mc.MARCIN
CZERNECKI

SOFTWARE ENGINEER & ENGINEERING MANAGER

Marcin
Czernecki.

Complex problems.
Thoughtful systems.

I turn business challenges into dependable software.
From the first line of C# to the cloud.

Explore my work GitHub
KATOWICE, POLAND INDEPENDENT MIND. COLLABORATIVE SPIRIT. SCROLL TO EXPLORE

COMPANIES I’VE
WORKED FOR

01 / THE PERSON BEHIND THE CODE

Marcin CzerneckiMARCIN CZERNECKI / KATOWICE, PL

Hands-on engineering.
Technical leadership.

I build distributed systems and help teams deliver them. For me, technical leadership means staying close to the code, the architecture, and the people doing the work.

I’m Marcin, based in Katowice, Poland, and currently an Associate Engineering Manager at Altium. Since 2012, I’ve built scalable software with .NET, AWS, and Azure across retail, finance, insurance, and HR tech, serving global markets and handling high-scale workloads.

My work combines architectural decisions with ownership of delivery: setting technical direction, improving reliability and performance, and getting high-quality systems into production. I mentor engineers and improve development standards, balancing technical quality with real business impact.

I also design and implement LLM-based workflows, AI agents, and automation with Semantic Kernel, LangChain, and cloud AI platforms. It’s another part of the same engineering challenge: turning complex requirements into systems that work reliably.

Ask for my CV
14+YEARS BUILDING SOFTWARE
30+COMMERCIAL PROJECTS
01ENDURING CURIOSITY

My working toolkit

01

Backend & architecture

C# · .NET · ASP.NET · REST APIs · Microservices

02

Cloud & delivery

Azure · AWS · Docker · CI/CD · Jenkins

03

Data & reliability

SQL Server · MySQL · Redis · BDD · Load testing

04

People & interfaces

Team leadership · Coaching · TypeScript · Angular

05

AI & automation

Semantic Kernel · LangChain · LLM workflows · AI agents

02 / THE JOURNEY

Always building.
Always learning.

Full story on LinkedIn
2026 — PRESENTAltium Associate Engineering ManagerENGINEERING MANAGEMENT

Associate Engineering Manager at Altium since July 2026.

2021 — 2026Sage Senior Software EngineerCLOUD & BACKEND

Built reliable web services on AWS with .NET, and developed load and stress testing frameworks. Worked with behavior-driven development, distributed services, and maintainable architecture.

Software Engineer, 2021–2022 · Senior Software Engineer, 2022–2026

AWS.NETMySQLRedisBDD
2020 — 2021EPAM Systems Senior Software EngineerCLOUD MODERNIZATION

Modernizing a global insurer’s legacy application suite into a SaaS solution on Azure. Backend development, Angular interfaces, and comprehensive testing with Moq, NUnit, and FluentAssertions.

Azure.NET CoreAngularAzure DevOps
2015 — 2020Diebold Nixdorf Senior Software Engineer & Team LeadRETAIL & LEADERSHIP

Delivering retail software for international markets, implementing fiscal requirements and customer-specific integrations. Leading a development team, coordinating automated testing, and training colleagues across countries.

Software Engineer, 2015–2017 · Senior Software Engineer / Team Lead, 2017–2020

C#SQL ServerJenkinsTeam leadership
2012 — 2015Serious Impact Full Stack DeveloperWEB & APPLICATIONS

Building web applications and APIs in .NET and PHP, designing databases, and developing frontends with JavaScript, HTML, and CSS. Turning business needs into working products.

ASP.NET MVCPHPJavaScriptPostgreSQL
THE FOUNDATION

MSc, Computer ScienceUniversity of Silesia · 2014–2015 · Software Engineering

BEng, Computer ScienceUniversity of Silesia · 2010–2014 · Computer Games Development

03 / SELECTED WORK

Built for the real world.

A few problems I’ve helped solve.
Different industries. The same care.

IKEA store exterior01 / RETAIL SYSTEMS

A smoother checkout.

IKEA

Client project · Delivered as part of the Diebold Nixdorf team

Self-checkout improvements and intelligent tray recognition for a global retailer.

C# / .NETComputer vision integrationRetail
More from the archive 08 PROJECTS
Country Packages Product development at Diebold Nixdorf Sephora Client project via Diebold Nixdorf PlaceKnow Client project via Serious Impact Piotr i Paweł Client project via Serious Impact Employee Management System Developed at Serious Impact PassStorage 2 Independent project · WPF / Cryptography Learn and Play with Kinect Independent university project Benetton Client project via Diebold Nixdorf

04 / WHAT’S NEXT?

Good things start
with a conversation.

A project, a challenge, or just a hello.

LinkedIn GitHub
PROJECT NOTES

DIEBOLD NIXDORF / 2015–2017

Country Packages

Retail, localized.

