Arcade J
MamangunSenior AI Systems Architect & Automation Engineering Lead
- Voice & SMS AI agents (Retell, VAPI) — 1,000+ calls/day
- AI automation architecture (n8n, Make, GHL) — 85% less manual ops
- RAG systems, ML pipelines & FastAPI backends
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Systems architect who ships and owns the outcome
I'm a Senior AI Systems Architect and Technical Operations Lead with 12+ years of experience, scaling from a junior Python developer to a technical leader who owns systems end to end. I hold a B.S. in Mathematics and Computer Science from UC Berkeley, and I think at the architecture level — designing before building and measuring everything.
Most recently, I spent ~3.5 years at Merged Media (Ontario, Canada) leading a 4-person engineering team. There I architected voice + SMS AI pipelines processing 1,000+ calls a day, built an n8n-first automation layer that cut manual operations by 85%, and shipped AI infrastructure serving 50,000+ monthly users — reducing operational cost by 60%+ and response time from 4 hours to under 2 minutes.
I treat every system like my name is on it: redundancy, monitoring, dead-letter queues, and alerting by default. Claude Code and Cursor are daily tools in my AI-native workflow, and I'm equally comfortable owning the RAG pipeline, the FastAPI backend, the CRM orchestration, and the roadmap.
Core Capabilities
12+ years · from Python developer to AI systems architect & technical operations lead.
UC Berkeley — Math & CS
Angeles City, PH
Remote, worldwide
Voice AI · Automation · ML
A blueprint, then a system that runs itself
I operate as a solution architect, not a task-based implementer — delivering bulletproof systems that keep running long after hand-off.
Architecture & System Design
I map your process end to end, model the dependencies, and expose every failure path before a single node is built. You get a blueprint, not a guess.
Automation Engineering
n8n, Make, and GHL flows engineered with retries, idempotency, and observability — control panels that run lights-out and never silently drop data.
AI & ML Engineering
LLM agents, RAG pipelines, and predictive models tuned for the real trade-off: accuracy vs. latency vs. cost. Grounded, cited, and production-ready.
Backend & Integrations
FastAPI microservices, event-driven workers, and multi-platform webhooks that hold everything together at scale — 99.9% uptime, not demo-ware.
Delivery & Ownership
I operate as your technical partner: clear rationale, real-time updates, and monitoring + alerting baked in so the system keeps running long after hand-off.
What I build for automation-first teams
End-to-end systems you can trust — designed, engineered, and monitored like they're mission-critical, because they are.
AI Automation Systems
Design and deploy resilient automations that eliminate manual work across revenue, operations, and support.
- End-to-end lead generation, enrichment, and nurture pipelines
- LinkedIn, email, and omnichannel outreach systems with human-quality AI responses
- Voice receptionists, call routing, and follow-up automations
- CRM orchestration across HubSpot, GoHighLevel, and custom data sources
- Document intelligence: PDF intake, extraction, and downstream workflows
- Alerting, approvals, onboarding, and billing automations
AI Agents & Conversational Systems
Deploy voice, chat, and task agents that reason over your knowledge base and trigger business workflows.
- Voice agents for inbound and outbound calling
- WhatsApp, Telegram, and web chat assistants with multi-step reasoning
- Internal knowledge copilots powered by Notion/Drive content
- Appointment scheduling agents integrated with calendars and CRMs
- Task automation agents for ClickUp, Notion, Asana, and Todoist
AI/ML Engineering
Build predictive, NLP, and computer vision systems with robust data pipelines and deployment practices.
- Time-series forecasting for finance, trading, and demand planning
- Sports analytics and betting edge models
- NLP pipelines for classification, search, tagging, and summarization
- Computer vision workflows for quality inspection and media processing
- ETL → train → deploy → monitor pipelines with automated retraining
Backend Engineering
Ship the infrastructure that keeps automations and AI models stable, observable, and scalable.
- FastAPI and Python microservices with secure REST and webhook layers
- Supabase, PostgreSQL, Redis, and Google Sheets data orchestration
- Event-driven workers, schedulers, and queue-based automations
- Dashboarding and monitoring for every critical workflow
History & Projects
AI automation first, AI/ML engineering always.
A snapshot of production workflows and machine learning systems that delivered measurable outcomes.
Featured Work
Live platforms I architected and built.
SpecDoors AI
Architected & built end to end
AI compliance and estimating tool for construction. PDF ingestion, semantic chunking, FAISS vector store, and Claude retrieval with citation enforcement to prevent hallucination on compliance-critical content.
