Hello!  

👋

I'm James Casia, a solutions alchemist adept at transmuting raw ideas into real, functional products.

Get in touch -> jamescasia99@gmail.com
BACKGROUND

Software Engineer bridging backend / serverless architecture and AI / agentic engineering. Proven track record of architecting resilient cloud infrastructure and shipping products at scale, reaching millions of users in fintech and digital assets.

Currently freelancing as an Agentic & AI Engineer — building production-ready multi-agent systems on LangGraph with human-in-the-loop orchestration, offline-first RAG pipelines with hybrid retrieval, and cross-platform desktop apps with on-device LLMs.

At Reap, I built distributed backend systems supporting critical business processes — system integrations and internal platforms that enhanced scalability, resilience, and operational efficiency.

Previously, I spearheaded the frontend launch of GCrypto, a cryptocurrency trading feature within GCash, leading its growth from zero to over 1 million users.

Beyond core engineering, I am a co-founder and Team Lead of Fliptoons, a web-comic platform, and a long-time contributor to the Machine Learning community. I have published research on voice replication training and won multiple international DS/ML competitions.

EXPERIENCES
Agentic & AI Engineer
March 2026 - Present

Freelance
Remote

  • Architected production-ready multi-agent systems on LangGraph (Planner / Researcher / Coder / Reviewer / Submitter patterns) with human-in-the-loop approval gates between stages.
  • Built privacy-first offline RAG pipelines: chunking, embedding, FTS5 + sqlite-vec hybrid retrieval (RRF-fused), entity-aware pre-filtering, and intent-routing between SQL and streaming local LLMs via Ollama.

Software Engineer
April 2025 - March 2026

REAP
Hong Kong, Remote

  • Designed and implemented an automation for business onboarding workflows and application status tracking. Led the project, developed the API, frontend and third party integrations.
  • Built and maintained internal tools to streamline operational and compliance workflows across teams.
  • Utilized GPT-based coders to assist in the code writing and review process while implementing Test Driven Development to ensure code quality and reduce development time by ~30%.

Software Engineer (GCrypto)
May 2022 - February 2025

Philippine Digital Assets Exchange (PDAX)
Taguig, NCR, Philippines

  • Built and launched the frontend of GCrypto, a crypto trading mini-app on GCash, scaling from 0 to over 1 million users.
  • Integrated multiple APIs to deliver a secure and seamless crypto trading experience.
  • Developed and maintained internal web portals for managing clients, users, and operational workflows.

Software Engineer & Team Lead
June 2021 - December 2021

Fliptoons
Cebu, Philippines

  • Fliptoons is a web comic platform that also hosts web comic competitions. It is funded by Grant For The Web
  • I designed and built the frontend of the site and managed to get 1000 users with 400+ monthly visits.
  • I planned, oversaw the whole project and worked with a 3-person team in a fully remote setting.

Machine Learning Practitioner & Writer
Jan 2020 – Present

  • Develop and maintain a blog where I talk about ML (Machine Learning) including theory, implementation of DL (Deep Learning) techniques, GANs, and deploying ML models on the cloud.
  • Devised and studied a technique to make Voice Replication training faster as a thesis project with the use of Tacotron and a novel voice encoder loss.
  • Partook specializations on Machine Learning, Deep Learning, NLP, and GANs. Joined and won ML/DS competitions.

Software Developer Intern
July 2021 – August 2021

Symph
Cebu, Philippines

  • Updated and re-designed the production sites of one of the company’s clients. HTML, CSS, Gatsbyjs
  • Designed and contributed to developing a code snippet storage app and developed the CRUD with Firebase.

Mobile Developer
January 2020 - December 2020

Freelance
Cebu, Philippines

  • Worked with clients in implementing their ideas to real apps with Flutter.
  • Built Mansana, a full-fledged productivity app with collaboration features, and pomodoro!
  • Also joined and won multiple hackathons and software development competitions as a mobile developer.
PROJECTS
AkShoot.ly - Climbing Photography Platform
   Visit

Built and shipped an end-to-end climbing photography platform with photographer onboarding, watermarked uploads, programmatic share images, and templated email automation. Designed full stack solo; accelerated delivery with Claude Code agentic workflows.

Next.js
TypeScript
Supabase
Cloudflare R2
Maileroo
Picnic Panic!
   Visit    View

Designed and developed a mobile game with in-game currency, cosmetic items, mini-games and boosters. Game was built for Android Masters, a national game development competition and became Grand Champion. Uploaded on Google Play Store and acquired over 400 downloads and acquired 4.8 stars with 30 reviews use bootstrap javascript components in React JS.

