bash — krystian@portfolio

Available for hire

Hi, I'm Krystian Potaczek

Python /
Fullstack Developer

I build web applications around real business problems.

Backend-focused - Full-stack aware - AI-assisted workflow

PythonDjangoREST APIPostgreSQLDockerNext.js / React

View projects Download CV

GitHub·LinkedIn·Email

2 projects with live demos - Computer Science student - 2 years of IT experience - English B1/B2

🚀2 projects with live demos

⚙️Django / DRF / PostgreSQL

🧠600h+ Python + Django + AI

🤖AI-assisted workflow

💼2 years of IT experience

🚀2 projects with live demos

⚙️Django / DRF / PostgreSQL

🧠600h+ Python + Django + AI

🤖AI-assisted workflow

💼2 years of IT experience

ABOUT ME

From passion to applications that solve real problems

Krystian Potaczek

Python / Fullstack Developer

Backend-focused • Full-stack aware

Programming was not a random choice for me. I have been interested in computers, technology and software development for years - starting with hardware, networking and IT fundamentals, and gradually moving deeper into code, web applications and backend development.

Today I am growing as a Python / Fullstack Developer. I focus on building web applications, REST APIs, databases and business logic. Backend is the area I enjoy the most, but I also understand frontend and the full process of turning an idea into a working demo.

For 2 years at PRO-KOM, I built and deployed web applications, Python automations and solutions for business clients - from needs analysis through implementation to maintenance. That experience strongly shaped how I approach software: I look not only at the code, but also at the user, the process and the real problem the system is meant to solve.

advanced projects with live demos

12+

technologies used in projects

600h+

learning Python, Django and AI

2 years

of experience in an IT environment

Developer mindset

I do not start with a framework or a technology. First, I try to understand the problem, the user and the business process. Only then do I choose the right tools, design the architecture and implement a solution that is not only technically correct, but genuinely useful.

AI-assisted workflow

I use Claude, ChatGPT, Codex and GitHub Copilot consciously - as support for research, code analysis, debugging, documentation and refactoring. I treat AI as a productivity tool, but technical decisions, architecture and responsibility for the final code always stay on my side.

I am looking for a place where I can grow as a Python / Django Developer and learn from more experienced engineers.

PROJECTS

Real applications. Working demos.

Not just technical exercises - systems built to solve real problems.

🚀 Flagship Project

StayMap Polska

A full-stack accommodation booking platform in Poland with a map-first approach.

Polish AI search, dynamic pricing engine, real-time chat via WebSocket, full host panel and content moderation. Built with Django 5 + DRF, PostGIS for geospatial search and Celery for asynchronous tasks.

12 modules44 views25 tests9 travel modes

Django 5DRFPostGISRedisCeleryChannelsNext.js 14WebSocketOpenAI

🚀 Live Demo 📂 GitHub 📋 Case Study →

StayMap Polska - accommodation booking platform in Poland

💥 Business Solution

PRO-KOM Serwis System

A repair management system for small and medium electronics service businesses.

End-to-end automation of the repair workflow - from device intake to customer pickup. Three panels: customer, staff Kanban board and admin dashboard. Celery for async tasks, real-time status tracking, audit log and RBAC.

3 panelsRBACAudit logSSL/TLS

Django 5.1DRFPostgreSQLCeleryRedisNext.js 14DockerNginx

🚀 Live Demo 📂 GitHub 📋 Case Study →

⚡ This Website

Portfolio Website

This website - a premium personal brand portfolio built with Next.js 15, TypeScript and Tailwind CSS v4.

Next.js 15TypeScriptTailwind v4Framer MotionVercel

📂 Source code

PROOF OF WORK

Not just icons. Concrete proof.

Every technology below is connected to a real project where I actually used it.

Django + DRF

REST API for StayMap - bookings, authentication, host panel, moderation and AI search. 47 endpoints with Swagger/OpenAPI documentation.

PostgreSQL + PostGIS + GeoDjango

Geospatial accommodation search in StayMap. PostgreSQL with PostGIS, spatial queries, location-based filtering and ranking offers by distance.

Celery + Redis

Redis used as cache, Celery broker and Channels layer. Asynchronous tasks in StayMap: cleanup, automatic booking cancellation and reminders.

WebSocket + Channels

Real-time chat in StayMap built with Django Channels and Daphne ASGI. Events: message.new, typing and read status.

JWT + Google OAuth

Authentication with token rotation and HTTP-only cookies in StayMap. RBAC and access control in PRO-KOM System.

