Senior Software Engineer; Node.js + React.js Job Romania Pennsylvania USA,Software Development

Position: Senior Software Engineer (Node.js + React.js)
Location: Romania

Project Overview

On behalf of our client — a global organization providing scientific, medical, and analytics information platforms — we are hiring Senior Software Engineers (Node.js & React.js) to build scalable backend services powering an AI‑driven research tool used by scientists, clinicians, and analysts worldwide. This position is available only for candidates currently residing in Romania.

Role Overview

This is a backend‑focused engineering role, with occasional frontend contributions. You will design and implement scalable services, APIs, and integrations, ensuring reliability, performance, and clean engineering practices.

We’re looking for senior engineers with 8+ years of experience, strong Node.js expertise, a solid understanding of algorithms and system design, and hands‑on experience building production‑grade systems.

Contract & Working Model

Flexible collaboration model: employment (CIM) or B2B
Location:

Romania — remote or hybrid from Cluj / Iași

Responsibilities

Build and maintain backend services and APIs
Design and implement REST and/or Graph

QL APIs
Develop business logic and system integrations
Ensure scalability, reliability, and performance of backend components
Collaborate with frontend teams to support end‑to‑end delivery
Write clean, testable, maintainable code
Participate in system design, architecture discussions, and Agile ceremonies

Requirements

8+ years of professional software engineering experience
Bachelor’s degree in Computer Science, Engineering, or equivalent
Strong foundation in algorithms, data structures, and core programming concepts
Strong expertise in Node.js
Proficiency with Type Script / modern Java Script
Experience designing RESTful APIs and/or Graph

QL APIs
Data modeling experience (SQL / No

SQL)
Understanding of authentication and authorization concepts
Experience working with production‑grade systems
Knowledge of scalability, reliability, and performance best practices
Experience with unit and integration testing
Familiarity with Git and Agile workflows
Experience with observability (logging, monitoring, tracing)
Exposure to distributed systems
Awareness of frontend systems (React, API consumption patterns)
Experience with CI/CD pipelines and Dev Ops workflows
Exposure to AI / LLM integrations

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