Itiel Felix
Software Engineer · Full-Stack
Full-stack developer building production web applications and systems — from interfaces to infrastructure.
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Full-stack developer, end to end
I build and maintain production web applications using React and Node.js — from REST APIs to the interfaces that consume them. I work across the full stack and take ownership of the systems I build.
On the infrastructure side I'm comfortable with Linux, Nginx, PM2 and deploying applications that need to stay up. That context helps me trace bugs that don't stop at the application layer.
My strongest skill is probably diagnosis — sitting with a slow query or a broken system, reading logs, and finding the actual root cause rather than patching symptoms.
Based in
Israel
Experience
3+ years
Stack
React / Node
Interests
Tech stack
Tools and technologies I work with across the full stack.
Frontend
Backend
Infra & DevOps
Key achievements
Production incidents diagnosed and resolved.
Order System — Calculation Bottleneck
Problem
Order totals taking longer than expected on every entity update, degrading throughput under load.
What I did
Profiled the update pipeline and traced redundant recalculations across multiple model hooks. Confirmed hooks were firing on every intermediate state change, not just at the end of the transaction. Redesigned the pipeline to calculate totals exactly once at the end of the update process, eliminating all intermediate recalculations.
Result
Significant reduction in redundant DB operations per order update. Measurable throughput improvement in production.
Database — 10–15 Minute Query Latency
Problem
Simple SELECT, DELETE and GET queries timing out or taking 10–15 minutes, seemingly at random, with no obvious cause in the application code.
What I did
Analyzed slow query logs, CPU usage, memory and active processes — no obvious anomalies. Correlated timestamps of slowdowns with scheduled backup jobs. Confirmed the backup process was acquiring locks on the primary database, blocking concurrent operations. Provisioned a replica database and redirected the backup process to read from it, fully decoupling backups from production.
Result
Production query latency returned to baseline. Zero downtime incidents related to backup windows since deployment.
Things I've built
A selection of projects across web development, mobile, and backend systems.
21 Blackjack
Blackjack game built with Kotlin and Jetpack Compose. Clean UI, game logic from scratch, and smooth animations on Android.
Game List Retrofit
Android app that consumes a games API using Retrofit and displays results with Jetpack Compose. Clean architecture with modern Android stack.
uku-web
Web application built with JavaScript. Front-end focused project with a clean interface.
uku-front-3
TypeScript front-end application. Third iteration of the uku project with improved architecture and type safety.
MusicManagerAPI
RESTful API for managing music data, built with C#. Handles CRUD operations for a music catalog.
Let's work together
Available for new projects and opportunities. Feel free to reach out — I'll get back to you.