Custom software, built by the person you talk to*
I'm Isaac Manubag. For ten years I've designed, built and shipped web and mobile systems — from single-site businesses to multi-site operations — one developer, start to finish, no handoffs and no account manager in between.
Figures are from live client deployments; references available on request.
Four engagements, one operator. Scoped in a call, quoted in writing, delivered in increments you can use before the project ends.
Custom platforms
Line-of-business systems that match how your team already works — billing, scheduling, records, reporting.
Web applications
Laravel and Angular apps with real auth, real roles and an admin panel your staff can actually operate.
Mobile apps
One cross-platform codebase for iOS and Android, shipped to both stores and maintained after launch.
Cloud & upkeep
Containerised deploys, backups, monitoring and payment integrations — kept boring on purpose.
A product, not a project — 35+ gyms run on it
SenseiDesk is my own SaaS: a management platform for Philippine martial arts schools, built and shipped solo from first sketch to paying subscribers. It replaces the spreadsheet-and-group-chat routine with automated invoicing, GCash and bank payment tracking, one-tap attendance, belt progression and parent notifications — in one portal for coaches, students and parents.
Schools in Luzon, Visayas and Mindanao are live on it, most of them onboarded within a day. Running it end to end — product, code, infrastructure, support — is why client work starts from how a business actually operates, not from a feature list.
Atleta Agila — a custom edition, built to their workflow
Atleta Agila needed more than a subscription: their programs, roles and reporting don't match how a standard dojo runs. So they get a dedicated edition of the SenseiDesk platform — the proven core, reshaped around their own processes and rules.
It's the engagement I recommend when a business has outgrown off-the-shelf software but doesn't want to fund a platform from zero: start on something already running in 35+ gyms, then build the parts only they need. Currently in active development.
An ERP for a Philippine industrial services firm
NCPSI runs projects, crews and materials across sites. I'm building their internal operating system in phases over a 24-month engagement — starting with HR, attendance and payroll, including SSS, PhilHealth, Pag-IBIG and withholding tax compliance, then layering billing, materials, inventory, procurement and project cost tracking on the same foundation.
Each period ships a working focus area and keeps supporting everything delivered before it, so the business gets value every quarter instead of waiting two years for a launch. Sequencing is re-prioritised with them as operations change.
Roadmap — 24 months, 8 phases
| Period | Focus |
|---|---|
| Months 1–3 | HR, attendance & payroll — go-live of the core |
| Months 4–6 | Client billing & invoicing |
| Months 7–9 | Materials management across projects |
| Months 10–12 | Inventory: stock levels, movements, locations |
| Months 13–15 | Procurement: requests, orders, suppliers |
| Months 16–18 | Project cost tracking for profitability |
| Months 19–21 | Cross-module operational reporting |
| Months 22–24 | Stabilisation, integration & enhancements |
Indicative roadmap — order and scope are confirmed with NCPSI as operational priorities shift.
Ten years of production work across these — plus the Docker, Postgres and CI plumbing that keeps them running once I hand over the keys. I also build with AI tooling day to day, which is why small budgets still get thorough work.
“We cut admin work by seventy percent. The front desk teaches now instead of chasing receipts.”
“Everything is systematic now — belt tests, fees, attendance, equipment — recorded in one click. Parents, students and coaches all have access.”
Tell me what's slowing you down
A short note is enough to start. I reply within one business day with either a plan or an honest referral.