Portfolio

45 projects that shipped beyond my computer.

My own products, stores with a real warehouse behind them, client websites, content sites and publications. On every one I did the whole job — from the first line of code to day-to-day care. The screenshots show live, working sites.

15
SaaS products: 3
Stores: 10
Client work: 15
Own sites: 2
Publishing

Matury-Online.pl
2025–2026

SaaS / EdTech

An exam-prep platform covering eleven subjects of the Polish matura: exercises, tests and full exam simulations. Essays and open questions are graded by a model against the official examination criteria, and listening exercises in Polish, English and German are generated live. The site also runs its own exam-news section — from finding the stories, through analysis and duplicate filtering, to publishing in line with Google News requirements.

16 100+

Questions in the bank

11

Subjects
- Astro 5
- React
- Fastify
- Prisma
- PostgreSQL
- Claude Sonnet 4.6
- +4
Learn more View live
Sitario.com
2025–2026

SaaS / Subscription websites

A system that builds and runs a business website on a subscription. The client fills in a form; an agent writes the copy, designs the layout and publishes the site on their domain within an hour — including domain registration in Route 53, a certificate and email. It then keeps the site going: automated blogging, PageSpeed measurement, SEO recommendations and alerts. A separate module launches a Google Ads campaign with no ad account setup. The mobile version ships to Google Play as a PWA.

1 h

Website ready in

18

Recurring jobs
- React
- Fastify
- PostgreSQL
- Claude Agent SDK
- AWS Route 53
- AWS S3
- +4
Learn more View live
Cytado.com
2026

SaaS / AI Research

A tool that pins citations to real sources. It downloads the actual publication PDFs, reads the printed page numbers, and only then builds the footnote and bibliography — and when a source can't be found, it says so plainly. A Python worker collects and classifies the corpus in the background; the app exports to DOCX and PDF. Beyond the web app it runs as a Chrome extension, a Word and Google Docs add-in, a WordPress plugin and an MCP server for AI assistants.

5

Release channels

100%

Citations with a source page
- Next.js
- React
- PostgreSQL
- Python
- MCP Server
- Astro 5
- +4
Learn more View live
InkMagnet.com
2026

SaaS / AI Publishing

An ebook generator: a topic goes in, a finished book comes out. Research first, then chapter by chapter with verifiable sources, a cover design, and finally typesetting in XeLaTeX — a print-quality PDF along with an EPUB. Long generations run through a job queue that automatically refunds the balance if anything fails.

PDF · EPUB

Formats

~1 h

A book in
- Fastify
- Prisma
- PostgreSQL
- BullMQ
- Redis
- Anthropic Claude
- +4
Learn more View live
Smart-Copy.AI
2024–2025

SaaS / AI Content

A content generator where up to seven writing agents work on a text at once, supervised by a single director. It writes in eight languages based on search results and fetched pages, billed per character: 3.99 zł per 1,000. WYSIWYG editor, export to PDF, DOCX and HTML, plus a blog with its own CMS.

8

Languages

150

Max pages
- React 18
- Fastify
- Prisma
- PostgreSQL
- Anthropic Claude
- Stripe
- +3
Learn more View live
Silniki-Elektryczne.com.pl
2021–2025

E-commerce

An electric-motor store migrated from WooCommerce to custom code, which lifted sales by 40%. Over 2,000 products, two-way Allegro marketplace sync, payments by card, P24 and BLIK plus cash on delivery, in-house sales analytics and a Google Merchant feed.

+40%

Sales growth

2000+

Products
- Astro 5 SSR
- Fastify
- Prisma
- PostgreSQL
- Stripe
- Allegro API
- +2
Open
MaturaPolski.pl
2024–2025

SaaS / EdTech

A study platform for the Polish-language matura exam. Essays are graded by a model that consults online materials, exercises adapt to the student's level, and reviews come back on a schedule tuned for retention. The bank covers set readings, literary periods and past exam papers; accounts are free or premium, with a student leaderboard.

