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Johan Stiven Rengifo

@johanstivenrengifo

Backend and full-stack developer at Fajo Group building enterprise apps and automating processes with AI.

At Fajo Group, I develop backend and full-stack enterprise applications with TypeScript, Node.js, and PostgreSQL. My work includes secure APIs, external service integrations, and AI-powered process automation.

At Ferretería Obra Blanca, I built the company’s ERP for sales, inventory, invoicing, accounts receivable, payments, users, authentication, and reports. I also worked with CI/CD pipelines, Docker deployments, and Grafana monitoring.

I developed the backend for a multi-company payroll SaaS, with domain-oriented design for employees, payroll periods, deductions, and reports.

I’ve also created WhatsApp support bots and workflows connected to databases and CRMs, using OpenAI and Claude.

Experience

Work history, roles, and key accomplishments

Software Engineer

Fajo Group

Jan 2026 - Oct 2026 (9 months)

Developed backend and full stack enterprise applications using TypeScript, Node.js, and PostgreSQL. Integrated external services, built secure APIs, and automated processes with AI.

TypeScript NodeJS PostgreSQL API Development AI Integration

Full Stack Developer

Ferretería Obra Blanca

Feb 2025 - Aug 2026 (1 year 6 months)

Built the company's ERP system covering sales, inventory, invoicing, accounts receivable, payments, users, authentication, and reporting. Implemented CI/CD pipelines, Docker deployments, and monitoring with Grafana.