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Malt Strategy
Guillaume MorinGM

Guillaume Morin

Développeur Go React

€450/day
Barcelone, ES
3-7 years
React.js
Golang
Typescript
React Native
PostgreSQL

Average response time: 1 hour

About Guillaume

🔎Are you looking for a developer who can build high-performance Golang APIs and React Native mobile applications?

I’m a software engineer specialized in Golang and mobile development, with 5+ years of experience delivering production-ready systems.

I currently work on Racemappr, a sports mobile application that lists 100,000+ sporting events, featuring advanced mapping, geolocation, and mobile performance optimization.

I’ve also collaborated with Squirrel, a digital agency where I contributed to multiple projects across health, dating, e-commerce, and sports, building Golang APIs, backend architectures, and web/mobile applications.

What I can bring to your project:

• Development of high-performance backend services in Golang
• Building React Native mobile apps (iOS & Android)
• Designing scalable and maintainable architectures
• Implementing testing, CI/CD pipelines, and engineering best practices

I value clear communication and consistent progress updates throughout a project.
Sports
Digital and IT Services
E-commerce
Social Networks
IoT (Internet of Things)

  • French

    Native or bilingual

  • Spanish

    Native or bilingual

  • English

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Racemappr
    Full-Stack/Mobile Developer
    September 2024 - Today (1 year and 9 months)
    Barcelone, Spain
    📱As a Mobile & Backend Developer at Racemappr (startup/scale-up listing 100,000+ sports events), I helped build and scale the product that powers event discovery and a smooth mobile experience for athletes and organizers across iOS and Android.


    🚀What I do:

    Delivered core mobile features end-to-end in React Native, from UI/UX implementation to performance tuning and release readiness for both platforms

    Designed and implemented backend capabilities on Supabase (Postgres), including data modeling for large event catalogs and efficient querying for search/filter use cases

    Strengthened app reliability through debugging, monitoring, and iterative improvements across the stack

    Collaborated closely with product/design to ship fast, iterate on feedback, and improve user journeys

    🧑‍💻Tech stack
    React Native, TypeScript/JavaScript, Supabase (Postgres, Auth, Storage, Edge Functions), REST/HTTP APIs, Git, CI/CD, iOS & Android release
    React Native Supabase Application Mobile Google Map React.js
  • Biomass Concept
    Full-Stack Developer
    July 2023 - August 2024 (1 year and 1 month)
    Barcelone, Spain
    🔨As a Full Stack Engineer at Biomass Concept, I contributed to the design and development of an internal ERP, building a robust, scalable system to support core business operations. I worked across the stack to deliver reliable features quickly, with a strong focus on maintainability, performance, and clean architecture.

    🚀What I did

    Developed end-to-end ERP modules: from requirements to implementation, testing, and deployment

    Built and maintained backend services in Go, designing scalable APIs and core business logic

    Implemented a GraphQL layer to streamline data access, reduce over-fetching, and improve frontend velocity

    Created responsive, reusable UI components in React with TailwindCSS, ensuring consistency and usability

    Improved system reliability and scalability through refactoring, performance tuning, and collaboration with stakeholders

    🧑‍💻Tech stack
    Golang, GraphQL, React, TailwindCSS, API design, Git, CI/CD
    PostgreSQL GO Développement Back-End Développement Front-End React.js
  • Squirrel - Agence digitale
    Full-Stack developer
    July 2021 - July 2023 (2 years)
    🔨As a Remote Full Stack Engineer within a web & mobile development agency, I contributed to multiple client products, delivering both frontend and backend features with a strong focus on quality, performance, and faithful implementation of detailed designs.

    🚀What I did:

    Built React + TypeScript front-ends from precise Figma specs (pixel-perfect UI, reusable components, responsive layouts)

    Designed and developed complete admin back-offices: content management, workflows, roles/permissions, and dashboards

    Developed backend services in Golang using GraphQL and/or REST APIs, implementing business logic, secure endpoints, and integrations

    Modeled and optimized PostgreSQL databases (schemas, queries, performance improvements)

    Delivered across diverse domains: dating apps, healthcare (Google Maps integration, geolocation, advanced search & filters), and sports products

    🧑‍💻Tech stack
    React, TypeScript, Figma, Golang, GraphQL, REST APIs, PostgreSQL, Git, CI/CD
    GraphQL Backend Service Development Développement Front-End React.js GO

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Education

  • Expert en technologie de l'information
    Epitech Technology
    2023
    In essence, the initial two years of Epitech’s Grande École Program are dedicated to acquiring proficiency in fundamental programming languages, with a special focus on C and C++. This forms an essential groundwork, imperative for those envisioning a future in IT expertise, whether it be in software engineering, artificial intelligence, or cybersecurity.

Certifications

Skill set

JavaScript
HTML5
CSS3
API REST
TailwindCSS
GraphQL
GO
Application Mobile
Front End Interface Development
Backend Service Development
External API integration
Supabase
Développement web
Application web

Categories