Leonardo Zelenski
Hand me the problem, I'll make the lemonade.
Fast websites for local businesses. Solid backend for teams.
Websites for local businesses
Restaurants, clinics, hotels, dance schools… A fast, good looking website that is easy to find on Google, built around each business.
Taking on new projects
Who it's for
- Restaurants
- Clinics
- Pharmacies
- Hotels
- Dance schools
- Theatres
- And other local businesses
How it works
Chat
A short chat to understand the business and what it needs.
Proposal
A clear proposal with a fixed timeline and price.
Live site
The site goes live, fast and ready for customers.
Projects built from scratch
Demos for businesses and personal projects, from the operating system to a recycling map.
Casa do Beco
An Alfama tavern with a seasonal menu, opening hours, a map and one tap bookings on a phone. Blue and white tile identity.
ConteúdoAstroHTML estático
- Lighthouse ≥ 0.9 on a phone
- No accessibility errors (axe)
- Astro
- HTML
- CSS
Clínica Aurora
A family clinic with specialties, a team page and an appointment booking flow, as in a Django site with an admin area.
FormulárioHorários livresConfirmação
- Booking in three steps
- Tested end to end (Playwright)
- Astro
- HTML
- CSS
Estúdio Compasso
A dance school with a weekly class timetable, teachers and a one tap trial class request.
ConteúdoAstroHTML estático
- Weekly timetable readable on a phone
- Free class request already filled in
- Astro
- HTML
- CSS
NixOS dotfiles
My whole system in one repository: NixOS with flakes, Home Manager, AwesomeWM and an AI setup (Claude Code, skills and MCP servers) declared in Nix. Reinstalling the laptop is one command.
Nix flakesNixOSHome Manager
- Reinstalling the laptop is one command
- AI setup declared in Nix
- Nix
- NixOS
- Lua
- Bash
Like my NixOS dotfiles? Support its development.Buy Me a Coffee
RebootVerde
A platform that rewards people for recycling electronic waste in Lisbon: a filterable map of drop off points, recycling codes and points to trade for sustainable products. A school team project.
DjangoPostGISLeaflet
- Lisbon map filtered by parish and waste type
- Two factor authentication (TOTP)
- Python
- Django
- PostGIS
- Leaflet
- Bootstrap
- Docker
- Nix
The road so far
Python backend, automation and Linux. Two internships: one on a remote team, one in test automation.
Career
to
4 months · Lisbon
Software Engineer
Munit Marketing Digital Publicidade
PDF processing automation
Engineered a cross platform automation tool (Windows, macOS, Linux) for PDF processing workflows, compiled and distributed via GitHub Actions. Reduced processing time by about 80% at this stage of the workflow.
PHP to Python migration and webserver refactor
Migrated a webserver from PHP to Python, fully refactoring and redesigning its architecture, adding new features and deploying to cPanel. Delivered as a banner creation platform for retail businesses, integrated with a database, featuring:
- CRUD management for clients, users and banner formats
- Role based permission levels
- OTP authentication and email service integration
- Per client user limits and custom format creation with configurable limits
Both projects fully documented and version controlled by me.
- Python
- PHP
- JavaScript
- ExtendScript
- GitHub Actions
- cPanel
to
4 months · Lisbon
Test Automation Engineer
Slice, Sistemas Lógicos de Informática Cálculo e Equipamentos
- Developed a desktop application in C# using Windows Forms and DevExpress to streamline test automation.
- Automated repeated test execution, significantly improving testing efficiency.
- Implemented logging that exports results to a database.
- Slice is a Lisbon software company specialized in patient flow for hospitals and healthcare facilities.
- C#
- Windows Forms
- DevExpress
- SQL
- Git
- GitHub
Other experience
Holiday Children Supervisor
Junta de Freguesia da Estrela
Dec 2025 to Jul 2026
Holiday programmes for children aged 6 to 8, always ensuring safety and well being, helping with daily routines and creating a fun, inclusive environment.
- Summer 2026 (Jul 2026): cinema, outdoor activities, sports and dance workshops, traffic safety education, group games and team building.
- Easter 2026: egg hunts, bingo, theatre, cinema, dance, peddy paper and group games.
- Christmas: dance, cinema trips, themed bingo, theatre, cooking workshops, mystery challenges and outings to play centers.
Volunteer Assistant
Jardins Abertos
Sep 2023
Welcomed visitors at participating gardens across two weekends, invited passersby in and shared information about the festival and Lisbon's green spaces.
