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David KublerDK

David Kubler

Senior Frontend Developer / Blockchain Solana

€500/day
Aix-en-Provence, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About David

I am one of those rare profiles who can speak as well to a designer as to an engineer because I am both.

For over 10 years, I have been designing and developing products end-to-end: from the idea on Figma to production deployment. This dual expertise allows me to deliver polished, coherent, and high-performing interfaces without ever sacrificing user experience for technical constraints, or vice versa.

References: Artrade, Free Pro, Thales, Gojob, Rofim, Secure Systems.
  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Aix-en-Provence (up to 50km), Marseille (up to 50km), Lyon (up to 50km), Paris (up to 50km), Toulouse (up to 50km)

Experience

  • Artrade
    CTPO
    TECH
    June 2023 - Today (3 years and 2 months)
    As CTPO, I drive the entire technological and product strategy for a Web3 marketplace on Solana. I manage a multidisciplinary team of developers (frontend, backend, Solana) and lead product design and experience.
    Key achievements:

    • Complete platform overhaul: full redesign and code refactoring to optimize performance and scalability
    • Strategic adaptation: successful navigation through several business pivots (NFT marketplace, RWA marketplace, Raffle, Auction)
    • Blockchain development: design and implementation of smart contracts on Solana with the Anchor framework (auction systems, raffles)
    • Significant growth: structuring a marketplace now used by over 10,000 users

    My role combines technical leadership, product vision, and operational execution to transform a Web3 startup into a stable and growing platform.
    Vue.js Deno Anchor Solana Laravel
  • Netshot
    Product Designer & Frontend Engineer
    TECH
    January 2024 - December 2024 (11 months)
    Marseille, France
    Hired as a freelancer to modernize a network configuration and compliance management application, I led the complete overhaul of the platform, from initial audit to production deployment.
    Key achievements:

    • UX Audit: in-depth analysis of the existing application (Backbone.js) to identify user pain points and define the migration strategy
    • UI Design: creation of over 40 views and a complete design system ensuring visual consistency and scalability
    • Frontend Development: complete reconstruction of the application in React with Chakra UI, TanStack Query, React Hook Form, and Monaco Editor for configuration editing
    Functional scope: configuration backup and history, network inventory (IP, MAC, serial numbers), software/hardware compliance, configuration policies, automated changes via REST API
    Multi-vendor compatibility: support for major equipment manufacturers (Cisco, Juniper, Fortinet, Alcatel-Lucent)

    This assignment allowed me to combine design expertise and frontend development on a high-value technical product for network teams.
    React.js Chakra UI TanStack Query react hook form Monaco editor
  • Free Pro
    Senior Frontend Developer
    TELECOMMUNICATIONS
    November 2022 - June 2023 (7 months)
    Marseille, France
    Hired as a freelancer to join the R&D team during its structuring phase, I led the complete UI/UX and frontend overhaul of a uCPE (universal Customer Premises Equipment) administration application.
    Key achievements:

    • Product transformation: refactoring of an MVP React application into a production-ready, scalable, and maintainable solution
    • Full-stack architecture: development of a backend in Kotlin to ensure communication between the web application and the Cisco NSO orchestrator using the YANG language
    • Design system: creation and implementation of a complete design system (Figma + Chakra UI) ensuring consistency and efficiency
    • Product innovation: design and development of a visual editor for managing virtual machine infrastructures
    • Network skills development: acquisition of technical expertise in network infrastructures and orchestration systems
    • Knowledge transfer: training Junior developers on the use of my boilerplate and development best practices

    This assignment allowed me to combine product vision, technical excellence, and leadership, while working in a demanding R&D environment within a major telecommunications player.

Recommendations

Martin GirardMG
SC
PW
Martin Girard and 2 other people have recommended David

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Education

  • School of Solana Season 6
    Ackee blockchain school
    2025
    Devenir développeur Solana
  • Become a Solana developer
    Alyra
    2025

Skill set

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