Senior Full Stack Engineer (Remote-Worldwide)

Join; United States; Remote; USD 41,000 - 69,000; Part time

Job summary

Join is seeking highly skilled Full-Stack Software Engineers to contribute to an AI training project, spanning front-end and back-end development, debugging, and system architecture. Remote, contractor role (~15 hours per week) with flexible schedule and self-directed work, including weekends if desired with activity.

You'll translate and evaluate code across languages, review AI-generated solutions for correctness, performance, and security, and collaborate across unfamiliar repositories to

Qualifications

• Production experience building full-stack applications across front-end and back-end.
• Hands-on experience with multiple programming languages.
• Ability to work in unfamiliar codebases and debug complex systems.
• Experience understanding and contributing to the architecture of complete software systems.
• Strong debugging and technical problem-solving skills.

Responsibilities

• Develop, modify, and debug front-end and back-end application components.
• Implement user-facing features and the services, APIs, and data models that support them.
• Trace requests and data across browsers, front-end applications, APIs, services, databases, and external integrations.
• Work inside unfamiliar repositories and understand existing application architecture.
• Diagnose failures involving application state, API contracts, authentication, persistence, networking, and deployment.
• Evaluate and improve code written in multiple programming languages.
• Review AI-generated solutions for correctness, completeness, performance, security, and maintainability.

Skills

Full-stack development

Front-end engineering

Back-end engineering

Debugging and problem solving

API integration

Job description

Tasks

Location: Global, fully remote

Job Type: Contractor (~15 hours per week)

Schedule: Flexible—you choose the hours and days you work, including weekends if desired as long as there is activity.

We are looking for highly skilled Full-Stack Software Engineers to contribute to an AI training project involving software development, technical problem-solving, debugging, system architecture, and code evaluation.

The work involves creating, solving, reviewing, and validating challenging software-engineering tasks across front-end and back-end systems and helping with translating full coding builds from one particular language into another.

This role requires meaningful hands-on experience across both front-end and back-end engineering. Candidates should be comfortable working throughout the application stack rather than specializing exclusively in one layer.

What You’ll Work On

1. Develop, modify, and debug front-end and back-end application components.
2. Implement user-facing features and the services, APIs, and data models that support them.
3. Trace requests and data across browsers, front-end applications, APIs, services, databases, and external integrations.
4. Work inside unfamiliar repositories and understand existing application architecture.
5. Diagnose failures involving application state, API contracts, authentication, persistence, networking, and deployment.
6. Evaluate and improve code written in multiple programming languages.
7. Review AI-generated solutions for correctness, completeness, performance, security, and maintainability.

Requirements

Required Qualifications

1. Strong professional experience developing production full-stack applications.
2. Meaningful hands-on experience with both front-end and back-end engineering.
3. Production experience with multiple programming languages.
4. Strong knowledge of browser applications, APIs, application state, databases, and service integration.
5. Experience understanding and contributing to the architecture of complete software systems.
6. Ability to work effectively in unfamiliar codebases.
7. Strong debugging and technical problem-solving skills.