Airán Sánchez.
ES EN JA

Airán Sánchez.

Software developer // Data · Web · Systems

LeanMind · Next DigitalCanary Islands ↔ Spain ↔ JapanSince 2020

0years building
Airán Sánchez
Airán Sánchez · 2026

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I BUILD SYSTEMS THE TEAM CAN UNDERSTAND.

Data, web and systems. I understand the problem, connect the pieces and build with the team. I care that the system can be maintained and explained.

UnderstandOperateEvolve

JAPONESAPP AND REAL THINGS.

One case with a real recording, decisions and limits. No invented cases.Swipe to see all four cards →

Mobile prototype

JaponesApp

An app to study kanji and vocabulary, practise and see progress. A real simulator recording, no audio.

Open case
Real JaponesApp screen with the three study modes

The idea

Study with local data.

SQLite keeps cards and progress on the device. Studying needs no account and no server of its own.

Real Kanji N5 screen with the kanji grid

The work

Review with criteria.

A native C++ engine uses FSRS-5 to schedule spaced repetition. The interface is built with React Native and TypeScript.

Real Kanji N5 screen with the learning state

The limits

A prototype, not a promise.

The recording shows navigation and progress; it does not validate the whole app. There is no public download and no user metrics.

I WRITE ABOUT THE CRAFT. SOFTWARE, TESTING, TEAMS.

A working notebook, not an announcement blog. No shortcuts.

Jan 20, 2023BigData · Learning · LeanMind

How We Reduced an 11-Hour Process to 37 Minutes

optimization of a process in data engineering

UNHURRIED CONVERSATIONS.

Technology, work and the stories that appear between them. No script and no rush.

FROM DATA TO PRODUCT.

At LeanMind since 2020. Data, backend, web product and internal management. What connects those projects is the way of working.

  1. Full Stack Developer

    LeanMind · Next Digital

    6 months

    C# · .NET · PostgreSQL · JavaScript · MQTT

  2. Internal Management

    LeanMind

    3 months

    Astro · TypeScript · Node.js · React · Docker · Figma

  3. Backend Developer

    LeanMind · Voxel

    1 year 1 month

    .NET · PostgreSQL · JavaScript · Git · Docker · Bash

  4. Full Stack Developer

    LeanMind · Secret Project

    5 months

    TypeScript · Node.js · MongoDB · Kubernetes · AWS · React

  5. Data Engineer

    LeanMind · ClarityAI

    2 years 3 months

    Python · Pandas · Pytest · AWS · Docker · MongoDB

  6. Internship

    LeanMind

    1 year

    TypeScript · JavaScript · React · Docker · MySQL · Git

View the full CV

Recommendation

WHAT PEOPLE SAY.

A real voice from someone I have shared a team and a project with.

“His experience with code gives you tremendous confidence and peace of mind day to day, and he integrates perfectly into the team.”
Michael ReyesLead Frontend Specialist & Consultant · Lean Mind
Read the full recommendation
“On the different occasions when I have had the opportunity to work with Airán, it has been a real privilege, as he is a great professional and teammate. He has demonstrated extensive knowledge of both back-end and front-end development, implementing intelligent solutions using methodologies such as TDD or XP. His experience with code gives you tremendous confidence and peace of mind day to day, and he integrates perfectly into the team. I would genuinely love to work with Airán again on another project and continue learning from all the knowledge I know he has to offer.”

In the open

ON GITHUB.

Public contributions, not hours worked or productivity.

Contributions
1,414
Active days
134
Longest streak
5 days
Daily average
4.5
Data through Nov 11, 2026. View profile ↗

SHALL WE TALK?

A project, an opportunity to work together or something you want to share. Write to me and I will reply personally.

Direct email. No forms that get lost.

Emailairanschez0@gmail.com

GitHubAiranSchez ↗

LinkedInAirán Sánchez ↗

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Personal reply.
Airán Sánchez.
ES EN JA
Canary Islands ↔ Spain ↔ Japan Portfolio · 2026