I extended Diebold Nixdorf’s TP.NET retail platform to meet country-specific legal requirements and reduce development time on customer projects.

As a developer and team leader, I worked on support for payment terminals, fiscal and thermal printers, cheque scanners, and cash drawers.

C# / .NETAngularServiceStackT-SQLNUnitJenkins

SEPHORA APAC / DIEBOLD NIXDORF / 2019

Sephora

A new market. A distributed team.

I led the team customizing Diebold Nixdorf’s TP.NET solution for Sephora’s first store in Seoul, South Korea.

The development team was based in Mumbai and included colleagues I had previously trained on site. My role brought together team leadership, knowledge sharing, and customer-specific software delivery.

C#AngularSQL ServerServiceStackTeam leadership

PLACEKNOW / SERIOUS IMPACT / 2013

PlaceKnow

Connecting people and places.

A tourism social application for finding hotels, restaurants, and attractions, buying trips, sharing photographs, and messaging other travelers.

I was responsible for backend development: creating the web service and synchronizing data with the existing social networking website.

PHPZend Framework 2Doctrine ORMWeb API

PIOTR I PAWEŁ / SERIOUS IMPACT / 2012–2013

Piotr i Paweł

The grocery store, on mobile.

A mobile application for the Polish supermarket chain, with a loyalty card, promotions, product lists, barcode scanning, favorites, and sharing.

I developed the web services powering the mobile applications and the CMS used to manage their content.

PHPZend Framework 2Doctrine ORMJavaScriptBootstrap

SERIOUS IMPACT / 2014–2015

Employee Management System

A clearer picture of working time.

An Azure-hosted human resources application for managing employees and reporting on their working time.

As lead application developer, I built a system with two connected parts: a web service for an Android application, and the main CMS application in ASP.NET MVC with Entity Framework.

C#ASP.NET MVCEntity FrameworkAzureJavaScript

PERSONAL PROJECT / STARTED 2017

PassStorage 2

An offline password manager.

A Windows desktop application built in C# and WPF, exploring local password storage, encryption, and a Material Design interface.

The application stores its data locally and uses a master password to decrypt the file content. This is an archived personal project, not a recommendation for production password management.

C# / .NET FrameworkWPFSQLiteCryptography
Explore the source

UNIVERSITY PROJECT / 2012–2014

Learn and Play with Kinect

Learning through movement.

Built for my engineering thesis, this project explored educational games for children using Microsoft Kinect’s touch-free motion sensors.

The goal was a multimedia learning experience available on Windows, using body movement as an interface instead of a conventional controller.

C#XNAKinect SDKWindows
Explore the source

BENETTON ITALIA / DIEBOLD NIXDORF / 2019

Benetton

Connecting retail software and hardware.

I was responsible for integrating the RCH RT-One fiscal printer into the retail solution.

The implementation followed a gap-analysis meeting with the customer in Treviso, Italy, connecting customer requirements with the technical integration.

C# / .NETJavaPOSPOS for .NETServiceStackSQL Server

CLIENT: IKEA / EMPLOYER: DIEBOLD NIXDORF / 2019

A smoother checkout.

IKEA retail environment

The work

As part of the Diebold Nixdorf team working for its client IKEA, I improved self-checkouts, integrated Trayzi’s video-based tray-content recognition for IKEA Bistro, and resolved issues across multiple countries.

My contribution

Software development and integration, working within an international retail environment.

C#.NET FrameworkWindows FormsSQL ServerJenkins

Project photography: IKEA newsroom / Design Middle East.

GLOBAL INSURANCE COMPANY / EPAM / 2020–2021

From legacy to possibility.

Insurance project supporting image

The work

Developing a new SaaS application suite and modernizing legacy software for a global insurance company, deployed on Microsoft Azure.

My contribution

Backend and cloud development using Azure Functions, Service Bus, and Key Vault, alongside ASP.NET, Angular, and automated testing.

.NET CoreAzureSQL ServerNUnitAzure DevOps

DECATHLON / DIEBOLD NIXDORF / 2018

One platform. Many markets.

Decathlon retail environment

The work

Customizing Diebold Nixdorf’s TP.Net solution for customer needs and local legal requirements. Preparing software for new markets in Canada and Israel, and extending existing solutions in France, Sweden, Colombia, and Chile.

My contribution

Software development, retail customization, and country-specific integrations.

C#VB.NETSQL ServerWinFormsJenkins

Project photography: Bankier / PR Newswire.

SPAMPROTECTOR / PERSONAL PROJECT

A little less inbox chaos.

SpamProtector system architecture

The problem

One of my mailboxes received over a thousand spam emails a day. When my hosting provider removed filtering, I built a solution of my own.

The system

A suite of services scans mail against configurable subject, domain, and sender rules. Separate services catalog suspected spam and remove it after a retention period, helping keep control over potentially important mail.

.NETEntity Framework CoreRabbitMQWorker Services
Explore the source