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ESTEBANPLAYER 01

Player profile 01 · Mobile engineering

Open to new opportunities

Esteban Marigonez

Lead React Native · Mobile Engineer · Full-stack Engineer

I build robust mobile applications, set a clear technical direction for teams and keep a practical view of the entire web stack.

Caen + surrounding areaHybridFully remote

Scroll to start the journey

LEVEL 01 / SKILLS

What I bring.

Mobile engineering is my primary field. Web engineering, code quality and knowledge sharing complete the system.

MOB01

Mobile & React Native

I design, take over and ship iOS and Android applications, from architecture to store release.

Field evidence

Over five years of experience, including high-stakes user journeys for the impots.gouv application.

  • React Native
  • Expo
  • TypeScript
  • Firebase
  • iOS
  • Android
LEAD02

Technical direction & mentoring

I frame decisions, contribute code, review work and help developers develop their skills.

Field evidence

Technical lead, CTO and React Native trainer.

  • Architecture
  • Code review
  • Mentoring
  • Training
  • CI/CD
WEB03

Full-stack web

I switch between front-end and back-end work to solve business problems.

Field evidence

Contributions to DGFiP’s internal agent portal and to connected web platforms.

  • React
  • Vue.js
  • Node.js
  • Java
  • Spring Boot
  • GraphQL
QLT04

Production quality

Accessibility, security, testing and delivery are part of development from the start.

Field evidence

RGAA accessibility improvements, mobile releases and projects delivered in demanding environments.

  • RGAA
  • Testing
  • Docker
  • GitLab
  • Jenkins
  • Apple Store Connect
  • Google Play Console

STAKEHOLDERS

Teams have trusted me to build, take over and evolve their products.

LEVEL 02 / FEATURED MISSIONS

Three fields. The same drive to progress.

Public service, mobile product and virtual reality: three settings that show how I build, lead and learn.

MISSION 01 / PUBLIC SERVICE

Since November 2023

French Public Finances Directorate

Evolving an application used nationwide.

Contributing to high-stakes mobile journeys while growing the team’s React Native expertise.

My role

React Native and full-stack web developer, technical lead for three developers within two mobile teams.

Actions

  • Tax filing journeys and QR-code payment.
  • RGAA-compliant improvements and contributions to the internal portal used by DGFiP agents.
  • React Native / Expo / Firebase multiplayer quiz and internal training.

What it demonstrates

I combine delivery, accessibility and knowledge sharing in a demanding public-sector environment.

Loadout

  • React Native
  • Expo
  • Android Studio
  • Xcode
  • TypeScript
  • Firebase
  • Vue.js
  • Java
  • Spring Boot

MISSION 02 / MOBILE PRODUCT

2021, then 2022

SpinforEat

Leading the product without leaving the code.

Giving a mobile product and the team building it a clear technical direction.

My role

CTO and React Native developer across two engagements, leading a team of four developers.

Actions

  • Mobile architecture, technical decisions and code reviews.
  • Hands-on React Native / Expo product development.
  • Apple Maps on iOS and Google Maps on Android through GCP.

What it demonstrates

Hands-on leadership: frame, decide, review and build alongside the team.

Loadout

  • React Native
  • Expo
  • Apple Maps
  • Google Maps
  • GCP
  • Code review

MISSION 03 / ADAPTATION

MSc Networks & Security · 2019–2020

CyberQuiz VR

Learning Unity and C# to build in VR from scratch.

Turning a cybersecurity topic into an interactive learning experience in a new technical environment.

My role

Designed and developed a cybersecurity awareness educational game from scratch.

Actions

  • Learned Unity and C# at the start of the project.
  • Designed a virtual-reality experience.
  • Completed the project as part of the MSc validation.

What it demonstrates

My ability to learn quickly, structure an unfamiliar topic and deliver a complete experience.

Loadout

  • Unity
  • C#
  • VR
  • HTC Vive Pro
  • Cybersecurity

LEVEL 03 / MISSION LOG

The rest of the journey, without the long scroll.

Project takeovers, training, full-stack web and automation. Open the log for details.

Show additional experience08
01

Feb. 2023

B-Flow

React Native Developer

Took over a struggling application: fixes, new features and visual redesign.

  • React Native
02

Mar. — Jun. 2022

Business At Work

RPA Developer

Automated internal processes for a key client.

  • UiPath
  • VBA
  • RPA
03

Dec. 2021 — Jan. 2022

Adonya

React Native Trainer

Designed course material and exercises, then delivered remote training.

  • React Native
  • Training
04

Dec. 2021

Basile

React Native Developer

SSO, push notifications, builds and iOS / Android testing.

  • React Native
  • SSO
  • Push notifications
  • iOS
  • Android
05

Mar. — Aug. 2021

Biche Production

Lead React Native Developer

Technical choices and architecture for a mobile, web and API product.

  • React Native
  • API Platform
  • React
  • Symfony
  • GraphQL
  • Docker
06

Sep. 2020 — Feb. 2021

Axeos International

Full-stack Web Developer

Built a booking platform in a pair, connected to a room-management solution.

  • API Platform
  • React
  • Symfony
  • GraphQL
  • Docker
07

Oct. 2018 — Jul. 2019

Capgemini / ANTAI

RPA & VBA Developer

Automation, project indicators and a monthly dashboard.

  • UiPath
  • VBA
  • RPA
08

Jul. — Dec. 2017

Groupe Nass

VBA Developer & Trainer

Development and knowledge sharing around VBA.

  • VBA
  • Training

LEVEL 04 / PROFILE

Progress is not a sprint.

In technology, video games and calisthenics, I follow the same loop: understand a system, practise and improve over time.

ADAPT

Active curiosity

Learn

From Unity and C# to VR, I can enter an unfamiliar environment and build while learning.

  • Research
  • AI
  • Codex
  • Claude Code
SHARE

Knowledge circulates

Share

React Native training, team support and volunteering: explaining is part of the job.

  • Mentoring
  • Training
  • Epitech
  • ZUPdeCO
ENDURE

10+ years of practice

Stay the course

Weight training and then calisthenics taught me consistency, body awareness and progress without shortcuts.

  • Calisthenics
  • Consistency
  • Control
  • Progress
PLAY

Since the Nintendo 64

Keep playing

From consoles to PC, games feed my interest in systems, feedback and well-tuned experiences.

  • Console
  • PC
  • Cooperation
  • Strategy

Education

2016 — 2021

Epitech Rennes

Expert in Information Technology, Master’s-level qualification

2019 — 2020

University of Kent

MSc Networks & Security · Canterbury

Languages

  • French · native
  • English · fluent
  • Spanish · basic

FINAL LEVEL / CONTACT

A team, a product, a new challenge?

Let’s continue on LinkedIn.

I’m looking for a team where I can build useful products, move the technology forward and keep progressing.

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