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William HollacsekWH

William Hollacsek

CTO Fullstack React Typescript 🚀 Agentic AI

€849/day
1 project
Paris, FR
8-15 years

Average response time: 1 hour

About William

🇬🇧 English below 🇺🇸

Bonjour 🚀

CTO as a service, Architecte et développeur Fullstack je vous accompagne dans la création de vos projets tech.

Je conçois l'architecture et gère la direction produit en mettant en place des stratégies agiles qui correspondent à vos ambitions.

Je suis un ingénieur diplômé et je fais parti de la communauté Techstars que j'ai rejoint en 2020 avec ma précédente Startup.

Spécialisé dans le développement d'applications depuis plus de 7 ans je maîtrise le développement Cloud, Backend, Frontend et Mobile. Fort de cette experience, il me tient à coeur de réaliser des applications de qualité en mettant l'expérience utilisateur au coeur de la stratégie.

Ouvert et passionné, je suis à l’écoute des besoins et attentes de mes clients.
Parlez-moi de votre projet dès maintenant !


🇬🇧🇺🇸

Hello 🚀

CTO as a service, Architect and Fullstack developer, I help you build your technical projects.

I design the architecture and manage the product direction by implementing strategies that meet your ambitions.

I have a diploma in engineering and I am part of the Techstars community that I joined in 2020 with my previous Startup.

Specialized in application development for more than 7 years, I master Cloud, Backend, Frontend and Mobile development. With this experience, it is important to me to create quality applications by putting the user experience at the heart of the strategy.

Open-minded and passionate, I am attentive to the needs and expectations of my clients.

Looking for an efficient and effective partner?
Get in touch now!
  • English

    Native or bilingual

  • French

    Native or bilingual

  • Chinese

    Fluent

  • Spanish

    Basic

Remote only
Primarily works remotely

Experience

  • Stealth startup
    Technical Consultant
    TECH
    November 2022 - December 2022 (1 month)
    Leveraging this new AI trend with GPT-3 this customer wants to follow the steps of AvatarAI to allow end-users to send AI generated postcards for each life occasion (birthday, wedding, christmas, etc.)

    The web app was built using Next.js (Typescript, React & Bulma) on the frontend and Supabase (Postgres) as the backend. With the API hosted on Vercel serverless functions.

    Integration with OpenAI's GPT3 DALL-E and Davinci completion API were made to generate images and postcard messages.

    This MVP was built in 2 weeks and successfully launched on ProductHunt https://www.producthunt.com/products/postedby-ai
    React.js openai api intelligence artificielle PostgreSQL Supabase Stripe
  • Stealth startup
    Interim CTO
    TECH
    June 2022 - August 2022 (2 months)
    Toronto, Canada
    The customer is a FinTech startup providing payday loan to end-users. They needed to improve the overall business operations by automating user approvals and loan approvals.

    My responsibilities include improving business operation and setting technical direction by removing technical debt and improving code quality.

    To minimize time spent on internal tooling I implemented a approval dashboard using Retool connecting to our Postgres database.
    Supabase React.js JavaScript Typescript API PostgreSQL
  • Hiki
    Technical Consultant
    TECH
    May 2021 - June 2021 (1 month)
    New York, United States
    The customer is a dating app for people on the spectrum. Their development were stopped by immense technical debt and infrastructure costs.

    I helped them migrate the backend from Firebase to a scalable architecture on GCP that I designed. The new backend was deployed as Cloud Run containers with the API using Hasura in combination with Cloud SQL Postgres to produce a uniform Graphql API.

    We successfully minimized operation costs and increased developer productivity.
    Firebase JavaScript Google cloud Firestore PostgreSQL Hasura GraphQL

Reviews

5.0

Out of 1 rating

OlivierO

Olivier

REVERALL - CHURN HERO

Reviewed on 10.04.2023

Excellente mission avec William. La mission était assez complexe pour comprendre l'historique, William l'a intégré rapidement. William a beaucoup apporté à mon projet en qualité au-delà de ce que j'avais exprimé, et le tout dans les délais contenus. Je n'hésiterais pas à retravailler avec lui.

Recommendations

Max BermanMB
Thomas StockerTS
Jules LagadicJL
+1
Max Berman and 3 other people have recommended William

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Education

  • Engineer's Degree, Computer Science
    UTBM
    2015
  • Master's Degree, Computer Science
    Korea Advanced Institute of Science and Technology
    2015
    Exchange semester spring 2015

Skill set

Categories