Open to opportunities

Ivan Martinez

@ivanmartinez1

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Full Stack Developer and Tech Lead building production multi-tenant SaaS with React and NestJS.

Bolivia

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What I'm looking for

I want to build and lead production SaaS with strong architecture, focusing on full-stack delivery—multi-tenant systems, scalable backends, reliable infrastructure, and fast iteration in Agile teams.

I’m a Full Stack Developer with 4+ years of experience building production-grade SaaS platforms. I’ve specialized in React, Node.js, Next.js, and NestJS, and I’m comfortable owning end-to-end architecture—especially in multi-tenant environments.

Currently, I’m Tech Lead at Redlizard Studioz, where I built from scratch a multi-tenant document management platform, promoted to Tech Lead after 3 months, and designed per-company subdomain isolation with Cloudflare. I’ve also engineered billing with Stripe Invoices, notifications with Twilio and Postmark (queued/retried via Redis), and production deployments on Linux with pm2 plus Keycloak for identity and access management.

Earlier roles included building real-time chat with Firestore across workflow stages and replicating AWS production environments for staging from scratch. I’ve improved performance by redesigning table structure, removing N+1 ORM calls, and implementing materialized views (cutting a query from 28s to 3.5s), while working in Agile/Scrum teams using Jira.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer - Tech Lead

Current

Redlizard Studioz Inc.

Sep 2025 - Present (10 months)

Tech Lead building a document management SaaS for heavy transport companies, owning end-to-end architecture, business logic, and production infrastructure. Implemented multi-tenant isolation, billing with Stripe Invoices, notifications with Twilio/Postmark, and secured identity with Keycloak.

Cloudflare PostgreSQL Notifications Twilio Postmark Redis Scheduled Jobs Linux PM2 Keycloak CI CD Agile Scrum Jira

Software Engineer

Nacer Digital

Feb 2025 - Jan 2026 (11 months)

Built a real-time multi-role chat system with Firestore, including persistent workflows and a multi-role ratings model. Developed milestones, time logs, and dispute resolution flows, and replicated an AWS production environment for staging.

Firestore Chat Multi Role System Last 5 Reviews Milestone Dispute Resolution AWS Amplify Elastic Beanstalk RDS SSL AWS Multi Role Systems

Software Engineer

IVENTIVA

Apr 2023 - Feb 2025 (1 year 10 months)

Designed and built a multi-stage notification pipeline that schedules up to nine retries per user for identity verification, bank authentication, and mortgage capacity flows. Improved performance by redesigning tables, removing N+1 ORM calls, and adding materialized views, while managing Heroku deployments and production incident response.

Identity Verification Bank Authentication Mortgage Capacity Workflows SQL N+1 ORM Call Elimination Materialized Views Heroku Incident Response ORM

Full Stack Developer - Intern

Fundacion Jala

Jan 2022 - Jan 2023 (1 year)

Worked as a Full Stack Developer Intern applying SOLID principles, design patterns, functional programming, and clean architecture to real projects in Agile/Scrum teams.

SOLID Principles Design Patterns Functional Programming Clean Architecture Agile Scrum Jira