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Sebastien PencréachSP

Sebastien Pencréach

Senior Developer & Agile Coach

€700/day
Bordeaux, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sebastien

Independent web developer, I transform your critical spreadsheets into reliable applications.


I have been a fullstack JavaScript and TypeScript developer for seventeen years. Through my company Soclo Conseil, I support the leaders of SMEs facing a recurring observation: their business software covers the essential of their activity, but the rest is held on a critical spreadsheet, an aging internal tool or an application quickly put together with generative AI.
These tools are not your teams' business. It is mine.

What I offer

I build custom web applications, delivered in four to six weeks, from the first meeting to production deployment. The service is billed at a fixed price, with an initial scoping phase whose amount is announced from the first exchange and deducted from the price if the mission continues. Payment is spread between launch, delivery, and the end of the thirty-day warranty period.

My method

I work in short cycles, with regular demonstrations of what is being built. I document as I go so that the application remains maintainable once the mission is completed. The goal is to lay a reliable foundation on which your teams can rely in the long term, without dependence on my continuous intervention.

My technical profile

Main stack: TypeScript, Node.js, Vue.js, PostgreSQL, hosted on European cloud infrastructures.

I design simple, readable architectures adapted to the project size, favoring technical choices that remain understandable by other developers.

My background

Seventeen years of web development, including several years on long-term assignments for projects with a strong business component. I work remotely from Bordeaux, throughout France. Currently available for missions complementary to an existing commitment ending in September 2026.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Soclo conseil
    Agile Fullstack JS/TS Coach
    SOFTWARE PUBLISHING
    April 2025 - Today (1 year and 2 months)
    Bordeaux, France
    I support SME software publishers with a dual technical and organizational role, by diagnosing friction points:
    • Understand the root causes that block production (too many bugs, communication problems, ineffective meetings).
    • Support teams on software modernization issues: code quality, structuring practices (BDD/TDD, DDD, SOLID), architecture and stack choices.
    During my last mission, 3 months were enough to obtain a product plan and a roadmap that allow us to become competitive again.
    Result: a better customer satisfaction rate, and proud internal teams.
    Agile methodology Node.js .NET Vue.js Process facilitation
  • fabriq
    Senior Software Development Engineer
    RAW MATERIALS INDUSTRY
    January 2023 - April 2025 (2 years and 3 months)
    50% reduction in production bugs through the implementation of craft practices (TDD, pair/mob programming). Structuring the product team around Lean, focusing on delivery reliability. Coaching developers on small step iteration and continuous improvement. Improved inter-team communication through regular testing sessions. Facilitation of support/sales exchanges for better customer satisfaction.

    Architecture and development of a centralized authentication solution with Auth0. Technical lead on Auth0 integration in a microservices environment. Implementation of secure token propagation between services. Development of a reusable frontend library for authentication. Participation in the "frontend platform" team to equip product teams. Application of craft practices: pair/mob programming, TDD.
  • ilek
    Senior Frontend Developer
    ENERGY AND UTILITIES
    January 2021 - January 2022 (1 year)
    Toulouse, France
    Migration of the frontend architecture to a hexagonal structure. Modernization of the testing environment (Puppeteer to Cypress). Evangelization of good frontend development practices. Training teams in pair programming and code reviews. Improvement of existing code maintainability.

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Education

  • Professional License, Computer Science
    2009
    Licence Professionnelle, Informatique

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