SalvadorRegistration
Create the member, assign a plan, establish the membership period, and record the initial payment as one connected action.
Full-stack case study · Private operational product
GymFlow
One authenticated system for member registration, plans, renewals, payments, and the daily financial activity behind a gym.
Role
Solo full-stack developer and product designer
Delivery
One week · approximately 42 hours
Current use
Active operational deployment
Access
Private deployment
The challenge
Replace fragmented administration with one workflow
Before GymFlow, staff registered members in Excel and handled expiration reminders manually. Every registration, renewal, and payment required moving between disconnected records and repetitive administrative steps.
The goal was not simply to replace a spreadsheet. The system needed to connect each member to a plan, access period, and payment history while remaining clear enough for daily front-desk use.
GymFlow now supports active operational workflows, while the product direction remains suitable for gyms in different markets.
Core system
Built around the membership lifecycle
Each workflow connects operational actions to the underlying membership and financial records.
Renewals
Extend access without discarding remaining membership time and preserve the associated renewal payment.
Financial reporting
Filter payments by period, method, shift, member, plan, or receipt and review practical daily summaries.
Bilingual operation
Spanish and English interfaces share the same workflows, with the selected language preserved for staff.
Architecture
One typed path from interface to database
Business actions stay on the server, validate their input, and write relational records through Prisma. The interface receives structured, localized feedback without exposing database access to the browser.
01React form
02Zod validation
03Authenticated Server Action
04Prisma transaction
05PostgreSQL
06Localized UI feedback
Next.jsTypeScriptPostgreSQLPrismaBetter AuthZodTailwind CSS
Product walkthrough
The operational experience
Dashboard overview
Daily revenue, membership status, upcoming expirations, recent payments, and active plans.
Payment reporting
Period and shift filters, method breakdowns, transaction grouping, and daily subtotals.
Member registration
Member information, plan selection, membership dates, and initial payment in one workflow.
Member details
Current membership, expiration status, access period, payment context, and renewal action.
Plans management
Reusable membership plans with clear duration and pricing rules.
Login and language
Authenticated access with Spanish and English interface preferences.
Key decisions
Reliability before unnecessary complexity
Relational consistency
Nested database writes keep member, membership, and payment creation connected.
Protected operations
Both dashboard routes and business actions verify an active server-side session.
Business-aware dates
Membership periods and payment timestamps follow different rules instead of forcing all dates into one model.
Mobile-specific views
Administrative tables become focused mobile records rather than horizontally scrolling desktop layouts.
Current result
Finished software, active in daily use
GymFlow is actively used in private operations. It replaces the previous Excel-based registration process with a connected system for memberships and payments. The delivered system is complete; reminder automation remains a possible future enhancement rather than unfinished core work.
Source and access
The source repository and live deployment remain private to protect the implementation and client confidentiality. Identifying information and operational details, including client volume, are never disclosed. A guided demo can be shared directly with prospective employers or clients.
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