Case Studies

Real projects, real results

Digital Agency / CTO Role

Digitay: Client Work & Agency Operations

As Co-Founder & CTO of Digitay.pl, my own agency, I drive our technical vision and actively manage the company's growth. I take full personal responsibility for our team's performance, time organization, and the success of over 50 individually managed clients. I combine hands-on development with high-level team management, ensuring advanced, measurable results across custom-built websites, e-commerce stores, and complex digital strategies.

CTO

Role

50+

Individual clients

Full-stack

Development

SEO + Ads

Marketing tech

What I built

  • Build and deliver custom websites and online stores for clients using Next.js, Django, and CMS platforms (WordPress, Sellstick). From initial architecture to production deployment.
  • Optimize and fix existing WordPress and CMS-based e-commerce stores: page speed improvements, technical debt resolution, conversion-oriented UX changes.
  • Plan and execute SEO strategies: technical audits, on-page optimization, keyword research, and writing SEO-friendly blog content that drives organic traffic.
  • Create and manage Google Business Profiles for clients. Optimizing local visibility, handling reviews, and maintaining accurate business information.
  • Consult directly with clients to understand their needs, translate business goals into technical requirements, and maintain strong long-term relationships.
  • Drive the agency's active growth as Co-Founder, taking full responsibility for complex project architectures, team workload organization, and meeting tight delivery schedules.
  • Manage the development team: code reviews, task delegation, sprint planning, quality assurance, and mentoring junior developers.
  • Handle full-stack development across multiple frameworks: Next.js for performance-critical web apps, Django for backend-heavy solutions, WordPress for CMS-driven projects.
Next.jsDjangoWordPressSellstickSEOGoogle AdsGTMGA4Tailwind CSSPostgreSQL
Business Directory Platform

Katalogo.pl

Full-stack business directory platform and the largest verified business database in Poland with 71,000+ listed companies. Serves 250K to 300K unique visitors monthly with real-time search, category filtering, city-based geolocation, and individual business profile pages. Includes a partner zone, business self-registration, promoted listings, and an admin panel for content management.

71K+

Listed businesses

250-300K

Monthly visitors

4,900+

Industry categories

What I built

  • Architected the entire platform from scratch: database schema design, API layer, SSR/SSG rendering strategy, and frontend component system.
  • Built a multi-tenant data pipeline ingesting and normalizing business data from multiple sources, with automated deduplication and category mapping across 4,900+ industry categories.
  • Implemented SEO-first architecture with dynamic sitemap generation, structured data (JSON-LD), semantic HTML, and optimized meta tags. Result: strong organic visibility across thousands of long-tail local search queries.
  • Designed a scalable search system with full-text PostgreSQL search, city + category compound filtering, and instant results rendering via server components.
  • Created the 'Strefa Partnera' (Partner Zone) with business self-service: company registration, profile editing, photo uploads, and promoted listing management.
  • Performance-optimized for Core Web Vitals: lazy loading, image optimization, efficient database queries with Prisma, and edge-ready deployment.
Next.jsTypeScriptPrismaPostgreSQLPythonTailwind CSSDocker
Machine Learning / Computer Vision100% Python codebase

AI Trainer

Custom AI model development project focused on image recognition and object detection. Built and iteratively trained a machine learning model from scratch, with a pipeline for data preparation, cascade training, and HSV/edge filtering. Designed as the vision backbone for future automation bots and intelligent agents.

PythonOpenCVCascade ClassifiersComputer VisionNumPyImage Processing
Algorithms / Logic Engineering7 Repositories

C++ Algorithms & Data Structures

A collection of standalone C++ projects exploring core computer science fundamentals: sorting algorithms, queue-based data structures, file processing, and time logic. Each repo is a focused implementation of a specific algorithmic concept, built from scratch with emphasis on understanding complexity, memory management, and low-level control flow.

C++AlgorithmsData StructuresMemory ManagementPOSIXLinux
Beauty & Wellness

VacuRoll

Professional website for a body modeling studio in Warsaw, focusing on local SEO and premium user experience.

Web DevelopmentUI/UXSEO
Financial Services

PożyczkaPro

Business financing and loan advisory platform, designed for high conversion rates and lead generation.

Web DevelopmentLead GenSEO
Corporate Website

Voltage Rav Elektro

Professional digital presence for an electrical services provider, showcasing expertise and portfolio.

Web DevelopmentPerformanceUI/UX
Local Services / HVAC

Radom Klimatyzacje

Local service platform for air conditioning installation and maintenance, optimized for local search visibility.

Local SEOWeb DevelopmentConversion
Fitness & Health

Akwen Gym

Modern digital presence for a local fitness club and gym, featuring membership information and class schedules.

Web DevelopmentUI/UXMobile First
E-commerce

Sklep Dekoras

Online store offering interior decoration and design products, built for performance and sales.

E-commerceWeb DevelopmentSEO
Pest Control

Degratyzacja

Service website specializing in professional deratization and pest control, focused on urgent local conversions.

Web DevelopmentLocal SEOLead Gen
Technical Services

Lukgaz

Corporate portal for a gas installation and technical services company, detailing service offerings and credentials.

Web DevelopmentUI/UXSEO
E-commerce / Interior

Walljoy

Premium online store featuring wall decorations and wallpapers, emphasizing high-quality imagery and user journey.

E-commerceWeb DevelopmentConversion