Antoniu – Typescript, React, Node.js, experts in Lemon.io

Antoniu

From Romania (UTC+3)flag

Full-stack Web Developer|Strong senior

Antoniu – Typescript, React, Node.js

Antoniu is a strong senior full-stack engineer with 6 years of experience in TypeScript, Node.js, and React, and practical knowledge of AWS and GCP. During the pre-vetting, he demonstrated solid backend and frontend skills, including Express.js, Fastify, PostgreSQL, MongoDB, and micro-frontend integration. Screening results suggest clear communication, a customer-oriented mindset, and strong problem-solving abilities!

6 years of commercial experience in
Administration
Adtech
Advertising
AI
Marketing
Content management
Main technologies
Typescript
6 years
React
6 years
Node.js
6 years
AWS
3 years
Additional skills
Next.js
Remix
Direct hire
Possible
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Experience Highlights

Senior Full-stack Engineer
Mar 2025 - Ongoing1 year 5 months
Project Overview

A platform where marketers can create ad-ready content following strict brand guidelines and publish it on multiple advertising platforms (Meta, TikTok, Google Ads, LinkedIn, etc)

Responsibilities:
  • Designed and shipped an AI agentic system using Mastra (LLM orchestration) that analyzes user data and competitor PPC campaigns to recommend custom ad creatives for paid platforms.
  • Developed publishing pipelines integrating with Meta, Google, LinkedIn, TikTok, and Amazon ad platforms, including platform-specific creative validation and pre-submission rule enforcement.
Project Tech stack:
React
Typescript
Express.js
Fastify.js
Datadog
Claude Code
Redis
AI agent development
RAG
Vector Databases
AWS
WebSocket
PostgreSQL
GitHub Actions
Docker
Monorepo
Solo Developer
Nov 2024 - Oct 202511 months
Project Overview

An AI-powered platform for recommending gifts.

Responsibilities:
  • olo developed an AI-enhanced recommendation platform that was giving gift suggestions based on a set of details about the giftee
  • Hosted the app on a VPS and managed it through Plesk (which also provided continuous deployment)
  • Used ChromaDB for vector storing of the gifts, NextJS v15 for Frontend, Flask for Backend, Grafana for Observability
  • Used Claude agents + playwright for automated scraping of websites
Project Tech stack:
Flask
React
Next.js
Vector Databases
RAG
AI
Grafana
GCP Compute Engine
Senior Frontend Developer
Oct 2024 - Apr 20255 months
Project Overview

In the early era of AI, the Create module was designed to provide an AI-first interface that would let the platform's users generate images from text, similar images, and strict brand guidelines.

Responsibilities:
  • Created a new and totally untested feature and a testing plan for the existing create module feature, both unit testing (Jest) and e2e testing (Playwright)
  • Provided the initial set-up for the testing environments and settled on the patterns of testing and code standards, and led the initiatives until a high coverage/confidence number was reached
  • Developed draft functionality using Jotai for state management
  • Delivered under critical time, the ability to create images based on a given set of reference images
  • Put the foundations of the first MVP with a first version of 4 generated images based on text and guidelines
  • Built a predictive prompt-recommendation feature on top of the agentic pipeline, reducing user abandonment in the creative-creation flow by ~30%. Used Mastra AI, Vector Databases, and RAG
Project Tech stack:
React
Redux
Monorepo
Front-end developer
Jun 2021 - Oct 20243 years 4 months
Project Overview

An enterprise platform used to create, manage, and deliver digital content, websites, mobile apps, and user experiences across multiple channels. It is acting as both a DAM and a CMS.

Responsibilities:
  • Led a major frontend refactor that made the codebase reusable across resource types, cutting new micro-frontend (MFE) delivery from months to ~3 sprints. Worked with React, TypeScript, Adobe Spectrum, Redux, Redux-Saga, Monorepo environment, Lerna
  • Developed features such as async polling of tasks, unified error handling, retry logic mechanisms, content editing, displaying paginated content in an infinite scroll view, filtering
  • Developed the contextual search through content resources capability using RAG [Hackathon]
  • Integrated other internal frontend applications and managed communication between micro-frontends through custom events.
Project Tech stack:
React
Redux Saga
Redux
Monorepo
Lerna
Typescript

Education

2021
Computer Science
Bachelor's
2023
Computer Science
Master's

Languages

Romanian
Advanced
Spanish
Intermediate
German
Pre-intermediate
English
Advanced

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