MLMark LumbayLead software engineer

Mark Lumbay

Lead Software Engineer at Sageware Solutions

Product-minded AI Engineering Cat dad of two

Mark Lumbay
MARK LUMBAYCAGAYAN DE ORO, PH

Personal profile

Product first. Engineered to last.

I'm a product-minded lead engineer: I run discovery, make the product calls, and set the architecture, with applied AI part of how I work every day. I borrowed my philosophy from the cockpit: stay ahead of the aircraft. Anticipate the next state before you arrive at it; never just react.

Interface
  • Next.js
  • React
  • TypeScript
  • Inertia.js
  • SwiftUI
Application
  • Laravel
  • Filament
  • FastAPI
  • Pydantic AI
  • Python
Data and infrastructure
  • PostgreSQL
  • Supabase
  • Docker

Work experience

From intern to lead engineer.

AUG – DEC 2023

Web Developer Intern

Syntactics Inc.

Maintained and debugged client WordPress sites, including a mail-provider failure that was quietly breaking contact forms. Built the frontend for Paw-Tah, an internal app concept.

Web Developer Intern
2024

BS Information Technology, Magna Cum Laude

Xavier University – Ateneo de Cagayan

Lead engineer, architect and project manager on XU VMS and the PIKIFI information system.

BS Information Technology, Magna Cum Laude
OCT 2024 – PRESENT

Software Engineer

Sageware Solutions

Started on Laravel, Filament and PostgreSQL delivery; grew into authentication, API design, data-flow reliability and AI integration.

Software Engineer
CO-ARCHITECT

Scoring and decision engine

Helped architect and build a decision engine that scores car rental applications against scorecards managed in the system itself.

Secondsto originate, down from weeks or months

SCORECARD · RENTALApplication scoreIncome stability+32Rental history+24Employment tenure+18Existing obligations−6Documents verified+10DECISION78/ 100CUT-OFF 60APPROVEDORIGINATION TIMEweeks to months→seconds
DATABASE RECOVERY

Corrupted production schema

Found only 14 of 33 foreign keys. Cleaned orphans, rebuilt the schema and restored clean data while a partner company kept integrating.

33/33keys restored, zero data loss

usersordersinvoicesproductsorder_itemspaymentsFOREIGN KEYS14 → 33ORPHANS CLEARED
AI ENGINEER

Busolv AI Calorie Counter

Built per-dimension evaluation workflows and tuned prompts against them. A new domain and a new discipline, learned on the job.

84%food quantification accuracy

Busolv AI Calorie Counter
APPLIED AI

Candidate assessment evaluator

AI scoring, analysis and honeypot checks for exam submissions, grounded by a curated context-pack so grading stays consistent.

SUBMISSION #0421Candidate assessment86Correctness92Code quality84Reasoning88Edge cases76HONEYPOT · CLEANCONTEXT PACK v3
FIRST LEAD ROLE

Dermatology clinic platform

Owned the warranty and post-launch phase: weekly technical direction, triage, releases and client communication, knowing when to push back and when to agree.

VCMSKINCARE
INCIDENT LEAD

Compromised dependency

A poisoned job queue was injecting scripts into responses. Contained it, rotated every credential, then hardened the app, database and server layers.

INCIDENT RESPONSECONTAINEDjob queueHARDENEDAppDatabaseServerCREDENTIALS ROTATED
LEAD ENGINEER

Core loans system for BHF Lending

Discovery to handover

Led discovery on site in Baguio, from Q&A and live prototypes to working in their departments, and got the requirements signed. Then set the architecture and weekly sprints, and proved the engine against their production loans.

95%of testable production loans matched

Core loans system for BHF Lending
Mark Lumbay
Mark speaking to a room of students
ON STAGE
2024 – PRESENT

Lead Software Engineer at Sageware Solutions

I lead projects from the first client meeting to handover: discovery, requirements, architecture, weekly sprint direction, and coaching the engineers I work with. I work product first, so we build what users actually need, with the architecture and UX to match, not just more of it.

Testimonials

What colleagues say about working with me.

Mark served as the software lead on one of the projects I was assigned to, and it remains one of the best collaborative experiences I’ve had. As someone working in QA, I especially appreciated how he approached bugs. Whenever I raised an issue, he treated it as something to understand rather than simply something to fix, uncovering deeper edge cases in related features that made more complete fixes.

Rhea Salve GuingaoTechnical QA Specialist

Mark served as the software lead on one of the projects I was assigned to, and it remains one of the best collaborative experiences I’ve had. As someone working in QA, I especially appreciated how he approached bugs. Whenever I raised an issue, he treated it as something to understand rather than simply something to fix, uncovering deeper edge cases in related features that made more complete fixes.

Rhea Salve GuingaoTechnical QA Specialist

Great team member and can effectively communicate and get along with other members to make sure goals are met. He has excellent work ethic which is shown through leading projects and continous self-learn in his work. Outside of work, he can be a great and reliable person, overall. A testament to his consistentency and integrity

Nicky PojasProject Manager

I had the privilege of working alongside a brilliant individual who consistently brings intelligence and clarity to the table. During our time working together, I was impressed by his strong leadership skills and exceptional time management. He is a proactive, fast learner who is always eager to expand his knowledge. Beyond his technical abilities, Mark is highly articulate and communicates complex ideas with ease. I have no doubt that he will be a valuable asset to any organization he joins.

Kit Francis E. SajulgaAdmin & IT Associate

Mark Christopher demonstrates a well-rounded level of professional excellence through strong technical proficiency and adaptability. He consistently delivers high-quality results, even in challenging or high-pressure environments. Easy to work with and collaborative in approach, he brings a steady and dependable presence to team settings. He has proven experience working across diverse environments as a Full Stack Developer, with hands-on expertise in Laravel, Filament, FastAPI, and Pydantic AI.

