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I will do custom CRM, erp or pos system for your business
Hanner V
Level 1
About this gig
Still running your business on spreadsheets or paying monthly for a CRM that doesn't fit how you work? I build custom management systems that match your exact process: CRM, ERP, POS, inventory and admin systems.
Full stack developer with management systems in production: a multi-tenant accounting platform covering 19 tax obligation types, a school ERP, and a certification platform generating official signed documents.
What I build:
- Custom CRM: clients, pipeline, tasks and follow-ups
- ERP modules: inventory, sales, purchases, billing
- POS systems with products, sales and daily reports
- Role-based access: each user sees only what they should
- Dashboards, alerts and Excel/PDF reports your team actually uses
Every system includes:
- Web-based, responsive: works on any device, no installs
- Your data imported from your current spreadsheets
- Full source code via Git or ZIP no monthly license, it is yours
- Milestone workflow available: approve each stage as it is built
How I work:
- Clear scope and price agreed before starting
- Revision rounds defined per package
- 7-day support window after delivery
Please note: custom code only I do not customize Salesforce, Odoo, Zoho or WordPress.
Get to know Hanner V
Hanner V
Full stack developer building scalable web platforms and business systems
Level 1
- FromColombia
- Member sinceApr 2024
- Avg. response time1 hour
- Last delivery1 week
Languages
English, Spanish
I build full-stack web products — including SaaS platforms, ERPs, business management systems, and custom APIs — for companies that need reliable, production-ready software.
My recent work includes an online learning platform with Stripe payments and CI/CD, a school management ERP built with React 19 and TypeScript, an accounting system for the Puerto Rico market using Next.js 15 and Docker, and a B2B marketplace backend developed with NestJS, WebSockets, and automated testing.
Stack: React, Next.js, TypeScript, NestJS, Laravel, .NET, MySQL, PostgreSQL, MongoDB, Docker, Stripe, AWS.
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FAQ
What counts as a "module"?
A functional area of your system: clients, inventory, sales, billing, reports, users. We define the module list together before starting, so the scope is exact.
Can you replace our spreadsheets?
Yes — that is the most common project. I import your existing Excel data into the new system so you do not start from zero.
Is this a monthly subscription like other CRMs?
No. You pay for the build once and the system is yours: full source code included, no per-user fees.
Can multiple users work with different permissions?
Yes: role-based access (admin, employee, read-only or custom roles), enforced on the server, not just hidden buttons.
How many revision rounds are included?
1 in Basic, 2 in Standard, 3 in Premium. New modules or changes outside the agreed scope are quoted separately.
