az.
EN
Email me

Full-stackdeveloper

I've been building frontends and backends for six years, and I set up the servers they run on.

Get in touch
Aleksander Załuczkowski

Hi, I’m

Aleksander Załuczkowski

I live in Silesia and Lower Silesia, Poland, and work remotely. I specialise in SaaS and payment systems, where no transaction may go missing or go through twice.

Download CVPDF, one page

Polish (native), English and German (C1).

What I do

See projects

Payments and invoicing

Subscriptions, invoices in KSeF (Poland's national e-invoicing system) and reconciliation with accounting.

  • Subscriptions and checkout
  • KSeF invoices
  • No duplicate invoices
  • Accounting integration

Web applications

From the database to the dashboard your team works in.

  • Next.js and React
  • Node.js and .NET
  • PostgreSQL and Prisma
  • APIs and webhooks

Servers and deployments

I set up and run the servers these apps live on.

  • Docker Compose
  • CI/CD with migrations
  • Caddy and Linux
  • Scheduled job monitoring

Selected projects

Everything on GitHub
  1. Next.js · Prisma · PostgreSQL · 2026

    A subscription hub for several apps

    Several apps needed recurring payments. Instead of a separate integration for each, I built one service with plans, subscriptions and signed notifications.Built at Halo; the code is in the company's private repository.     Code from the project: A subscription hub for several apps
  2. Node.js · PostgreSQL · KSeF · 2026

    Milestone invoices sent to KSeF

    An automated job invoices each project milestone and makes sure no invoice reaches KSeF (Poland's national e-invoicing system) twice, even if a server response is lost.Built at Halo; the code is in the company's private repository.     Code from the project: Milestone invoices sent to KSeF
  3. ASP.NET Core 8 · Vue 3 · 2026

    Community photo archive

    Residents upload archival photos of their area with a description and the place they were taken, which then shows up on a map. An admin approves every photo before it goes public.Code on GitHub     Code from the repository: Community photo archive
  4. .NET 10 · React 19 · 2026

    Real-time chat

    Public rooms and private conversations over SignalR, with read receipts. The backend follows Clean Architecture with CQRS.Code on GitHub     Code from the repository: Real-time chat

What I work with

TypeScript, C#, SQL · Next.js, React · Node.js, .NET, Prisma · PostgreSQL, Redis · Docker Compose, CI/CD, Caddy, Linux, Azure · Azure OpenAI · HMAC, OAuth 2.0, KSeF

Experience

  • since 2024Full stack developerHalo Sp. z o.o. · remote
  • 2022–2024Junior full stack developerempty_fields · remote
  • 2020–2022Freelance, own projectsself-employed · remote
  • 2023–2025Master's degree, Production Management and EngineeringWrocław University of Science and Technology
  • 2018–2023Engineer's degree, Mechanical Engineering (Power Machinery)Wrocław University of Science and Technology

Contact

Looking for a new team

Ideally remote, at a company building its own product. Email or call; I usually reply the same day.

aleksanderzaluczkowski@gmail.com

+48 537 735 589 GitHub LinkedIn CV as PDF