Cocos Creator
Cocos 2d
Javascript
Hachingu - Learn To Read & Write Korean
   Visit     Code

Designed and developed an educational app with Korean lessons, quizzes, tips, and a writing trainer. Created a trained a CNN model for the writing trainer of the app and deployed to mobile using tensorflow-lite

Flutter
Tensorflow
Keras
Mansana - Be Productive
   Visit    Code

Mansana is a gamified productivity app with collaboration, pomodoro timers, achievements, productivity tips and more! I made this app for a freelance client.

Flutter
Firebase
Text-to-Speech Synthesis
   PDF    Samples

Explore a novel method for text-to-speech synthesis through Tacotron using only a few audio samples! Use this method to get audio output as similar and as natural as human speech.

Tacotron
Artificial Intelligence
Text to Speech
SalesCast
   Visit    Code

Upload your sales data and automatically perform forecasting with Holt Winters Method and ARIMA. Tweak parameters to create the most effective model!

Python
Pandas
SKLearn
HakkTaxi - Predict Travel Time
   Visit    Code

Designed and developed the app with travel time prediction, azure maps integration and data visualization. Contributed and used machine learning techniques to predict travel time using GrabPosisi dataset. Formed a diverse team from SEA and emerged as champions for Microsoft Azure Hackathon 2020

Python
Numpy
XGBoost
Flutter
SKLearn
Tilted Tables
   Visit    Code

Tilted Tables is a fun and cute 3d puzzle game. It implements web monetization through coil which allows the user to unlock powerups. This game was built in 6 days for the Web Monetization hackathon.

Godot
GDScript
Papyrus - Expense Tracking App
   Visit    Code

Designed and built an expense tracking app with visualizations, receipt scanner, chatbot, and store promotions App integrates with store inventory management webapp and implements TaggunAPI, an OCR service tuned for scanning receipts. App is published on the Play Store and uses Firebase for user data storage. App was built for Program The Future Hackathon 2019 and emerged as Grand Finalist

Flutter
TagGun
Firebase
Mentallerts - Track Emotions From Tweets
   Visit    Code

Designed and built an app that lets you track your friends tweets and their sentiments Azure NLP Sentiment Analysis was used to predict the emotion of a person based on tweets. App was built for Alliance Azure Hackathon and won second place.

Flutter
Azure
Escape Velocity
   Visit    Code

Test your timing and patience in this crazy, beautiful, nerve-wracking hypercasual game.

Cocos Creators
Cocos 2d
Javascript
Plantstagram
   Visit    Code

Planstagram is your Instagram for plants! Post cute pics of your plants and share it with everyone. It also serves as a marketplace for greens and produce.

Flutter
Firebase
Google Maps
ResNET50 API
   Visit    Code    Blog

The project is an API designed for the ResNet50 CNN, which incorporates residual networks and consists of 50 layers. It is capable of classifying a maximum of 1000 objects and uses the ImageNet 1k dataset. Walk through the nitty-gritty of this ongoing project by heading over to my blog.

AWS
Flask
Pytorch
Deep Learning
Awards
Grant For The Web Grant Awardee (2021)
Mozilla & Interledger Foundation
Received 27,000 USD in funding to develop and run Fliptoons.ph.
Microsoft Azure Data Science Hackathon Champion (2020)
Microsoft Azure & Grab Taxi
Emerged as champions for this international competition in the APAC region. Teamed up with people from Sri Lanka, Indonesia, and Malaysia.
Android Masters Champion (2018)
Google Developer Groups & Eclaro PH
Created and submitted multiple games as a first year college student and managed to become champions of this national competition in the Philippines.
Program The Future Grand Finalist (2019)
Accenture
PTF is the most prestigious and high stakes hackathon and pitching competition in the Philippines. As first years, we created and pitched Papyrus and managed to become one of the grand finalists.
Alliance SteamCup Hackathon 1st Runner Up (2019)
Alliance Software
Created mentallerts and won first runner up. Competed with local colleges in Cebu City.
React Cebu Hackathon 3rd Place (2019)
React Cebu
Created and pitched a crowd-sourced fire reporting app

Let's work together!

I'm offering Feature design, UI/UX design, Fullstack App development and Machine Learning/AI services.


Hire me!
SKILLS
languages

Dart

Python

Javascript

Java

frameworks

Flutter

Vue JS

React JS

Tailwind

BootStrap

tools

Git

VS Code

Postman

Adobe Illustrator

Figma