Open to opportunities

Radosław Szyma

@radosawszyma

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Senior .NET full‑stack developer and team leader building secure, modern microservices with Azure and React.

Poland

Message

What I'm looking for

I’m looking for a team where I can build and modernize secure .NET full-stack solutions—especially microservices with Azure/React—while taking technical and team leadership. I value cross-functional collaboration, clear planning, and production reliability.

I’m a Senior full stack .Net developer focused on delivering secure, maintainable software by translating complex medical and business requirements into practical architecture and code. I’ve led modernization efforts across backend and frontend, including migration from .NET Framework 4.64.8 to .NET 10 with upgrade planning, refactoring, and release support.

In my current role, I work with cross-functional teams and stakeholders to migrate a quality management system for hospitals in Germany and Switzerland to the newest .Net and React version. I also diagnose and resolve technical issues across backend and frontend layers to improve stability, maintainability, and delivery quality.

I designed and implemented microservices-based solutions, including service decomposition, API contracts, and inter-service communication patterns. I built production-ready components with security, observability, and operational reliability in distributed environments, and supported development execution through planning and delivery ownership.

Along the way, I’ve supported integrations with Azure AI services for audio and image recognition and integrated external AI capabilities such as speech-to-text, image analysis, and text processing into .NET systems. Previously, I delivered and evolved trading and banking platforms, implemented CI/CD processes, and refactored systems into microservices—backed by strong engineering fundamentals and continuous learning.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack .NET Developer

Current

SII Sp. z o.o.

Jan 2023 - Present (3 years 6 months)

Served as a team leader involved in the recruitment process and modernized a hospital quality management system for Germany and Switzerland. Worked on .NET/React migration, .NET Framework to .NET upgrades, microservices design, and integrations with Azure AI services and SQL Server.

.NET .NET Framework ReactJS Microservices Azure Services SQL Server Kubernetes Docker DDD Power BI Agile CI CD Refactoring

Developer

Credit Suisse

Mar 2020 - Dec 2022 (2 years 9 months)

Maintained and migrated a trading system to the latest versions, handling both core development and first-line production support. Refactored selected modules into microservices, supported integrations, and contributed to CI/CD and architectural decisions.

ASP.NET Core C JavaScript AngularJS WCF gRPC Microservices CI CD Production Support

Net Full Stack Developer

Sygnity

Apr 2019 - Mar 2020 (11 months)

Worked on a banking project for Santander, managing selected system areas and resolving production issues. Used ASP.NET MVC, WCF, and related .NET and Azure DevOps tooling to support ongoing development work.

ASP.NET MVC C WCF Azure DevOps PI SQL

Technical Leader

Pronos

Oct 2018 - Apr 2019 (6 months)

Led technical delivery as a team leader for a system monitoring revenue across stores for CCC Group. Implemented an access authorization system, generated management reports, and rewrote a legacy system using ASP.NET Core MVC with React and GraphQL.

ASP.NET Core React JavaScript GraphQL Entity Framework Domain Driven Design Elasticsearch Docker Microservices gRPC CI CD HTML Ecommerce Authorization

Own Business .NET Developer

RDK

Aug 2017 - Oct 2018 (1 year 2 months)

Designed a GDPR audit system for a law firm with a personalized, reconfigurable survey workflow. Developed the solution using ASP.NET MVC and SQL Server, including integration of survey-driven document preparation.

ASP.NET MVC EF6 Kendo Microsoft SQL Server T SQL JavaScript HTML5 Survey Driven UI

Junior .NET Developer

Domodi

Oct 2016 - Jul 2017 (9 months)

Designed and maintained parts of an educational system responsible for managing educational materials, including video files and text documents. Developed UI and business logic using ASP.NET MVC 6 and C#, and worked with database procedures and legacy marketing tool refactoring.

ASP.NET MVC C EF6 T SQL Solr Dapper Kendo Webpack IIS SQL CI CD Scrum Multithreading Asynchronous

Junior .NET Developer

Cube ITG

Aug 2015 - Mar 2016 (7 months)

Developed and maintained backend and frontend components for a Santander banking project targeting the German market. Took ownership of end-to-end testing, performed root-cause analysis for defects, and implemented integrations with Oracle Database using C# and WCF.

C JavaScript jQuery Oracle Database WCF End To End Testing Root Cause Analysis

Junior Software Developer

Factory Code S.C

Apr 2014 - May 2014 (1 month)

Supported the development of a large-scale e-commerce platform, implementing backend services and frontend features. Built shopping functionality (catalog, search/filter, cart, checkout), created reusable Razor UI components, integrated frontend with backend APIs/controllers, and resolved full-stack production issues.

C JavaScript jQuery MS SQL Server Stored Procedures API Integration Filtering Secure Coding

Computer Specialist

Wielton S.A

Feb 2010 - Mar 2010 (1 month)

Supported LAN environment administration for Windows XP workstations, including routine checks, preventive maintenance, and troubleshooting. Assisted with user account management, shared resource configuration, endpoint protection (antivirus and scans), and first-line technical support.

LAN Support Troubleshooting User Account Management Access Rights Configuration Network Monitoring Technical Documentation