Web apps
React, TypeScript and modern interfaces
Junior Backend Developer · Python & TypeScript
Hi, I’m Kacper.
I build backends
that actually work.
Computer Science student in Gdańsk looking for a junior backend role or internship. I build self-hosted apps on Node.js and PostgreSQL, Python tools for computer vision, and ship them with Docker.
about_me.py
me = Developer(
role="backend",
level="junior",
stack=[
"Python", "TypeScript",
"PostgreSQL", "Docker",
],
city="Gdańsk, PL",
open_to="junior roles",
)01 · About
Quick facts
Based in
Gdańsk, Poland
Focus
Web, backend, AI and homelab infrastructure
Learning style
Build → break → fix → deploy
Outside code
Gym, cars, fishing and hands-on projects
02 · Toolbox
What I build
Backend
Node.js, Fastify, Python, PostgreSQL and REST APIs
AI experiments
CNNs, computer vision and local LLMs
Homelab
Linux, Docker, Proxmox, self-hosting and networking
03 · Work
Selected work
Self-hosted apps, a bit of machine learning and a website for a local company. Explore case studies, visuals and links to available source code below.
Status: Ongoing
Fishing Forecast
Purpose
A self-hosted fishing planner for Koszalin: a 0–100 score for each spot and species, built from weather data with every factor explained, plus the best time windows and a 7-day outlook.
- Fastify + PostgreSQL API: accounts, sessions, synced spots and a shared weather cache
- Deterministic scoring: 8 weighted factors, species rules capped at ±12 points
- 70 Vitest tests; CI runs lint, typecheck, tests and a Docker build
- TypeScript
- Fastify
- PostgreSQL
- React
- Vitest
- Docker
Status: Ongoing
GymTracker
Purpose
A private, mobile-first app for workouts, training plans, body measurements, goals and supplements, built to self-host with Docker and use over Tailscale.
- Fastify 5 + Zod + Prisma API on PostgreSQL 17: 13 models, 4 migrations
- npm-workspaces monorepo: API, React client and a shared package
- Docker Compose with Nginx, built to run on a home server
- TypeScript
- Fastify
- Prisma
- PostgreSQL
- Zod
- React
- Docker
Blockout Website
Purpose
A marketing site for a large-format print and signage company in Koszalin, built to turn visits into quote requests.
- React 19 + TypeScript with a plain-CSS, token-based design system
- Build-time SEO: meta, Open Graph, schema.org LocalBusiness and FAQPage
- Contact form with Zod validation and two anti-spam checks; Docker + Nginx
- TypeScript
- React
- Vite
- Zod
- CSS
- Docker
- Nginx
65%test accuracy · 7 classes
Status: In progress
Facial Expression Recognition
Purpose
A CNN trained from scratch to classify seven facial expressions, served through a FastAPI web app with live webcam input.
- 65% accuracy on 7,178 held-out 48×48 test images
- One OpenCV preprocessing path shared by training, evaluation and inference
- Classification report, confusion matrix and training curves in the repo
- Python
- Keras
- OpenCV
- FastAPI
Code review · process diagram
- GitHub API: student's repos
- fetch the source code
- Ollama (local LLM) review
- parse JSON: line, severity
- save to student history
Student Progress Analyzer
Purpose
A desktop app for teachers: groups, tasks and attendance, automatic grading on the Polish 2.0–5.0 scale, and AI review of students' GitHub code with a local LLM.
- JWT-protected Express + MongoDB API with about 30 endpoints
- AI code review of students' GitHub repositories with a local model (Ollama)
- Automatic grading on the Polish scale; CSV import, CSV and Excel export
- TypeScript
- Node.js
- Express
- MongoDB
- React
- Electron
- Ollama
Source code is not publicly availableCase study: Student Progress Analyzer
Image processing · process diagram
- load image
- resize (OpenCV)
- remove background (optional)
- Real-ESRGAN x4 · CUDA/CPU
- unsharp mask
- save result
AI Upscaler
Purpose
A desktop app that upscales photos 4× with Real-ESRGAN, with optional background removal, running on the GPU when one is available.
- Real-ESRGAN x4 on CUDA with FP16, CPU fallback
- Optional background removal with rembg before upscaling
- CustomTkinter GUI with a worker thread; packaged as an .exe with PyInstaller
- Python
- PyTorch
- Real-ESRGAN
- rembg
- OpenCV
- CustomTkinter
04 · Repositories
Code lives here.
Fetching public metadata from GitHub…
05 · Personal note
Outside the terminal
I enjoy strength training, cars, fishing and building things outside of software too. I like projects that start as an idea, turn into a problem, and eventually become something useful.
06 · FAQ
A few more answers.
What kind of role are you looking for?
I am looking for a junior backend developer role or an internship. I study Computer Science in Gdańsk and want to develop my skills building APIs, server applications and integrations.
Which technologies do you work with?
I mainly use TypeScript, Node.js, Python and PostgreSQL. My projects also use Fastify, Express, FastAPI and Docker. I choose tools for the problem; each case study explains the stack.
Where can I explore your projects?
Selected work includes descriptions, technology choices, screenshots or diagrams, and setup instructions. Public repositories are linked on GitHub. Not every project has an online demo.
Can I download your CV?
Yes. The Download CV button at the top of the page opens a PDF. Get in touch if you would like more information about my projects or experience.
What is the best way to contact you?
Email kacper.blok@gmail.com or contact me on LinkedIn using the links in the contact section. I am happy to discuss junior roles, internships or a specific collaboration.
07 · Contact
Let’s build something useful.
I am open to junior roles, internships, collaborations and interesting technical conversations.