Patryk Kozieł - Agentic Product Engineer

Building production-ready full-stack mobile and web experiences.

Agentic Product Engineer · Frontend / Fullstack

I build polished React / TypeScript products with full-stack delivery: commerce features, AI-assisted workflows, clear UX, API integration, and maintainable handoff.

2018 - Present

2021 - Present

Main production work

E NET PRODUCTION

Software Engineer

Large-scale e-commerce delivery for retail brands used by millions.

Selected brands I contributed to through E NET PRODUCTION

Selected production work through E NET PRODUCTION for large retail e-commerce platforms, including Media Expert, JD Sports, KLER, CCC, Bricomarché, Sizeer, Agata Meble, KROSS, and electro.pl.

Responsibilities

Delivered production frontend features for high-traffic e-commerce platforms.
Worked with TypeScript, Vue, REST APIs, and GraphQL.
Handled product flows, edge states, performance, and maintainable handoff.
Collaborated in a large engineering environment with reviews and delivery standards.

Stack

TypeScriptVueREST APIsGraphQL

Delivery context

Commercial e-commerce systems, product flows, edge states, code reviews, delivery standards, QA support, and maintainable handoff.

2024 - Present

AI product systems

Coderno

Agentic Product Engineer / Product Builder

AI-assisted product builds, agentic workflows, and full-stack prototypes connecting product UX, LLM integrations, and production-ready engineering.

Axis HealthOrangeriaAI workflowsProduct demosAxis HealthOrangeriaAI workflowsProduct demosAxis HealthOrangeriaAI workflowsProduct demosAxis HealthOrangeriaAI workflowsProduct demos

Current AI product work

Coderno is the current product and engineering track behind AI-assisted mobile and web products, including Axis Health and Orangeria, plus internal automation workflows and production-ready prototype delivery.

Responsibilities

Built AI-assisted product prototypes and production-oriented MVPs from product idea to usable web or mobile flows.
Integrated LLM features around structured outputs, fallback states, prompt iteration, and user-facing AI workflows.
Connected polished React / TypeScript interfaces with Supabase, edge functions, APIs, and automation-oriented backend logic.
Used coding agents, MCP-style workflows, and AI-assisted engineering loops for implementation, refactoring, debugging, and product iteration.

Stack

ReactTypeScriptSupabaseOpenAI APIClaude APILLM workflowsRAGMCP

Delivery context

Product discovery, UX structure, full-stack implementation, LLM/API integration, automation flows, demo readiness, and maintainable handoff.

2021

Product & landing builds

Artify

Frontend Developer

Product-facing landing pages, sales flows, calculators, and interactive web interfaces, including work for Asseco BS and Software Mind.

Selected Artify project exposure

Artify delivery included project work connected with Asseco Business Solutions and Software Mind, focused on polished product-facing web experiences.

Responsibilities

Developed landing pages and web interfaces using HTML, CSS, JavaScript, and React.
Built interactive features such as subscription calculators and configurators for product and sales flows.
Collaborated with cross-functional teams in agile environments, turning feedback into clear, usable iterations.

2020 - 2021

Early full-stack work

Yango

Full-Stack Developer

Maintained and extended Yango.pl e-commerce with custom features, while improving internal IT-backed processes and supporting product work around GameLabs and DesireLabs.

Yango.plGameLabsDesireLabs

Product context

The role covered Yango.pl e-commerce maintenance, new custom feature development, and improvements to internal operational processes from the IT side. It also included product work around GameLabs and DesireLabs.

Responsibilities

Maintained and extended Yango.pl e-commerce with new custom features and frontend/backend-connected improvements.
Improved internal business processes from the IT side, reducing manual operational friction where possible.
Created and maintained responsive e-commerce platforms and web applications using PHP, JavaScript, and modern frontend technologies.
Built practical product interfaces while developing the foundations for later production frontend work.

2019 - 2020

Early full-stack work

XMedia

Full-Stack Developer

Early web and e-commerce delivery with frontend implementation and PHP-backed systems.

2018 - 2022

WSEI

Wyższa Szkoła Ekonomii i Informatyki w Krakowie

Informatics and Econometrics - Mobile Application Programming

Program focus

A technical degree focused on building mobile and full-stack application systems, connecting software engineering fundamentals with product planning, interface design, delivery workflows, and production readiness.

