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Sr. Full-Stack Software Engineer

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Job details

Pay

$50–$100 USD/hr

equivalent, paid per accepted task

Engagement

Contract, part-time

Location

Remote

52 countries

Posted

Nov 11, 2026

OpenTrain on Trustpilot

The work

You will contribute to AI training through software development, technical problem-solving, system architecture, debugging, and code evaluation. The work covers both front-end and back-end systems, including user-facing features, services, APIs, data models, and external integrations.

You will also create and solve challenging engineering tasks, translate complete coding builds between programming languages, and assess AI-generated solutions against standards for correctness, completeness, performance, security, and maintainability.

  • Develop, modify, and debug front-end and back-end application components.
  • Build user-facing features with supporting services, APIs, and data models.
  • Trace requests and data across browsers, applications, APIs, services, databases, and external integrations.
  • Work in unfamiliar repositories and understand existing application architecture.
  • Diagnose issues involving application state, API contracts, authentication, persistence, networking, and deployment.
  • Evaluate and improve code written in multiple programming languages.
  • Review and validate challenging software-engineering tasks and AI-generated solutions.

Requirements

This is part-time contractor work for an AI training and software evaluation project.

  • Time: Less than 20 hours per week.
  • Language: Fluent in English.
  • Strong professional experience developing production full-stack applications.
  • Hands-on experience across 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 complete software-system architecture.
  • Ability to work effectively in unfamiliar codebases.
  • Strong debugging and technical problem-solving skills.
  • Experience: Mid-Senior level
  • Skills: Python, React, JavaScript, JAVA, Node.js, Rust, GoLang, Typescript

Open to applicants in

  • Algeria
  • Argentina
  • Austria
  • Bahrain
  • Bangladesh
  • Belgium
  • Brazil
  • Canada
  • Chile
  • Colombia
  • Denmark
  • Egypt
  • France
  • Germany
  • Ghana
  • Greece
  • India
  • Indonesia
  • Italy
  • Japan
  • Jordan
  • Kazakhstan
  • Kenya
  • Kuwait
  • Kyrgyzstan
  • Lebanon
  • Malaysia
  • Mexico
  • Morocco
  • Netherlands
  • Nigeria
  • Oman
  • Pakistan
  • Palestine
  • Peru
  • Philippines
  • Portugal
  • Qatar
  • Saudi Arabia
  • Singapore
  • South Africa
  • Spain
  • Sri Lanka
  • Switzerland
  • Taiwan
  • Thailand
  • Tunisia
  • United Arab Emirates
  • United Kingdom
  • United States
  • Uzbekistan
  • Vietnam

How to apply

  1. Press Apply now. You create a free OpenTrain account and add your resume.
  2. Finish your application on the hiring company's site. The company decides who it hires, so it runs its own form. It asks for your resume again, your LinkedIn profile, your phone number, your location and answers to 5 screening questions.
  3. Take a short AI interview with a coding challenge.

Job ID: cmwbkeffv001w08ld3kc48ybj

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