Raphaël Léger

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AI Engineer & Lead Developer Full Stack

Nov 2022 - Current (3 years 10 months)

Booking sector client - Designed and developed a fully functional conversational AI agent to perform bookings. With tool calling, web search grounding, retrieval-augmented generation (RAG), ranking, streaming and token optimization for low-latency. LLM-based deepeval for efficiency testing. Languages learning sector client - Set up AI pipelines to ensure product & code quality standards, to handle internationalization of +20 languages, to automate and scale assets generation. Fully designed and developed linguistic web and mobile apps, implemented grammatical rules, with learning acquisition and reinforcement learning algorithms, gamification. Health sector client - Implemented AI-based optical character recognition for insurance cards + se

Full Stack Developer - Freelance

Alma

Oct 2021 - Oct 2022 (1 year 1 month)

- Designed and developed a new service enabling Apple as a flagship merchant to offer a complete split payment solution to its customers, both in Apple stores and online. FRONTEND: React, Vue.js, JavaScript, TypeScript, Cypress BACKEND: Python, FastAPI, SQLAlchemy, Docker, Docker Compose, Serverless, Terraform, Google Cloud Platform

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Lead Back End Developer - Freelance

Feb 2021 - May 2021 (4 months)

- Set-up a digital platform designed to gather memories of the pandemic and actively serve research in order to emerge strengthened from this ordeal and prepare for future crises. FRONTEND: React, Next.js BACKEND: Next.js, Node, Express, Prisma, Jest, PostgreSQL, Docker-compose Misc: Vercel

Lead Front End Developer - Freelance

Grupo Mediapro

Jul 2020 - Aug 2020 (2 months)

- Led the development of front-end widgets to be displayed on a french high-traffic website. The widgets were built from scratch and display real-time soccer matches scores and statistics as well as team and players statistics. FRONTEND: React, hooks, JavaScript, Preact, Preact Habitat, Webpack.

Technical Interviewer - Freelance

Comet

Nov 2019 - Feb 2020 (4 months)

- Led technical interviews to assess candidates developing skills, using a drill down approach.

Student Mentor - Freelance

OpenClassrooms

Aug 2019 - Jul 2020 (1 year)

- Accompanied individual students willing to become Developers over a one-year learning path. This role included sharing knowledge, setting appropriate weekly goals and following up.

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Lead Full Stack Developer - Freelance

Apr 2019 - Sep 2021 (2 years 6 months)

- Over two years, I took part in building from scratch the technical infrastructure of the company, a majority of the services and products. Less than 10 people then, now counting 70+ people, a dozen of developers and +10 products used daily. - I designed, developed, tested and deployed web applications enabling brokers and underwriters to determine the prices of parametric insurances against poor climate and natural catastrophes: drought, wildfires, cyclones, frost, hail. - I also helped recruiting developers by leading technical interviews and ensured the newcomers follow good practices. FRONTEND: React, JavaScript, TypeScript BACKEND: Node.js, Nest (NestJS), Python, Django, Numpy, Pandas, GeoPandas, PostgreSQL, Postgis, Docker, Kubernete

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Lead Front End Developer - Freelance

Feb 2019 - Apr 2019 (3 months)

- Designed and developed a fully functionnal component-based video player to replace the existing legacy video player. - Trained employees to use React efficiently, shared general development good practices and React-specific practices, performed audits on existing projects, set up long-term tools to ensure the applications are robust and easy to update. FRONTEND: React, Redux, JavaScript, Webpack, Video.js, npm.

Full Stack Developer

Owkin

Apr 2018 - Feb 2019 (11 months)

- Designed and developed a platform enabling machine learning technology to be at the disposal of scientists to augment medical and biology research. - Evolved this platform from a proof-of-concept to a fully usable application by plugging in the first machine learning algorithms and by working on the user experience and the user interface. FRONTEND: React, Redux, JavaScript, Webpack BACKEND: Node.js, Express, Socket.io, Python, Django, Celery, Numpy, Pandas, Docker, Ansible, Jenkins, API REST, Google Cloud Platform GCP: Google Compute Engine

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Full Stack Developer / Product Manager

Sep 2017 - Apr 2018 (8 months)

- Led the design and development of the public website, drastically improved the user acquisition and the conversion rate by working on the user experience (UX) and the user interface (UI). - Designed and developed the web application ensuring the efficient preparation of the ~500 products delivered each day from several kitchens in Paris by providing tools making this daily task convenient, fast and letting significantly less place to human errors. - Designed and developed web interfaces saving the internal teams hours of work-time every day - daily operations, sales, communication. FRONTEND: React, JavaScript, AngularJS, Grunt, Gulp, Webpack BACKEND: Node.js, Express, Amazon Web Services (AWS: ELB, IAM, ECS, EC2, S3, ROUTE53, CLOUDFRONT),

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Lead Web Developer

Sep 2014 - Aug 2017 (3 years)

- Led the design and development of a highly functional website within a 3-week time span. Its goal was to allow individuals to be warned in case of electricity cuts nearby. - Led the development of a website anchored in a one-month rescue-plan for a stalled project. Its goal was to allow individuals to visualize their electricity consumption. - Developed a website for emerging new players in the electricity market. FRONTEND: JavaScript, AngularJS, Selenium BACKEND: Node.js, Java EE, Spring, Hibernate, JPA, Heroku, PHP, mySQL, ORACLE, PostgreSQL. MISC: Jenkins, Jira, Scrum, Agile.

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Lead Web Developer

Jul 2014 - Aug 2014 (2 months)

- Designed and developed a tool allowing 350 scientists to manage access permissions over their cancer research data. - Created visual tools that periodically check the consistency of millions of medical data collected, spotting up outliers. FRONTEND: JavaScript, jQuery BACKEND: Java EE (J2E), Struts 2, MySQL

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Head Of Web Development

Feb 2013 - Apr 2013 (3 months)

- Developed a website allowing individuals to buy their products directly from the nearest farmers without the usual intermediaries. FRONTEND: JavaScript, jQuery BACKEND: PHP, MySQL, PostgreSQL

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Android mobile development

City Domination - Start-up

Jul 2012 - Oct 2012 (4 months)

- Designed and developed a geo-located multiplayer strategy game for Android. 500,000-1.000.000 installs on Google Play (Android). FRONTEND: Android (Java) BACKEND: PHP Symfony, APIs RESTful, Google Maps API, MySQL, PostgreSQL

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Lead Web Developer

Feb 2012 - Jan 2015 (3 years)

- Acquired a consequent community of players (from 100 to +1,500,000 players) through the development of various functionalities: private messages, friends system, groups of players, mentoring, game invitations, public achievements, Facebook integration. - Enhanced the user retention rate by working on user comfort, ergonomics, landing pages, tutorials for newcomers. - Created back-offices and interfaces for administration and support (used daily by a team of 30 people). - Integrated custom and non-intrusive ad systems. FRONTEND: JavaScript, jQuery BACKEND: Node.js, Express, Socket.io, PHP, Analytics, Facebook OpenGraph, Redis, MySQL, PostgreSQL, MongoDB (NoSQL) MISC: Agile, Kanban, Trello

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