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Portfolio

Things we've shipped

Systems we built and shipped end to end. MVPs, SaaS products, e-commerce systems, operational apps and client work under NDA. Concrete numbers, real stacks.

Operational case studies

Custom systems delivered for real brands, with measurable time and cost savings. Video walkthroughs and output below.

KW Podatki

Site for an accounting office, with a panel they run themselves

Design and build of kwpodatki.pl for K&W Biuro Prawno-Rachunkowe (Plewiska near Poznań). A marketing site with a dedicated page per service and a Polish-language CMS panel where the office publishes its own knowledge-base articles without going through us.

▹Client-run CMS panel (posts, media, partners)
▹Dedicated page per service
▹Mobile-first, no UI framework

Next.js 16React 19Payload CMSPostgreSQLTypeScriptCSS Modules

Downloading offers & images from marketplaces

ECU Flow

Automated ECU listing on Allegro & Ovoko

End-to-end system that scrapes ECU offers and images from marketplaces, sorts photo quality, classifies parts and validates part numbers, sets prices, and publishes complete listings to Allegro and Ovoko. It turns a slow, manual process into a hands-off pipeline.

▹Thousands of ECUs processed per day
▹80-90% faster listing preparation
▹6 variant images per listing + part-number validation

PythonAllegro APIOvoko APITkinter GUIasync pipelineOCR

Automated product mockups

Automated product mockups

Pray For Merch

AI graphic & sales-content automation for an apparel brand

Automated the full creative-to-publish loop for a print-on-demand apparel brand: AI generates designs (TXT2IMG) and copy (LLM/VLLM), renders product mockups via ComfyUI + Photoshop, and publishes listings and social content at scale.

▹1789+ listings published
▹7156+ mockups generated
▹85% faster preparation time

ComfyUITXT2IMGLLM / VLLMPhotoshop automationPythonMarketplace APIs

AI book-idea generation (LLM)

KDP Coloring Book Creator

Automated coloring-book production for Amazon KDP

Pipeline that generates coloring-book illustrations, mass-vectorizes and optimizes them, builds KDP-compliant interior PDFs and dynamic covers. The result is print-ready books that need almost no manual work.

▹70-80% reduction in production time
▹KDP-compliant interior & cover files
▹Dynamic cover generation per page count

PythonTXT2IMGvectorizationPDF generationAmazon KDPcover generator

Products

Multi-Channel Auto-Parts SaaS

One panel for Ovoko, Allegro and eBay

Multi-tenant SaaS automating used-car-parts sales across Ovoko, Allegro and eBay simultaneously (which BaseLinker can't do). AI-generated descriptions, OCR part classification, stock sync. Currently in closed beta.

▹Multi-tenant (companies, users, plans)
▹Ovoko + Allegro + eBay integration
▹AI descriptions + OCR classification

FastAPI (hexagonal)Next.jsGemini / Vertex AICloud Vision OCRStripeCelery

Product landing page

Product landing page

Zesply · Project Management SaaS

Kanban, time tracking, estimates and a client portal

Project management and team collaboration for small agencies. Kanban, time tracking, estimates, budgeting and a client portal. EU-compliant and self-hostable.

▹65 API endpoints, 24 DB tables
▹Multi-tenant with RBAC
▹i18n (PL/EN) + a11y tested

Next.js 16React 19DrizzlePostgresBetter Authnext-intl

Visual node-canvas builder

Visual node-canvas builder

Fynnelx · Real-Time Funnel Builder

Node canvas, outcome simulation, live multiplayer

Visual marketing-funnel builder with a node canvas, Monte Carlo outcome simulation, real-time multiplayer editing and AI analysis. 56 ready templates across 8 categories.

▹40+ node types, 56 templates
▹Monte Carlo simulation (1000 iterations)
▹Real-time multiplayer (Yjs CRDT)

Next.js 16React 19FastAPIYjs CRDTClaude APIPostgresDocker

POD & KDP Automation Engine

Idea to published, on local AI

Fully automated pipeline for print-on-demand and KDP: AI idea generation, image generation on local ComfyUI, processing and multi-marketplace publishing. Zero AI-API cost via local Ollama.

▹11-stage POD pipeline, 8-stage KDP
▹63 API endpoints, ~124K lines
▹Local AI generation (zero API cost)

PythonComfyUIOllamaFastAPICelerypgvectorReact

ATP Tennis Prediction Engine

Finds value bets with a proven edge

Machine-learning system predicting ATP tennis outcomes and scanning for value bets against bookmaker odds. Walk-forward validated (no look-ahead bias), with anti-detection scraping and Telegram alerts.

