What does a Fractional CTO do?

A Fractional CTO provides senior technical leadership on a part-time basis. I set the architecture, mentor your engineers, make technology decisions, and keep your product moving forward. You get full-time strategic thinking without the full-time cost.

Who do you typically work with?

I work with startups and scale-ups that need senior technical leadership. Whether you are a non-technical founder who needs a CTO, a growing team that needs architecture guidance, or an investor doing technical due diligence, I can help.

What technologies do you specialize in?

I specialize in React, TypeScript, Next.js, and modern SaaS architecture. I also build AI agent systems for production use. On the backend, I work with Node.js, PostgreSQL, and cloud platforms like AWS and GCP.

How does the engagement work?

It starts with a free discovery call where we discuss your project and goals. From there, I propose a tailored engagement. This can range from a one-time architecture audit to ongoing fractional CTO work, depending on what you need.

I am based in Toulouse, France, and work with clients worldwide. Most of my engagements are remote, though I am available for on-site work across Europe when needed.

What is your experience with AI and AI agents?

I build AI agents that work in production, not just demos. I deploy systems that automate workflows, integrate with existing tools, and deliver real business value. This includes working with LLMs, agent frameworks, and custom automation pipelines.

I ship products, build teams, and deploy AI systems for founders who need to move fast

Fractional CTO & AI Consultant · 10+ years React, TypeScript & SaaS

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10+

Years in tech

CTO experience

50+

Products shipped

Countries worked in

Trusted by teams at

What I Do

10+ years building products for startups and enterprises. I bring senior technical leadership to teams that need it most.

Fractional CTO

Your startup needs technical direction but not a full-time CTO. I step in, set the architecture, mentor your engineers, and keep your product moving. Part-time commitment, full-time thinking.

Frontend Architecture

Slow builds, tangled components, performance issues? I restructure React and Next.js codebases so your team ships faster without breaking things. Audits, migrations, and hands-on fixes.

AI Agent Systems

I build AI agents that actually work in production. Not demos, not proof-of-concepts. Real systems that automate workflows and plug into your existing tools.

Technical Due Diligence

Investing in a startup? Acquiring a product? I dig into the code, the architecture, the team practices, and give you a straight answer on what you are buying.

Leading High-Performing Frontend Teams: A Practical Guide for Tech Leads

January 16, 2026

Learn how to lead frontend engineering teams effectively. Discover strategies for mentoring, code reviews, technical decision-making, and building a culture of excellence based on 10+ years of experience leading teams at scale-ups and enterprise organizations.

Modern Frontend Development: React, TypeScript, and Next.js Best Practices for 2025

January 16, 2026

Discover modern frontend development best practices for React, TypeScript, and Next.js. Learn performance optimization techniques, type safety patterns, and architectural decisions from 10+ years of building production applications.

Building Scalable Frontend Architecture for B2B SaaS: Lessons from 10+ Years of Engineering

January 16, 2026

Learn how to design and implement scalable frontend architecture for B2B SaaS applications. Discover proven strategies for React, TypeScript, and Next.js that I've used to stabilize fragile codebases and scale platforms serving fast-growing e-commerce brands.

Work

Company
Prediko
Role
Technical Lead
Date
Aug 2022 Nov 2025
Company
Airbus
Role
Technical Lead
Date
Apr 2021 Jul 2022
Company
ONCODE
Role
Technical Lead
Date
Feb 2020 Mar 2021
Company
BSMART
Role
CTO
Date
Jan 2019 Feb 2020
Company
KAWAMI
Role
CTO
Date
Jan 2017 Dec 2018
Company
KAWAMI
Role
Full-stack Developer
Date
Oct 2016 Dec 2016
Company
Docteury
Role
Full-stack Developer
Date
Jun 2016 Oct 2016

Recommended by amazing people

Anya Bacon

Seif’s input into Prediko Overall and specifically Front End strategy can’t be underestimated. With his structured approach to work; extensive knowledge of the latest tools in the market and creative business mind - we really are able to develop at the immense speed.What’s great about Seif is that he always starts from a customer and really strikes a perfect balance between tech needs and business. Most importantly he is a very easy person to work with personally and always ensures the team is well lead.

