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Justin Valencia

Software engineering lead who still writes code.

I build AI agent platforms, internal tools, and the SaaS I run myself.

Based in Marikina, PhilippinesOpen to new roles

jstnvlnca@gmail.comGitHubLinkedInRésumé

Selected work

2026
Focus Global Inc.
Sole engineer
Internal

Focus Intelligence

The company’s first production AI platform, built end to end as the sole engineer. A coordinator agent routes plain-language questions from managers to permission-scoped specialist agents that query live operational data and return evidence-backed answers.

Speed
Fifteen days from empty repository to running on AWS ECS behind Slack SSO.
Permissions
Enforced at the tool boundary — 12 typed tools across 2 specialist agents, each checking a per-module permission before execution, so the agent can’t surface data the signed-in user isn’t cleared for. 15 permission modules, 72 automated tests.
Trust
Built against hallucination: evidence-required answers, cross-source validation, and an explicit “unable to determine” path instead of a confident guess.
Architecture
Deliberately built without RAG — the questions are aggregations over relational data, where retrieval would trade completeness for relevance.
Stack
TypeScript · Next.js · Vercel AI SDK · OpenAI · tRPC · Prisma · PostgreSQL · AWS ECS Fargate · SST · Docker · Langfuse
2025 — present
Independent
Solo

Flowpass

Seat-mapped ticketing platform I built and operate solo.

3 productions · 2,830 tickets · roughly ₱2.4M processed

Product
Attendees pick seats from a live map, pay via QRPh, and get a QR ticket emailed in seconds.
Proof
At UP Street Dance Club’s Chosen Ground 19 — 3 events, 1,447 tickets, 1,000+ attendees in a single day — offline-tolerant camera QR scanning cut entry queue time 80% against the prior year’s wristband process.
Operations
I write all the code, onboard every client personally, and own uptime during live events.
Stack
Next.js · React · TypeScript · tRPC · Prisma · PostgreSQL · Better Auth
2026
Independent
Solo

Flavor Dance Studio

Public booking platform for a Marikina dance studio, plus the admin system that runs it. Studio rental blocks and drop-in classes are booked against live availability and paid via QRPh.

Correctness
The availability engine reconciles operating hours, one-off closures, and per-slot templates, so double-booking isn’t possible by construction.
Scope
Brand system, layout, and copy are mine as well — the studio had nothing to work from.
Stack
Next.js · React · TypeScript · tRPC · Prisma · PostgreSQL
2025
Focus Global Inc.
Led 4 engineers
Internal

Warehouse Fulfillment Platform

Full-stack fulfillment application serving 50+ premium brands and 300,000+ annual orders, delivered with a four-developer team I led. Picking and packing were automated via AWS Lambda bridged to a Microsoft Dynamics AX legacy system, fully replacing a manual process and saving roughly 90 hours of operational work per month.

Stack
Next.js · React · TypeScript · Prisma · PostgreSQL · AWS Lambda · SST

About

I’m a software engineer in Marikina. Most of what I do is turning manual operations into working software — lately that means AI systems people can actually trust with real company data: permissions enforced in code, answers backed by evidence, and a sanctioned way for the system to say “I don’t know.”

I also dance. It’s less of a tangent than it looks — two of the projects above run for dance organisations.

I like problems where correctness matters and someone notices if you get it wrong.

Experience

Oct 2022 — Present

Focus Global Inc. Bonifacio Global City

Software Engineering Lead (Feb 2025) · Software Engineer II (2023) · Software Engineer I (2022)

I partner directly with the CEO, Executive VP, and department heads to turn business objectives into technical roadmaps, running concurrent projects with teams of one to four engineers. I’ve shipped systems across Warehouse, Servicing, Customer Service, Supply Chain, and HR. I work agent-first — Claude Code and Codex do most of the typing while I write the specs, set the guardrails, own the architecture, and review everything that ships.

Feb — Apr 2022

Netzwelt, Inc. Makati

Software Engineer Intern

Built .NET and C# business applications and 3 client-facing React modules.

Education

B.S. Computer Science, minor in Data Science — Technological Institute of the Philippines, 2022. GPA 3.82, on a four-year 80% academic scholarship.