FH

Frederic Hasse Lot

Available to hire

I’m a full-stack web developer with 25+ years of experience building modern products, from interactive front-ends to robust back-end services.

About

I’m a full-stack web developer with 25+ years of experience building modern products, from interactive front-ends to robust back-end services. I work across JavaScript/React, Ruby on Rails, Python microservices, PostgreSQL, and production-grade infrastructure, and I enjoy turning complex ideas into smooth, reliable user experiences.

Over the years, I’ve also driven real-time and media-focused development—such as an end-to-end AI-assisted vertical video editor for social platforms—handling video processing pipelines with tools like FFmpeg and GPU/CPU acceleration. Whether it’s payment systems, background jobs, CI/CD, or GDPR-focused security, I bring a practical, team-friendly approach and keep shipping improvements continuously.

  • 24 years' experience
  • Joined October 2026

Languages

  • FrenchFluent

Industry experience

  • Government
  • Software & Internet
  • Media & Entertainment

More experts in Paris, France

Work experience· 4 roles

Full-Stack Developer · WikioApr 2025 – Present · 1 yr 8 mos

Designed and built an end-to-end web video editor to generate and edit vertical short clips for social media (TikTok, Reels, Shorts). Developed highly interactive JavaScript/Stimulus.js front-end features such as timelines, waveform editing, segmented editing, real-time previews, and keyframe-animated video framing; also implemented multi-track compositing for audio/video/images. Built a Ruby on Rails back-end supporting multi-tenancy, plus Python microservices for video processing using FFmpeg with GPU/CUDA and ONNX-based pose detection. Integrated Stripe payments, background jobs (Sidekiq), S3 storage, multi-platform rendering, and an export pipeline. Managed draft/publish versioning with auto-save and conflict handling, and worked within CI/CD, web security, and GDPR compliance under an Agile Scrum process.

Ruby on Rails Developer · City of Paris (paris.fr)Jan 2018 – Apr 2025 · 7 yrs 4 mos

Built paris.fr from scratch and maintained it for over 6 years (still live in current form). Contributed to a high-traffic public service platform by delivering full-stack Ruby on Rails development with interactive interfaces (JavaScript/Stimulus.js, HTML5, CSS3). Managed and optimized PostgreSQL databases, implemented REST APIs, and established CI/CD pipelines for testing and deployment automation. Worked within a multidisciplinary Agile team with a focus on web security and GDPR compliance.

Web Developer · Freelance (Slates.f r)Jan 2011 – Mar 2014 · 3 yrs 3 mos

Developed a web iPad version of a magazine using JavaScript and InDesign.

Web Developer · FreelanceJan 2002 – Mar 2018 · 16 yrs 3 mos

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