Charles Nathaniel Togle builds practical software with measurable impact.

An offline-first personal finance management app for Filipino working young adults. Built around local SQLite reads and writes so transaction entry, balances, budgets, savings goals, and debt management stay useful when connectivity drops, then converges through a cursor-based sync engine with queued domain operations, idempotent push, tombstones, IBM-backed delete-wins conflict resolution, and per-field last-write-wins for concurrent edits. Security is enforced through user-scoped RLS, explicit sync allowlists, ownership validation, and Postgres RPCs for sensitive operations. Recurring transaction templates generate queued ledger entries automatically, while the backend is planned for Google Cloud Run and local development uses Tailscale for private remote access.

A multi-tenant car-rental SaaS built for Katada Van Rentals, replacing a 1,000-peso monthly fee for the previous platform with a purpose-built system. Managed weekly client communication and delivered the full customer journey from fleet discovery and account onboarding to route-aware booking, payment receipt submission, and booking status updates. Matched toll plazas against the returned route polyline using an owned Philippine toll dataset to produce accurate estimates that still fit the customer's budget. Added meaningful KPI dashboards, financial reports, and CSV exports that gave the client a clearer view of the business, capabilities missing from the previous car-rental platform.

A pair-programmed barangay disaster assessment platform built for the eGovPH ecosystem. Served as Technical Lead, planning the team's feasible scope and coordinating delivery within eight hours of development time. My delivered work focused on the Assessment Builder for creating structured disaster campaigns, real-time dashboard and user-dashboard updates through the realtime/WebSocket layer, and a planned AWS-native production architecture covering load balancing, managed database infrastructure, secrets, encryption, and observability. The project was selected as a Top 10 hackathon finalist.

A multi-tenant Physical Education platform built with a team of five to bring lectures, quizzes, workouts, health tools, fitness testing, and class tracking into one system. Led the full-stack delivery across React, PostgreSQL, and Supabase, including role-based student and teacher experiences, lecture progress that controls quiz access, resumable timed quizzes with scoring and leaderboards, and session-based pre-test and post-test recording that automates Physical Fitness Test classification. The teacher dashboard supports class-code management, performance review, and spreadsheet export for reporting.

A unified lost and found platform for web and mobile, delivered with a team of four to replace fragmented reporting with one searchable system for the University of Makati community. Built the Ionic React and Capacitor mobile client, a Next.js staff and admin portal, and a Fastify backend-for-frontend that centralizes authentication, role enforcement, posts, claims, fraud reports, notifications, storage, and audit logging. Integrated Gemini image classification to extract item metadata and generate search queries, then combined PostgreSQL full-text and similarity search to match lost and found reports. The backend was dockerized and deployed for Google Cloud Run, with Firebase push notifications and Resend email completing the operational workflow.

A practical setup guide for turning an Android phone into a self-hosted local LLM server. Documents the full path from installing Termux and configuring SSH to running TinyLlama through Ollama and exposing the inference endpoint across a trusted local network. The project makes an overlooked piece of hardware useful as a private, low-cost AI development environment that can be reached from a laptop without relying on a hosted API.

A lightweight, browser-first learning platform that turns raw study material into repeatable practice sessions. Its AI-assisted JSON workflow lets users generate and load custom quizzes through file upload or direct paste, while a single unified engine supports multiple-choice, abbreviation, and identification questions with answer normalization, live progress tracking, instant scoring, correction feedback, shuffle-based retakes, and targeted retries for missed questions. Built as a zero-backend study tool, it helped 40+ classmates review course material more actively and contributed to a higher class passing rate.

An interactive digital communications laboratory that makes abstract line-coding theory visible, inspectable, and easy to compare. The React/Vite application transforms every input character into an 8-bit ASCII stream and renders per-bit pulse patterns for NRZ, RZ, Manchester, Binary AMI, and CMI encoding, complete with voltage levels, timing transitions, character boundaries, binary and ASCII reference views, and encoding-specific explanations. Students can tune grid size, spacing, labels, connectors, markers, and animation, follow a guided tutorial, and export polished PNG or SVG diagrams for assignments and reports. Automated networking coursework for 50+ students while turning a typically manual exercise into an immediate visual learning experience.

A security research data pipeline that continuously harvests phishing URLs from OpenPhish and PhishTank instead of relying on a one-off scrape. The Node.js scrapers poll feeds, paginate through large datasets, measure response behavior, resolve domains for GeoIP enrichment, inspect Cloudflare headers and hreflang metadata for country classification, and write structured append-only NDJSON records for downstream analysis. PhishTank results also produce a valid-only subset, while checkpoint files and graceful shutdown handling make long-running collection jobs resumable and operationally reliable.

A 65-slide animated curriculum and presentation designed to move an entire third-year Computer Science cohort beyond copy-pasting AI output and toward deliberate agentic software engineering. Built as a programmatic React and Remotion deck, it covers the industry shift toward coding agents, agent fundamentals, tool comparisons, practical workflows, standards and CLAUDE.md customization, vibe coding versus vibe engineering, system design for agents, reusable skills, and a live coding demonstration. The presentation was itself built through the workflow it teaches, turning the deck into both an instructional resource and a working case study in AI-assisted software development. Presented to the full cohort and helped motivate the professor to consider agentic coding for future underclass curriculum.

A private self-hosted file server and its deployment layer. HomeServer Lite combines a React file-management interface with a Fastify API, authenticated sessions, nested folders, batched and idempotent uploads, file previews/downloads, search and type filtering, storage usage, favorites, and trash recovery backed by a durable SQLite database. The repository also includes a PostgreSQL schema for the planned database architecture. NginxConf supplies the operational front door: nginx hostname and path routing, private BIND DNS for the home zone, Tailscale Split DNS and Funnel integration, UFW rules limited to the tailnet interface, and a deployment script that validates and reloads the web and DNS configuration.