Martin Hammerchmidt

Weezem is a mobile application available on iOS and Android that allows you to make new friends and find activities and outings. https://weezem.com I built the app and servers from scratch using React Native, Node.js, GraphQL, PostgreSQL and Google Cloud. Today, I still maintain the app and add new features. We launched the app in 2021, we now have 100k+ registered users and 1M+ messages in the messaging system. I also worked as a Product Owner: designing screens, receiving user feedback, prioritizing features, and determining what should be done and how. You can try the app to see more! Be sure to set your location to Paris to see the most content.

I completed a small freelance mission with Share Heritage. Working with their CTO, I completed various tasks.

Taiji Remote is a Bluetooth-enabled device that enables hands-free bike navigation through its companion app. As CTO, I developed the device, mobile application, and backend infrastructure over the course of a year. I designed a miniaturized PCB featuring an nRF52 SOM, 6 IO, battery circuit and USB power. I then implemented the firmware using nRF Connect SDK. For the mobile app, I chose Flutter to meet demanding animation performance requirements. The backend uses Node.js with OpenAPI, PostgreSQL with PostGIS for geospatial data, and weekly OpenStreetMap ingestion for up-to-date cartography. https://www.taijithedog.com

SPART is an enterprise app designed to boost employee wellbeing. It's a social platform where employees are grouped into teams that participate in sports competitions. As the Lead Full-stack developer, I built the complete application and backend infrastructure, maintaining it over three years. While the team occasionally included 2-3 developers, I remained the core technical contributor throughout the project. The platform serves hundreds of enterprises annually and thousands of users. I developed the mobile application using React Native. I conceived the backend infrastructure using Node.js, GraphQL, PostgreSQL and Google Cloud. The app features a feed curated by community managers, messaging, sport activities tracking, a leveling system (XP and levels).

66 Origin is a design and innovation studio. During my 4 years at 66 Origin, I worked with numerous clients, developing React Native applications and backend servers. I deployed websites, maintained apps and servers, managed client domain names, and handled various infrastructure tasks. Below are the main projects I contributed to during my time at 66 Origin. Lead Software Engineer on the SPART mobile application (react-native) and the SPART server (GraphQL w/ Node.js). 2021 - 2024 https://www.spart.life/ Software Engineer on the Quipo mobile application: I made some of the complex animations using react-native-reanimated. 2023 https://quipo-app.com/

Bugali, the interactive, screenless tablet! The player can interact with tactile books. In a team of an electronic engineer, a mechanical engineer and myself, we built the very first prototype of Bugali, over 10 months. The prototype successfully served its purpose for fundraising, after which the company continued development with a new team while I moved on to build and launch Weezem. I engineered a complete IOT stack: - I programmed an nRF52 chip using the nRF Connect SDK (the pre-ZephyrOS version available in 2019). - I built a Linux system on Raspberry Pi that connected via Bluetooth Low Energy using the Bluez API through DBUS. - I developed a custom 2D game engine in C++ that ran on the Raspberry Pi, featuring an embedded Lua scripting engine for creating mini-games.

I joined Yellow Innovation as a Full-stack Developer in 2018. I was assigned to the Monimalz Team which consisted of electronic engineers, mechanical engineers and 6 software developers (including me). Monimalz was a high-tech piggybank featuring a pixel screen that delivered playful educational content for children. It teaches one English word per day, it teaches money value and more. My role was to develop the user-facing software: the games, applications, and interactive content children would experience. I programmed primarily in Node.js for the main application running on embedded Linux, with other system components developed in C, C++, and Rust. Video presentation: https://www.youtube.com/watch?v=-UCSwe-Ks5A. Archived website: https://web.archive.org/web/20190915000000*/https://monimalz.com

Poleon is the AI-powered prediction and optimization API that feeds transportation operators the right data to allow them to meet and manage demand. We created an automated computing pipeline (A.I. as a Service) managed from an API and a dashboard. We were gathering cities datas (car traffic, subways, ...) from multiple APIs. We built an highly available and fault-tolerant infrastructure using the latest technologies: Docker, Node.js, Python, Cassandra, AWS.

We were prototyping a 3D mobile game using Unity3D (Android and ios). I developed CG/HLSL shaders and Unity3D plugins in C++ to pre-compute lighting (raytracing) in order to achieve an higher visual whith performance constraints. I also developed a 3DS Max plugin (Python) to export cinematics (animation + timeline) in a Unity-compatible format.