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Hiring now · posted 2d ago Tech Contract · Remote

Sr. Full-Stack Software Engineer

$50–$100/hr

Published pay. The final rate depends on your test, experience and country.

Remote · Worldwide 300 openings Language: English Posted 11 Nov 2026

Sr. Full-Stack Software Engineer is remote AI-training work for developers, paying $50–$100/hr, open to applicants worldwide. Posted 11 Nov 2026, still open on 13 Nov 2026. Zekai lists it for free; the application goes to the employer's platform.

About this role

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Full-Stack Software Engineer

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

  • 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.

Required Qualifications

  • 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, application state, databases, and service integration.
  • Experience understanding and contributing to the architecture of complete software systems.
  • Ability to work effectively in unfamiliar codebases.
  • Strong debugging and technical problem-solving skills.

Process

  • Apply to the role and complete the screening questions.
  • Complete an AI interview of approximately 30 minutes.
  • Complete a technical assessment, if required.
  • Complete the hiring manager review.

Compensation Structure

Compensation is output-based. Experts are paid per task that meets the project specifications. The time required to complete each task may vary depending on the expert’s experience and workflow.

Minimum submission requirements apply. Experts must submit a minimum number of tasks per week.

Start Timeline & Availability

  • We typically fill roles within 48 hours and are looking for experts who are ready to begin immediately. If selected, you will be expected to start your first tasks within 24–48 hours of completing onboarding.

This is a 100% remote contract role, open to applicants worldwide in the countries the employer accepts.

PythonReactJavaScriptJAVANode.jsRustGoLangTypescript

How applying works

  1. Click Apply now and enter your email.
  2. You go straight to the application. We email you a copy of this role and your link.
  3. Most platforms ask for a CV and a short skills test or AI interview in your field.
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What to know before you apply

Pay
At the published rate, 10 hours a week would be about $500–$1,000 and 20 hours about $1,000–$2,000 before tax. Hours depend on the project, so treat this as a ceiling, not a promise.
Openings
300 openings means this is a high-volume project. You are not competing for one seat: if you pass the test, there is room for you.
Location
Open worldwide in the countries the employer accepts. Payments usually go out through services like PayPal or Wise, so check one of them works in your country.
Timing
This listing is 2 days old. Projects can close once they have enough people, so it is worth applying while it is open.
Test tips for developers
  • Run the code in your head (or for real) before judging it: correctness beats style.
  • Write the smallest failing test that proves a bug.
  • Explain fixes in two or three clear sentences. Written clarity is graded too.
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