I build products end to end and deliver complex changes in existing systems.

At x-kom, a leading Polish computer and consumer electronics retailer, I worked in an enterprise product team on the customer-facing purchase path of a platform serving 1M+ customers and processing thousands of transactions daily. I implemented substantial React/Redux changes across cart behavior, promotions, customer forms, and payment handoff. Within the team, I regularly diagnosed difficult Safari and other Apple-platform problems and worked with Product, backend engineers, QA, and reviewers through release.

A returning client needed 2 production booking systems with opposite availability rules. I built both. The first kept one room and one time slot aligned with an external reservation channel so customers could book and pay on the operator's site without creating a second calendar. The second allowed several groups to reserve the same time. I owned the booking rules, customer and payment flows, API synchronization, deployment, and production support. This is part of 9 years delivering software for 20+ clients.

LA Market Analyst is a completed Electron/TypeScript application I built and delivered for recurring real-estate research. It turns the process into separate Market Report and Property Shortlist flows with explicit sources, local data, interruption and recovery, document generation, and controlled Codex access.

PatchTrace is a Python CLI I built to record a coding-agent session and check its claims about changed files, tests, and verification against Git changes and command output. It gives reviewers a traceable record instead of asking them to trust the agent's summary.

FunnelScout is a TypeScript product for GoHighLevel agencies. I designed and built the multi-tenant system behind its subscriptions, background analysis, and authenticated dashboards. Its AI workflow runs in 3 fixed, schema-validated stages.

At x-kom, a leading Polish computer and consumer electronics retailer, I worked in an enterprise product team on the customer-facing purchase path of a platform serving 1M+ customers and processing thousands of transactions daily. I implemented substantial React/Redux changes across cart behavior, promotions, customer forms, and payment handoff. Within the team, I regularly diagnosed difficult Safari and other Apple-platform problems and worked with Product, backend engineers, QA, and reviewers through release.

A returning client needed 2 production booking systems with opposite availability rules. I built both. The first kept one room and one time slot aligned with an external reservation channel so customers could book and pay on the operator's site without creating a second calendar. The second allowed several groups to reserve the same time. I owned the booking rules, customer and payment flows, API synchronization, deployment, and production support. This is part of 9 years delivering software for 20+ clients.

LA Market Analyst is a completed Electron/TypeScript application I built and delivered for recurring real-estate research. It turns the process into separate Market Report and Property Shortlist flows with explicit sources, local data, interruption and recovery, document generation, and controlled Codex access.

PatchTrace is a Python CLI I built to record a coding-agent session and check its claims about changed files, tests, and verification against Git changes and command output. It gives reviewers a traceable record instead of asking them to trust the agent's summary.

FunnelScout is a TypeScript product for GoHighLevel agencies. I designed and built the multi-tenant system behind its subscriptions, background analysis, and authenticated dashboards. Its AI workflow runs in 3 fixed, schema-validated stages.