Raj Byron A.Information Systems Analyst

I’ve worked with Mark before, and I can confidently say he knows how to steer the ship. His leadership is exceptional, and his skills are always at the top of his game. I can fully vouch for him.

Eric CaneteGVA | EVA

He's quick to adapt in any situation, and is a fast problem solver. A consistent trait of his is that he's always looking to learn new things and works hard to master them. Every output he submits is bound to be outstanding in anyway.

Renee RimandoGeneral Project Manager

Mark is one of the best colleagues you could ask for, excelling in both knowledge and leadership. While we haven’t worked on many projects together, he is someone I can always rely on for guidance and practical solutions. Mark is a true jack-of-all-trades and master of all versatile, highly skilled, and deeply committed to everything he does. His ability to adapt and take ownership makes him an invaluable teammate.

Montano Kiseo IIIDeveloper

Calm and very adaptive under pressure. He solves a lot of difficult problems reliably because of his proactive mindset, and experience. Pagdating sa memes proactive mindset and experience din. Certified professional on both fronts.

Shan TorrejosWeb Developer

Mark/Cap is the kind of friend and teammate you can genuinely rely on. Mark/Cap is always calm under pressure, accountable with tasks, and always willing to learn and improve. They uplift the people around them through consistent support, a respectful attitude, and work you can trust to be done well.

Engr. Hilkiah PadugananElectronics Engineer

Mark is one of the easiest people to work with. He’s helpful, patient, and always does his best to fix any issue that comes his way. He’s super approachable, fun to talk to, and gets along well with everyone on the team. You can always count on him to stay calm, stay positive, and keep things moving.

Jan Hakeem SangkulaDesktop Support Engineer

Mark is one of the most talented and humble people I know. He is solution oriented and would always try his best to solve any problem he faces. Easy to converse with and is good with people 👍

Sofia May MabaitAssociate

2 words. Hard. Carry. Works himself to the bone but also parties hard when the work is over. You can trust him to get the job done.

Elijah PeraltaIT Support

Hardworking, You'll be sure to get quality outputs from him.

Eli YanaFreelance Digital Artist
01 / 13
POLARIS ↑ · YOUR PROJECT COULD BE NEXT

Projects

ALKAID · 104 LIGHT-YEARS AWAY01 / 07

Busolv

An AI-powered health and fitness companion: snap a photo of a meal for calories and a macronutrient breakdown, plus meal planning and progress tracking.

  • AI Integration
  • SwiftUI
  • FastAPI
  • Pydantic AI
  • Supabase
View project ↗
Busolv

Ursa Major, gnomonic projection at 12ʰ24ᵐ +56°. J2000 positions; star colour from spectral class.

Projects

Selected builds, one for each star of the Big Dipper.

  1. Busolv
    ALKAID · 104 LIGHT-YEARS AWAY01 / 07

    Busolv

    An AI-powered health and fitness companion: snap a photo of a meal for calories and a macronutrient breakdown, plus meal planning and progress tracking.

    • AI Integration
    • SwiftUI
    • FastAPI
    • Pydantic AI
    • Supabase
    View project ↗
  2. Home Security System (Lite)
    MIZAR · 86 LIGHT-YEARS AWAY02 / 07

    Home Security System (Lite)

    Built in a single night after signs of tampering at home: an old phone as the camera, YOLOv8 person detection, and alerts with a photo and clip via Discord and WhatsApp.

    • Vision AI
    • Python
    • YOLOv8
    • Local AI
    View project ↗
  3. Starlux
    ALIOTH · 83 LIGHT-YEARS AWAY03 / 07

    Starlux

    A landing page for a fictional game studio with its own realtime social feed: posts, likes and comment threads that update live. Built solo, end to end.

    • Laravel
    • Tailwind CSS
    • MySQL
    • Pusher JS
    View project ↗
  4. Lynx Obsidian AI Plugin
    MEGREZ · 81 LIGHT-YEARS AWAY04 / 07

    Lynx Obsidian AI Plugin

    Highlight a section of messy notes and Lynx summarises, organises and enhances it, keeping the key information and losing the noise.

    • AI Integration
    • TypeScript
    • Obsidian API
    View project ↗
  5. XU VMS
    PHECDA · 84 LIGHT-YEARS AWAY05 / 07

    XU VMS

    Visitor management for Xavier University that streamlines the visitor experience and bolsters campus security. Thesis project; I was the lead engineer and architect.

    • Quasar JS
    • Express JS
    • MongoDB
    • Pusher JS
    View project ↗
  6. PIS for PIKIFI PH
    MERAK · 80 LIGHT-YEARS AWAY06 / 07

    PIS for PIKIFI PH

    A personal information system for Philippine Island Kids International Foundation, Inc. that streamlines how the organisation manages its data.

    • Quasar JS
    • Express JS
    • Firebase
    • Figma
    View project ↗
  7. Markimoo.ai
    DUBHE · 123 LIGHT-YEARS AWAY07 / 07

    Markimoo.ai

    This portfolio's AI co-pilot: a RAG chatbot over pgvector and OpenAI embeddings that answers questions about me, hardened with rate limits and prompt-injection checks.

    • Next.js
    • RAG
    • Supabase pgvector
    • Vercel AI SDK
    View project ↗

Let's build something worth launching.

Got a role or a project in mind? Tell me about it. My cats will get right on it.

Cagayan de Oro · UTC+8