Piotr Szcząchor — Fullstack .NET Developer

01 — Services

What I can do for you

/01

Web applications

Full-stack applications with .NET on the backend and React or Angular on the front — from first line to production.

/02

Systems & integrations

REST, SOAP and gRPC APIs, payments, authentication with Keycloak, AWS cloud services and integrations like Xero.

/03

Websites for small businesses

A fast, modern website that brings customers in — designed, built, deployed and maintained end to end.

02 — Skills

Tech stack

Backend

C# .NET Core & Framework SQL Entity Framework REST · SOAP gRPC Akka.NET RabbitMQ Hangfire Redis

Frontend

React Angular TypeScript JavaScript HTML & CSS TailwindCSS NgRx · Redux

Cloud & DevOps

AWS (SQS, DynamoDB) Keycloak Terraform Docker Jenkins Octopus Sentry Grafana

Tools & practices

Git Claude Code GitHub Copilot JIRA Azure DevOps BDD DDD Agile · Scrum

03 — Experience

Where I’ve worked

Developing a payment platform built on a distributed Akka.NET actor system
Designing gRPC services, including streaming endpoints for real-time communication; BDD with executable scenarios
Integrating AWS services — SQS for messaging, DynamoDB for persistence; Docker for containerisation
Maintaining a car workshop management system used across the UK: automated stock import (Hangfire, Redis) and real-time Xero accounting sync

Redesigned document parsing with asynchronous, RabbitMQ-based processing for better scalability
Implemented a Strategy-pattern parser selection mechanism handling different document types automatically
Developing new features and maintaining insurance applications

Built an insurance application used by major Polish insurers — codebase designed from scratch
Full-stack work with REST & SOAP APIs in a microservices architecture
Keycloak authentication & authorization managed with Terraform; LDAP integration for internal users
Led the migration from IdentityServer to Keycloak across legacy solutions

Developed an ERP system in .NET and Angular; designed RESTful APIs for system communication
Built a React-based webshop with a plugin system; Redux state management across React and Angular
Optimized API performance with caching, reducing response times
Collaborated in an international team of Polish, French and Swiss engineers

04 — Portfolio

Websites I’ve built for businesses

A brand website for a florist atelier — soy candles, flower boxes and floral arrangements. Elegant, fast and easy to update.

wianovaatelier.pl ↗

A website for a nail styling salon in Kraków — classic manicure, gel extensions and nail art, with online booking via Booksy. Fast, mobile-first and SEO-friendly.

ozayanails.pl ↗

05 — Projects

Personal projects

Health Harmony

Full-stack medical management application — the foundation of my engineering thesis. Appointment scheduling, doctor management and clinic administration with clean architecture and UI designed in Figma.

.NET Angular NgRx PostgreSQL JWT

github.com/PiotrSzczachor/HealthHarmony ↗

Machine Learning repository

A collection of my Jupyter notebooks covering machine learning experiments and models.

Python pandas scikit-learn TensorFlow

github.com/PiotrSzczachor/Machine-Learning ↗

06 — Education