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Heidy K.HK

Heidy K.

Software / AI Data Engineer

€600/day
Lille, FR
0-2 years
Team Management
Web Project Management
Front-End Development
Back-End Development
Data Analysis

Average response time: 1 hour

Freelancer profile translated to English.
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About Heidy

Full Stack Engineer specializing in information system architecture and data pipeline industrialization. 3 years of experience delivering .NET, Java, and Python applications in production, with a strong focus on DevOps and Cloud. Produces measurable solutions: 100% elimination of paper trails, 40% latency reduction, automated deployment in under 15 minutes. Rare combination of architectural vision, technical execution, and team leadership.
Health and Wellness
Electrical industry
Banking and Financial Services
Public Sector
Insurance

  • French

    Native or bilingual

  • English

    Conversational

Remote only
Primarily works remotely

Experience

  • AUTRES
    Backend Developer
    E-COMMERCE
    January 2026 - May 2026 (4 months)
    Complete multi-vendor marketplace platform designed from scratch. Covers the entire e-commerce cycle: catalog, cart, orders, multi-vendor payments via Stripe Connect, loyalty program, notifications. Modular monolithic architecture in Clean Architecture, ready to evolve into microservices.

    MODULAR ARCHITECTURE IN CLEAN ARCHITECTURE
    • Need for an architecture that supports progressive evolution from a modular monolith to microservices without rewriting.
    • Design an architecture with 6 independent business modules, each in Clean Architecture (Domain, Application, Infrastructure, API).
    • Definition of bounded contexts (Catalog, Cart, Orders, Identity, Loyalty, Notifications), inter-module communication via Wolverine event bus, implementation of the Outbox/Inbox pattern to ensure messaging reliability, strict separation of dependencies between modules.
    • Independently deliverable modules, possibility to extract a module into a microservice without affecting the rest of the codebase, unit test coverage above 70% on the Application layer.
    MULTI-VENDOR PAYMENTS VIA STRIPE CONNECT
    • Marketplace platform requires automatic payment distribution between the platform (commission) and each vendor.
    • Integrate Stripe Connect to manage vendor onboarding and automatic payment splitting for each order.
    • Implementation of the Stripe Connect onboarding flow (creation of Express accounts), handling webhooks to confirm payments and trigger payouts, platform commission calculation per order, multi-vendor refund management.
    • Complete payment tunnel in sandbox production, processing simulated payments with 100% accounting reconciliation between orders and vendor payouts.
    C# Next.js Stripe Docker PostgreSQL
  • NexusMart
    Software Developer
    EDUCATION AND E-LEARNING
    September 2025 - May 2026 (8 months)
    Lille, France
    School management application. .NET Backend, frontend, complete management of students, tuition payments, generation of receipts and student cards in PDF format.

    PDF STUDENT CARD GENERATION
    • Need to produce individualized student cards with photo, barcode, and administrative information.
    • Generate PDFs on the fly for each student with custom layout.
    • Integration of QuestPDF on the .NET side, creation of a card template in 85x55 mm format, embedding the photo via memory stream, generation of the EAN-13 barcode from the student ID, server-side caching to avoid regeneration.
    • Card generation in under 300 ms, batch processing of 200 cards in under a minute.
    TUITION PAYMENT AND RECEIPT MANAGEMENT
    • Difficult manual tracking of tuition payments, breakdown between registration fees, monthly installments, and additional fees.
    • Build a payment management module with history, accounting breakdown, and receipt printing.
    • Payment / Due Date / Breakdown modeling, SQL view aggregating history per student, React input screen with validation, PDF receipt printing with detailed breakdown of amounts.
    • Complete payment tracking per student for the school year, automatic receipt generation upon registration, Excel export for accounting.
    PHOTO UPLOAD AND TYPE DEBUGGING ON GENDER ENUM
    • Production bug: uploaded photos were not associated with the correct student, inconsistencies in the gender field between front and back end.
    • Diagnose and correct the entire upload and typing chain.
    • Audit of the multipart/form-data flow, alignment of front/back contracts via OpenAPI, correction of Gender enum mapping (string on API side, enum on .NET side), integration tests covering upload and persistence.
    • No more inconsistencies on student records, integration tests guaranteeing non-regression.
    C# SQL Server Entity Framework React.js
  • Face aux Risques SA
    IT & DevOps Engineer
    LOGISTICS AND SUPPLY CHAIN
    September 2024 - November 2025 (1 year and 2 months)
    Évry, France
    VPS INFRASTRUCTURE IMPLEMENTATION
    • The company operated without a centralized technical infrastructure, with scattered tools and no backup policy.
    • Design and deploy a Linux VPS infrastructure to host all business services.
    • Provisioning of a Debian VPS, Nginx configuration as a reverse proxy, implementation of Let's Encrypt SSL certificates, SSH hardening (fail2ban, root login disabled), implementation of an automated backup policy via cron with rotation.
    • Infrastructure operational 24/7 with uptime greater than 99%, restoration time reduced to less than 30 minutes in case of incident.
    DOLIBARR ERP DEPLOYMENT
    • Commercial management and invoicing performed manually on spreadsheets, with no traceability or consolidated reporting.
    • Deploy a complete business ERP adapted to fire safety constraints (management of interventions, maintenance contracts, installed equipment).
    • Installation and configuration of Dolibarr ERP/CRM, setup of the Customer, Product, Invoice, and Contract modules, LDAP integration for authentication, migration of historical data from Excel via Python scripts.
    • 100% of commercial operations centralized in the ERP, automated invoicing, reduction in quote generation time by approximately 70%.
    APPLICATION MODULE CONTAINERIZATION
    • Custom ERP modules deployed directly on the server, frequent PHP dependency conflicts during updates.
    • Isolate each module in its own Docker container to stabilize deployments.
    • Design of dedicated Docker images per module, orchestration via Docker Compose with persistent volumes for data, network separation between application services and the database, implementation of a Git release workflow.
    • Deployment of a new module reduced from 4 hours to 15 minutes, zero regressions on the production environment since implementation.
    ERP PHP Back-End Development Docker Active Directory
Check out Heidy's experience

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Education

  • Information Systems Management Engineer
    Icam Bretagne,
    2024
    Ing´ enieur en management des syst` emes d'information

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