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Paul MantelloPM

Paul Mantello

Lead AI Engineer (TypeScript, LLM, scale)

€750/day
Toulon, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Paul

Founding Engineer & CTO · Staff Engineer · AI in production

I help AI startups go from fragile POCs to platforms that large enterprises are willing to sign.

12 years in production. 7 years deploying AI in production (LLM, RAG, STT).

What I've recently done (2024-2026): CTO of Seedext, an AI startup from the Microsoft GenAI Studio.
→ Scaled team from 3 to 12 engineers in 12 months, 0 churn
→ +500% revenue in the year I joined
→ 500 → 4,500 meetings/day, GCP → Azure migration, distributed architecture
→ LLM / RAG / STT pipeline in production
→ Launched ISO 27001 and SOC 2 to unlock CAC40 deals

Before that: Naval Group (4 years, AI predictive maintenance for the French Navy), Sopra Steria (3 years), plus missions at TeamOut (YC W22), La Boîte Immo, Sourcinn.

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THREE TYPES OF ENGAGEMENT

- FRACTIONAL CTO — 2 to 3 days/week, minimum 3-month commitment
For startups of 20-100 people without a CTO, or with an overwhelmed solo CTO. I take on the tech roadmap, team structuring, and critical hands-on projects.

- STRUCTURING AUDIT — 6 weeks, fixed fee
Shared tech diagnosis before a VP Eng recruitment, a funding round, or an architectural pivot. Delivers actionable insights that a developer can execute on Monday morning.

- STAFF ENGINEER IC — full-time, 3 to 6 months
When the team is running but lacks a senior profile to lead a critical project (critical feature development, cloud migration, AI pipeline, scalability, security certification).

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I AM MOST USEFUL WHEN

→ An AI product needs to move from POC to reliable production
→ We need to achieve the first ISO 27001 or SOC 2 certification
→ We need to scale a tech team from 5 to 15 without losing velocity

Contexts where I'm not the right fit: showcase websites, simple e-commerce, no-code. I can recommend the right people if needed.

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Based in Toulon. Remote-first. Travel possible.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Toulon (up to 50km), Paris (up to 20km), Lyon (up to 10km), Aix-en-Provence (up to 10km)

Experience

  • Seedext
    Founding Engineer & CTO · 500% annual growth
    SOFTWARE PUBLISHING
    November 2024 - Today (1 year and 7 months)
    Paris, France
    Seedext is the mandate that sums up what I can do. An AI startup with a working product, CAC40 ambition, and zero infrastructure to meet those promises.

    I tackled this head-on. Complete migration to Azure, architecture overhaul to handle the shift from 500 meetings per month to 4,500 per day, deployment of custom LLM, RAG, and Speech-to-Text pipelines, ISO 27001 certification in progress, and a team structured from 3 to 12 engineers in twelve months. Revenue grew by 500% in my first year.

    This is the type of mission where you need to wear multiple hats, know how to prioritize under pressure, and never lose sight of the product goal. This is exactly where I am most useful.
    TypeScript LLM RAG Next.js Microsoft Azure
  • Teamout inc
    Senior Engineer · YC San Francisco · Remix/Node Stack
    HOSPITALITY
    August 2024 - November 2024 (3 months)
    New York, United States
    American scale-up from YCombinator, responsible for developing software to plan and organize high-end corporate seminars.
    Implemented complex search similar to Booking.
    Designed and developed a seminar invitation and planning app, managing invitations and responses.
    React.js Remix Node.js Prisma Sentry
  • NGE
    Staff Engineer
    CIVIL ENGINEERING
    March 2023 - August 2024 (1 year and 5 months)
    Le Havre, France
    Development of a Smart-City hypervisor with complex and customizable dashboards, alarm creation, rights management, creation of a mapped inventory, access management, video surveillance.
    Connection with a Go and Node.js back-end to display sensor and camera data in real-time.
    Angular Node.js Jasmine Socket.io TypeScript

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Education

  • Engineering degree, Computer Engineering
    ISEN - School Page - School of Engineering in High Technologies and Digital
    2014
    Diplôme d'ingénieur, Ingénierie informatique

Certifications

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