Manuel A Carvalho

I worked with Seif for five months and he is an exceptional team player - selfless, responsive, and dedicated to success. Seif's positive attitude and collaborative nature make him a valuable asset to any organization.

Youri Moskovic

Seif is an experienced, skilled and disciplined engineer. He's very productive and also fun to work with. A man of many talents!

Avani Chawla

During the short period we collaborated in the same project at Airbus, I noticed that Seif is a great front end developer. He is a highly-skilled, experienced, and helpful professional with a positive attitude. He is very passionate about anything he takes on and always tries to leads his team with enthusiasm and encouragement. Working with Seif has been a great experience for me as I learned a lot from him. I beleieve any employee would be happy to have him as their team lead.

Anya Bacon

Manuel A Carvalho

Youri Moskovic

Seif is an experienced, skilled and disciplined engineer. He's very productive and also fun to work with. A man of many talents!

Avani Chawla

Frederic Drezen

Working with Seif was really great. As a portfolio manager, I've always been satisfied with his work and panel of possible solutions he proposed. Seif is both experienced professional, deadline oriented and intelligent person. Seif is a great consultant with very strong problem solving skills, definitively a valuable asset to the team and the projects. Working with Seif is a signature of success, I highly recommend him.

Afef Ayed

I've been fortunate to work with Seif for different companies and I can only say that he has always gone above and beyond to make sure everything was done well and professionally. As a marketer in a different department, I've always been happy with his support as he always delivers exactly what we need.

Dov MORYUSEF

Seifeddine est un super développeur, sa maitrise des technologies frontend et de ReactJs est impressionnante. Rapide et efficace, il trouve toujours les solutions les plus adaptées aux problématiques complexes. Très pédagogue, il est très agréable de travailler avec lui et c'est une chance de l'avoir dans son équipe.

Othmane Lahlou

Seifeddine is a very talented front end developer. Beyond his strong work ethic, he carries out most tasks with efficiency and speed. He has great technical knowledge of the field and is not afraid to take on a challenge. I highly recommend him.

Haroun Ouertatani

Étant le recruteur de Seifeddine, j'ai été impressionné par sa maitrise et sa passion sur les technologies JavaScript spécialement sur React Js et Node Js. Nous sommes sont très satisfaits de son engagement et la qualité de son travail. C'est un plaisir de pouvoir collaborer avec lui

Sirine Bejaoui

Seif is an excellent leader and manager who will show what excellent project management should be and an outstanding mentor with a rich experience in several areas. I’ve worked under his guidance for three months and I can say that he is innovative, organized as well as helpful and is always open to ideas and suggestions. He has made me improve in many professional areas and taught me about leadership skills. It was a pleasure to be managed by him during internship period.

Frequently Asked Questions

Common questions about working with me.

What does a Fractional CTO do?: A Fractional CTO provides senior technical leadership on a part-time basis. I set the architecture, mentor your engineers, make technology decisions, and keep your product moving forward. You get full-time strategic thinking without the full-time cost.
Who do you typically work with?: I work with startups and scale-ups that need senior technical leadership. Whether you are a non-technical founder who needs a CTO, a growing team that needs architecture guidance, or an investor doing technical due diligence, I can help.
What technologies do you specialize in?: I specialize in React, TypeScript, Next.js, and modern SaaS architecture. I also build AI agent systems for production use. On the backend, I work with Node.js, PostgreSQL, and cloud platforms like AWS and GCP.
How does the engagement work?: It starts with a free discovery call where we discuss your project and goals. From there, I propose a tailored engagement. This can range from a one-time architecture audit to ongoing fractional CTO work, depending on what you need.
Where are you based?: I am based in Toulouse, France, and work with clients worldwide. Most of my engagements are remote, though I am available for on-site work across Europe when needed.
What is your experience with AI and AI agents?: I build AI agents that work in production, not just demos. I deploy systems that automate workflows, integrate with existing tools, and deliver real business value. This includes working with LLMs, agent frameworks, and custom automation pipelines.

Ready to accelerate your product?

Let's talk about how I can help your team ship faster and build better software.

Get in Touch