Roman Cirier

Freelance full stack developer working on various projects, including Journey, Bloomflow, Mayoo, Snoop, Kivid, and Class8.

Led development and launch of the app to 120k monthly active users, owning feature design and prioritization. Re-architected real-time voice channels from P2P mesh to SFU topology, lifting stable room size past previous ceiling.

Worked on multiple web and mobile projects, building trading tools, task management, and e-commerce platforms. Developed manual trading and real-time market sync for a crypto app, implemented a Node.js-based notification system, and designed an e-commerce app with React, Strapi, and Stripe.

Developed a semantic property search system integrating Vertex AI and Google Places API for intelligent autocomplete suggestions. Built a comprehensive search API with multi-dimensional filtering, optimizing Redis and cross-service calls for low latency.

Rebuilt the mobile app from the ground up, migrating to TypeScript with clean architecture and cutting cold-load time to near-instant. Developed an AI assistant agent with conversational chat, voice capture, and entity disambiguation flows.

Developed the driver vehicle inspection report (DVIR) feature end-to-end, including API design, CRUD operations, PDF generation, and offline support. Implemented workflows in React Native and Next.js apps and established error tracking with Datadog.

Independently designed and built a three-surface platform: NestJS microservices API on PostgreSQL, React web app, and React Native mobile app, all in TypeScript. Owned architecture, automated deployment with GitHub Actions, and built staff and student apps.

Sole engineer on a platform for physiotherapists, designing architecture and building a NestJS/GraphQL API plus mobile app. Owned data modeling, cloud infrastructure, and deployment pipelines end-to-end.

Developed new features for React Native mobile app including real-time messaging and a Netflix-style discovery screen. Optimized rendering from 40fps to stable 60fps and enhanced caching to reduce loading times.

Master of Software Engineering degree from Beijing Jiaotong University, completed as part of a dual-degree program with EPITECH.

Master of Computer Science degree from EPITECH, Paris, completed as part of a dual-degree program with Beijing Jiaotong University.