Rémy is available for hire
Hire RémyRémy Sabliet
Verified Expert in Engineering
Full-stack Developer
Tokyo, Japan
Toptal member since December 29, 2023
Bio
Rémy is a senior full-stack developer with 15 years of expertise in the IT industry. He specializes in JavaScript frameworks, notably React, Next.js, and Express.js. His portfolio showcases successful collaborations with prestigious clients such as Fast Retailing and renowned French banks, including BNP Paribas, Societe Generale, and Groupe Credit Agricole.
Portfolio
Freelance
JavaScript, TypeScript, Amazon Web Services (AWS), Amazon S3 (AWS S3)...
Frontify
TypeScript, PHP, React, GraphQL, GraphQL API, Node.js, Amazon EC2...
Japan Post Digital
Next.js, React, Sass, AWS Amplify, Amazon S3 (AWS S3), Node.js...
Experience
- React - 6 years
- Node.js - 5 years
- SQL - 5 years
- TypeScript - 5 years
- Next.js - 4 years
- Express.js - 4 years
- Amazon EKS - 3 years
- WebSockets - 3 years
Work Experience
Senior Full-stack Engineer
2025 - PRESENT
Freelance
- Developed an AI-driven simulation platform to evaluate the ROI and feasibility of green energy projects.
- Rewrote the legacy front end from scratch, applying DRY and SOLID principles while introducing a new design system to significantly improve UI/UX.
- Developed multiple FastAPI endpoints to support front-end features, including energy simulation configuration and visualization.
- Established a robust testing strategy with Vitest and Playwright, automating critical user journeys (login, project creation, simulation runs).
Technologies: JavaScript, TypeScript, Amazon Web Services (AWS), Amazon S3 (AWS S3), Amazon EC2, Python, FastAPI, SCSS, PostgreSQL, React
Senior Full-stack Engineer
2025 - 2025
Frontify
- Implemented new back-end features using Node.js (GraphQL API) and maintained/extended an existing PHP legacy system.
- Implemented high-performance file upload functionality by splitting files into multiple blocks for parallel processing, significantly improving upload speed.
- Developed new pages to manage client-facing API endpoint settings for media optimization.
Technologies: TypeScript, PHP, React, GraphQL, GraphQL API, Node.js, Amazon EC2, Full-stack Development, Cursor AI, JavaScript, Back-end, Microservices, MySQL, Python, SCSS
Senior Full-stack Engineer
2025 - 2025
Japan Post Digital
- Developed features to allow companies to register systems and manage API keys, enabling seamless integration of Japan Post Digital APIs into their platforms.
- Delivered a business application (事業者サイト) using Next.js v15 and CSS modules within a tight 1.5-month deadline.
- Built a custom design system from scratch, developing reusable core UI components without external UI libraries.
- Integrated OIDC authentication using NextAuth.js, connecting with ゆう ID IDP for secure login and access management.
Technologies: Next.js, React, Sass, AWS Amplify, Amazon S3 (AWS S3), Node.js, OpenID Connect (OIDC), Full-stack Development, Cursor AI, JavaScript, Back-end, MySQL, SCSS
Senior Full-stack Engineer
2024 - 2024
Sagri
- Implemented geometry drawing on maps to represent farmlands, as well as a navigation feature using the Mapbox SDK.
- Developed client components on the front end using Next.js and React following atomic design principles.
- Implemented RESTful APIs and Server Actions on the back end, handling database interactions with Knex.
- Performed configuration changes and investigations for AWS services, including S3, RDS, EC2, and ECS.
- Implemented unit and integration testing using Vitest, comprehensively testing both back-end and front-end functionalities.
- Integrated New Relic with an AWS account and configured New Relic dashboards and alerts for monitoring.
Technologies: Next.js, React, Amazon Elastic Container Service (ECS), Amazon S3 (AWS S3), Amazon EC2, New Relic, API Integration, MacOS, Slack, Axios, Geospatial Data, GeoJSON, Full-stack Development, Cursor AI, JavaScript, Back-end, Elasticsearch, MySQL, Recoil, AWS IoT, SCSS
Senior Full-stack Engineer
2020 - 2023
Asurion
- Led a team of three developers, overseeing daily Scrum calls, task assignments, training sessions, and PR reviews.
