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Boris S.BS

Boris S.

Senior Software Engineer / AI Engineer

€520/day
3 projects
Nantes, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Boris

Lead Fullstack Dev, Architect & PO — for startups that want to move fast, well, with a human in the loop.
15 years of technical experience, two projects I'm building in parallel (GTM, user discovery, hands-on PO), and a strong preference for small teams where every decision counts.
Full-stack (Java, Angular, React, NestJS, Python), scalable architecture, AI/ML — production RAGs, agents, harness engineering, and Claude Code to multiply velocity. I take on the PO role when needed to translate business needs into an actionable backlog.
What I bring:
✅ Rare versatility: back-end, front-end, DevOps, AI, architecture. One person, low coordination costs.
✅ Founder mentality: I build my own products, so I speak MVP, scope-cutting, and trade-offs. I understand founder constraints because I live them too.
✅ Pragmatic: simple, maintainable, scalable solutions. No over-engineering.
✅ People-focused: I believe we work better when we get along. I listen, I share, I train — several former juniors still reach out.
My current projects:
🌱 manyformany.org — a platform to help non-profits mobilize and engage their volunteers.
💬 Skoa — a tool to improve Quality of Work Life and employer-employee relations in SMEs without dedicated HR. Sensitive questions asked anonymously.
Recent missions:
• ESG reporting for a startup, in a 3-person squad — acquired 6 months later.
• Complex data configuration tool + in-house AI model for an early-stage fintech — acquired 2 years later.
• Scale-up legacy system overhaul: -50% bugs, significantly improved velocity.
• Design and production deployment of AI RAGs and agents, harness engineering with Claude Code to accelerate development.
• Mentoring junior developers.
My playgrounds: early-stage, fast decisions, small teams, impact-driven topics (forGood).
Off the keyboard: surfing, wingfoiling, woodworking, improv, music, basketball, family, doing my best.
  • English

    Fluent

  • French

    Native or bilingual

Can work on-site
Nantes (up to 15km)

Experience

  • SAMI
    Lead Dev
    SOFTWARE PUBLISHING
    September 2024 - January 2026 (1 year and 4 months)
    Nantes, France
    Startup development of an ESG reporting tool (measuring corporate impact), incorporating complex rules and models.
    HuggingFace Apollo GraphQL React.js
  • Sigma Group
    Lead Developer / Technical Expert
    DIGITAL AND IT
    July 2023 - September 2024 (1 year and 2 months)
    Nantes, France
    Creation and monitoring of a legacy code urbanization roadmap.
    Evangelizing good code practices.
    Development of software components
    Expert support for developers
    Tech Lead Software Craftsmanship Java Angular Hexagonal Architecture
  • ELAP
    Fullstack Java/Angular Engineer
    PUBLIC SECTOR
    January 2022 - July 2023 (1 year and 7 months)
    Development of the training tracking tool for SDIS 13 (Bouches du Rhône firefighters):
    Logistical management of specific equipment and accommodations.
    Tracking of training paths and certifications (and their maintenance) for personnel
    Online tool for title allocation committees
    Java Angular SQL

Reviews

5.0

Out of 3 ratings

HuguesH

Hugues

Alrytech

Reviewed on 2/28/2022

AlexisA

Alexis

The Fast Marketing Cloud Software Solutions

Reviewed on 12/6/2021

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Education

  • Data Sciences Starter Program
    X Polytechnique
    2020
    La formation certifiante sur les meilleurs outils méthodologiques pour appréhender et exploiter les données et notamment les données massives (Big Data). Une immersion dans l’univers de la donnée à travers un parcours intensif portant sur les fondamentaux en sciences des données.
  • JAVA Analyst and Developer
    AFCEPF
    2010

Certifications

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