Charles Polart — Full Stack Developer

## 00 WHOAMI root identity

whoami --full

CP · 1995

Charles Polart

Full Stack Developer · Angular · Node · Flutter

· Freelance · 8 yrs · Remote OK · Born 02 Mar 1995 · EN fluent · 中文 basics

AVAILABLE — open to new contracts

charles.polart@hotmail.fr github.com/charlespolart linkedin

0 YRS

0 SHIPPED

∞ COFFEE

## 01 ABOUT about.txt

cat about.txt

Full stack developer with 8 years of experience building web and mobile (iOS & Android) applications. Specialized in Angular, Node.js and Flutter.

Expert in complex application architecture — from design to production. Comfortable owning a project end-to-end : backend, APIs, responsive UIs, mobile.

Currently freelance — recent missions for Agora Nova, SNCF, Leroy Merlin. Past defense / aerospace work in C++/Qt at Silicom (CEA, Airbus).

## 02 SKILLS skills.json

skills --list --json

front-end AngularReactAstroTypeScriptJavaScriptFlutterRiverpodDartTailwind CSSHTML5CSS3

back-end Node.jsBunHonoNestJSRESTGraphQLDrizzle ORMMicroservices

data & cloud PostgreSQLMySQLRedisAWS S3 / R2CloudflareFirebaseDocker

devops & tools GitCI/CDViteCaddyJestPlaywrightAgile/ScrumTDD

software dev C++C#QtWPF

## 03 EXPERIENCE experience.log

cat experience.log

Mobile App Publisher

2025 — now

Cross-platform mobile apps · built, published & monetized

Dian Dian · 点点 · Cross-platform year tracker — Flutter app (iOS / Android) + Express / TypeScript / Postgres backend, real-time WebSocket sync, JWT auth, Sign in with Apple / Google, RevenueCat in-app purchases, AdMob. Self-hosted (Docker, CI/CD).

Freelance Developer

2017.02 — now

Web · mobile · desktop · cross-stack · 8 yrs

Agora Nova · Political social network — Flutter mobile app + REST API for a public-debate platform : multi-role accounts, posts, polls, hashtags, moderation, RGPD-compliant FR hosting, CI/CD.
SNCF · DigiDoc+ — Front-end refactor of DigiDoc+, SNCF's internal platform delivering rail prescription texts (regulations, instructions, safety consignes) to every agent — successor to DigiDoc/Syspre. Angular / TypeScript / RxJS : faceted full-text search (Elasticsearch backend), classification-based navigation, identification cards, favorites, history. Agile collaboration with back-end and SARDO business teams.
Kiwidiag · Real-estate diagnostics marketplace — Marketplace booking certified surveyors for mandatory French property diagnostics (DPE, asbestos, lead, gas, electricity…). Backend work : Node, Koa, GraphQL, Sequelize, PostgreSQL — Stripe payments, Twilio SMS.
Leroy Merlin · Front-end integration — Front-end dev & integration on the Leroy Merlin site (Angular, Node.js).
Capa Interim · Matchmaking platform — Full backend for a temp-work site : ads search, account + CV upload, admin for ads / news / users (Symfony 3, PHP, MySQL).
Axion · NGO image platform — Thematic image-sharing site for a humanitarian NGO : publishing, categorisation, moderation (Symfony 3, PHP, MySQL).
ConsolWeb · Wiring software — Desktop app opening multi-format wiring schematics : layer viewer + ordered technician guidance (C#, WPF).
Revue scientifique · PDF extractor — Desktop tool for automated structured-data extraction from scientific PDFs (C++, Qt).

C++/Qt Developer @ Silicom

2020.12 — 2023.05

Defense & aerospace mission · 2 yrs 6 mo

CEA · Workspace — Dev & integration of new features in a seismic / infrasound / hydroacoustic signal analysis tool used for nuclear monitoring.
CEA · Ceres TMA — Maintenance on a tool evaluating health impact of pollutant releases into the environment.
CEA · Diva TMA — Monitoring & display of seismic network station data over time.
Airbus D&S · Magellan — Features for a secure communication software operating over wireless networks.

Engineering Internships @ Thales · Dassault · R&D Tech

2016 — 2020

3 internships · C++ · C# · Qt · Python

Thales · La Ruche · 2020.03 — 2020.08 · 6 mo — Aerial drone detection software in Unity + radar simulator (C#, C).
Sogitec / Dassault · 2017.04 — 2017.08 · 5 mo — Hybrid raytracing / rasterization rendering system for flight simulation (C++).
R&D Tech France · 2016.09 — 2017.03 · 7 mo — Embedded C/C++ R&D : laser control over network, drone parachute trigger, robot arm stabilization.

## 04 PROJECTS ~/projects/

ls -la projects/ && cat *.md

▸ FEATURED WORK

cat agora-nova.md

[01] Agora Nova

Flutter · Bun · Dart · TS/JS · Freelance · political social network

Public-debate platform for citizens, journalists and public figures. Flutter mobile app + Bun-powered REST API. Multi-role accounts with verification, feeds, posts, reactions, polls, hashtags and moderation. RGPD-compliant FR hosting, CI/CD pipeline.