- Initiated, estimated, and executed a UI migration project from AngularJS to React for an application aimed at remote device control in iOS and Android.
- Developed a design system library using React components and TypeScript, incorporating Storybook for demonstration and showcasing purposes.
- Addressed and resolved all critical incidents within the application while proactively mitigating 95% of its vulnerabilities, including those identified through Snyk, penetration testing, and npm.
- Implemented Amazon Cognito authentication on both back-end and front-end sides, including the necessary configurations within the AWS console.
- Designed user management pages integrated seamlessly with the Amazon Cognito user pool for efficient user administration.
- Introduced multiple WebSockets and RESTful APIs across both front-end and back-end systems. Also implemented various single-page application features using React, TypeScript, and Angular 2 across numerous projects.
Technologies: TypeScript, React, Node.js, Amazon EKS, Amazon Cognito, Amazon Route 53, WebSockets, Express.js, Next.js, Sass, CSS, Redux, Redux-Saga, NGINX, Amazon S3 (AWS S3), Scrum, React Components, Storybook, Jest, Amazon Web Services (AWS), Tailwind CSS, HTML, Full-stack, REST APIs, API Development, Authentication, API Integration, MacOS, Slack, Axios, GraphQL, GraphQL API, Full-stack Development, JavaScript, Back-end, Microservices, MySQL, AWS IoT, SCSS
Front-end Engineer
2019 - 2020
Joyz
- Implemented WebView for English language learning using Vue and TypeScript.
- Set up voice recognition using both media devices and Microsoft's speech recognition service for evaluations.
- Implemented AWS Lambda to execute a C++ binary file for evaluating user speech data has been completed.
- Resolved vulnerabilities across all our npm package libraries.
Technologies: TypeScript, Vue, Storybook, Sass, AWS Lambda, WebView, HTML, API Integration, MacOS, Slack, Axios, JavaScript, SCSS
Full-stack Engineer
2018 - 2019
Fast Retailing
- Developed responsive and interactive web pages utilizing HTML5, Sass, React, and prominent libraries such as Redux, Webpack, and Formik.
- Implemented TypeScript into the existing codebase to enhance maintainability and reduce potential bugs during compilation.
- Built REST APIs using Node.js, Express.js, and Java with Spring Boot, incorporating services that interact with PostgreSQL databases.
- Leveraged Docker for standardized application deployment, enhancing security through isolated environments.
Technologies: React, Redux, TypeScript, Sass, Express.js, NGINX, HTML5, Webpack, Formik, REST APIs, Node.js, Spring Boot, Docker, Japanese, Material UI, Jest, PostgreSQL, HTML, Full-stack, API Development, Next.js, API Integration, MacOS, Slack, Axios, Full-stack Development, JavaScript, Back-end, SCSS
Java and WTX Developer | Junior Project Manager
2014 - 2017
BNP Paribas
- Developed a money transfer application for BNP Paribas that enables SWIFT payments with an average daily transfer volume of €50 million.
- Contributed to an Indian offshore project, including 50 developers in Mumbai and 8 developers in Paris.
- Designed and developed screens using HTML, CSS, and JavaScript.
- Implemented RPC and DAO methods using JEE and Spring alongside Oracle PL/SQL to bring user interfaces to life.
- Created and implemented cross-technology solutions leveraging Websphere Transformation Extender (IBM).
- Conducted a comprehensive benchmark of the newly built application, resulting in a detailed report delivered to the senior management team.
- Managed a sub-project aiming to implement monitoring tools to ensure reliable production support. The sub-project tasks included solution exploration, work structure definition, technical specificities, coordination, and project follow-up.
Technologies: WebSphere Transformation Extender, Java 8, JSS, Oracle9i, IT Project Management, Oracle PL/SQL, SQL, WTX, Java, Ext JS, HTML, Full-stack, API Integration, Full-stack Development, Technical Writing, JavaScript, Back-end
VIE (USA) IT Analyst
2013 - 2014
BNP Paribas
- Managed, integrated, and supported IT projects within the US-listed derivatives hub.
