Jairo Hernandez
Mentor
Rising Codementor
US$10.00
For every 15 mins
ABOUT ME
TypeScript Engineer with over 7 years of experience
TypeScript Engineer with over 7 years of experience
Lead engineer building regulated carbon accounting and compliance platforms (CBAM, SB 253, CSRD). 7+ years shipping multi-tenant SaaS in React/Next.js, TypeScript, Node.js, and PostgreSQL with AWS-native infrastructure. Proven record driving SOC 2 readiness, 30%+ performance gains via Next.js migrations, and bilingual (EN/ES) delivery for globally distributed teams.
Spanish, English
Central Time (US & Canada) (-06:00)
Joined March 2024
EXPERTISE
8 years experience
7 years experience
7 years experience
8 years experience
8 years experience
5 years experience
8 years experience
REVIEWS FROM CLIENTS
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EMPLOYMENTS
Fractional CTO
Stealth Startup
2025-07-01-Present
- Architected a Next.js 15 + Drizzle/Postgres multi-tenant platform with supplier portal, CSV imports, GHG calculators, and audit-r...
- Architected a Next.js 15 + Drizzle/Postgres multi-tenant platform with supplier portal, CSV imports, GHG calculators, and audit-ready CBAM/SB 253/CSRD exports.
- Implemented RBAC, JWT auth, CSRF protection, rate limiting, and background jobs for bulk imports/report generation; instrumented PostHog analytics for finance workflows.
- Integrated QuickBooks, Xero, Shippo, and Excel connectors; owning roadmap, feature flags, integration tests, and deployment automation while scoping AI copilots for onboarding/ calculators.
HTML/CSS
SQL
Node.js
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HTML/CSS
SQL
Node.js
TypeScript
React
JavaScript
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Lead Software Engineer
Attempt Technologies
2024-04-01-2025-07-01
- Built a Next.js + FastAPI internal flight operations platform with Keycloak SSO, real-time sync, and modular admin tooling for Sw...
- Built a Next.js + FastAPI internal flight operations platform with Keycloak SSO, real-time sync, and modular admin tooling for Swiss charter operators.
- Refactored API boundaries, cutting integration time for new ops features by 25% and enabling faster regulatory updates.
HTML/CSS
Python
SQL
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HTML/CSS
Python
SQL
Node.js
TypeScript
React
JavaScript
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Software Engineer
Workhands
2022-12-01-2024-03-01
- Revitalized the core business app, enhancing performance and UI, facilitating a smoother apprenticeship and job board experience ...
- Revitalized the core business app, enhancing performance and UI, facilitating a smoother apprenticeship and job board experience across Android, iOS, and web platforms. Worked on the full stack with React & Ruby on Rails.
- Spearheaded the development of a pivotal tool, reducing PIRL report error reso- lution time by 50%, boosting operational efficiency for apprenticeship programs.
- Implemented maintenance protocols for the React app for better CI/CD.
Ruby
Ruby on Rails
Elasticsearch
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Ruby
Ruby on Rails
Elasticsearch
TypeScript
Sidekiq
React
Redux
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PROJECTS
Cenit BankView Project
2024
Securely manage and transfer funds between your linked accounts. Connect any banking account using Plaid, and securely transfer funds bet...
Securely manage and transfer funds between your linked accounts. Connect any banking account using Plaid, and securely transfer funds between connected accounts using Dwolla.
HTML/CSS
Node.js
TypeScript
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HTML/CSS
Node.js
TypeScript
React
JavaScript
Sentry
Next.js
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