Docker + Compose

Development and production environments for both main projects. Docker Compose, Nginx reverse proxy and Certbot SSL in PRO-KOM System.

Next.js App Router

BFF proxy pattern, SSR/CSR and 44 views in StayMap. This portfolio is built with Next.js 15.

pytest + Playwright

25 backend test files in StayMap: pytest-django, Faker and application logic tests. End-to-end frontend tests with Playwright.

OpenAI API + LangChain

Polish AI search in StayMap - natural language interpretation and mapping user intent to filters. LangChain chatbots with conversation history.

Swagger / OpenAPI

Automatic API documentation generated with drf-spectacular in StayMap. REST contract available through Swagger/OpenAPI.

PRACTICAL PATH

Python + Django + AI in practice

During the intensive LearnIT program, I worked through a full backend development path: from Python fundamentals, OOP and SQL, through Flask, Django, DRF and FastAPI, to Docker, testing, CI/CD, AWS basics and technical interview preparation.

In total, it was over 600 hours of learning, practical exercises and project work. The biggest value for me was moving from theory to practical applications built step by step.

View full learning path

34+

lessons

600h+

learning, exercises and projects

Backend

REST API · DevOps · AI

Python

Django · DRF · FastAPI

TECH STACK

Technologies I use

Not a random list of tools - only technologies I use in real projects.

Backend

Python 3.12Django 5DRFREST APIFastAPIFlaskCeleryGeoDjangoSQLAlchemyAlembic

Databases

PostgreSQLPostGISRedisSQLiteSQL

Frontend

Next.js 15ReactTypeScriptTailwind CSSFramer MotionZustandReact QueryRadix UI

DevOps & Infra

DockerDocker ComposeNginxGitHub ActionsVercelRenderCertbot SSL

Auth & Quality

JWTGoogle OAuthSimpleJWTpytestpytest-djangoPlaywrightCoverageFaker

AI & Tools

OpenAI APILangChainClaudeChatGPTGitHub CopilotCursorCodexGitPostmanSwagger

EXPERIENCE & EDUCATION

My path to Python

Programming is not a random career choice for me - it is a direction I have been developing for years, from an interest in computers and technology, through studies, courses and work in an IT environment, to my own Django applications with working live demos.

PROJECT2025 - 2026

StayMap Polska + PRO-KOM System

Two advanced projects with live demos. Django, DRF, PostgreSQL/PostGIS, Celery, Redis, WebSocket, Next.js and Docker. These projects show how I approach business applications: from process analysis, through backend and API, to a working user interface.

COURSENov 2025 - May 2026

Python + Django + AI - LearnIT

Intensive practical course covering Python, OOP, SQL, Flask, Django, DRF, FastAPI, Docker, AWS basics, CI/CD, testing and technical interview preparation. Completed with a project and certificate.

COURSEOct 2025 - Dec 2025

Ready4AI

Practical course on using AI in software development: LLMs, chatbots, AI agents, prompt engineering, Claude, Cursor, AI-assisted code review, technical documentation and deploying a web application from idea to cloud.

STUDIESSep 2024 - present

Computer Science - Business Application Developer

Studies focused on designing and building business applications, object-oriented programming, databases, information systems, web applications, UI/UX and software engineering fundamentals.

WORKJul 2024 - Jun 2026

Python / Fullstack Developer (Django, Next.js) - PRO-KOM

I built and deployed web applications and internal tools for the company and its business clients: Python and Django/DRF backends, React/Next.js frontends and Python automations. I owned the end-to-end process - from client needs analysis, through implementation, to production deployment and maintenance. Working close to real business processes taught me to view technology through the lens of the user and the problem, not just the code.

GROWTHfor years

Programming as a passion

My interest in IT started with computers, hardware, networks and my first attempts at programming. Since then, I have been growing through projects, courses, technical books, podcasts and hands-on application building.

LIBRARY

Books that shaped my approach to programming

I do not read technical books just to add them to a CV. I read them because I genuinely want to understand code, quality and responsibility in software development.

Clean Code

Robert C. Martin

Code is written for people, not only for machines. Readability, naming and simplicity are part of professionalism.

The Pragmatic Programmer

Andrew Hunt, David Thomas

Take responsibility, automate, look for better solutions and keep improving your craft.

Software Craftsman

Sandro Mancuso

Programming is a craft - quality, responsibility and long-term value matter.

