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

Profile · About

ABOUT ME.

Software developer across data, web and systems. I care that the work can be understood and maintained.

I move between disciplines when the problem needs it. The stack is a means, not an identity.

I am a software developer and I enjoy moving between disciplines when the problem calls for it. I have worked with data, web product, backend, infrastructure and internal tools.

I have worked at LeanMind since 2020, learning in very different contexts: data processing at Clarity.ai, a confidential technology platform, billing modernisation at Voxel, internal initiatives and, currently, full-stack development for Next Digital.

I care about turning complex systems into software a team can understand, maintain and improve. Outside code, I write, share what I learn and take part in conversations about building better.

Read the full CV

JAPONESAPP AND REAL THINGS.

One case with a real recording, decisions and limits. No invented cases.

View all projects ↗ 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, 20235 minBigData · 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. 6 months

    LeanMind · Next Digital

    Full Stack Developer

    C# · .NET · PostgreSQL · JavaScript · MQTT

  2. 3 months

    LeanMind

    Internal Management

    Leading internal initiatives, mentoring team members, and contributing to company growth strategies. Strongly focused on the use of AI tools and on sharing knowledge, improving processes, and fostering a collaborative engineering culture.

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

  3. 1 year 1 month

    LeanMind · Voxel

    Backend Developer

    I participated in the development of a greenfield project for invoice management between hotels and travel agencies. I implemented improvements in different processes for various internal-use projects and, above all, helped with the renewal of a large legacy codebase.

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

  4. 5 months

    LeanMind · Secret Project

    Full Stack Developer

    I collaborated on software projects focused on mathematical research. I contributed to a cutting-edge technology initiative, focusing on clean architecture and maintainable code practices.

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

  5. 2 years 3 months

    LeanMind · ClarityAI

    Data Engineer

    I developed and maintained ETL data processing pipelines for data analysis. I worked with large-scale data systems, implemented automated testing strategies, and contributed to platform scalability improvements.

    Python · Pandas · Pytest · AWS · Docker · MongoDB

  6. 1 year

    LeanMind

    Internship

    I started my professional career as an intern, learning software development best practices, reading books, learning TDD methodology and agile principles. I contributed to internal projects while developing fundamental skills in modern web development.

    TypeScript · JavaScript · React · Docker · MySQL · Git

Capabilities

FIVE AREAS, ONE CRAFT.

Not a wall of logos: where I have worked and what I can do with it.

  1. 01

    Web product

    React · Next.js · Astro · TypeScript · JavaScript · CSS

  2. 02

    Backend & systems

    C# · .NET · Node.js · PostgreSQL · MQTT

  3. 03

    Data & automation

    Python · Pandas · Pytest · ETL · AWS

  4. 04

    Delivery & platform

    Docker · Kubernetes · ArgoCD · Jenkins · GitHub Actions

  5. 05

    Practices

    TDD · Testing · Pairing · Clean Architecture · Mentoring

View the full CV

Recommendation

WHAT PEOPLE SAY.

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

Michael Reyes ↗

Lead Frontend Specialist & Consultant · Lean Mind

We worked together at LeanMind.

Originally in Spanish · translated

“His experience with code gives you tremendous confidence and peace of mind day to day, and he integrates perfectly into the team.”

Recommendation

Michael Reyes

Lead Frontend Specialist & Consultant · Lean Mind

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.

We worked together at LeanMind.

In the open

ON GITHUB.

Public contributions, not hours worked or productivity.

Contributions
1,420
Active days
135
Current streak
2 days
Daily average
4.5

By month

Data through Nov 12, 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

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