2000+

Questions in the bank

15+

Set readings
- React 18
- Fastify
- Prisma
- PostgreSQL
- Claude Sonnet
- Stripe
- +2
Open
Interpunkcja.com.pl
2025

SaaS / AI Tools

A proofreader for Polish punctuation, spelling, grammar and style. The model flags every error with an explanation and its exact position in the text. Google sign-in, a free plan and lifetime access for 299 zł.

5

Error categories

299 zł

Lifetime plan
- React 18
- Fastify
- Prisma
- PostgreSQL
- Claude Sonnet
- Stripe
- +1
Open
Copywriting24.pl
2025

SaaS / AI Tools

A free SEO content generator with no sign-up: three generations a day, text streams onto the screen live, with three lengths and custom keywords to choose from.
- React 18
- Fastify
- Prisma
- PostgreSQL
- Claude Haiku 4.5
Open
Smart-Edu.AI
2024–2025

SaaS / EdTech

A platform that generates term papers and academic texts: 120 pages in 20 minutes. Several agents work on the text at once, with web research along the way. Eight languages, online payments.
- React 18
- Fastify
- Prisma
- PostgreSQL
- Anthropic Claude
- Stripe
- +2
Open
Kurs-Copywritingu.pl
2025–2026

SaaS / Online course

Four copywriting courses in Polish — from the basics, through AI-assisted writing and SEO, to email marketing — under one subscription. Claude grades the exercises against rubrics and returns a score with feedback within seconds. Add a library of text patterns, an in-browser editor and progress saved to your account.

112

Lessons

223

AI-graded exercises
- Next.js
- React
- Prisma
- PostgreSQL
- NextAuth
- Anthropic Claude
- +3
Open
Maturalnie.pl
2026

Tools / EdTech

A no-sign-up toolbox for matura students: a university admission points calculator, a study planner, an exam countdown, a report-card average tool and a database of admission thresholds from 2023–2025. Thresholds laid out across five-hundred-plus degree pages, plus an exam news section.

507

Degree pages

5

Tools
- Astro 5
- TypeScript
- AWS S3
- AWS CloudFront
- Schema.org
Open
Prace-Magisterskie.pl
2026

Content / EdTech

A site about writing master's theses with AI: a step-by-step process, guides and an entry point to the generator. Dark visual identity, with content matched to thesis-writing search queries.
- Astro 5
- TypeScript
- AWS S3
- AWS CloudFront
Open
Silnik-Elektryczny.pl
2025

SEO / E-commerce

A static SEO satellite for used electric motors. CodeBuild auto-rebuilds the site after every order or stock change via webhook, plus an EventBridge cron every 30 minutes. A Lambda proxy filters products from the main store's API.
- Astro SSG
- AWS Lambda
- AWS CodeBuild
- AWS S3/CloudFront
- EventBridge
Open
Silniki-Trojfazowe.pl
2025

SEO / E-commerce

A second SEO satellite — three-phase motors only. Identical architecture: Astro SSG, a Lambda proxy, a CodeBuild pipeline and auto-rebuild. Google Consent Mode v2.
- Astro SSG
- AWS Lambda
- AWS CodeBuild
- AWS S3/CloudFront
- EventBridge
Open
Workbooks (11 publications)
2025

Publishing / EdTech

Eleven workbooks for Polish post-secondary vocational schools (massage therapy, medical care, occupational therapy): subject-matter content and full LaTeX/Quarto typesetting, with custom templates, diagrams and print-ready files.

11

Publications

1500+

Typeset pages
- Quarto
- LaTeX
- XeLaTeX
- Python
- TikZ
- BibTeX
- +1
Open
Copywriting 360° (ebook)
2025–2026

Publishing

An original ebook — 16 chapters, 250+ pages. Persuasion psychology, headlines, storytelling, SEO, e-commerce, B2B, AI. Typeset in Quarto/LaTeX with custom environments; sales handled by Stripe and Lambda.
- Quarto
- LaTeX
- XeLaTeX
- Astro
- AWS Lambda
- Stripe
Open
Sklad-Tekstu.pl
2024–2025

Agency / LaTeX

A LaTeX typesetting agency. Nine services, a portfolio with an interactive PDF viewer, a showcase gallery with a lightbox, a Content Collections blog and a contact form on Lambda with S3 presigned uploads.
- Astro
- Content Collections
- AWS Lambda
- AWS S3/CloudFront
- AWS SES
Open
Agencja-Copywriterska.pl
2025