▹67.6% backtest accuracy
▹16,138 predictions across 69 walk-forward periods
▹+10.6% ROI (5% threshold), positive CLV

PythonXGBoostLightGBMOptunaSHAPPatchrightPostgresStreamlit

Client work under NDA

Delivered for clients; shown without names or identifying details per confidentiality agreements. Happy to walk through the architecture and our role on a call.

E-commerce recommendation system (AI)

Personalized product recommendations

AI recommendation engine for e-commerce with embedding models and a REST API, integrated into the store and marketplaces, with ETL and monitoring. Running 24/7.

▹+12-15% conversion
▹+10-14% average cart value
▹24/7 automation

Pythonembedding modelsREST APIWooCommerce / AllegroETLmonitoring

Conversational LLM chatbot

E-commerce customer-service assistant

LLM-powered chatbot integrated with the client's CRM, with an async processing pipeline and A/B testing. Responds in seconds and runs stably 24/7.

▹Relieves customer service 60-70%
▹Response time in seconds
▹Stable 24/7

LLMCRM integrationCeleryDockerA/B testing

AI-assisted business reports

Automated reporting with summaries

Automated business reports with AI summaries and recommendations, eliminating manual errors. ETL from SQL/CSV, scheduled, with notifications and PDF/DOCX export.

▹Reports in minutes
▹Auto summaries + recommendations
▹Error elimination, 24/7

ETL (SQL/CSV)AirflowLLM APISlack / e-mailPDF / DOCX

Dynamic pricing system

Real-time e-commerce repricing

Dynamic pricing for several thousand products with real-time recalculation, notifications and monitoring. Backend in Python/FastAPI with a LightGBM model and Redis.

▹+12% conversion from Ceneo
▹+6% margin
▹24/7 for several thousand products

PythonFastAPILightGBMRedisDockermonitoring

OCR + AI document analysis

Automated business-document processing

OCR + AI system extracting and validating data from business documents at scale, with alerts and an Airflow workflow. Handles hundreds of documents per day.

▹90% less manual data entry
▹Validation + alerts
▹Hundreds of documents/day

Google OCROpenCVLLM APIAirflowDockerSMTP / Slack alerts

Multi-shop B2B platform

Auto-deployment of 100+ independent stores

Platform spinning up independent catalog stores (each isolated) with a central lead-management panel. New store provisioned in 5-15 minutes.

FastAPI asyncWooCommerce automationGeminiDockerTraefik

AI e-learning SaaS

AI-generated courses + SCORM + credits

SaaS generating e-learning courses via AI (structure + images), with SCORM publishing, a consumption-based credit system and an LMS. Major authored contribution on top of a base scaffold.

Supabase Edge FunctionsGeminiStripeGCP / TerraformReact

Government filing platform

Automated compliance document submission

Web app submitting compliance documents to a national registry end-to-end: search, verification, payment and automated filing via an XML gateway (iXBRL generation).

Next.jsStripeXML GatewayiXBRL / GovTalkMariaDB

Bidirectional discovery engine

Company ↔ product mapping from marketplaces

Engine mapping companies to products (and back) from B2B marketplaces using stealth scraping and a cascading AI extraction pipeline with confidence scoring.

Python asyncPatchright (stealth)GeminiJSON-LD → visual → LLM extraction

Rental/leasing marketplace

Mobile app + KYC + payments

Rental marketplace with identity verification (KYC), payments and contract generation. Authored the mobile application (React Native).

React Native / ExpoNode/ExpressMongoDBOnfido KYCTPay

ERP migration & sync

Daily Vendo → Comarch Optima sync

Data migration and daily synchronization between a legacy ERP and Comarch Optima via its COM API. A polyglot Python and C# solution.

PythonC# .NET48 (COM Interop)SQL ServerPostgreSQL

Company data enrichment

Multi-source registry enrichment

Tool enriching company datasets from public registries (GUS, CEIDG, KRS) plus website contact extraction, with multi-level confidence scoring and checkpoint/resume.

PythonPlaywright + PatchrightGUS SOAP APIGemini

More we've built

AI Ebook Generation Engine

Series to Amazon KDP and Google Play

Generates series of short ebooks via LLM with a 4-level outline, quality control, copyright verification and export to Amazon KDP / Google Play. EPUB 3.0 / MOBI / PDF / ONIX.

▹6 languages × 3 platforms
▹4-level hierarchical outline
▹Real-time copyright checks

PythonGeminiOllamaFastAPICeleryNext.js

AI Language Tutor (mobile)

Learn by talking, on self-hosted GPU

Mobile app for learning languages through natural conversation with an AI tutor, using implicit error correction. Runs a self-hosted GPU inference stack instead of paid APIs.

▹Self-hosted GPU inference (Whisper + Orpheus)
▹Real-time audio streaming
▹STT ~30x realtime

FastAPIReact Native / ExpoWhisperOrpheus TTSGeminiWebSocket

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