09/03/2026 updated

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Senior Software Engineer - .NET, Python, Cloud & AI Solutions

St Neots, United Kingdom
Only remote
MSc in Computing (In progress)
St Neots, United Kingdom
Only remote
MSc in Computing (In progress)

Profile attachments

Sylwester_Madej_CV.docx

About me

I help companies integrate AI into their operations — RAG platforms, agentic tooling, MCP servers, and custom integrations. Also embedded development (IoT, CAN-bus). C#/.NET and Python, Azure, GDPR-compliant. 20+ years. Remote UK/EU. EN/PL

AI AgentsASP.NETApplication Programming Interfaces (APIs)C Sharp (Programming Language)Software as a ServiceCloud EngineeringDevOpsEmbedded SoftwarePython (Programming Language)TensorFlowAzure Machine LearningSystems IntegrationCloud Platform SystemPyTorchCloud TechnologiesMachine Learning OperationsCloud IntegrationWeb Api
Enterprise Software Development
Extensive experience in .NET, C#, Python development with over 20 years delivering enterprise, IoT, and AI solutions across pharma, security, and IoT industries

Cloud Integration & DevOps
Proficient in Azure and AWS cloud platforms, implementing Lambda functions, Docker containerization, CI/CD pipelines, and Service Bus architectures

AI/ML Technologies
Advanced knowledge in machine learning frameworks including TensorFlow, PyTorch, NLP, and SpaCy for building intelligent systems and data analysis solutions

Database Management
Comprehensive experience with SQL Server, Oracle, PostgreSQL, and ElasticSearch for data storage and retrieval solutions

Web Development Frameworks
Skilled in ASP.NET, MVC, Web API, WPF, Xamarin, and Microservices architecture for building scalable web applications

Agile Project Management
Certified Scrum Master with expertise in Jira, Git, Azure DevOps, and TFS for managing development teams and project delivery

Modern JavaScript Technologies
Proficient in Node.js and Angular for full-stack development and modern web application frameworks

Security Systems Development
Experience in developing SaaS software and security systems based on ONVIF standards with embedded software for Access Point devices

Experience

Professional experience10+ years
Freelancer since2023

Languages

EnglishFluentPolishNative speaker

Project history

Software Architect & AI consulting RAG-based Legal/Document Processing Platform

Madartsoft
AI-powered Clinical Trial Software
Role: AI / Full-Stack Developer Duration: [add dates] Industry: HealthTech / Clinical Research
Designed and developed an AI-powered software solution supporting clinicians in their clinical workflows. Built the backend in Python with OpenAI LLM integration to deliver intelligent assistance features for medical professionals, and implemented a modern Next.js frontend providing a responsive, clinician-friendly user interface.
Key responsibilities:
  1. Architected and implemented LLM-powered features using OpenAI APIs (prompt engineering, context handling, response validation)
  2. Developed Python backend services exposing REST APIs consumed by the Next.js frontend
  3. Built interactive UI components in Next.js / React with TypeScript
  4. Ensured the solution met healthcare data-handling expectations and integration requirements
Tech stack: Python, Next.js, React, TypeScript, OpenAI API, REST APIs

Software Architect & AI consultancy AI-powered Clinical Trial Software

Madartsoft
RAG-based Legal/Document Processing Platform
Role: Founder / Lead Architect & Developer Duration: [add dates] – ongoing Industry: Legal Tech / Enterprise AI
Designed, built and deployed LexTool — a Retrieval-Augmented Generation (RAG) document processing platform for GDPR-compliant, on-premise and cloud deployments. The system uses a hybrid architecture: a C# / .NET Web API as the main application layer and Python gRPC microservices for AI/RAG workloads.
Key responsibilities:
  1. Architected and developed C# .NET 8 Web API and Python gRPC microservices
  2. Migrated the RAG backend from a Supabase-based stack to a standalone Python microservice with Azure SQL
  3. Deployed and operated the solution on Azure Container Apps, including custom domain (app.lextool.pl), revision-based traffic splitting and a maintenance-mode mechanism via nginx
  4. Built a dedicated MCP server (LexTool.MCP) integrating Claude Code CLI with internal SQL and Container Apps tooling, plus a custom deployment skill
  5. Implemented GDPR-compliant document ingestion, embedding and retrieval pipelines
Tech stack: C#, .NET 8, ASP.NET Web API, Python, gRPC, Azure Container Apps, Azure SQL, Docker, nginx, MCP

Product Architect & Developer ongoing Industry: Industrial / Compliance / IoT

Madartsoft
Designed and developed BMS Passport, a software product targeting EU Battery Regulation (EU 2023/1542) compliance ahead of the 2027 deadline. Targeted at industrial SMEs, the solution provides a Docker-based, deployable platform for managing battery passport data and reporting.
Key responsibilities:
  1. Defined product strategy, technical architecture and go-to-market plan for the Polish industrial SME market
  2. Developed core backend services and Docker-based deployment packaging
  3. Planned integration roadmap including a Modbus-TCP connector for Victron energy systems (Phase 2)
  4. Produced sales templates, technical documentation and business plan
Tech stack: C#, .NET, Python, Docker, Modbus-TCP, REST APIs

Senior Software Engineer

Flitchtech & SwiftConnect
Developed Iridium system for Flitchtech Ltd., integrating access control systems. Built Workday-Symmetry integration using C# Web API. Maintained and delivered integration systems for Access Control and IoT solutions using C# .NET 8.0, NUnit, SQL Server, Azure Service Bus, Angular 7

Senior Software Developer

Transparity (Microsoft Partner)
Maintained and developed features in enterprise software applications using C# Web API, Xamarin, UWP, Angular. Led migration from legacy Java 6.0 to C# Web API, reducing technical debt and improving maintainability. Collaborated with architects, testers, and customers using C# .NET Core 3.1, .NET 6, SQL Server, Azure Cloud, RabbitMQ, Docker, Angular 7

Scrum Master & Device Tech Team Lead

Flowbird Group
Led two offshore development teams (7 developers, 2 QAs) and coordinated with UK-based developers. Acted as Scrum Master, managing sprints, KPIs, reporting, and stakeholder demos. Resolved blockers, coordinated CI (Jenkins), and supported development in C# and Xamarin using C#, Xamarin (embedded Android devices), Microservices, REST APIs, SQL Server, Docker

Development Engineer

Ennov Group - Contracting
Developed Document Management System and analytics software for pharmaceutical companies. Contributed to multiple projects: reporting systems, web applications, and data analysis tools using C#, MVC, Angular, Web API, Oracle DB

Senior Software Engineer

TDSi Ltd.
Design and develop the SaaS software and security systems based on ONVIF standards. Developed embedded software for Access Point devices using Node.js, C++ and C on Linux platform. Technologies: C#, MVC, Angular, Web API, SignalR, TDD, NServiceBus

Development Engineer

Assured Information Systems (Ennov Group)
Developed Document Management System and analytics software for pharmaceutical companies. Built automated text classification and NLP tools, improving customer query processing by 23%. Contributed to multiple projects: reporting systems, web applications, and data analysis tools using C#, MVC, Angular, Web API, Oracle DB, Java, Spring Boot, Crystal Reports

Portfolio

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