Full-Stack Developer in Metro Manila
Den Jansen Flores is a senior full-stack developer based in Muntinlupa City, Metro Manila. He is available for freelance builds, contract engagements and full-time roles. His work covers React and Next.js interfaces, TypeScript server logic, Supabase and PostgreSQL data models, access control, integrations and deployment.
What can one full-stack engagement cover?
The useful boundary is the system, not one layer of it. Den can own the route from an operational problem to a deployed web application, then make every handoff visible enough to maintain.
Product interface
Responsive React or Next.js interfaces with clear states, accessible controls and workflows built around the real job users need to finish.
Application and data layer
TypeScript services, PostgreSQL schemas, Supabase policies, authentication and integrations designed as one authority chain rather than separate features.
Operational SaaS
Multi-tenant scheduling, records, dispatch and workforce systems where permissions, history and recovery paths matter as much as the primary screen.
Delivery and hardening
Build checks, deployment configuration, responsive QA, failure-state review and a handoff that states what is verified and what still needs an owner decision.
When is Den the right fit?
- A business process has outgrown spreadsheets, chat threads or disconnected tools.
- A product needs one accountable engineer across database, API and interface work.
- An existing React or Next.js system needs a careful audit, stabilization or feature build.
- A founder or team wants an evidence-backed prototype without pretending it is already production-ready.
Projects connected to this service
The portfolio contains shipped systems for healthcare operations, dental records, courier dispatch and workforce coordination. Each case study names the problem, architecture, ownership, deployment status and source visibility.
ClinicFlow
Clinic operations case study covering doctor availability, appointments, patient records and role-separated staff and patient portals.
Smiley
Multi-tenant dental SaaS case study with clinic data isolation, subdomain routing, patient records, scheduling and reminders.
Biyahero Express
Courier logistics case study covering dispatch, shipment tracking, proof of delivery, COD reconciliation and client invoicing.
ShiftDesk
Workforce SaaS case study with GPS-verified clock-ins, threaded ticket lifecycles and role-separated employee and admin views.
How the engagement moves
Map the operation
Identify the people, decisions, records and failure points before choosing screens or frameworks.
Set the authority
Define which layer owns validation, access and state so the interface cannot invent business truth.
Build the critical path
Ship the smallest end-to-end workflow that proves the model, then widen it without breaking the chain.
Verify the release
Run build, browser, responsive and accessibility checks, then separate verified behavior from remaining provider or owner gates.
Questions before contact
Is Den available as a freelance full-stack developer in Metro Manila?
Yes. Den is based in Muntinlupa City, Metro Manila and is available for freelance projects, contract engagements and full-time roles. He can work remotely with Philippine or international teams.
Which full-stack technologies does he use?
His primary stack is React, Next.js, TypeScript, Node.js, Supabase and PostgreSQL. The final choice follows the product constraints; the framework is not allowed to become the architecture.
Can he take an application from database to deployment?
Yes. His documented work includes relational schemas, row-level security, server logic, authentication, responsive interfaces, integrations, deployment configuration and production-style verification.
How does a potential client start?
Send the current workflow, the failure it causes and the deadline that matters. Den will identify the first useful boundary, the evidence needed and any scope risks before proposing a build.
Bring the workflow that needs an owner.
Send the current process, the failure it creates and the deadline that matters. You will get a direct response from Den, usually within one business day on UTC+8.
Email Den