Senior Backend Engineer & Systems Consultant

I engineer resilient backend systems, optimize high-throughput database operations, and modernize legacy codebases. Leveraging over a decade of experience, I help companies scale their Laravel/PHP applications, configure robust message queues (RabbitMQ, Redis), and ensure infrastructure reliability.

Available for select B2B engineering contracts in US & EU timezones.

Artur Marszałkowski, senior software developer who specializes in designing and building complex applications for clients across various industries

My Technical Toolbox

I design robust architectural solutions with modern PHP/Laravel, stabilize relational databases (MySQL/PostgreSQL) under heavy load, and implement fault-tolerant background processing using Redis and RabbitMQ. My background in hardware (KVM/IPAM) and containerized deployments (Docker) allows me to bridge the gap between application code and reliable infrastructure.

Let's Connect

Have a project in mind or facing a technical challenge? Reach out at artur@arturcodes.com or +48 790 340 548. Available for long-term B2B engineering contracts (20-40h/week). I specialize in stabilizing high-throughput pipelines, queue resiliency, and modernizing legacy codebases. Let's solve complex problems together.

Have a Question?

I'm always open to discussing new technologies, project challenges, or potential collaborations. Let's transform your ideas into elegant code solutions together!

WorkerTelemetry.py
component.jsx
import time
from dataclasses import dataclass

@dataclass
class QueueMetrics:
    queue_name: str
    active_consumers: int
    unacked_messages: int

    def evaluate_health(self) -> dict:
        is_healthy = self.active_consumers > 0 and self.unacked_messages < 500
        return "status": "healthy" if is_healthy else "degraded",
            "drain_rate": "optimal",
            "timestamp": int(time.time())
        

# Proactive telemetry & failure prevention
print(QueueMetrics("orders.high_priority", active_consumers=4, unacked_messages=12).evaluate_health())
                    

About Me

Senior PHP Developer with expertise in complex applications

As a dedicated Senior Software Developer, I excel in architecting and implementing sophisticated web applications tailored to address the diverse and complex requirements of clients across multiple industry sectors. Leveraging over a decade of specialized expertise in PHP, Laravel framework, and advanced database management systems, I am committed to delivering high-performance, scalable, and future-proof digital solutions that drive business growth and operational efficiency.

My development philosophy centers on creating elegant code architectures that prioritize maintainability, security, and optimal performance. By implementing industry best practices and staying at the forefront of technological advancements, I ensure that each project meets the highest standards of quality while remaining adaptable to evolving business needs. When I'm offline, you'll find me managing complex campaigns in D&D, or applying my patience for debugging to foraging for mushrooms and tending to my garden.

Professional Expertise

I offer comprehensive development services including custom enterprise application development, legacy system modernization, API integration, and database optimization. My technical approach combines robust backend systems with intuitive user interfaces to create seamless digital experiences that enhance productivity and user satisfaction.

Languages

PolishNative
EnglishC1

Education

Engineer, IT: Specialization in Mobile Applications Programming

WSG BYDGOSZCZ

January 2011 - April 2015

Technical Skills

Programming Languages & Frameworks

PHPLaravelPythonJavaScriptReact

Databases

MySQLPostgreSQLPostGISRedisMongoDBSQLite

DevOps & Infrastructure

DockerLinuxKVMWireguardCI/CD

Messaging & Queues

RabbitMQRedisReverbPusherEchoEvent-Driven Architecture

Other Technical Skills

RESTful API ArchitectureLegacy ModernizationFilamentGeospatial Data (MVT)Unit & Integration Testing

Architecture & Systems Focus

High-Throughput ProcessingQueue-Based ArchitectureDatabase OptimizationDistributed SystemsFault ToleranceTechnical Leadership

Selected Engineering Contracts & Experience

A decade of expertise in software development and technical leadership

US Enterprise PropTech (NDA)

Senior Software Engineer (Contractor)

2024 - Present
PHPLaravelRabbitMQReactLegacyPython
  • Developing innovative property management software solutions
  • Designing specialized features for residential property management platforms
  • Creating and implementing RESTful services
  • Integrating systems with third-party platforms and client IT environments

B2B Incubator Platform

Tech Lead & Architect

2023 - 2024
PHPLaravelFilamentRedisMongoDB
  • Designed and developed custom CRM solutions
  • Led accounting module development
  • Created user and access control modules
  • Developed external services communication modules
  • Maintained development servers
  • Conducted code reviews and led development team

E-commerce Printing SaaS

Senior Backend Engineer

2022 - 2023
PHPLaravelWireguardDockerjQuerySVGLegacy
  • Research and development of external services communication software
  • Led cloud migration initiatives
  • Designed and implemented stock management software
  • Optimized business processes
  • Upgraded legacy PHP software
  • Maintained systems and led development teams

UK Cloud Infrastructure Provider

Senior Infrastructure Engineer

2020 - 2022
PHPLaravelRedisLinuxIPAMKVM
  • Designed and implemented server management software
  • Created automatic bare-metal server deployment solutions
  • Developed transaction management software
  • Maintained systems
  • Led research and development initiatives

