C1 level of English
A2 level of German
DEEP LEARNING · In progress
Dog and cat classifier
A Keras notebook that tells dog and cat images apart with neural networks, with an accuracy of 0.99.
ABOUT ME
/whoami
I am Jesús León Romero Atienza, a Software Engineering student specializing in Data Engineering (Big Data) at , the University Center for Technology and Digital Art, in my hometown of Madrid, Spain.
During these three years of study, I have built a foundation in full-stack development, databases, software architecture, and systems programming.
I am fully fluent in Spanish, with a C1 level of English and an A2 level of German.
What sets me apart from the competition
What sets me apart from the competition is how I connect technology with graphic design, business analysis, and finance.
My experience in has taught me to work as part of a team, stay disciplined, and make decisions under pressure.
, , and influence my visual judgment and the way I communicate my projects.
This combination of disciplines helps me give each project a distinct identity, with several layers that reinforce one another. That lets me create solutions that work, express an identity, and connect with people. My difference from the competition lies in that mix of perspectives:
projects with more depth, more personality, and a thoughtfully designed experience.
View my projects
Featured Projects
A selection of the most relevant projects I have developed throughout my career as a technology engineer.
SYSTEMS
MegatronixOS
A C simulator of a direct-mapped cache memory: it decodes addresses, detects hits and misses, loads blocks from a simulated RAM and produces statistics.
BACKEND / OOP
Restaurant ordering platform
A team university project inspired by Uber Eats and Glovo: custom meals, several delivery methods, dynamic pricing and notifications, built with seven design patterns.
WEB / API
Fortnite daily shop
A web app that shows the Fortnite daily shop from a public API: sections, cards with prices, saved favorites and a three-hour cache.
AUTOMATION
Instagram Checker
A Python script that compares followers and following from Instagram's official export to show who does not follow you back. Everything runs locally; online verification is optional.
WEB / GAME
Aim Trainer
An aim game in the browser: 15 seconds to hit as many targets as you can, with accuracy, a local leaderboard and dark mode, using only HTML, CSS and JavaScript.
MY WORK STACK
Software
- JvJava
- PyPython
- CC
- C++C++
- JsJavaScript
- PhPHP
- TsTypeScript
Web
- AsAstro
- ReReact
- NdNode.js
- GsGSAP
Databases
- MyMySQL
- PgPostgreSQL
- MaMariaDB
- MoMongoDB
- QdQdrant
- RdRedis
- N4Neo4j
Data
- PaPandas
- NpNumPy
- MpMatplotlib
- SbSeaborn
- SkScikit-learn
- JpJupyter
Tools
- GtGit
- GhGitHub
- DkDocker
- LxLinux
- WnWindows
- n8n8n
Design
- PsPhotoshop
- GmGIMP
- PpPhotopea
- CvCanva
- AeAfter Effects
- AiIllustrator
Documentation & collaboration
- ObObsidian
- GdGoogle Drive
- WdWord
- XlExcel
- PtPowerPoint
- TmTeams
Services
I combine technical development and visual judgment so your business gets both parts right: I automate processes and build commercial websites with a polished aesthetic.
Technology process automation
Automating repetitive tasks, integrations, and internal workflows to reduce manual work.
Commercial and visual websites
Websites with a clear structure, built to present services or products with a polished aesthetic.
Technical/visual audit and guidance
A mandatory prior session to understand the real problem before proposing a technical or visual solution.
How I work
Prior guidance
What you need is assessed, technically and visually, before a single line is written.
Mandatory audit
A session with you to understand the problem, reduce errors and align expectations.
Development
The automation or the website, built on what was agreed in the audit.
Recommendations
Additional suggestions on structure, design, communication and technical feasibility.
Tools
Small personal tools that start from concrete needs: simple, accessible and transparent. The collection grows little by little.
Video converter to MP3 / MP4
Extract a video's audio as MP3 or convert it to a compatible MP4. Everything runs in your browser — nothing is uploaded to any server.
Open converter
Social media boosting tools
A collection of utilities to analyse and grow social media accounts, starting with Instagram. The logic and scripts will be connected little by little.
Coming soon
No tools match this filter.
Let's talk about your next idea
Open to collaborating, continuing to learn, and building digital products with technical and visual judgment.
Or leave me a message
Frequently Asked Questions
What people usually ask before we start.
Do you have professional experience?
Not in a professional role yet — this portfolio focuses on academic and personal projects while I finish my degree.
See my projectsWhat technologies do you use?
Mostly Python, JavaScript and TypeScript, with Astro and React for the web, and databases such as MongoDB, Redis or Neo4j. The full stack is in "My work stack".
See my stackHow do we start a project?
With prior guidance and a mandatory personal audit with you, to understand the problem properly, reduce errors and align expectations before building.
See how I workAre you available for freelance work?
I'm open to talking about projects: tell me what you need and we'll see together whether it fits my availability.
Write to meCan I see your graphic design work?
Yes — the link to the design archive is available in the About Me section.
Go to About meDoes the video converter upload my files to a server?
No. Everything is processed in your browser; neither the video nor the audio leaves your device.
See the toolsWhat's the best way to contact you?
Email is the most direct channel: use the button in the Contact section or leave me a message in the form.
Go to ContactYour question isn't here?Write to me