Karol Wołek

Senior .NET Developer · Manufacturo

May 2023 – present

• Develop production-floor components of a proprietary MES platform used by aerospace, space, drone and energy manufacturers, deployed for multiple customers.
• Deliver features end to end, e.g. installed-parts genealogy, analytical data collection during assembly and specialised part-installation workflows.
• Co-design a modular-monolith architecture: extracted feature modules and defined communication between them, so modules and the core application can be developed independently.
• Maintain code quality through code review, shared standards, convention tests that fail the build when rules are broken, and AI agents that enforce the standards.
• Monitor production, diagnose errors and fix them.
• Tech stack: .NET 8–10, MS SQL Server, Azure.

Senior C# Developer · Hitachi Energy (formerly Hitachi ABB)

Sep 2021 – Dec 2022

• Designed and implemented a .NET Standard 2.1 library for analysing real sensor data from power transformers (time series sampled every 0.1–5 s, from dozens of samples to millions per analysis).
• Optimised data structures and algorithms so key analyses complete in under one second.
• Verified correctness and performance on large data volumes with SpecFlow tests.

Senior .NET Developer · CyberVadis

May 2021 – Aug 2021

• Developed existing F# microservices that optimise the cybersecurity audit process.

Senior .NET Developer · BNP Paribas

Nov 2020 – Apr 2021

• Maintained and developed a banking back-office application used by branch employees to manage customer cases (.NET Framework, MS SQL Server).
• Built and extended the full Jenkins CI/CD pipeline: builds, automated tests, static code analysis, quality gates and merge checks; optimised pipeline execution time. Authored about 70% of the pipeline code.

Team Leader · Pentacomp

Aug 2018 – Oct 2020

• Led a 16-person development team on ZISAR Plus, a risk analysis and inspection management system for Polish customs and tax authorities; owned the architecture of new modules (screening engine, configuration, validation management, active case management, document management).
• Scaled the system to about 40,000 users: rebuilt SQL query generation, redesigned data-retrieval algorithms for the heaviest screens, and tuned indexes.
• Refactored the layered monolith into a modular structure.
• Earlier led a 3-developer team delivering ALK-eZapisy, an event and registration microservice for Akademia Leona Koźmińskiego, deployed to Azure.

.NET Developer · Pentacomp

Aug 2017 – Jul 2018

• Joined the ZISAR 2 project (risk analysis and inspection management for Polish customs and tax authorities) and took on increasingly larger features until promoted to team lead.
• Tech stack: .NET Framework, PostgreSQL, JavaScript, Kendo UI, jQuery.

Researcher / Software Developer · Institute of Physics, Polish Academy of Sciences

Oct 2014 – Jul 2017

• Developed molecular dynamics simulation software for large-scale protein simulations in Fortran.
• Built data analysis tools in Python.

Physics (Master) · University of Warsaw

2012 – 2014

Modified molecular dynamics software written in C++ and developed Python tools to analyse large datasets.

Microsoft Azure AI Fundamentals (AI-900)

Jul 2025

Microsoft Azure Fundamentals (AZ-900)

Apr 2023

Programming languages

C#, JavaScript, Python, Fortran, C/C++, F#

Frameworks

.NET, .NET Core, ASP.NET Core, Web API, Entity Framework, Dapper, .NET Framework, Kendo UI, React

Databases

MS SQL Server, PostgreSQL

Tools

Git, Azure, Azure DevOps, Azure Service Bus, Jenkins, Docker, SpecFlow, xUnit, NUnit

Architecture & practices

REST, DDD, CQRS, Modular Monolith, Microservices, CI/CD