsics.

F# Compiler .NET Computation Expressions

GitHub

🛠️

Open Source

NewPascal / FreeSparta

Custom IDE with WYSIWYG tools integrated into Lazarus IDE. Implemented smart pointers for FreePascal and new syntax elements (management operators).

GitHub Demo

📦

Official RTL

Generics.Collections

Generic collections library for Pascal inspired by C# collections with proven algorithms from Java. Now part of the official FreePascal RTL.

GitHub

🎨

Current

VibOps

Visual infrastructure designer — stop writing YAML, start designing your infrastructure. Built with F#, SAFE Stack, and modern DevOps practices.

GitHub

Technical Skills

Technologies and tools I work with

⚙️ Backend

.NET Core / C#Expert

F#Advanced

ASP.NET CoreExpert

Entity FrameworkAdvanced

🗄️ Databases

SQL Server / T-SQLExpert

PostgreSQLAdvanced

MongoDBIntermediate

MySQLAdvanced

🎨 Frontend

Vue.jsAdvanced

React (Feliz/Elmish)Intermediate

JavaScriptAdvanced

HTML5 / CSS3Advanced

🚀 Specialties

Memory ManagementExpert

MultithreadingExpert

Compiler DesignAdvanced

CI/CD & DevOpsAdvanced

💻 Languages

C# / F#Expert

Delphi / Object PascalExpert

JavaIntermediate

CIntermediate

🛠️ Tools & DevOps

GitExpert

MSBuild / Source GenExpert

DockerIntermediate

dotTrace / dotMemoryAdvanced

About Me

Work Experience

Open Source Projects

FunPascal - .NET Compiler

NewPascal / FreeSparta

Generics.Collections

VibOps

Technical Skills

⚙️ Backend

🗄️ Databases

🎨 Frontend

🚀 Specialties

💻 Languages

🛠️ Tools & DevOps

Education

West Pomeranian University of Technology

West Pomeranian University of Technology

Let's Build Something Amazing