Agency / Copywriting

A copywriting agency site. Nine services (copywriting, ebooks, LaTeX, naming, product descriptions), a Content Collections blog, testimonials and Schema.org Organization/WebSite markup.
- Astro
- Content Collections
- AWS S3/CloudFront
- Schema.org
Open
eCopywriting.pl
2024–2025

Agency / Business website

A copywriting agency site. A portfolio of content-marketing services, a company blog and a contact form on AWS SES.
- Astro
- AWS S3/CloudFront
- AWS SES
Open
CopywritingSEO.pl
2024–2025

Blog / SEO Content

A blog on SEO copywriting with articles linked into topic clusters. A contact form with attachments and full cookie-consent handling.
- Astro
- Content Collections
- AWS Lambda
- AWS S3/CloudFront
- AWS SES
Open
ZostanCopywriterem.pl
2025

Blog / Content

An educational blog about the copywriting profession, with articles linked into topic clusters.
- Astro
- Content Collections
- AWS S3/CloudFront
Open
1copywriting.pl
2025

Blog / Content

A copywriting blog with a newsletter system: a Lambda newsletter backend and a subscription admin panel.
- Astro
- AWS Lambda
- AWS S3/CloudFront
Open
Copywriting-Blog.pl
2024–2025

Blog / Content

A topical blog on copywriting and content marketing. Standard Astro SSG with AWS CDN.
- Astro
- AWS S3/CloudFront
Open
iCopywriter.pl
2024–2025

Blog / Content

A copywriting portal with articles and guides. Part of a wider network of content sites.
- Astro
- AWS S3/CloudFront
Open
Matura-Online.pl
2026

Website / EdTech

Full worked solutions to official Polish matura exam papers — step by step, with the common traps explained and every point accounted for. Ten subjects, papers from four years, each task on its own page with its own URL.

821

Solved tasks

44

Exam papers
- Astro 5
- TypeScript
- AWS S3
- AWS CloudFront
- Schema.org
Open
MatmaNaMature.pl
2026

Blog / EdTech

A maths blog for matura students: functions, sequences, geometry and probability explained in plain language, plus official exam tasks worked through step by step.
- Astro 5
- Content Collections
- AWS S3
- AWS CloudFront
Open
Kiedy-Matura.pl
2026

Tool / EdTech

A live countdown to the 2027 matura with the full exam timetable and a calendar of key dates — from declarations, through prom, to results day. A time-machine view shows what happens in each month of the exam year.
- Astro 5
- TypeScript
- AWS S3
- AWS CloudFront
Open
Magisterki.pl
2026

Guide / EdTech

A student's guide to writing a master's thesis — from picking a topic and outlining, through methodology and scheduling, to the defence. Written in plain language, with a separate section on what to do when the deadline is closing in.
- Astro 5
- Content Collections
- AWS S3
- AWS CloudFront
Open
PisaniePracy.pl
2026

Guide / EdTech

A guide to writing bachelor's and master's theses: a step-by-step process, real costs and a comparison of three paths — on your own, commissioned, or with AI. Plus a paid PDF handbook.
- Astro 5
- Content Collections
- Stripe
- AWS S3
- AWS CloudFront
Open
SilnikiTrojfazowe.pl
2026

Tools / Engineering

Six calculators for three-phase motors: rated current, torque, speed and slip, star–delta, protection sizing and a kW/HP converter. Each documented with its formula and the PN-EN standard, showing the full derivation rather than a bare result.

