You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Malt Strategy
New report
Malt Tech Trends 2026
Jimmy CrequerJC

Jimmy Crequer

Full-Stack Engineer & Software Architect (Typescript, Node.js, React, GraphQL, PostgreSQL, Cloud, AI)

€600/day
Nantes, FR
8-15 years
TypeScript
React.js
PostgreSQL
AI Automation
GraphQL

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Jimmy

I am a full-stack engineer with over 12 years of experience in designing and developing web applications, backend systems, and SaaS products.

I help companies create robust and scalable software, from the design phase to production. My work covers backend architecture, full-stack development, APIs, data pipelines, and AI-based features.

Throughout my career, I have worked in various environments, from startups to larger organizations, including Rakuten, where I contributed to backend systems and data platforms in a complex, multi-team technical context.

I particularly enjoy projects that require both technical rigor and genuine product thinking, whether for internal tools, business applications, or SaaS platforms.

My technical expertise primarily includes TypeScript, Node.js, React, GraphQL, PostgreSQL, cloud, and AI/LLM integrations.

I favor a pragmatic approach, clear communication, and the delivery of reliable and maintainable solutions.
Software Publishing
Medical Devices
Consulting and Audits

  • French

    Native or bilingual

  • English

    Fluent

  • Japanese

    Fluent

Remote only
Primarily works remotely

Experience

  • Y A O Y A株式会社
    Lead Developer
    TELECOMMUNICATIONS
    January 2021 - Today (5 years and 5 months)
    Osaka, Japan
    Lead engineer responsible for the design and development of full-stack applications across multiple product lines, ranging from mobile applications to internal business systems and SaaS platforms.

    Responsibilities
    • Led the architecture and development of several production systems, including mobile applications, CRMs, and data-oriented platforms
    • Collaborated closely with product teams and business stakeholders to define requirements and translate them into scalable technical solutions
    • Designed backend architectures with Node.js, TypeScript, and GraphQL, with a focus on maintainability and performance
    • Set up and maintained cloud infrastructures and deployment pipelines
    • Integrated AI and LLM-based features into existing and new products
    • Participated in cross-functional technical decisions, balancing delivery speed with long-term scalability
    TypeScript GraphQL AI Automation IT Architecture PostgreSQL
  • Rakuten
    Application Engineer — Scrum Master & Backend Technical Lead
    CULTURE
    March 2018 - December 2020 (2 years and 9 months)
    Osaka, Japan
    Scrum Master and technical lead within an international team of 5-6 engineers, responsible for the delivery and coordination of backend systems supporting Rakuten Books, a platform used by publishers for operational management and data analysis.

    Responsible for key components of the Rakuten Books Dashboard backend, focusing on reliability, scalability, and continuous improvement of production systems.

    Responsibilities
    • Led end-to-end delivery within an international team, ensuring a stable development pace and alignment with product priorities
    • Contributed to the architecture and development of Rakuten Books Dashboard backend systems, focusing on performance, reliability, and scalability
    • Designed and maintained data pipelines integrating data flows from multiple internal Rakuten services, enabling consistent and reliable large-scale data utilization
    • Collaborated closely with product owners and business stakeholders to translate complex requirements into clear, implementable technical solutions
    • Coordinated dependencies and deliveries between multiple Rakuten divisions, facilitating integration and synchronization between teams
    • Acted as a technical facilitator between engineering, product, and other departments in a complex organizational environment
    • Participated in and won two internal Rakuten hackathons, with prototypes that had a concrete impact or were reused in product contexts
    Java Elasticsearch Docker Vue.js Spring boot
  • Kobe Digital Labo KK
    Software Engineer
    TELECOMMUNICATIONS
    October 2013 - February 2018 (4 years and 4 months)
    Kobe-shi, Hyogo Prefecture, Japan
    Developer within the advanced technology development division

    Responsibilities
    • Developed a big data analysis application in collaboration with Kyoto University (Relatedness Technology)
    • Developed a crowd evacuation simulation application
    • Served as lead developer on several small-scale projects
    Java TypeScript MongoDB Jenkins React.js

Recommendations

Be the first to recommend Jimmy

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Signup to reveal

Education

  • Japanese Language Proficiency Test N1 Applied Graph Algorithms Neo4j Certified Professional
    Japanese Language Proficiency Test N1 Applied Graph Algorithms Neo4j Certified Professional
  • Licentiate degree
    University of Nantes
    2010
    Licentiate degree

Categories