Senior Full Stack Engineer (Remote | $50-$100/hr)

Synthires
Spain
2 days ago
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Role details

Contract type
Contract
Employment type
Part-time (≤ 32 hours)
Compensation
€104,000
Working hours
Regular working hours

Tech stack

Application Programming Interfaces (APIs) Artificial Intelligence Applications Architecture Component-Based Software Engineering User Authentication Code Generation Software Quality Persistent Data Structure Database Design Software Debugging Identity and Access Management Software Engineering
+9 more
Software Systems Systems Architecture Backend Codebase Front End Software Development Api Design Api Management Service Stack Programming Languages

Job description

Position: Senior Full-Stack Software Engineer

Type: Contractor

Compensation: $50-$100 per hour equivalent (paid per accepted task)

Location: Fully Remote (Worldwide)

About the Opportunity

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

In this role, you will create, solve, review, and validate challenging software engineering tasks across front-end and back-end systems. You will also work on translating complete coding projects from one programming language to another.

This position requires substantial hands-on experience across the full application stack. Candidates should be comfortable developing and debugging both user-facing applications and the backend services that support them, rather than specializing exclusively in one layer.

Key Responsibilities

  • Develop, modify, and debug front-end and back-end application components.
  • Implement user-facing features alongside the services, APIs, and data models that support them.
  • Navigate unfamiliar code repositories and understand existing application architecture.
  • Diagnose and resolve issues involving application state, API contracts, authentication, data persistence, networking, and deployment.
  • Evaluate, improve, and translate code across multiple programming languages.
  • Review AI-generated solutions for correctness, completeness, performance, security, and maintainability.
  • Create and validate technically challenging software engineering tasks for AI training and evaluation.
  • Provide clear technical feedback on implementation quality, debugging approaches, and system design.

Required Qualifications

  • Meaningful hands-on experience in both front-end and back-end engineering.
  • Experience understanding and contributing to the architecture of complete software systems.
  • Ability to navigate and work effectively in unfamiliar codebases.
  • Strong debugging, analytical, and technical problem-solving skills.

Preferred Qualifications

  • Experience working across diverse technology stacks and programming languages.
  • Familiarity with modern front-end frameworks, backend architectures, and API development.
  • Experience with database design, authentication systems, networking, and external service integrations.
  • Ability to assess code quality, performance, security, and maintainability.
  • Experience reviewing AI-generated code or contributing to software engineering evaluation projects.

Compensation & Engagement

  • Compensation: $50-$100 per hour equivalent, paid per accepted task.
  • Work Arrangement: Fully remote, worldwide.
  • Time Commitment: Approximately 15 hours per week.
  • Weekly Requirement: A minimum number of tasks must be submitted each week.

Requirements

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

In this role, you will create, solve, review, and validate challenging software engineering tasks across front-end and back-end systems. You will also work on translating complete coding projects from one programming language to another.

This position requires substantial hands-on experience across the full application stack. Candidates should be comfortable developing and debugging both user-facing applications and the backend services that support them, rather than specializing exclusively in one layer., * Meaningful hands-on experience in both front-end and back-end engineering.

  • Experience understanding and contributing to the architecture of complete software systems.
  • Ability to navigate and work effectively in unfamiliar codebases.
  • Strong debugging, analytical, and technical problem-solving skills., * Experience working across diverse technology stacks and programming languages.
  • Familiarity with modern front-end frameworks, backend architectures, and API development.
  • Experience with database design, authentication systems, networking, and external service integrations.
  • Ability to assess code quality, performance, security, and maintainability.
  • Experience reviewing AI-generated code or contributing to software engineering evaluation projects.

Compensation & Engagement

Benefits & conditions

  • Compensation: $50-$100 per hour equivalent, paid per accepted task.
  • Work Arrangement: Fully remote, worldwide.
  • Time Commitment: Approximately 15 hours per week.
  • Weekly Requirement: A minimum number of tasks must be submitted each week.

Apply for this position

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