Łukasz Sobierajski
From: Poland
Location: Warszawa
On Useme since 28 July 2026
About me
.NET software engineer with 14 years of experience, the last 8+ in Nordic banking (Netcompany Banking Services, Nordea). I build backends, integrations and automation that keep running for years — not just demos.
What I do: • C#/.NET applications and services — REST APIs, WCF, WPF, SQL Server • System integration: SOAP/XSD, MQ/MSMQ messaging, ESB, workflow engines (Windows Workflow Foundation) • Process and reporting automation: PowerShell, Azure DevOps API, e-invoicing (KSeF), data acquisition from external systems • AI solutions: LLM agents and my own multi-agent orchestration platform (126k lines of C#, in daily production use)
How I work: analysis and a fixed quote up front, regular updates while the work is running, a working product with documentation and tests at the end. I meet deadlines and write code your team can maintain.
English C1 — daily working language with teams in Denmark, Norway and Sweden. Running my own business since 2017, VAT invoices.
CV / Résumé
Mar 2026 - Now
Architect and developer
Lucy — autorska platforma AI (projekt R&D)
Agentic AI platform: orchestration of up to 6 concurrent LLM sessions, budget and rate-limit control, failure detection, human-in-the-loop approval. ~126k lines of C#, WPF (.NET 10) and Android clients, in daily production use.
Nov 2018 - Now
Senior .NET Developer / Consultant
Netcompany Banking Services (dawniej SDC)
Development and maintenance of core-banking systems in a service-oriented (ESB) architecture for Nordic markets. Single-handedly delivered a WF3→WF4 workflow-engine upgrade with a Visual Studio extension after an external vendor had failed.
Feb 2018 - Oct 2018
.NET Developer
Nordea
Modernization of the mortgage collateral system (213 → Collate) in the credit-risk area. Business logic in C#, WCF-based service communication, work aligned with ITIL and SAFe.
Mar 2017 - Jan 2018
.NET Developer
ITIS
Insurance portals for the VIG group (InterRisk, Compensa) on the Baltic markets: WebForms, T-SQL stored procedures, consuming WCF services.
Apr 2012 - Feb 2017
.NET Developer
EBR IT
AgentDashboard for 2,300 call-center agents (Mediacom, USA) — WPF, MVVM, WebServices, NHibernate. Outage Management System (200 users) on MSMQ. External-data integration and CI/CD automation with Jenkins.
Portfolio
Upgrade silnika procesów WF3 → WF4 (bankowość)
Migration of a core-banking workflow engine from Windows Workflow Foundation 3 to WF4, plus a Visual Studio extension. Working PoC and about half of the migration in under 500 hours — a task an external vendor had called infeasible.
AgentDashboard — call center na 2300 stanowisk
Application for call-center agents of a US telecom operator (Mediacom): WPF/MVVM, web services, NHibernate, Spring.NET. Plus an outage management system for 200 users built on MSMQ queues.
Boty i wskaźniki tradingowe (cTrader / cAlgo)
Algorithmic trading bots and indicators for the cTrader platform in C#: candle data collection and analysis (hundreds of MB of history), backtesting, risk control and market event handling.
Lucy — platforma agentowa AI (C#, .NET 10)
My own platform orchestrating LLM agent sessions: account and model routing policy, rate-limit and budget control, stall and failure detection, an append-only event ledger, human-in-the-loop approval. WPF desktop client and an Android app with push.
Automatyzacja rozliczeń: KSeF, JPK, Azure DevOps
Back-office automation for a one-person company: e-invoicing via the Polish KSeF system, JPK_V7M tax-file generation and submission, deadline and payment tracking, Azure DevOps REST API integration. C# and PowerShell, government API integrations.