Covered areas

Designed mobile application architecture: screen flows, separation of concerns, client-server boundaries, reusable modules, state handling, and maintainable project structure.
Practiced mobile view design by translating requirements into usable screens, navigation patterns, forms, data displays, and interaction states.
Built C# and .NET applications, strengthening object-oriented programming, API-oriented thinking, backend structure, validation, and maintainable business logic.
Worked with relational databases, data modeling, queries, persistence layers, and the connection between application features and underlying data structures.
Covered CI/CD and production deployment workflows: version control, build automation, release preparation, environment configuration, and repeatable delivery habits.
Developed DevOps foundations around collaboration, repository hygiene, deployment awareness, infrastructure basics, and keeping software ready for real users.

Technologies and practice

React NativeC#.NETDatabasesCI/CDDevOpsMobile UIBacklog Planning

Engineering project

Engineering project: planned and delivered a full-stack React Native mobile application, including product discovery, market research, backlog breakdown, team collaboration, feature prioritization, sales assumptions, and marketing / go-to-market planning.

Selected builds

Axis HealthCo-founded a mobile wellbeing MVP combining habits, Apple Health data, Supabase, Edge Functions, and LLM-based insight generation.

OrangeriaDelivered a consumer AI plant-care app with photo diagnostics, watering reminders, push follow-ups, LLM fallback, and React / Capacitor / Supabase backend.

LoyalnyBuilt a B2B SaaS loyalty platform for local businesses with NFC-first customer flows, multi-tenant dashboard, analytics, and subscription model.

Garage ManagementSolo-built a workshop inventory SaaS / mobile MVP with barcode and VIN scanning, smart search, Supabase RLS, and faster part entry in pilot.

Axis HealthCo-founded a mobile wellbeing MVP combining habits, Apple Health data, Supabase, Edge Functions, and LLM-based insight generation.

OrangeriaDelivered a consumer AI plant-care app with photo diagnostics, watering reminders, push follow-ups, LLM fallback, and React / Capacitor / Supabase backend.

LoyalnyBuilt a B2B SaaS loyalty platform for local businesses with NFC-first customer flows, multi-tenant dashboard, analytics, and subscription model.

Garage ManagementSolo-built a workshop inventory SaaS / mobile MVP with barcode and VIN scanning, smart search, Supabase RLS, and faster part entry in pilot.

Skills

TypeScript, JavaScript, Python
React, Next.js, Vue.js, HTML, CSS
Node.js, REST APIs, GraphQL
OpenAI API, Claude API, LLM integrations
Coding Agents, MCP, RAG
Supabase, Capacitor, Git, CI/CD
Design Systems, Figma, UI handoff
Product UX, discovery, tradeoffs
Demos, handoff, reusable workflows

AI & Tools

Coding agents in daily work
LLM APIs: OpenAI, Claude
RAG, embeddings, semantic search
Structured outputs & function calling
Prompt design and iteration
AI vision, OCR, HealthKit
Edge Functions, API integrations
Figma, UI handoff workflows

Languages

English: B2+ / Advanced
Polish: Native

What kind of engineering work do you focus on?

Polished React / TypeScript product builds, TypeScript-heavy commercial frontend work, and full-stack delivery around auth, API contracts, state, loading and error edges, performance constraints, and maintainable architecture.

Where has the production work shipped?

Through E NET PRODUCTION, across large retail e-commerce systems serving millions of users in Europe, including Media Expert, MediaMarkt, CCC, JD Sports, Sizeer, and Agata Meble.

How do you use AI in product work?

Daily coding-agent workflows for implementation, refactoring, debugging, tests, and documentation, plus hands-on work with OpenAI / Claude APIs, RAG, tool use, prompt design, automation, fallback states, re-ask paths, and reviewable outputs.

Which projects show the product range?

Axis Health, Orangeria, Loyalny, and Garage Management: mobile wellbeing, plant-care AI, B2B loyalty SaaS, and workshop inventory SaaS / mobile MVP work.

What is the education background?

Informatics and Econometrics - Mobile Application Programming at Wyższa Szkoła Ekonomii i Informatyki w Krakowie, 2018 - 2022. The program covered mobile architecture, screen design, C# / .NET, databases, CI/CD, DevOps fundamentals, and a full-stack React Native engineering project with discovery, market research, backlog planning, collaboration, and go-to-market work.

Feel free to contact

Let’s build above the obvious.

I look for work that raises the room: ambitious products, sharp people, and the patience to make every detail feel intentional.

Call me

Patryk

Kozieł

Experience & education

E NET PRODUCTION

Coderno

Artify

Yango

XMedia

Wyższa Szkoła Ekonomii i Informatyki w Krakowie

AI & product projects

Skills

AI & Tools

Languages

What kind of engineering work do you focus on?

Where has the production work shipped?

How do you use AI in product work?

Which projects show the product range?

What is the education background?

Let’s build above the obvious.