# Charles Bryan Fabian

> Software Engineer in Metro Manila building payment platforms, wallet integrations and enterprise back-office systems with C#/.NET, TypeScript, Next.js and NestJS.

Portfolio: [https://portfolio.cbrf2002.workers.dev](https://portfolio.cbrf2002.workers.dev/)

A Software Engineer from Philippines building payment platforms and back-office systems in .NET Next.js — plus Mobile and IoT work that reaches real hardware.

## Highlights

- Top 20 /178: AppCon 2024 teams — AgroSphere
- 390+: Feature & fix PRs merged in 2026
- 2,083: GitHub contributions in the last year
- 21 repos: Shipped into, across 4 orgs

## Experience

### Full Stack Developer / Software Engineer — DFNN Inc.
Feb 2026 — Present · Full-time · Taguig, PH
- Developed multi-brand back-office and gaming/wallet integrations using Next.js, NestJS, TypeScript and PostgreSQL; delivered brand-scoped RBAC, JWT/session controls, transaction reporting, API security and SQL query optimisation.
- Co-developed a provider-agnostic payment gateway with ASP.NET Core/.NET, Next.js, PostgreSQL and Redis, covering merchant onboarding, isolated accounts, API keys, QR/e-wallet collections and hosted checkout.
- Implemented verified payment notifications, replay protection, idempotent financial posting, signed webhooks and ledger-based reconciliation; built a .NET/Next.js test harness covering 16 provider API operations and supported Docker/AWS EC2 deployments.
- Built permanent lottery draw-result pages, daily/monthly archives and search-friendly redirects for LottoMatik; generated 35 monthly XML sitemaps covering approximately 9,600 result URLs.
- Developed province/city agent-locator pages and improved draw-result ingestion with persistent scheduled jobs, three-day catch-up and backfill; strengthened CSP, input sanitisation, image performance and responsive UI.
Stack: ASP.NET, Next.js, NestJS, Python, PostgreSQL, Redis, AWS, Huawei Cloud, Cloudflare

### Junior Software Engineer — Sage Business Solutions Inc.
Sep 2026 — Present · Contract · Remote
- ASP.NET/C# backend for a regulated public-sector financial asset distribution platform — admin RBAC, role/capability queries and optimistic concurrency.
- Asset management, cash funding/settlement and checkbook issuance workflows, plus PDF generation and evidence integration.
- Mapped requirements to Jira stories and acceptance tests; unit, integration and Docker-backed tests.
Stack: C#, ASP.NET, Microsoft Entra, SQL Server, Docker

### Full Stack Developer — Sage Business Solutions Inc.
Jan 2026 — Aug 2026 · Contract · Remote
- Enterprise financial-services apps with ASP.NET/C#, React/Vite, SQL Server and REST APIs, including claims and admin workflows.
Stack: C#, React, Vite, SQL Server

### Full Stack & Embedded Engineer — Freelance
Aug 2025 — Oct 2026 · Project-based · Cavite, PH
- End-to-end web/mobile systems in Next.js, React Native, Node.js, Flask and PostgreSQL — APIs, auth, schemas and cloud sync.
- Firmware for Arduino, STM32 and ESP-based devices: sensor telemetry, device-to-cloud interfaces and PCB prototypes.
Stack: Next.js, React Native, Flask, STM32, ESP32

### Full Stack Mobile & Web Engineer — iEminence Inc.
Mar 2025 — Jun 2025 · Internship · Makati, PH
- Migrated an HR information system from React to Flutter across 30+ modules; refactored a property-management app with Bloc, 1,400+ tracked fixes.
- Dockerised Node.js services, Firebase realtime chat and an Azure Face API biometric attendance prototype.
Stack: Flutter, Bloc, Node.js, Azure

## Projects

- [Inventor.io](https://inventorio.cbrf2002.workers.dev/): React/Vite + TypeScript inventory suite on Convex and Cloudflare Workers — real-time stock movement, multi-user sync and responsive admin dashboards. Stack: TypeScript, Vite, Cloudflare Workers, Convex, React.
- **AgroSphere**: IoT greenhouse system: ESP32 telemetry into Firebase with Kotlin/Jetpack Compose Android controls, offline persistence, sync recovery and low-latency updates. Stack: Kotlin, Jetpack Compose, C++, ESP32, Firebase.
- **JuanFile**: Mobile application for an HRIS management system, with Firebase realtime chat and an Azure Face API biometric attendance prototype. Stack: Flutter, NodeJS, REST API, MSSQL, Firebase, Azure Face API.
- **Fundi**: Flutter/Firebase personal finance app with secure sign-in, expense tracking, Firestore sync and Cloud Functions. Stack: Flutter, Firebase, Cloud Functions.

## Skills

- Core: C#, ASP.NET Core/.NET, TypeScript, JavaScript, React, Next.js, Vite, Node.js, NestJS, Python (Flask), REST APIs
- Data & security: PostgreSQL, SQL Server, Redis, Prisma, JWT/RBAC, HMAC, Cryptographic verification, API integrations
- Cloud & delivery: AWS EC2, Docker/Compose, GitHub Actions, Cloudflare Workers/D1, Nginx, Azure, Firebase
- Mobile & embedded: Flutter, React Native, Kotlin, Java, C++, Arduino, STM32, ESP32
- Also comfortable with: Internet of Things, Computer Networking, Machine Learning, Data Science, Tailwind CSS, SQL
- Digital media: UI/UX Design, Graphic Design, 3D Modelling/Rendering, Event & Portrait Photography, Figma, Adobe Suite

## Education

- BS Computer Engineering, National University Dasmariñas (2022–2025)

## Certifications & awards

- Certiport IT Specialist — Software Development
- Certiport IT Specialist — Networking
- Apple App Development with Swift
- AppCon 2024 Top 20 Finalist
- Certiport exam — First Overall
- Dean's Lister, 3 terms

## About

I'm a Software Engineer with a Computer Engineering degree. These days I build payment platforms, wallet integrations and enterprise back-office systems.

Most of my work is in C#/.NET, TypeScript, Next.js and NestJS on PostgreSQL and SQL Server, shipped with Docker and GitHub Actions to AWS and Cloudflare. I like the parts of a system where correctness matters: RBAC, signed webhooks, idempotent posting, ledger reconciliation, and security.

Before becoming a web developer, I came from hardware. I've written firmware for ESP32, STM32 and Arduino, built IoT dashboards, and mobile apps.

## Links

- [Portfolio](https://portfolio.cbrf2002.workers.dev/)
- [LinkedIn](https://www.linkedin.com/in/cbrf2002)
- [GitHub](https://github.com/cbrf2002)
- [Facebook](https://facebook.com/cbrf2002page)
- [Instagram](https://instagram.com/cbrf2002)