Anni Leontarakis
I’m a computer science and law student in Germany. Most of what I build is full-stack for web and mobile, so far with teams spread across Europe, the US, and South Korea.
About me
I’m a computer science and law student in Germany, and I’ve had the priviledge to work in very different work cultures. From early-stage startups, where one person carries a feature from the Figma file to the release, to large companies, where a small change has to pass review and integration, and then hold up for years.
During my time at start-ups in San Francisco and Seoul, I learned to get up to speed quickly, ask the question everyone likes to avoid, and leave behind code the next person can actually read. I like finding solutions to problems that are still loosely defined, where analysing what needs to be built is half the work.
Experience
Six years of software development, from early-stage startups to established automotive companies, with roles in Germany, the US, and South Korea.
February 2025 – Present
Ferchau Automotive GmbH (on behalf of BMW AG) · Munich, Germany
Develop web-based applications for managing and processing vehicle components and their data in React and TypeScript. Build modern frontend components and handle data integration and processing through GraphQL interfaces backed by MongoDB.
March 2024 – January 2025
LangCo AI Inc. · Seoul, South Korea
Owned product design and prototyping in Figma for a language-learning app powered by AI and LLMs. Delivered the full-stack implementation for Android and iOS in React Native and TypeScript, with Google Firebase and AWS on the backend, PubNub for real-time messaging, and the OpenAI API for the LLM features.
January 2024 – September 2024
Sforzato GmbH · Munich, Germany
Advised and supported international clients. Designed and implemented client websites using Figma, HTML5, CSS3, jQuery, and Squarespace. Handled social media management for Instagram, Facebook, and X, and produced content in Adobe Premiere Pro and Figma.
May 2021 – January 2024
Tonic Inc. · San Francisco, USA
Managed user data on the backend and built a web dashboard for analysing and visualising it with Next.js, TypeScript, and Google Firebase. Implemented app components for Android and iOS in React Native and TypeScript, backed by AWS and Google Firebase.
September 2022 – March 2023
Pharmakon Software GmbH · Karlsruhe, Germany
Created prototypes in Figma and implemented CRM software components for pharmaceutical companies using Angular, TypeScript, and PHP. Maintained the company website, built on Angular, TypeScript, and MS SQL Server.
What I work with
Most of my work sits between what a user touches and the data underneath it. These are the tools I reach for first.
Interfaces that stay fast and readable as the codebase grows.
Native and cross-platform apps, from first prototype to store release.
APIs, data models, and infrastructure the frontend can rely on.
Models and pipelines that turn raw input into a usable prediction.
Selected work
A mix of university work, client projects, and things I built because I wanted to use them myself. All of them taught me more than just vibe-coding.
Mobile CrossplatformPersonal project · July 2026 – Present
An EPUB reader with a custom layout engine. Pagination, navigation, and gestures run inside a WebView in TypeScript, bundled with esbuild. A typography system on top of css-tree lets reader settings override a book’s own CSS reversibly, and bookmarks, highlights, and notes are stored as content-based anchors. Library and book detail views, file imports, and settings are React Native, Expo, and SQLite.
With InterConnect GmbH & Co. KG, Karlsruhe · March 2023 – December 2023
Migrating a legacy PDF web editor into a modular, flexible suite. I built proofs of concept in Angular, ReactJS, and Vue.js and compared them on practicality, performance, and migration effort, then implemented the prototype in ReactJS from a Figma design. The backend was mine too: API design and implementation in Java Spring on MS SQL Server.
Mobile CrossplatformPersonal project · August 2025 – Present
Offline-first app for tracking book merchandise collections, with a shared collection card catalogue, personal wishlists, and photo uploads. Implemented it for Android and iOS in React Native, TypeScript, and Expo, with SQLite for local storage, Supabase on the backend, and a custom sync engine connecting the two.
Inha University, Incheon · September 2023 – January 2024
A dynamic network where clients exchange messages and files with no server in the middle. Built straight on Python’s socket library over TCP. No framework, so peer discovery, connection state, and message framing were all mine to get right.
Python CLI, WebInha University, Incheon · September 2024 – January 2025
A Raspberry Pi and camera setup that recognises what is in a fridge. YOLO11m does the detection, with PyTorch, scikit-learn, and pandas behind the analysis, and the processed results go into a database through a Django backend. Live monitoring runs on a ReactJS and TypeScript web interface.
Native AndroidPersonal project · November 2024 – May 2025
A native Android app in Kotlin. It generates its own puzzles, and a constraint-based solver sits behind the hint system, so hints come out of the current board rather than a stored answer.
Windows / LinuxPersonal project · June 2025 – March 2026
A cross-platform desktop tool in Python that sorts, renames, and tags large MKV collections in a single pass. It reads the container metadata and writes everything back in one run instead of file by file.
Frankfurt UAS, Frankfurt am Main · September 2021 – January 2022
Predicting product returns from the items in a customer’s basket. I implemented several algorithms and machine learning approaches and compared them side by side, all in Python with scikit-learn, NumPy, and Jupyter.
I’m open to internships, working student roles, and volunteer projects, and always up for a good technical conversation.
Send me an email