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PRODUCT / FULL-STACK / SYSTEMS

Paweł Gałkowski

I design and deliver digital products and platform systems that combine strong user experience, robust engineering, and measurable business value.

FULL-STACK ENGINEERINGSYSTEM ARCHITECTUREPRODUCT DELIVERY
EXPLORE PROFILE

SYSTEM MODEL / REFERENCE

PRODUCT / INTENT / OUTCOMES

The context and outcomes a system exists to support.

CONCEPTUAL MODEL / NO LIVE SYSTEM DATA

01ENGINEERING PROFILE

I build software that balances product ambition with engineering discipline.

  • 01 / ARCHITECTURE

    Designing systems that are maintainable, scalable, and aligned with real business constraints.

  • 02 / PRODUCT MINDSET

    Connecting user needs, business goals, and technical decisions into meaningful product outcomes.

  • 03 / FRONTEND EXECUTION

    Creating interfaces that are fast, intuitive, consistent, and built for real-world usage.

  • 04 / BACKEND & DELIVERY

    Shipping reliable APIs, workflows, and product features with ownership from implementation to iteration.

02ENGINEERING TIMELINE

A product and platform career built through delivery, systems thinking, and iteration.

01

2016 · FOUNDATIONS

Started translating product ideas into usable interfaces and maintainable frontend solutions, with a focus on clarity, user value, and reliable delivery.

02

2019 · SYSTEMS

Expanded into data flows, service boundaries, and cross-team integration patterns that reduced complexity and improved delivery predictability.

03

2022 · PRODUCT ENGINEERING

Worked across discovery, engineering planning, and implementation to keep technical choices aligned with business outcomes and user needs.

04

2025 · OPERATIONS

Focused on resilience, observability, and long-term product quality so systems continue delivering value beyond the initial release.

03REFERENCE SYSTEMS

Reference architectures shaped by operational constraints.

PROJECT / 01

ILLUSTRATIVE MODEL / NOT A CLIENT PROJECT

Sports Venue OS

An illustrative reference model for connecting reservations, access, scoring, tournaments and venue operations.

This concept explores how customer and staff workflows could share one operating model rather than rely on disconnected tools.

WEBMOBILEBACKENDARCHITECTURE

CHALLENGE

  • Separate customer and employee workflows
  • Handle reservations and resource locking
  • Provide live scoring and venue state

DESIGN GOALS

  • A unified operational model
  • Visible real-time state
  • Traceable administration

DECISIONS

ProblemVenue operations are split across multiple touchpoints and the same state is represented differently in each one.

DecisionCreate one shared operational model for booking, access and live venue status.

ReasoningA single source of truth reduces coordination effort and keeps the customer experience aligned with actions taken by staff.

ProblemRealtime updates must be trustworthy under concurrent access.

DecisionUse event-driven state transitions and authoritative writes for bookings and reservations.

ReasoningThis keeps urgent decisions visible to the team without handing off control to inconsistent client-side local state.

REFERENCE STACK

  • Next.js
  • React
  • React Native
  • NestJS
  • PostgreSQL
  • WebSockets
  • Docker
VIEW REFERENCE MODEL →
04ARCHITECTURE LAB

Don't take my word for it. Interact with the systems.

DEMO / API FLOW

LOCAL SIMULATION / NO NETWORK REQUEST

  1. CLIENT
  2. EDGE
  3. API
  4. SERVICE
  5. DATABASE
  6. RESPONSE
TIME / DEMONOT MEASURED
STATUS / DEMOIDLE
TYPEREAD

DEMO / SCALE MODEL

ILLUSTRATIVE TOPOLOGY / NOT A CAPACITY BENCHMARK

1025k100k
  • CACHE
  • QUEUE
  • REPLICAS
  • READ REPLICAS
  • CDN

DEMO / REAL-TIME

WebSocket event relay

LIVE WEBSOCKET / TWO INDEPENDENT CLIENTS

BROWSER A

Publisher

CONNECTIONCONNECTING

No event published yet.

BROWSER B

Receiver

CONNECTIONCONNECTING

Waiting for Browser A.

05CONTACT TERMINAL

Open a channel when the system needs a human.

OPEN CHANNEL

CHANNEL STATUSSTANDBY
06OPERATING PRINCIPLES

How I approach engineering decisions.

  1. 01

    MAKE COMPLEXITY EXPLICIT

  2. 02

    OPTIMIZE FOR CHANGE

  3. 03

    OBSERVE BEFORE OPTIMIZING

  4. 04

    BORROW COMPLEXITY, DON'T INVENT IT

  5. 05

    SHIP SMALL, LEARN FAST

  6. 06

    A SYSTEM IS MORE THAN ITS CODE