Senior Full Stack Developer, AI

Job not on LinkedIn

🕒 July 27

🇪🇸 Spain – Remote

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 24%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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LEADtech

WebsiteLinkedInAll Job Openings

2 - 10 employees

Founded 2017

🛍️ eCommerce

🛒 Retail

🔧 Hardware

eCommerce • Retail • Hardware

LEADtech is an online Romanian retailer and e‑commerce store that offers a broad catalogue of consumer electronics, IT and computer components, mobile phones, home electronics, gaming gear, appliances, tools, garden equipment, baby products and smart home/security devices. The site content (Romanian language, references to "lei" and sections like "Contul Meu") indicates a web storefront selling products from stock with delivery, account/returns support, and extensive category-based merchandising for consumers and small businesses.

📋 Description

• Building and scaling platforms and products • Working across the A.I technology stack to deliver a seamless user experience • Joining projects with a shipping fast approach and a modern tech stack • Designing, implementing, and maintaining RESTful APIs with NextJS/Express • Modeling Context Protocol (MCP) Knowledge Agents with Claude SDK • Creating AI Agents that can take actions and handle multi-step reasoning • Developing and maintaining features on both React frontend and Node.js (NextJS) backend • Building intuitive user interfaces using TypeScript, Vite, React and a UI component library • Integrating the platform with various external services • Collaborating closely with AI product managers and specialists • Contributing to database schema design and writing migrations • Collaborating on application deployment and maintaining cloud infrastructure

🎯 Requirements

• Extensive experience with the Python framework • Deep API Integration experience with 3rd Party vendors • Ability to work with multiple types of SDK to integrate into products quickly • Highly proficient in TypeScript and its application in both frontend (React) and backend (Node.js) environments • Strong experience with React and modern state management, including Hooks and the Context API • Solid experience building and consuming REST APIs with Node.js and NextJS or Express • Experience with databases like PostgreSQL, and working with an ORM or query builder • Knowledge of LangGraph, LangChain, LangFuse • Collaborative problem-solver, eager to take on new challenges • Genuine passion and awareness for artificial intelligence

🏖️ Benefits

• Competitive salary • Full-time permanent contract • Top-tier private health insurance (including dental and psychological services) • 25 days of vacation plus your birthday off, with flexible vacation options—no blackout days! • Flexible schedule with flextime and the option of working full remote or from our Barcelona office • Free Friday afternoons with a 7-hour workday • 35-hour workweek in July and August so you can savor summer! • Internal training and an annual budget for external learning opportunities • Ticket restaurant and nursery vouchers, paid directly from your gross salary