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Zack – Python, Node.js, React, experts in Lemon.io

Zack

From United States (UTC-5)flag

Full-stack Web Developer|Senior

Zack – Python, Node.js, React

Senior Full-stack Developer with 8+ years of experience across startups and Google, currently leading a team of 5 engineers. Skilled in building AI-powered features using Vertex AI and OpenAI, with strong expertise in React.js, Node.js, and database design. Experienced in schema migrations, system architecture, and delivering scalable solutions.

8 years of commercial experience in
AI
Architecture
E-commerce
Healthcare
Logistics
Product management
Social media
NLP software
Content management
Main technologies
Python
7 years
Node.js
7.5 years
React
7.5 years
Typescript
7.5 years
Next.js
5 years
AWS
3.5 years
Additional skills
NoSQL
MySQL
Blockchain
JavaScript
Flask
DynamoDB
MongoDB
Firebase
AWS Lambda
Docker
Kubernetes
Amazon EC2
Vertex AI
Django
LLM
Vue.js
PostgreSQL
Tailwind CSS
Express.js
Angular JS
Nest.js
React Native
CI/CD
GraphQL
OpenAI
Amazon S3
NLP
DeepSeek
REST API
Shopify
Spring Boot
GCP
OpenAI API
Direct hire
Possible
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Experience Highlights

Lead Software Engineer
Apr 2025 - Ongoing5 months
Project Overview

It's a local-first desktop automation tool that processes natural language commands, designed to automate desktop tasks such as file handling, app launching, and setting adjustments using voice or text input.

Responsibilities:
  • Developed a local-first Leads Automation tool using Python and Ollama to process natural language commands.
  • Deployed the DeepSeek R1 model locally to interpret user instructions and convert them into executable tasks.
  • Implemented AI-driven screen content recognition to detect UI elements and trigger context-specific actions.
  • Automated desktop tasks, including file management, app control, and system settings, via voice and text input.
  • Ensured data privacy and low-latency performance by keeping all inference and execution on-device.
  • Designed a modular architecture enabling seamless integration of new automation modules.
  • Optimized model loading and resource utilization for efficient local operation.
  • Added comprehensive logging and error-handling mechanisms for reliable execution.
Project Tech stack:
Python
DeepSeek
NLP
AI
React
Typescript
Nest.js
Docker
Full-Stack Developer
Dec 2023 - Mar 20251 year 2 months
Project Overview

It's a middleware app for Shopify that integrates third-party wholesale distributors, enabling e-commerce merchants to import, configure, and sync products directly from suppliers into their storefronts.

Responsibilities:
  • Built a Shopify integration app connecting stores with a wholesale activewear supplier for seamless product import and sync.
  • Designed a data ingestion pipeline to process supplier API data and display categorized products via a React UI.
  • Implemented dynamic pricing with configurable rules, discount margins, and automated adjustments.
  • Developed cron-based pipelines to sync inventory, pricing, and product updates across systems.
  • Integrated Shopify Admin API and webhooks for real-time product, order, and fulfillment handling.
  • Enabled two-way order and return sync using Spring Boot REST APIs.
  • Added real-time notifications for supplier price changes to prompt pricing updates.
  • Delivered a merchant portal for managing imports, stock, and returns from one interface.
Project Tech stack:
Node.js
React
Shopify
API
Spring Boot
REST API
Full-Stack Developer
Mar 2024 - Jan 202510 months
Project Overview

It's a logistics management application that enables enterprise-level logistics companies to manage orders, track inventory, and handle fulfillment workflows.

Responsibilities:
  • Built a logistics management app using React Admin and Node.js microservices within an Nx monorepo.
  • Implemented Google Cloud Functions v2 (HTTP, Pub/Sub, Scheduler) for event-driven and background workflows.
  • Integrated Firebase Firestore for real-time operations and maintained MongoDB for legacy data compatibility.
  • Utilized Pub/Sub and message queues for asynchronous event handling and system decoupling.
  • Connected ERP and e-commerce systems (e.g., Shopify, Pipe17) via REST APIs and webhooks for centralized order tracking.
  • Enabled client-specific workflows using custom triggers and low-code tools like Pipedream.
  • Deployed Cloudflare Workers and KV storage for low-latency edge computing.
  • Applied CI/CD, modular monorepo, and cloud-native best practices for scalable, secure development.
  • Delivered a multi-tenant logistics portal supporting real-time shipment tracking and third-party integrations.
Project Tech stack:
React
Node.js
Firebase
Cloud Firestore
GCP
MongoDB
Cloud development
Typescript
Full-stack Developer
Dec 2022 - Nov 202310 months
Project Overview

It's a social media automation tool that allows users to compose, schedule, and post content across various platforms. It integrates AI to generate and enhance social media posts.

Responsibilities:
  • Built a full-stack social media automation tool using Next.js and Nest.js.
  • Integrated OpenAI APIs with prompt engineering to auto-generate and enhance post content, boosting quality and efficiency.
  • Developed a custom scheduling engine for time-based and platform-specific publishing.
  • Implemented AI-powered image generation and a visual preview tool simulating post layouts for each platform.
  • Integrated YouTube Data API and transcription services to create interactive, ChatGPT-style video Q&A features.
  • Delivered a seamless UX with real-time previews, autosave, and multi-step content workflows for creators and marketers.
Project Tech stack:
Next.js
Nest.js
OpenAI API
React
Tailwind CSS
Full-stack Developer
Apr 2022 - Apr 20231 year
Project Overview

It's an EHR platform designed to streamline patient care, treatment planning, and clinical workflows for oncology practices.

Responsibilities:
  • Engineered modular .NET microservices for oncology workflows following SOLID principles and DDD.
  • Designed and maintained SQL Server, PostgreSQL, and CosmosDB schemas for patient records, treatment plans, and clinical trials.
  • Migrated legacy SOAP integrations to RESTful APIs with versioned Swagger documentation.
  • Developed role-based ASP.NET MVC interfaces for clinical operations.
  • Built responsive, secure web portals using React, Bootstrap, and Ant Design, ensuring HIPAA compliance.
  • Initiated AI-assisted data cleaning with Gemini Flash to digitize handwritten oncology forms, improving accuracy.
  • Collaborated with UI/UX teams on dashboards with D3.js and AmCharts for real-time insights.
  • Mentored junior developers, documented reusable .NET patterns, and led refactoring sprints, improving code quality and onboarding.
Project Tech stack:
React
Node.js
MongoDB
Express.js

Education

2013
Computer Engineering
Bachelor's Degree

Languages

English
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