01
Design the right thing
I start from the actual need, the user flow and the business constraints before committing to implementation details.
Full-stack engineer based in Reunion Island
I build clear interfaces,solid backendsand products meant to last.
Sébastien Legros·Ingénieur Logiciel Full Stack
12+Projets
5+Ans d'XP
8+Technos
Sébastien Legros
Ingénieur Logiciel Full Stack
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An approach shaped by clarity, product thinking and execution
I favor systems that stay easy to evolve, interfaces that stay readable, and technical decisions that genuinely support the product.
I enjoy building real-world web applications and business desktop software: back-offices, SaaS platforms, custom C# applications, APIs, payment flows, content systems, integrations and internal tools. My goal is to turn a fuzzy need into something usable, stable and clean to maintain over time.
12+Projets livrés
5+Ans d'expérience
8+Technologies
Open to freelance
02
Build it cleanly
Structure, naming, controlled technical debt and codebases the team can pick up without friction matter a lot to me.
03
Ship with confidence
CI/CD, Docker, APIs, perceived quality and interface polish: the finish matters as much as the feature itself.
Selected work
Projects built to be useful, not just attractive
4A selection of products and tools where I worked on architecture, experience and production readiness.
Business CRM Platform
Design and development of a complete CRM to centralize prospect management, partner workflows, campaign tracking and business automations.
ReactGoGraphQLPostgreSQL
- Role
- Technical design, data modeling, Go GraphQL APIs, React back-office interfaces and third-party service integrations.
- Impact
- A unified platform foundation to track customer cases, automate communication workflows and support multiple operator configurations.
Therapeutic Care Platform
A specialized care platform combining structured content, patient follow-up and domain-specific therapeutic workflows.
ReactGoRESTPostgreSQL
- Role
- Full-stack development of the React application, Go REST API, PostgreSQL modeling and overall patient journey structuring.
- Impact
- A clearer tool to manage content, therapeutic goals and patient relationship flows in one coherent place.
Gamification & Campaign Engine
Back-office and APIs to orchestrate game mechanics, subscription plans and reward flows around physical activation triggers.
ReactGoRESTStripe
- Role
- Go API design, admin tooling, Stripe subscriptions, virtual wallet system and operator-facing management interfaces.
- Impact
- A technical base able to orchestrate campaigns, users, rewards and transactional logic without fragmented tooling.
Mobile Audio Content Platform
GraphQL backend and editorial back-office for a mobile application delivering structured audio content to end users.
ReactGoGraphQLMobile backend
- Role
- Model design, GraphQL APIs, administration interfaces and tooling for content publishing and user management.
- Impact
- A more reliable stack to operate the product, manage content publishing workflows and keep administration straightforward.
More work
Automated Editorial Pipeline
+An automated video editorial pipeline in Go with a Next.js dashboard, Remotion/FFmpeg video rendering, subtitle generation and content orchestration.
Document Management Suite
+A Go API plus React back-office ecosystem to manage documents, business workflows, structured content and admin tooling.
Cinema Alert Platform
+A Next.js cinema-focused application with Supabase, Redis, Stripe payments and alert-driven notification logic.
E-learning English
+A learning platform built with Next.js, Prisma/PostgreSQL, rich interfaces, content import flows and AI-assisted features.
Guided Podcast Platform
+Mobile audio content app with APIs, editorial pipeline, i18n and structured product logic.
Payments & KYC Back-Office
+Web platform for MangoPay payment management: payment flows, KYC verification, wallets and reconciliations.
VIP Campaign Back-Office
+Back-office for SMS campaign management and VIP guest information handling under operational constraints.
SQL Loyalty Analytics
+SQL query optimization and performance work on a mobile loyalty product with complex data models.
Accessibility Field App
+Android application to locate wheelchair-accessible places and enrich accessibility field information.
Interest-Based Matching App
+Android app matching people through shared interests and geolocation-based proximity.
Expertise
A hybrid profile across web applications, business APIs and desktop software, with a stack built to stay maintainable over time.
Web
React/TypeScript and Next.js interfaces, Blazor back-offices in C# — from component to production.
- React
- Next.js
- TypeScript
- Blazor
- C#
API & data
REST and GraphQL APIs in Go, Node.js or ASP.NET Core, on PostgreSQL and SQL Server — clean architecture, solid business logic.
- Go
- Node.js
- ASP.NET Core
- GraphQL
- REST
- PostgreSQL
- SQL Server
Software
Business desktop applications in the .NET ecosystem with productivity-oriented frameworks and rich UI tooling.
- C#
- XPO/XAF
- DevExpress
- WPF
- WinForms
Background
A path from infrastructure to product engineering, then technical leadership.
Education
2010 - 2012
DUT Networks & Telecommunications
Education
2010 - 2012
DUT Networks & Telecommunications
2010
Education
2012 - 2015
Computer & Telecommunications Engineering Degree
2012
Education
2012 - 2015
Computer & Telecommunications Engineering Degree
Work
2016 – 2017
Research Engineer — IRD
Built web and mobile tools for research data collection and visualization.
Work
2016 – 2017
Research Engineer — IRD
Built web and mobile tools for research data collection and visualization.
2016
Work
2017 – 2021
Systems & Networks Administrator — Reunion Region
Infrastructure, security, operations and a strong reliability mindset.
2017
Work
2017 – 2021
Systems & Networks Administrator — Reunion Region
Infrastructure, security, operations and a strong reliability mindset.
Work
2021 – 2022
Web Developer — Squirrel
Built React interfaces, integrated APIs and grew into product-driven development.
Work
2021 – 2022
Web Developer — Squirrel
Built React interfaces, integrated APIs and grew into product-driven development.
2021
Work
2022 – 2025
Software Engineer / Lead Web Developer — Squirrel
Architecture, full-stack development, GraphQL/REST APIs, data modeling and CI/CD pipelines.
2022
Work
2022 – 2025
Software Engineer / Lead Web Developer — Squirrel
Architecture, full-stack development, GraphQL/REST APIs, data modeling and CI/CD pipelines.
Work
2026 – aujourd'hui
Software Designer & Developer — Willow
Design and development of web and business applications with C#, MVVM, WPF, WinForms, DevExpress and Blazor, powered by SQL Server, XAF/XPO, Azure AI and Azure DevOps.
Work
2026 – aujourd'hui
Software Designer & Developer — Willow
Design and development of web and business applications with C#, MVVM, WPF, WinForms, DevExpress and Blazor, powered by SQL Server, XAF/XPO, Azure AI and Azure DevOps.
2026
Contact
Need to structure, ship or strengthen a product?
I can help on an existing product, a technical foundation that needs to be stabilized, or a new initiative that should start cleanly.
Open to freelance work
Or directly by email slegros9@gmail.com