Resume

Benoit Guina

Senior Software Engineer

Senior Android and backend engineer over more than 12 years, with extensive experience across more than 5 international applications and complex payment & data systems. Specialized in designing scalable, maintainable solutions using Clean Architecture, SOLID principles, and pragmatic TDD/BDD practices, with a strong focus on automating repetitive tasks through scripts, tests, and AI to significantly improve development efficiency and consistency.

Skills

Core

Web

CI/CD

Experience

Freelance KMP Developer

Feb 2025 - Present

WayKonect (TotalEnergies) - Mobility and EV charging solutions

Designed and implemented a payment flow for Android + WASM, including migration of over 50 dependency modules to Kotlin Multiplatform (KMP), deployed on 6,752 EVSEs handling more than 28,000 charges per month in France
Implemented a state machine for remote EV charging to guarantee consistency and high reliability
Automated architecture validation, code linting, and test execution across all pull requests
Led the transition from imperative code to a robust event-driven architecture
Developed a Ktor mock server to enable reliable E2E testing and mitigate nightly service unavailability

Freelance Ktor Server Developer

Dec 2023 - Feb 2024

ID4IT - Startup in building management systems

Continued development of the REST API and achieved 100% test coverage on all endpoints
Implemented API versioning and performed regular database migrations to support evolving data models
Developed real-time MQTT data processing features, unlocking new B2B opportunities
Added front-end specific endpoints reducing its loading times by up to 12x
Implemented OpenID Connect (OIDC) and IAM using a multi-tenant Keycloak version
Added role-based security controls to secure endpoint access
Provided comprehensive documentation of the API, services, and domain knowledge using OpenAPI and Confluence

Freelance Android Developer

Aug 2021 - Oct 2022

Louis Vuitton - Connected devices companion application

Developed numerous Bluetooth Low Energy features for the Tambour Horizon v2 smartwatch and Horizon Light Up earbuds
Integrated health data synchronization with GMS and HMS
Managed Google and Huawei developer consoles for application releases and updates
Conducted code reviews and pair-programming sessions on critical features
Contributed to the documentation of architecture, features, and technical constraints

Freelance Android Developer

Oct 2019 - Jul 2021

Decathlon - Retail solutions

Fully modernized the Test&Buy application in CLEAN architecture with a new UX, achieving over 99.5% crash-free rate
Integrated the service into the main retail application and adapted API calls to its BFF
Integrated a new API version to expand operations from France to more than 20 countries
Developed Decathlon’s first bike leasing service, launched in 6 pilot stores
Onboarded and mentored new developers through pair-programming and project documentation

Consultant Android Developer

Dec 2017 - Sep 2019

Decathlon & Domyos - Retail solutions

Developed a kiosk application to showcase a new bike range and enable test session requests
Built a companion application for store staff to manage test session bookings on Firebase
Configured a Kibana dashboard for intuitive analytics visualization and reporting
Evolved the kiosk application to support any product category through configuration
Created a configuration tool for staff to manage showcased products
Deployed and maintained the applications used across 600+ stores in Europe

Consultant Android Developer

Jan 2017 - Oct 2017

Decathlon - Shopping application

Contributed to the news feed, Q&A section, and regional features
Strengthened the MVVM architecture by enforcing clear separation of concerns
Performed bug fixes and general application maintenance

Junior Mobile Developer

Jan 2015 - Oct 2016

Equisense - Startup in equine health solutions

Developed an Android application to test and demonstrate the Bluetooth sensor
Created Firebase Cloud Functions to process and serve sensor data
Built an Ionic Progressive Web App to guide and recommend equine exercises

Freelance Software Developer

Jun 2012 - Jul 2013

9h37 - Startup in medical teleconsultation solutions

Developed a JavaScript library and Django server to interface with Sécurité Sociale C libraries via web services
Built a Qt application for networked USB transmission to remotely read professional and health insurance cards
Authored installer scripts to generate distribution packages for Windows and Unix-based systems

Education

EPITECH

2010 - 2014

Advanced programming topics including design patterns, algorithms, multithreading, and networking
Multiple project-based studies in over 6 programming languages