Denmark Crisostomo
Denmark Crisostomo

Full Stack Developer

Actively looking · Member since 17 Oct 2026
Location
Caloocan City, Philippines
Desired salary
1000–1500 USD/monthly
Work preference
Remote Only / Full Time, Part Time, Contract, Freelance
Experience level
Mid

About

Professional summary

I am a Full Stack Developer with hands-on experience building scalable, high-performance web applications with React, Node.js, Next.js, and NestJS. I work across frontend and backend development, with a focus on clean architecture, secure systems, and reliable production deployments.

I build RESTful APIs, authentication and authorization workflows, multi-tenant applications, and payment integrations. My backend experience includes PostgreSQL, Prisma, Redis, MongoDB, MySQL, and secure database access patterns such as Row-Level Security.

I have worked in contractual, freelance, internship, and personal-project environments. My experience includes SaaS booking platforms, property and tenant management systems, blockchain-related storage solutions, threat intelligence platforms, and URL management applications.

I prioritize security best practices in my work, including JWT and OTP authentication, role-based access control, session management, rate limiting, spam protection, tenant data isolation, and secure payment processing through Stripe.

I am comfortable working in agile and production environments, collaborating with teams, solving technical problems, and maintaining high code quality through automated testing. I use tools such as Vitest, Playwright, Docker, Git, and Vercel to support dependable development and release workflows.

I am motivated by technology exploration and enjoy continuously improving my full-stack engineering skills while delivering practical, user-focused applications.

Notice period: Immediately

Skills

41 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Full Stack Developer Beyond Automated

Built booking and access-control functionality for a multi-tenant SaaS platform, covering bookings, machines, staff, customers, and locations. Used NestJS, Payload CMS, and PostgreSQL to deliver production-oriented application features.

Implemented PostgreSQL Row-Level Security across bookings, sessions, and audit logs to enforce tenant data isolation at the database layer. Integrated Stripe Checkout Sessions, Payment Intents, and webhooks, including automated access-credential generation after successful payment.

Developed staff authentication flows with session refresh and remember-me functionality. Connected Next.js login and dashboard route protection to a NestJS authentication API using TanStack Query.

Full-Stack Developer UpaJuan

Building and deploying a production-ready property, tenant, lease, and rent-payment management application. The application uses TypeScript, React, Next.js, NestJS, PostgreSQL, Prisma, Redis, Tailwind CSS, Turborepo, and Vercel.

Launched a live waitlist backed by PostgreSQL with branded welcome emails through Resend, one-click unsubscribe functionality, Cloudflare Turnstile spam protection, rate limiting, and automated database updates on release. Designed a tenant login experience using one-time email codes and access checks that restrict tenants to their own data.

Implementing PostgreSQL Row-Level Security to isolate landlord data at the database level. Maintained automated tests using Vitest and Playwright against a real PostgreSQL database within a Clean Architecture and Domain-Driven Design codebase.

Full Stack Developer (Backend Focused) Holy Protocol

Built and maintained backend services and REST endpoints using NestJS and TypeScript. Implemented secure production authentication workflows with Better Auth.

Integrated ArDrive decentralized storage for blockchain-based content persistence. Integrated Stripe and Stripe Connect to support payment processing and affiliate payouts.

Full Stack Developer Intern Clairvoyance

Developed backend features for a threat intelligence platform using the MERN stack and TypeScript. Contributed to application functionality in an internship environment.

Implemented JWT-based authentication and role-based authorization. Integrated external threat intelligence APIs including Shodan, VirusTotal, Censys, Fofa, and Urlscan.

Full Stack Developer BytesMe

Built a full-featured URL shortener application using Next.js, Prisma, Clerk, and Shadcn UI.

Implemented administrative and user dashboards for link creation, management, and administration.

Education

Learning history

STI College, Caloocan City

Bachelor of Science, Computer Science

AMA College Caloocan

Bachelor of Science, Computer Science

Xavier Technical Training Center, Caloocan City

Technical Training

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