Community Volunteer
World Youth Day Lisbon 2023
Aug 2023
Coordinated accommodation for pilgrims, preparing sleeping areas at Escola Rainha Dona Amélia and Escola Básica Raul Lino, ensuring everyone was welcomed and well accommodated.
Skills
Languages
16- Python
- SQL
- Bash
- Nix
- JavaScript
- TypeScript
- PHP
- Lua
- C#
- C
- C++
- Objective C
- Kotlin
- ExtendScript
- HTML
- CSS
Frameworks and libraries
9- Django
- Django REST Framework
- Next.js
- Bootstrap
- .NET
- Windows Forms
- Jetpack Compose
- Tkinter
- Bun
Databases
4- PostgreSQL
- PostGIS
- MySQL
- MariaDB
Infrastructure and DevOps
9- Docker
- Podman
- Kubernetes
- Nginx
- Apache
- Azure
- GitHub Actions
- cPanel
- WSL
Tools and hardware
11- Git
- GitHub
- GitLab
- Codeberg
- GitHub Codespaces
- Android Studio
- Arduino
- ESP32
- Adobe InDesign
- Adobe Creative Cloud
- Microsoft Office
Systems and shells
6- NixOS
- Linux
- macOS
- Windows
- Zsh
- PowerShell
Education
IT Systems Management and Programming (GPSI)
Escola Profissional Bento de Jesus Caraça · to
Final grade 18/20
Professional secondary programme (EQF Level 4), Software Development Technician. 3181 hours combining general education with a technical core in software development, systems and networks.
Technical component
- Programming and Information Systems582h19
- Networks and Communications230h19
- Operating Systems144h20
- Computer Architecture144h20
- Mathematics300h18
- On the job training600h19
Class Representative for 3 consecutive years: represented the class with school staff, mediated conflicts, organized activities and facilitated communication between students and teachers.
- Git
- GitHub
- and more
The school's seals
Languages
- PortugueseNative
- EnglishEF SET 65/100C1
- SpanishC1
Certificates
Cisco · Introduction to Modern AIVerify
Introduction to Modern AI
Using AI day to day and understanding how the models work.
- AI features in free apps: photos, translation and chatbots
- In depth prompting practice with a chatbot
- Fundamentals of how the models work
- How that knowledge shapes the prompts
Anthropic · Claude Code in ActionVerify
Claude Code in Action
Running Claude Code past the quick task and trusting the result.
- Scoping and steering long sessions
- Writing instructions Claude actually follows
- Enforcing rules that cannot be skipped
- Handing work off to unattended and scheduled runs
- Verifying what ran while no one was watching
Sololearn · Introduction to HTMLVerify
Introduction to HTML
HTML basics, from structure to forms.
- Headings, text formatting, lists and tables
- Links, images, video and audio
- Attributes
- Menus and navigation
- Forms and drop down menus
- Internal, external and inline styles
- Inline and block elements
- Comments, standards and best practices
Nice to meet you, I'm Leonardo
Automation, backend and Linux, from the problem to the delivery.
I'm Leonardo, I'm 20 and I've been tinkering with computers since I was 5. These days I work mostly on backend and automation, with Linux under everything.
What I enjoy most is automating the boring stuff, tuning my system until it's exactly how I want it (my NixOS setup and dotfiles are on GitHub), hosting my own things and opening programs up to see how they work inside. In my internships I worked on a remote team and in test automation: I ask questions before writing code and speak up when I see a better option.
I want technology that serves the people who use it: open, hackable and built to last. That's what I want to bring to real projects while I grow in backend and Linux.
Leonardo ZelenskiDeveloper in Lisbon
Away from the keyboard
Camping
Camping makes you plan, improvise and fix things with what you have. It's good to unplug.
Unlocking devices
Jailbreaking and the like: if I bought it, it's mine, and I want it to last. Giving an old device a new life is one of my favourite things.
Letter of recommendation
Leonardo joined a team working remotely, a role that demands greater maturity and discipline. He attended every meeting he was called to, on time, with good conduct and clear, assertive communication.
He showed consistent commitment throughout the internship, without needing constant supervision, which reveals a level of autonomy and time management that is uncommon at this stage of training.
He showed a critical, constructive mind: he questioned approaches, proposed alternatives and did not limit himself to doing what he was asked. His attitude towards the work and towards the team was exemplary at all times.
Got a project? Let's talk.
A website for a business, a job opening or just a question: the answer comes by email.