- Led project implementation, including technical specification writing, development, and validation through the UAT phase.
- Wrote PL/SQL procedures and developed WTX flows for reporting purposes.
Technologies: SQL, WebSphere Transformation Extender, PL/SQL, Oracle9i, WTX
BI Consultant
2011 - 2012
Societe Generale
- Conducted 3rd-party maintenance for the transversal risk service information system.
- Managed Microsoft SQL Server's database and developed PL/SQL procedures and SQL Server Integration Services (SSIS) flows.
- Built and extracted on-demand business data utilizing SQL and PL/SQL queries.
Technologies: Microsoft SQL Server, SQL, SQL Server Integration Services (SSIS), PL/SQL, Technical Writing
BI Designer and Programmer
2009 - 2011
Groupe Credit Agricole
- Developed SQL Server Integration Services (SSIS) flows and PL/SQL stored procedure flows as integral parts of a migration project to transition the billing system from SAS technology to Microsoft SQL Server.
- Designed and developed a strategic dashboard for customer quality utilizing SQL Server Reporting Services (SSRS).
- Conducted an audit across multiple departments within the company to identify and compile potential enhancements to improve our services.
Technologies: Microsoft SQL Server, SQL Server Reporting Services (SSRS), SSIS Custom Components, SQL, PL/SQL, SQL Server Integration Services (SSIS), Technical Writing
Project History
Rémy SABLIET Professional Homepage
This project showcases Rémy SABLIET's professional homepage, which I developed as a freelance web designer.
I utilized various animation techniques, including pure Vanilla JS, CSS3, SVG, and GSAP.
I meticulously crafted Japanese and English characters using Adobe Illustrator and seamlessly integrated them on-screen, employing CSS techniques. I also designed a custom sliding effect using Vanilla JS, which I implemented through higher-order components (HOCs).
The web design is responsive and caters to various devices, including phones, tablets, and desktops.
I utilized various animation techniques, including pure Vanilla JS, CSS3, SVG, and GSAP.
I meticulously crafted Japanese and English characters using Adobe Illustrator and seamlessly integrated them on-screen, employing CSS techniques. I also designed a custom sliding effect using Vanilla JS, which I implemented through higher-order components (HOCs).
The web design is responsive and caters to various devices, including phones, tablets, and desktops.
NexControl: A Solution to Remotely Control Mobile Devices
NexControl, tailored for mobile phone insurance agents, streamlines device management for Android and iOS. Agents can remotely test, diagnose, and support devices, eliminating the need for physical access.
Before NexControl, agents had to be physically present in their office, causing inefficiencies. The pandemic highlighted the need for remote capabilities, making NexControl invaluable.
The architecture comprises the provider, the back end, and the front end. Using an Apple Mac mini, the provider securely connects the back end and devices. Device interactions use tools like ADB, IDB, and Xcode for iOS.
The back end, hosted on AWS, leverages EKS, RDS, Route 53, S3, Cognito, and Lambda. It follows a service-oriented architecture (SOA) with JavaScript components in containers communicating via websockets or RESTful APIs managed by Kubernetes.
The front end offers an intuitive interface, ensuring a responsive environment for device interaction. Real-time control is achieved through websockets.
As the project leader, I oversaw the implementation, ensuring team collaboration and a user-friendly mobile device management solution for insurance agents.
Before NexControl, agents had to be physically present in their office, causing inefficiencies. The pandemic highlighted the need for remote capabilities, making NexControl invaluable.
The architecture comprises the provider, the back end, and the front end. Using an Apple Mac mini, the provider securely connects the back end and devices. Device interactions use tools like ADB, IDB, and Xcode for iOS.
The back end, hosted on AWS, leverages EKS, RDS, Route 53, S3, Cognito, and Lambda. It follows a service-oriented architecture (SOA) with JavaScript components in containers communicating via websockets or RESTful APIs managed by Kubernetes.
The front end offers an intuitive interface, ensuring a responsive environment for device interaction. Real-time control is achieved through websockets.
