Remote | Sr. Full-Stack Software Engineer — $50–$100/hour at 24-MAG in New York, New York, United States

Job description

• We are sharing a specialised consulting opportunity for experienced Full-Stack Software Engineers with strong expertise across front-end and back-end development, application architecture, debugging, APIs, databases, service integration, and multi-language software engineering to contribute to an advanced AI training and software-evaluation project.
• Selected professionals will create, solve, review, and validate challenging software-engineering tasks across complete application stacks. The work requires hands-on experience across both front-end and back-end systems, strong debugging skills, and the ability to navigate unfamiliar repositories and evaluate code for correctness, performance, security, and maintainability.

Responsibilities

• Full-Stack Development & Integration
• Develop and modify front-end and back-end application components
• Build user-facing features, APIs, services, and supporting data models
• Work across browser applications, databases, external integrations, and service layers
• Manage application state, authentication, persistence, and client-server interactions
• Implement changes that fit existing architecture and coding conventions
• Debugging & Architecture
• Diagnose failures involving application state, APIs, networking, authentication, databases, and deployment
• Trace requests and data across system boundaries to identify root causes
• Work effectively within unfamiliar repositories and understand existing architecture
• Evaluate architectural fit, system dependencies, and implementation trade-offs
• Develop technically sound and maintainable fixes
• Multi-Language Engineering & Testing
• Review and modify code across Python, JavaScript, TypeScript, Java, Node.js, Rust, Go, or comparable technologies
• Translate software implementations between languages where required
• Preserve intended behaviour and architectural constraints
• Develop or review unit, integration, regression, and end-to-end tests
• Validate fixes and identify missing test coverage
• AI-Generated Code Evaluation
• Review AI-generated solutions for correctness, completeness, performance, security, and maintainability
• Identify implementation or architectural weaknesses
• Assess whether solutions fit repository conventions
• Provide structured technical feedback
• Document important engineering decisions and findings clearly

Requirements

• Strong professional experience developing production full-stack applications
• Meaningful hands-on experience with both front-end and back-end engineering
• Production experience with multiple programming languages
• Strong knowledge of browser applications, APIs, databases, application state, and service integration
• Experience contributing to complete software-system architecture
• Ability to work effectively in unfamiliar codebases
• Strong debugging and technical problem-solving skills
• Experience with Python, JavaScript, TypeScript, Java, Node.js, Rust, Go, or comparable languages
• React experience is valuable
• Ability to evaluate code for correctness, security, performance, and maintainability
• Experience translating implementations between programming languages is advantageous
• No prior AI-training or model-evaluation experience is required

Skills

Required

• Full-stack development
• Front-end development
• Back-end development
• Application architecture
• Debugging
• APIs
• Databases
• Service integration
• Multi-language software engineering
• Python
• JavaScript
• TypeScript

Preferred

• React