Z-MILOSCI.PL - Poland

Fullstack Programmer

2016 - 2020
PHPLaravelSVGjQuery
  • Designed and implemented printing house automation processes
  • Created customer design customization software based on SVG templates
  • Developed API communication between WordPress and main system
  • Built custom-tailored e-commerce shop and order management systems

WSG University - Poland

Academic Lecturer

2015 - Present
Smart DevicesComputer ArchitectureProgrammingEngineering
  • Teaching advanced programming concepts and practical applications
  • Developing curriculum for Smart Devices and IoT applications
  • Instructing students on computer architecture principles and design
  • Supervising student engineering projects and research initiatives
  • Bridging academic theory with industry practices through applied learning

Major Projects

Significant software solutions developed throughout my career

SEAP — Legal Discovery & Communication Auditing Pipeline

Architecture & Development (Data Engineering / LegalTech)

Data Pipeline / LegalTech
Python 3.12StreamlitTyper (CLI)DockerPyYAMLfpdf2Data Processing

An automated compliance and evidence management tool built to parse, audit, and structure multi-year communication archives into standardized legal documentation. Designed to act as an offline, containerized e-Discovery engine that evaluates textual data against behavioral rulesets (e.g., BIFF protocols) and generates verifiable private documents for legal counsel.

Key Architectural Highlights:

  • Communication & Compliance Auditing: Implemented a rule-based parsing engine to evaluate messaging transcripts against strict communication frameworks, tagging timeline events and identifying compliance anomalies.
  • Data Aggregation & Timeline Pipeline: Developed a robust CLI (Typer) and UI (Streamlit) to ingest disparate JSON/YAML data sources, calculate exact schedule discrepancies using python-dateutil, and maintain immutable logs.
  • Automated Document Generation: Engineered a reporting module utilizing fpdf2 and Markdown to dynamically generate court-ready documents (PDFs) with integrated image evidence processing (Pillow).
  • Isolated & Reproducible Environment: Fully containerized the data-processing architecture using Docker Compose, ensuring zero data leakage, strict privacy, and consistent execution.

Mushroom Map & MSI Forecast

Autonomous Geospatial Platform

Production System
LaravelPostGISPythonRedisLeaflet

A Laravel application with a mushroom map, MSI scoring in Python, and spatial data stored in PostGIS.

Key Features:

  • PHP 8.3 on Sail 8.5, Laravel 13, Blade, Breeze, Google login via Socialite, and PostGIS geometry through Laravel Magellan. Tests and tooling: PHPUnit 12, Pint, Pail, Tinker, and Sail.
  • PostgreSQL 16 with PostGIS 3.4, Redis for cache and queues, and Sail services for the app, scheduler, and queue worker. Mailpit for local mail, phpredis for the Redis client.
  • MSI calculations in Python 3.12 with NumPy and psycopg 3.
  • Vite 8, Tailwind CSS 4, Alpine.js 3, Leaflet 1.9.4 on OpenStreetMap tiles, and Bunny fonts (Instrument Sans, Figtree). The map is custom JavaScript that renders MVT tiles generated in PostGIS with ST_AsMVT.
  • Open-Meteo for weather, soil moisture, and elevation; IMGW synoptic data; forest-stand enrichment from Bank Danych o Lasach; Nominatim geocoding; Discord webhooks.

Bare-Metal Server Management

UK Cloud Infrastructure Provider

Infrastructure System
PHPLaravelMySQLRedisKVM

A comprehensive system for managing, monitoring, and provisioning bare metal servers across multiple data centers.

Key Features:

  • Automated server provisioning and configuration
  • Remote monitoring and maintenance capabilities
  • Centralized management dashboard
  • RESTful API integration and automation
  • Advanced IP address management and allocation

Printing House Automation

E-commerce Printing SaaS

B2B SaaS Engine
PHPLaravelDockerWireguardSVG

A comprehensive software solution that enhances efficiency and productivity in printing house operations.

Key Features:

  • Advanced order management and tracking
  • Inventory and material management
  • Automated print job scheduling
  • Secure customer collaboration tools
  • Legacy code modernization and containerization

Property Management Software

US Enterprise PropTech (NDA)

Enterprise Platform
PHPLaravelRabbitMQReactLegacy

Comprehensive property management software solutions enhancing operational efficiency for residential and vacation property managers.

Key Features:

  • Customizable CRM for property management
  • Integrated accounting module
  • Role-based user access control
  • Third-party service integrations

Startup CRM

B2B Incubator Platform

Internal CRM / ERP
PHPLaravelPostgresRedis

A tailored CRM solution developed to streamline customer relationship management, user administration, and financial operations.

Key Features:

  • Role-based user management system
  • Customer-centric relationship management
  • Accountant dashboard with financial tracking
  • Integrated communication tools
  • Automated workflow and task management

These projects represent a selection of my professional work. Due to confidentiality agreements, certain technical details have been generalized.