Multi-role identity with account verification
Posts, polls, reactions, comments, hashtags
Moderation tools + role-based access
CI/CD deploy on RGPD-compliant FR infrastructure

cat sncf.md

[02] SNCF · DigiDoc+

Angular · TypeScript · RxJS · Elasticsearch · Freelance · enterprise · regulatory texts

Front-end refactor of DigiDoc+, SNCF's internal documentary platform delivering rail prescription texts (regulations, instructions, safety & operation consignes) to every agent on the network — successor to DigiDoc / Syspre. Daily-use tool : the right text, in the right version, to the right agent. Angular / TypeScript / RxJS, faceted full-text search backed by Elasticsearch. Agile collaboration with back-end and SARDO business teams.

Faceted full-text search across the regulatory corpus (Elasticsearch)
Navigation by themes, business activities, document types, regions
Documents + modules (sub-parts of text) — versions, variants, abrogations
Identification cards, favorites, history, parution alerts

cat kiwidiag.md

[03] Kiwidiag

Node · Koa · GraphQL · Sequelize · Postgres · Angular · Freelance · marketplace

Marketplace booking certified surveyors for the mandatory French property diagnostics (DPE, asbestos, lead, gas, electricity…). Multi-role accounts (customer / diagnostician / partner), planning, geolocation, Stripe payments and reviews.

Multi-role accounts : customer · diagnostician · partner
Catalog of mandatory FR diagnostics (DPE, asbestos, lead, gas…)
Surveyor availability + booking flow with geolocation
Stripe payments, Twilio SMS verification, reviews

kiwidiag.com

cat workspace.md

[04] Workspace / Diva / Ceres

C++ · Qt · CEA · Silicom

Three desktop tools used by CEA researchers for nuclear monitoring and environmental impact assessment. New features + integration on all three.

Workspace : seismic / infrasound / hydroacoustic signal analysis
Diva : time-series monitoring of seismic-network stations
Ceres : health impact assessment of pollutant releases into the environment

cat magellan.md

[05] Magellan

C++ · Qt · Airbus Defence · Silicom

Secure communication software over hostile wireless networks. Hard-real-time constraints, defense-grade requirements.

cat consolweb.md

[06] ConsolWeb · Wiring Tool

C# · WPF · Freelance

Desktop app that opens multi-format wiring schematics. Layered PCB viewer guiding technicians point-by-point in the optimal wiring order.

cat capa.md

[07] Capa Interim

Symfony 3 · PHP · MySQL · Freelance

Backend for a temp-work matchmaking site : job search, account + CV upload, full admin for ads / news / users.

capainterim.com

cat axion.md

[08] Axion

Symfony 3 · PHP · MySQL · Freelance · NGO

Thematic image-sharing site for a humanitarian NGO. Content publishing, discovery feed and community interactions (likes, comments).

▸ APPS

cat dian-dian.md

[09] Dian Dian · 点点

Flutter · Dart · Express · TypeScript · Postgres · WebSocket · Indie product · stores · 2025

Cross-platform visual year tracker : color-code each day of the year on a 12-month × 31-day grid, with a pixel-art, cozy-book aesthetic. End-to-end build — Flutter client (iOS / Android), Express + TypeScript + Postgres backend, real-time WebSocket sync across devices. JWT auth with refresh rotation, Sign in with Apple / Google, RevenueCat in-app purchases. Self-hosted on a single VPS via Docker Compose + Caddy, shipped through GitHub Actions → GHCR.

Year grid : 12 months × 31 days, pastel + custom colors, drag-reorder legends, quick-fill
Real-time WebSocket sync across devices, multi-year trackers, PNG export, 7 themes + dark mode
Stats : days filled, best streak, yearly %, distribution, monthly + day-of-week breakdown
Premium : RevenueCat (monthly / yearly / lifetime + trial), custom pixel-art paywall, AdMob

App Store diandian.overridedev.com

▸ PERSONAL PROJECTS

cat algo-trading.md

[10] Algo Trading Platform

Bun · TypeScript · Hono · React · Postgres · Docker · Personal · 2025—2026

Crypto algorithmic trading platform (spot + USDT-M futures) : execution and market data through exchange APIs. Strategies written in TypeScript run identically in backtest, paper and live — high-fidelity backtester, walk-forward optimizer and live bots with risk guards.

TypeScript-native strategies — identical code in backtest / paper / live, no lookahead by construction
High-fidelity backtester : candle or replayed aggTrades, fees / slippage / funding, walk-forward optimizer
Live / paper / testnet bots : virtual allocation, risk guards, kill switch, Telegram alerts
Self-hosted on VPS : Docker, Caddy (auto-TLS + mTLS), CI/CD to GHCR

cat pathtracing.md

[11] Path Tracing Engine

C++ · Qt · OpenGL · STL · Personal · 2019—2022

Photorealistic 3D rendering engine built from scratch — STL only, FreeImage for textures, OpenGL for preview.