6

Calculators
- Astro 5
- TypeScript
- AWS S3
- AWS CloudFront
Open
AIWritingTips.com
2026

Website / English

An English-language site about writing with AI: prompts, tool comparisons and workflows for people who write for a living. Four post types, all written so they don't read as machine-generated.
- Astro 5
- Content Collections
- AWS S3
- AWS CloudFront
Open
TorWeb.pl
2025

Web agency

The site of my own web agency. Twelve case studies, six service pages, dark/light mode, GDPR, GA4 + GTM.
- Astro 5
- TypeScript
- Tailwind CSS
- GA4
- GTM
- AWS S3/CloudFront
Open
Nadamel.pl
2025

Business website

A carpentry company — board cutting and edge banding. Eight service pages, Lighthouse 98+.
- Astro
- TypeScript
- Tailwind CSS
- AWS S3/CloudFront
Open
UniaTorun.pl
2025

Sports / Business website

A football academy. Seventeen pages, a custom video player, sign-up forms, GDPR + Consent Mode v2.
- Astro 5
- TypeScript
- Tailwind CSS
- GA4
- GTM
- AWS S3/CloudFront
Open
GrandKuchnie.pl
2025

Business website

A made-to-measure kitchen manufacturer. A CMS-backed portfolio, a lightbox gallery, Google Analytics + Ads.
- Next.js
- Prisma
- React
- AWS S3
- Tailwind CSS
Open
ArtKuchnie.pl
2024–2025

Business website

Made-to-measure kitchens. A project gallery, SEO optimisation, PageSpeed 80–90.
- Astro
- Tailwind CSS
- AWS S3/CloudFront
Open
Mekra.pl
2024–2025

Business website

A manufacturer of frame-panel furniture fronts. Extensive subpages and a contact form on Lambda with S3 presigned uploads.
- Astro
- Tailwind CSS
- AWS Lambda
- AWS S3/CloudFront
Open
By-Interior.pl
2025

Portfolio / Design

An interior design studio. Portfolio, team, testimonials. Serverless Lambda backend.
- Astro 4
- TypeScript
- Tailwind CSS
- AWS Lambda
- AWS S3/CloudFront
Open
Project-Design.pl
2024

Portfolio / Design

An interior design office from Toruń. Cloudinary, project filtering, Lighthouse 98+.
- Astro
- Cloudinary
- AWS S3/CloudFront
- Tailwind CSS
Open
Meble-Bydgoszcz.pl
2024–2025

Business website

Made-to-measure furniture. Live Google reviews via the Places API on serverless Lambda, a blog, GitHub Actions deployment.
- Astro
- AWS Lambda
- Google Places API
- AWS S3/CloudFront
Open
MebleSystem.pl
2026

Business website

The site of a made-to-measure furniture maker from Toruń, built out for local visibility. A portfolio with galleries, a how-to blog, a free quote form and separate offer pages for Toruń, Bydgoszcz, Włocławek, Inowrocław, Grudziądz and the Tricity. Static Astro on CloudFront, light and dark themes, WebP images in several sizes.

110

Pages

27

Portfolio projects
- Astro 5
- TypeScript
- AWS S3
- AWS CloudFront
Open
Praca-Magisterska.pl
2025

Content / EdTech

30+ guides on writing master's theses. 2,000+ topics across 20+ fields of study, a methodology section (12 articles), ebooks sold through Stripe/Lambda, Smart-Edu.AI integration.
- Astro
- Tailwind CSS
- AWS Lambda
- Stripe
- AWS S3/CloudFront
Open
MagisterkaOnline.com.pl
2025

Content / EdTech

30+ guides on writing a master's thesis, with an extensive methodology section (16 articles).
- Astro 5
- TypeScript
- Tailwind CSS
- AWS S3/CloudFront
Open
Licencjackie.pl
2025

Content / EdTech

A portal on bachelor's theses. Guides, thesis topics, formatting and citation.
- Astro
- Tailwind CSS
- AWS S3/CloudFront
Open

What it's built with

The technologies that keep coming back across these projects — sorted by how often I use them. Each one is backed by at least a few deployments.

AWS S3/CloudFront ×21
Astro ×16
Astro 5 ×15
AWS S3 ×14
Stripe ×13
Tailwind CSS ×12
PostgreSQL ×11
TypeScript ×11
Prisma ×10
AWS CloudFront ×10
AWS Lambda ×10
Fastify ×9
AWS SES ×8
Content Collections ×8
React ×5
React 18 ×5
Anthropic Claude ×4
Next.js ×3

Contact

Have a product that should reach further than your own website?

I take it from start to finish: the app, the infrastructure, store and directory releases, ongoing maintenance. I usually reply the same day — ideally to something concrete, even if it's one paragraph and the question “can this be done cheaper?”.