As the project leader, I oversaw the implementation, ensuring team collaboration and a user-friendly mobile device management solution for insurance agents.
MTM: A Money Transfer Management System
MTM stands for Money Transfer Management, a system designed to facilitate seamless SWIFT transfers among BNP Paribas branches, averaging a daily transaction volume of €50 million.
This offshore project is executed by a team comprising 50 developers in India and 8 in Paris.
As a Java and WTX developer, as well as a junior project manager, I made significant contributions to various aspects of the project, including:
• Developing WTX programs to enable SWIFT payment transfers within the application and the BNP Paribas network.
• Creating Oracle PL/SQL procedures and JEE jars to extract data from the Oracle database and provide it to RPC endpoints. I also participated in JavaScript and page development using the Ext JS framework.
• Initiating and leading a project focused on monitoring the main application through a set of monitoring tools.
• Conducting a comprehensive benchmark of the MTM application, resulting in a detailed report delivered to the senior management team.
This offshore project is executed by a team comprising 50 developers in India and 8 in Paris.
As a Java and WTX developer, as well as a junior project manager, I made significant contributions to various aspects of the project, including:
• Developing WTX programs to enable SWIFT payment transfers within the application and the BNP Paribas network.
• Creating Oracle PL/SQL procedures and JEE jars to extract data from the Oracle database and provide it to RPC endpoints. I also participated in JavaScript and page development using the Ext JS framework.
• Initiating and leading a project focused on monitoring the main application through a set of monitoring tools.
• Conducting a comprehensive benchmark of the MTM application, resulting in a detailed report delivered to the senior management team.
Education
2017 - 2018
Japanese Language Proficiency (Business Level) in Japanese
Shinjuku Japanese Language Institute - Tokyo, Japan
2009 - 2011
Master's Degree in Computer Science
Université d'Évry - Evry, France
2007 - 2009
Diplôme Universitaire De Technologie (DUT) in Computer Science
IUT Sénart-Fontainebleau - Fontainebleau, France
Certifications
NOVEMBER 2020 - NOVEMBER 2023
AWS Certified Developer - Associate
Amazon Web Services (AWS)
AUGUST 2018 - PRESENT
JLPT N2 (Japanese-Language Proficiency Test)
The Japan Foundation and Japan Educational Exchanges and Services
JUNE 2016 - PRESENT
Oracle Certified Associate, Java SE 8 Programmer
Oracle
Skills
Libraries/APIs
React, REST APIs, Node.js, API Development, Vue, Redux-Saga, GSAP, Formik, AWS Amplify, GraphQL API
Tools
Amazon EKS, Amazon Cognito, Slack, WebSphere Transformation Extender, JSS, NGINX, Adobe Illustrator, WebView, Webpack, WTX, Amazon Elastic Container Service (ECS)
Languages
TypeScript, Sass, CSS, JavaScript, SQL, HTML, SCSS, Java 8, CSS3, HTML5, Java, TypeScript 3, GraphQL, PHP, Python
Frameworks
Express.js, Redux, Next.js, Material UI, Jest, Vanilla JS, Spring Boot, AngularJS, Ext JS, Cypress, Tailwind CSS, Recoil
Platforms
MacOS, Amazon Web Services (AWS), AWS IoT, Linux, AWS Lambda, Amazon EC2, Docker, Vercel, New Relic
Storage
PostgreSQL, MySQL, PL/SQL, Oracle9i, Oracle PL/SQL, Microsoft SQL Server, SQL Server Integration Services (SSIS), Amazon S3 (AWS S3), SQL Server Reporting Services (SSRS), Elasticsearch
Paradigms
Microservices, Scrum
Other
Software Development, WebSockets, Storybook, Full-stack, API Integration, Full-stack Development, Cursor AI, Back-end, Authentication, Amazon Route 53, Axios, Amazon RDS, Japanese, IT Project Management, SSIS Custom Components, Computer Science, SVG, Higher Order Components, React Components, Vite, PNPM, OpenID Connect (OIDC), Geospatial Data, GeoJSON, Technical Writing, FastAPI
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