ReviewRevolution AI
Architected the automation & AI response pipeline
AI reputation-management platform for hospitality and service businesses — automated review capture, AI response generation, negative-feedback handling, and multi-platform monitoring.
Rentalizer.ai
Full-stack, solo build
AI property-acquisition platform with a CRM deal pipeline, AI market analysis, and automated outreach sequences. Built solo end to end.
Frequency Digital Group
Technical architect
AI agency platform delivering AI live agents, automations, and web services for clients.
AI Automation Projects
AI Voice/SMS Agent Setup for Agency
Featured Automation
Inbound/outbound voice callers built on Retell AI, GHL, n8n, and VAPI — checking calendar availability, booking appointments, and notifying the team. Processed 1,000+ calls a day.
1,000+ daily calls, 45% better lead-qualification accuracy, 99.9% uptime.
Off-Hours Lead Response System
Featured Automation
GoHighLevel + n8n workflow that detects after-hours leads and instantly fires voicemail, SMS, and email follow-ups, logs to Google Sheets, and sends a morning Slack digest.
Response time cut from 4 hours to under 2 minutes; zero after-hours leads dropped.
LinkedIn Engagement Automation
Featured Automation
Monitors comments in real time, drafts GPT responses, sends targeted DMs, and syncs everything to the CRM.
60% engagement lift and 10+ hours reclaimed every week.
LinkedIn Job Application AI Assistant
Featured Automation
Scrapes roles, ranks relevance with AI scoring, drafts personalized outreach, and manages the entire pipeline.
Delivered daily shortlists and doubled reply rates for job-seeking campaigns.
Real Estate Voice Calling Agent
Featured Automation
Voice AI handles inbound and outbound calls, qualifies leads, books appointments, and updates pipeline stages.
10× outreach capacity with zero missed leads.
Instagram Story Generator
Featured Automation
Detects upcoming events, generates GPT copy plus branded imagery, and auto-publishes to Instagram.
Removed 80% of manual social workload for franchise teams.
AI/ML Projects
AI Powered Door Pricing Estimation Engine
Machine Learning
Estimate thousands of doors price based on door schedule, frame schedule, price list digseting dense tabular PDF files.
Stock Movement Forecasting
Machine Learning
Feature-engineered pipelines predicting short-term stock momentum with automated daily retraining.
Altcoin Downturn Signal
Machine Learning
Custom crypto index using whale metrics, order books, and BTC correlations to flag downturn windows.
NBA & MLB Game Predictions
Machine Learning
Player-level performance models, opponent adjustments, and betting edge dashboards for sports investors.
Water Intelligence Monitoring
Machine Learning
Geospatial ML system detecting flood anomalies and coastal risk patterns using satellite imagery.
AI Video Intelligence Platform
Machine Learning
Transcribes content with Whisper, builds GPT summaries, key moments, and quiz generation for long-form media.
WorkFlow Gallary
A glimpse of recent automation infrastructure. From n8n and Make.com orchestrations to GoHighLevel revenue flows — every workflow ships with monitoring, logging, and handover docs.
LinkedIn Pipeline Orchestrator
Job Application Scoring Flow
WhatsApp Support Agent
Restaurant Voice Concierge
Car Part Arbitrage Monitor
Video Summary Automation
I've built dozens more across n8n, Make.com, Zapier, GoHighLevel, HubSpot, WhatsApp, Slack, and Google Workspace. If you need a workflow automated, I've likely shipped a version of it before.
Technical Skills
Comprehensive expertise across modern development stack with focus on scalable web applications and DevOps practices.
Automation & Orchestration
AI & Machine Learning
Backend & Infra
Data & Analytics
What Clients Say
Operators choose Arcade when outcomes matter.
“The voice AI he built answers every call, qualifies the lead, and books the appointment before we'd have even picked up the phone. Our missed-lead problem is just gone.”
Sarah Chen
Founder, Growth Agency
“After-hours leads used to sit until morning. Now they get a call, text, and email within minutes. Response time went from hours to under two minutes.”
Marcus Bell
Operations Lead, Home Services
“We handed him a vague idea and got back a full architecture, a working prototype, and a clear rollout plan. He thinks like an owner, not a contractor.”
Priya Nair
SaaS Founder
Let's Work Together
Ready to bring your next project to life? Let's discuss how my expertise in full-stack development and DevOps can help achieve your goals.
Location
Angeles City, Central Luzon, PH · Remote Worldwide