Senior Software Engineer - Web App & Devex

Runware; Marbella; Remote; EUR 69,000 - 110,000; Full time

Job summary

Runware is seeking an experienced Sr. Full-Stack Software Engineer for a fully remote, contract-based position (~15 hours/week). You will tackle AI training tasks, code evaluation, and problem solving across front-end and back-end systems.

You'll work with Python, React, JavaScript, and other languages, building APIs, data models, and debugging across unfamiliar codebases while ensuring security and performance.

Qualifications

• Proficient in Python, React, JavaScript/TypeScript and at least one back-end language.
• Experience building APIs, data models and scalable architectures.

Responsibilities

• Develop and debug front-end and back-end applications.
• Build features, APIs, services, and data models.
• Understand and work across unfamiliar codebases.

Skills

Python

React

JavaScript

Java

Node.js

Rust

Go

TypeScript

Full-stack development

APIs and databases

Job description

Sr. Full-Stack Software Engineer - Remote

Full-Stack Software Engineer

Location: Global, Fully Remote
Job Type: Contractor | ~15 hours/week
Schedule: Flexible

We're looking for experienced Full-Stack Software Engineers to support an AI training project focused on software development, debugging, code evaluation, and technical problem-solving.

Key Responsibilities

• Develop and debug front-end and back-end applications.
• Build features, APIs, services, and data models.
• Understand and work across unfamiliar codebases.
• Troubleshoot application, API, database, and integration issues.
• Review and evaluate AI-generated code for correctness, security, performance, and maintainability.
• Translate and adapt software builds between programming languages.

Required Skills

• Python
• React
• JavaScript
• Java
• Node.js
• Rust
• Go
• TypeScript
• Strong full-stack development experience
• Experience with APIs, databases, application architecture, and debugging