The Clean Coder

Robert C. Martin

Professionalism is not only about code. It is also about communication, responsibility and an honest approach to work.

Test-Driven Development: By Example

Kent Beck

Tests help clarify requirements and design system behavior before implementation.

Grokking Algorithms

Aditya Bhargava

Algorithms teach problem solving - how to choose an approach that is simpler, faster and more scalable.

C++ Opus Magnum

Jerzy Grębosz

C++ fundamentals help me better understand memory, program structure and what happens under the hood.

AI WORKFLOW

AI as a tool, not an oracle

I use AI consciously - I verify results, understand the code and take responsibility for technical decisions.

Claude, ChatGPT, GitHub Copilot, Codex and Cursor are part of my daily workflow - just like the terminal, documentation and code editor. They help me analyze problems faster, explore solutions, write better documentation, debug and learn new technologies.

I do not treat AI as a shortcut or a replacement for thinking. I want to understand and justify every technical decision myself. For me, this is the line between a responsible workflow and blindly generated code.

"I verify every result, understand the code and take full responsibility for what I deliver."

ClaudeChatGPTCodexGitHub CopilotCursor

Code Review before commit

I analyze changes, architecture, edge cases and potential problems before pushing code.

Technical documentation

AI helps me prepare BRD, PRD, SDD and TSD faster - I verify the structure, meaning and every key assumption.

Technical decision analysis

I compare approaches, trade-offs and consequences - for example, when to use PostGIS and when a simpler data model is enough.

Refactoring and optimization

AI helps identify possible improvements, but I make the final decision after checking the impact on readability, architecture and application behavior.

Learning new technologies

I use AI as a mentor: asking for explanations, examples, practice questions and comparisons with technologies I already know.

CERTIFICATES

Verified competencies

Documents that confirm the scope of my learning — from a complete Python backend path to a conscious, responsible AI workflow.

CORE CERTIFICATEMAIN PROFESSIONAL CERTIFICATE

LearnIT

Python Developer

Certificate of completion — full backend development path

Curator: Leszek Bartmiński · Certificate no.: PY01-11-06

Course period

27 Nov 2025 – 30 Apr 2026

Course volume

174 academic hours

Scope

8 modules · 34+ lessons

Certificate no.

PY01-11-06

A complete 174-hour Python Developer program at LearnIT: from language fundamentals and object-oriented programming, through relational database design and SQL, to applications built in Django and REST APIs in Django REST Framework. Then FastAPI and asynchronous programming, background jobs with Celery, testing, Docker, CI/CD and AWS basics.

Every module ended with working code instead of pure theory. As a result, I can design a data model on my own, expose and document an API, secure it with JWT, move heavy operations into background tasks and ship the whole thing in containers — not just explain how it works.

CERTIFICATE PREVIEW

PDF · original document

Open PDF Download PDF

Not a single workshop, but a complete backend path: 8 modules, 174 hours of classes and two real projects — StayMap Polska and PRO-KOM Service System — where I put this knowledge to work from the very first commit.

View full learning path

TECHNOLOGIES COVERED BY THE CERTIFICATE

Language and fundamentals

PythonOOPAlgorithmsData structuresExceptionsDecoratorsGenerators

Backend and APIs

DjangoDjango REST FrameworkFlaskFastAPIREST APIJWTSwagger / OpenAPIGraphQL

Data and async

PostgreSQLSQLORMSQLAlchemyAlembicCeleryCelery BeatAsyncIOWebSockets

DevOps and quality

DockerDocker ComposeGitHub ActionsCI/CDAWS basicsGit / Git FlowTestingPostman

ADDITIONAL CERTIFICATE

Ready4AI — practical AI usage in software development

The course helped me structure how I use LLMs in the development process: prompt engineering, AI-assisted code review, chatbots, AI agents, local models, MCP servers, technical documentation (BRD/PRD/SDD/TSD), and AI-supported application prototyping.

I use AI to support research, analysis, documentation and debugging — not as a replacement for thinking or responsibility for the code.

LLMPrompt EngineeringAI Code ReviewChatbotsAI AgentsLocal ModelsMCP ServersTechnical DocumentationClaudeCursorCodex

View certificate Download PDF

CONTACT

Let's talk about working together

I am looking for a Python / Fullstack Developer or Backend Developer role with Django and React / Next.js. I want to grow on real projects, learn from more experienced developers, and build applications that solve concrete business problems.

I am open to remote, hybrid, or on-site work in Poland. I usually reply within 24 hours.

Available for work